阅读说明：本技术 一种高强度耐腐蚀钢筋焊接方法 (High-strength corrosion-resistant steel bar welding method ) 是由 王光文 唐名标 林军 林致明 于 2020-10-26 设计创作，主要内容包括：本发明涉及一种高强度耐腐蚀钢筋焊接方法,包括打磨待焊接钢筋端面以使端面平整,将待焊接的两根钢筋待焊接端放入压接器,根据钢筋直径进行预压调整两端面之间距离；对两根钢筋焊接端进行加热,在经过测温间隔时间后,温度传感器检测两根钢筋焊接端的温度；两根钢筋焊接端的温度达到压接要求后,压接器对两根钢筋待焊接端进行加压以使焊接端面粘合；在确认两钢筋的缝隙完全粘合后,改用中性焰加热,达到加压要求后对两根钢筋焊接端进行第三次加压,当接缝处出现满足连接要求形变后停止加热；运用风冷冷却接缝处直至温度降到安全范围。本发明通过预设矩阵与计算方法确定压接过程中各设备运行状态,提升了焊接方法成功率。(The invention relates to a high-strength corrosion-resistant steel bar welding method, which comprises the steps of polishing the end faces of steel bars to be welded to enable the end faces to be smooth, putting the ends to be welded of the two steel bars to be welded into a crimping device, and prepressing according to the diameter of the steel bars to adjust the distance between the two end faces; heating the welding ends of the two steel bars, and detecting the temperature of the welding ends of the two steel bars by a temperature sensor after a temperature measurement interval; after the temperature of the welding ends of the two steel bars reaches the crimping requirement, the crimper pressurizes the ends to be welded of the two steel bars so as to bond the welding end surfaces; after the gaps of the two steel bars are confirmed to be completely bonded, heating by using neutral flame, pressurizing the welding ends of the two steel bars for the third time after the pressurizing requirement is met, and stopping heating after deformation meeting the connecting requirement appears at the joint; and cooling the joint by air cooling until the temperature is reduced to a safe range. The invention determines the running state of each device in the crimping process through the preset matrix and the calculation method, thereby improving the success rate of the welding method.)

1. A high-strength corrosion-resistant steel bar welding method is characterized by comprising the following steps:

polishing the end face of a steel bar to be welded to enable the end face to be flat, chamfering the edge of the end face by 45 degrees and determining the chamfering amount according to the diameter of the steel bar;

secondly, respectively putting the ends to be welded of the two steel bars to be welded into a crimping device, clamping each welding end by the crimping device, aligning the end faces of the two steel bars, and prepressing according to the diameter of the steel bars to adjust the distance between the two end faces;

preheating the welding ends of the two steel bars to be welded, and determining the air injection pressure of the injection type heater during formal heating according to the heating condition of the preheated steel bars;

regulating the jet pressure of the jet-suction type heater to the value determined in the step three so as to formally heat the welding ends of the two steel bars, and detecting the temperature of the welding ends of the two steel bars by a temperature sensor after a temperature measurement interval;

after the temperature of the welding ends of the two steel bars reaches the crimping requirement, the crimper pressurizes the ends to be welded of the two steel bars for the second time so that the welding end surfaces are bonded to form a welding surface;

after the gaps of the two steel bars are completely bonded, the jet-suction type heater uses neutral flame instead and uniformly swings in the specified range of the welding pressure surface to reversely heat the two welded steel bars, and the swing amplitude of the jet-suction type heater is twice of the diameter and the length of the steel bars;

seventhly, when foam formed by aggregation of grey-white balls appears in the heating range and moves along with the heating swing direction, the welding ends of the two steel bars are pressurized for the third time, and when the diameter of the raised part is 1.4-1.5 times of the diameter of the steel bars and the axial length of the raised part is 1.3-1.4 times of the diameter of the steel bars, the injection-suction type heater stops heating;

step eight, detecting the temperature of the steel bar welding position by a temperature detector after the self-cooling detection time so as to determine the air cooling wind speed;

step nine, after the temperature of the welding position of the steel bar is reduced to a safe range, closing the air cooling machine and removing a fixture on the crimping device to complete welding of the steel bar to be welded;

the method comprises the steps of arranging a steel bar to be welded with a steel bar matrix E0(E1, E2, E3, E4) and a heating steel bar parameter matrix F0(F1, F2, F3, F4), calculating the temperature T required by crimping the steel bar according to the steel bar material E and the diameter R, arranging a steel bar crimping temperature matrix T0(T1, T2, T3, T4), an injection pressure matrix M0(M1, M2, M3, M4), a preheating temperature difference matrix T0(T1, T2, T3, T4) and an injection amount compensation parameter matrix alpha 0 (alpha 1, alpha 2, alpha 3, alpha 4), determining the injection pressure Mi of a heater, i is 1,2,3,4 according to the temperature T, calculating the standard temperature value of the injection pressure Mit of the welding end face heating for detecting P according to the injection pressure Mi, adjusting the injection pressure Mit to be Mi, igniting the heater and aligning the injection port of the flame to a gap to be heated, when the temperature detection duration P passes, the temperature sensor detects the end face temperature t ', calculates the absolute value delta t of t' and t, compares the delta t with the internal parameter of t0, adjusts the heater spraying pressure according to the comparison result, determines the crimping temperature and the heater spraying pressure through a preset matrix and a calculation method, and adjusts the welding process.

2. The high strength corrosion-resistant steel bar welding method according to claim 1, wherein for the pre-heating temperature difference matrix t0, t0(t1, t2, t3, t4), wherein t1 is a first pre-set heating temperature difference, t2 is a second pre-set heating temperature difference, t3 is a third pre-set heating temperature difference, and t4 is a fourth pre-set heating temperature difference; for the air injection quantity compensation parameter matrix alpha 0, alpha 0 (alpha 1, alpha 2, alpha 3), wherein alpha 1 is a first preset air injection quantity compensation parameter, alpha 2 is a second preset air injection quantity compensation parameter, and alpha 3 is a third preset air injection quantity compensation parameter;

when the jet pressure value of the jet-suction type heater is set to Mi and the jet-suction type heater ignites the jet orifice, i is 1,2,3 and 4, the jet-suction type heater aims the jetted flame at a gap between two end surfaces to be welded for heating, when the temperature detection duration P is passed, the temperature sensor detects the temperature t of the end surfaces, calculates the absolute value delta t of the difference between t' and t, and compares the delta t with internal parameters of t 0:

when the delta t is less than or equal to t1, the jet pressure of the heater is not adjusted;

when t is more than t1 and is less than or equal to t2, selecting alpha 1 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' ═ Mi-Mi multiplied by alpha 1, and when t is less than t, Mi ' ═ Mi + Mi multiplied by alpha 1;

when t is more than t2 and is less than or equal to t3, selecting alpha 2 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' -Mi x alpha 2, and when t is less than t, Mi ' -Mi + Mi x alpha 2;

when t is more than t3 and is less than or equal to t4, selecting alpha 3 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' -Mi x alpha 3, and when t is less than t, Mi ' -Mi + Mi x alpha 3;

after the jet pressure of the heater is adjusted, flame sprayed by the heater is aligned to a gap between two end faces to be welded for heating, temperature detection is carried out on the end faces once every detection time length P, and the pressure welding device carries out secondary pressurization on the ends to be welded of the two reinforcing steel bars so as to bond the end faces until the detected end face temperature T' is greater than the temperature T required by pressure welding.

3. The welding method of high strength and corrosion resistant steel bars according to claim 1, wherein when pre-pressing the steel bars, an end distance parameter matrix D0(D1, D2, D3, D4) is established, wherein D1 is a first preset end distance parameter, D2 is a second preset end distance parameter, D3 is a third preset end distance parameter, D4 is a fourth preset end distance parameter, the distance parameters are sequentially decreased; when the reinforcing steel bar is pre-pressed, calculating the distance between the end surfaces of the two reinforcing steel bars to be welded according to the comparison result of the diameter R of the reinforcing steel bar to be welded and the internal parameters of the matrix R0:

when R is not more than R1, D1 is selected from the matrix D0 to calculate the end face distance L:

L＝R×D1

when R1 < R ≦ R2, D1 and D2 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R-R1)×D2

when R2 < R ≦ R3, D1, D2, and D3 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R2-R1)×D2+(R-R2)×D3

when R2 < R ≦ R3, D1, D2, D3, and D4 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R2-R1)×D2+(R3-R2)×D3+(R-R3)×D4

and after the calculation is finished, prepressing by the crimping device to adjust the distance between the two end faces of the steel bar to be welded to be L.

4. The welding method of the high-strength corrosion-resistant steel bars according to claim 1, wherein before the steel bars to be welded are pressurized for the second time, a steel bar material matrix E0, a steel bar crimping temperature matrix T0, an injection-suction type heater air injection pressure matrix M0 and a heating steel bar material parameter matrix F0 are respectively established; for the steel bar material matrixes E0, E0(E1, E2, E3, E4), wherein E1 is a first preset steel bar material, E2 is a second preset steel bar material, E3 is a third preset steel bar material, and E4 is a fourth preset steel bar material; for the heating steel bar material parameter matrixes F0, F0(F1, F2, F3, F4), wherein F1 is a first preset steel bar material parameter, F2 is a second preset steel bar material parameter, F3 is a third preset steel bar material parameter, and F4 is a fourth preset steel bar material parameter; for the steel bar crimping temperature matrix T0, T0(T1, T2, T3, T4), where T1 is a first preset crimping temperature, T2 is a second preset crimping temperature, T3 is a third preset crimping temperature, and T4 is a fourth preset crimping temperature; for the jet-suction type heater air injection pressure matrixes M0, M0(M1, M2, M3, M4), wherein M1 is a first preset heater air injection pressure, M2 is a second preset heater air injection pressure, M3 is a third preset heater air injection pressure, and M4 is a fourth preset heater air injection pressure;

comparing the material E of the steel bar with the internal parameters of the matrix E0:

when the material E is judged to be the material E1, selecting F1 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E2, selecting F2 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E3, selecting F3 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E4, selecting F4 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material of the steel bar is Ei, i is 1,2,3 and 4, the material parameter of the steel bar is Fi, the temperature T required by the compression joint of the steel bar is calculated,wherein R is the diameter of the steel bar, and R is a compensation parameter of the diameter R of the steel bar to the crimping temperature T of the steel bar;

before the reinforcing steel bar to be welded is pressurized for the second time, the temperature T required by the reinforcing steel bar in crimping is compared with the internal parameters of T0:

when T is less than or equal to T1, selecting M1 from the matrix M0 as the pressure of the heater;

when T is more than T1 and less than or equal to T2, selecting M2 from the matrix M0 as the pressure of the heater;

when T is more than T2 and less than or equal to T3, selecting M3 from the matrix M0 as the pressure of the heater;

when T is more than T3 and less than or equal to T4, selecting M4 from the matrix M0 as the pressure of the heater;

when Mi is selected as the heater to spray air pressure, the end surface to be welded is heated by a standard temperature value t with a detection time length P,wherein k is a compensation parameter of the standard temperature value t.

5. The welding method of high strength corrosion resistant steel bars according to claim 1, wherein when pre-pressing the steel bars, a matrix of a mold a0 and a matrix of a diameter of the steel bars R0 are established; for the steel bar diameter matrixes R0 and R0(R1, R2, R3 and R4), wherein R1 is the diameter of a first preset steel bar, R2 is the diameter of a second preset steel bar, R3 is the diameter of a third preset steel bar, R4 is the diameter of a fourth preset steel bar, and the numerical values of the diameters are sequentially increased; for the mold matrix a0, a0(a1, a2, A3, a4), where a1 is a first preset mold, a2 is a second preset mold, A3 is a third preset mold, and a4 is a fourth preset mold;

when the reinforcing steel bar is pre-pressed, the diameter R of the reinforcing steel bar to be welded is compared with the internal parameters of the matrix R0:

when R is not more than R1, selecting A1 from the die matrix A0 as a pressurizing die for the steel bar to be welded;

when R is more than R1 and less than or equal to R2, selecting A2 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

when R is more than R2 and less than or equal to R3, selecting A3 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

when R is more than R3 and less than or equal to R4, selecting A4 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

after the pressurized die is selected, the ends to be welded of the two steel bars to be welded are respectively placed into a crimping device, the welding ends are clamped by the crimping device, and the end faces of the steel rails are aligned.

6. The method for welding the high-strength corrosion-resistant steel bars according to claim 1, wherein a cooling air wind speed parameter matrix H0(H1, H2, H3, H4) is established for steel bars of different materials, wherein H1 is a first preset cooling air wind speed parameter, H2 is a second preset cooling air wind speed parameter, H3 is a third preset cooling air wind speed parameter, and H4 is a fourth preset cooling air wind speed parameter;

when the E is judged to be the E1 material, selecting H1 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E2 material, selecting H2 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E3 material, selecting H3 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E4 material, selecting H4 from the matrix H0 as a cooling wind speed parameter;

after the cooling wind speed parameters are selected, the cooling wind speed Q is calculated,and after the calculation is finished, adjusting the wind speed of the cooler to be Q so as to cool the steel bars.

7. The welding method of high-strength corrosion-resistant steel bars according to claim 1, wherein a safety temperature parameter matrix Z0(Z1, Z2, Z3, Z4) is established for different steel bars, wherein Z1 is a first preset safety temperature parameter, Z2 is a second preset safety temperature parameter, Z3 is a third preset safety temperature parameter, and Z4 is a fourth preset safety temperature parameter;

when the E is judged to be made of E1 material, selecting Z1 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E2 material, selecting Z2 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E3 material, selecting Z3 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E4 material, selecting Z4 from the matrix Z0 as a safe temperature parameter;

different safe temperatures S for different materials and/or different diameters of the steel bar,wherein Y is a compensation parameter of the diameter to the safe temperature S;

when the cooler is started to cool the steel bars, temperature detection is carried out on the welding position once every detection time length P ', and when the detected end face temperature S' is smaller than the safe temperature S, the cooler stops working.

8. The method for welding the high-strength corrosion-resistant reinforcing steel bars according to claim 1, wherein when the reinforcing steel bars to be welded are chamfered, the diameter R of the reinforcing steel bars to be welded is detected, and the chamfering amount C of the edge of the end face is calculated according to the measured R value, wherein C is a chamfering amount C calculation parameter, and after the calculation is completed, the chamfering amount of the end face of the reinforcing steel bar to be welded is set as C and chamfered.

9. The welding method of high strength corrosion resistant steel bars according to claim 1, characterized in that when the steel bar welding position is cooled to a safe temperature, the welding position is detected: when the maximum diameter of the welding area is more than 1.4R, the deformation length is more than 1.2R, and the relative eccentricity of the two welded steel bars is less than 0.15R, judging that the welded steel bars are qualified; and when the welded steel bar is unqualified, cutting the unqualified welding area and re-polishing the two ends of the steel bar so as to re-weld the steel bar.

10. The welding method of high-strength corrosion-resistant reinforcing bars according to claim 1, wherein when the diameters of the two reinforcing bars to be welded are R1 ' and R2 ' and R1 ' > R2 ', respectively, R1 ' is taken as the bar diameter value R, when R is greater than R2In time, the two to-be-welded steel bars cannot be welded.

Technical Field

The invention relates to the technical field of steel bar welding, in particular to a high-strength corrosion-resistant steel bar welding method.

Background

The connection mode of the steel bars mainly comprises four connection modes of binding and lapping, mechanical connection, sleeve grouting connection and welding. The joint should be arranged at the position with smaller stress as much as possible, and the key part with larger stress of the structure should be avoided. And the anti-seismic design avoids the reinforcement range of the stirrups at the beam end and the column end, and if the stirrups must be connected in the area, mechanical connection or welding is adopted.

The gas pressure welding is a welding method for welding workpieces together by heating the whole end face of the workpiece to be welded to a plastic or molten state by flame, applying a certain pressure and upsetting force at the same time, and not adding filler metal, and is easy to realize mechanized operation.

The temperature requirement and the heating condition of a welding part in the welding process of the current steel bar gas pressure welding technology are mostly judged by experience of operators, so that the welding quality is uneven, and the welding success rate is low.

Disclosure of Invention

Therefore, the invention provides a high-strength corrosion-resistant steel bar welding method, which is used for solving the problem of low welding success rate caused by judging the temperature requirement and the heating condition of a welding part by personnel experience in the prior art.

In order to achieve the above object, the present invention provides a method for welding high-strength corrosion-resistant steel bars, comprising:

polishing the end face of a steel bar to be welded to enable the end face to be flat, chamfering the edge of the end face by 45 degrees and determining the chamfering amount according to the diameter of the steel bar;

secondly, respectively putting the ends to be welded of the two steel bars to be welded into a crimping device, clamping each welding end by the crimping device, aligning the end faces of the two steel bars, and prepressing according to the diameter of the steel bars to adjust the distance between the two end faces;

preheating the welding ends of the two steel bars to be welded, and determining the air injection pressure of the injection type heater during formal heating according to the heating condition of the preheated steel bars;

regulating the jet pressure of the jet-suction type heater to the value determined in the step three so as to formally heat the welding ends of the two steel bars, and detecting the temperature of the welding ends of the two steel bars by a temperature sensor after a temperature measurement interval;

after the temperature of the welding ends of the two steel bars reaches the crimping requirement, the crimper pressurizes the ends to be welded of the two steel bars for the second time so that the welding end surfaces are bonded to form a welding surface;

after the gaps of the two steel bars are completely bonded, the jet-suction type heater uses neutral flame instead and uniformly swings in the specified range of the welding pressure surface to reversely heat the two welded steel bars, and the swing amplitude of the jet-suction type heater is twice of the diameter and the length of the steel bars;

seventhly, when foam formed by aggregation of grey-white balls appears in the heating range and moves along with the heating swing direction, the welding ends of the two steel bars are pressurized for the third time, and when the diameter of the raised part is 1.4-1.5 times of the diameter of the steel bars and the axial length of the raised part is 1.3-1.4 times of the diameter of the steel bars, the injection-suction type heater stops heating;

step eight, detecting the temperature of the steel bar welding position by a temperature detector after the self-cooling detection time so as to determine the air cooling wind speed;

step nine, after the temperature of the welding position of the steel bar is reduced to a safe range, closing the air cooling machine and removing a fixture on the crimping device to complete welding of the steel bar to be welded;

before the reinforcing steel bar to be welded is pressurized for the second time, a preheating temperature difference matrix t0 and an air injection quantity compensation parameter matrix alpha 0 are established; for the preheating temperature difference matrix t0, t0(t1, t2, t3, t4), where t1 is a first preset heating temperature difference, t2 is a second preset heating temperature difference, t3 is a third preset heating temperature difference, and t4 is a fourth preset heating temperature difference; for the air injection quantity compensation parameter matrix alpha 0, alpha 0 (alpha 1, alpha 2, alpha 3), wherein alpha 1 is a first preset air injection quantity compensation parameter, alpha 2 is a second preset air injection quantity compensation parameter, and alpha 3 is a third preset air injection quantity compensation parameter;

when the jet pressure value of the jet-suction type heater is set to Mi and the jet-suction type heater ignites the jet orifice, i is 1,2,3 and 4, the jet-suction type heater aims the jetted flame at a gap between two end surfaces to be welded for heating, when the temperature detection duration P is passed, the temperature sensor detects the temperature t of the end surfaces, calculates the absolute value delta t of the difference between t' and t, and compares the delta t with internal parameters of t 0:

when the delta t is less than or equal to t1, the jet pressure of the heater is not adjusted;

when t is more than t1 and is less than or equal to t2, selecting alpha 1 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' ═ Mi-Mi multiplied by alpha 1, and when t is less than t, Mi ' ═ Mi + Mi multiplied by alpha 1;

when t is more than t2 and is less than or equal to t3, selecting alpha 2 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' -Mi x alpha 2, and when t is less than t, Mi ' -Mi + Mi x alpha 2;

when t is more than t3 and is less than or equal to t4, selecting alpha 3 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' -Mi x alpha 3, and when t is less than t, Mi ' -Mi + Mi x alpha 3;

after the jet pressure of the heater is adjusted, flame sprayed by the heater is aligned to a gap between two end faces to be welded for heating, temperature detection is carried out on the end faces once every detection time length P, and the pressure welding device carries out secondary pressurization on the ends to be welded of the two reinforcing steel bars so as to bond the end faces until the detected end face temperature T' is greater than the temperature T required by pressure welding. Further, when the steel bars are pre-pressed, establishing an end face distance parameter matrix D0(D1, D2, D3 and D4), wherein D1 is a first preset end face distance parameter, D2 is a second preset end face distance parameter, D3 is a third preset end face distance parameter, D4 is a fourth preset end face distance parameter, and the distance parameters are sequentially reduced; when the reinforcing steel bar is pre-pressed, calculating the distance between the end surfaces of the two reinforcing steel bars to be welded according to the comparison result of the diameter R of the reinforcing steel bar to be welded and the internal parameters of the matrix R0:

when R is not more than R1, D1 is selected from the matrix D0 to calculate the end face distance L:

L＝R×D1

when R1 < R ≦ R2, D1 and D2 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R-R1)×D2

when R2 < R ≦ R3, D1, D2, and D3 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R2-R1)×D2+(R-R2)×D3

when R2 < R ≦ R3, D1, D2, D3, and D4 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R2-R1)×D2+(R3-R2)×D3+(R-R3)×D4

and after the calculation is finished, prepressing by the crimping device to adjust the distance between the two end faces of the steel bar to be welded to be L.

Further, before the reinforcing steel bars to be welded are pressurized for the second time, a reinforcing steel bar material matrix E0, a reinforcing steel bar crimping temperature matrix T0, an injection-suction type heater air injection pressure matrix M0 and a heating reinforcing steel bar material parameter matrix F0 are respectively established; for the steel bar material matrixes E0, E0(E1, E2, E3, E4), wherein E1 is a first preset steel bar material, E2 is a second preset steel bar material, E3 is a third preset steel bar material, and E4 is a fourth preset steel bar material; for the heating steel bar material parameter matrixes F0, F0(F1, F2, F3, F4), wherein F1 is a first preset steel bar material parameter, F2 is a second preset steel bar material parameter, F3 is a third preset steel bar material parameter, and F4 is a fourth preset steel bar material parameter; for the steel bar crimping temperature matrix T0, T0(T1, T2, T3, T4), where T1 is a first preset crimping temperature, T2 is a second preset crimping temperature, T3 is a third preset crimping temperature, and T4 is a fourth preset crimping temperature; for the jet-suction type heater air injection pressure matrixes M0, M0(M1, M2, M3, M4), wherein M1 is a first preset heater air injection pressure, M2 is a second preset heater air injection pressure, M3 is a third preset heater air injection pressure, and M4 is a fourth preset heater air injection pressure;

comparing the material E of the steel bar with the internal parameters of the matrix E0:

when the material E is judged to be the material E1, selecting F1 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E2, selecting F2 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E3, selecting F3 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E4, selecting F4 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material of the steel bar is Ei, i is 1,2,3 and 4, the material parameter of the steel bar is Fi, the temperature T required by the compression joint of the steel bar is calculated,wherein R is the diameter of the steel bar, and R is a compensation parameter of the diameter R of the steel bar to the crimping temperature T of the steel bar;

before the reinforcing steel bar to be welded is pressurized for the second time, the temperature T required by the reinforcing steel bar in crimping is compared with the internal parameters of T0:

when T is less than or equal to T1, selecting M1 from the matrix M0 as the pressure of the heater;

when T is more than T1 and less than or equal to T2, selecting M2 from the matrix M0 as the pressure of the heater;

when T is more than T2 and less than or equal to T3, selecting M3 from the matrix M0 as the pressure of the heater;

when T is more than T3 and less than or equal to T4, selecting M4 from the matrix M0 as the pressure of the heater;

when Mi is selected as the heater to spray air pressure, the end surface to be welded is heated by a standard temperature value t with a detection time length P,wherein k is a compensation parameter of the standard temperature value t;

further, when the reinforcing steel bars are pre-pressed, a mold matrix A0 and a reinforcing steel bar diameter matrix R0 are established; for the steel bar diameter matrixes R0 and R0(R1, R2, R3 and R4), wherein R1 is the diameter of a first preset steel bar, R2 is the diameter of a second preset steel bar, R3 is the diameter of a third preset steel bar, R4 is the diameter of a fourth preset steel bar, and the numerical values of the diameters are sequentially increased; for the mold matrix a0, a0(a1, a2, A3, a4), where a1 is a first preset mold, a2 is a second preset mold, A3 is a third preset mold, and a4 is a fourth preset mold;

when the reinforcing steel bar is pre-pressed, the diameter R of the reinforcing steel bar to be welded is compared with the internal parameters of the matrix R0:

when R is not more than R1, selecting A1 from the die matrix A0 as a pressurizing die for the steel bar to be welded;

when R is more than R1 and less than or equal to R2, selecting A2 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

when R is more than R2 and less than or equal to R3, selecting A3 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

when R is more than R3 and less than or equal to R4, selecting A4 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

after the pressurized die is selected, the ends to be welded of the two steel bars to be welded are respectively placed into a crimping device, the welding ends are clamped by the crimping device, and the end faces of the steel rails are aligned.

Further, a cooling air wind speed parameter matrix H0(H1, H2, H3 and H4) is established for the steel bars made of different materials, wherein H1 is a first preset cooling air wind speed parameter, H2 is a second preset cooling air wind speed parameter, H3 is a third preset cooling air wind speed parameter, and H4 is a fourth preset cooling air wind speed parameter;

when the E is judged to be the E1 material, selecting H1 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E2 material, selecting H2 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E3 material, selecting H3 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E4 material, selecting H4 from the matrix H0 as a cooling wind speed parameter;

after the cooling wind speed parameters are selected, the cooling wind speed Q is calculated,and after the calculation is finished, adjusting the wind speed of the cooler to be Q so as to cool the steel bars.

Further, a safety temperature parameter matrix Z0(Z1, Z2, Z3 and Z4) is established for the steel bars made of different materials, wherein Z1 is a first preset safety temperature parameter, Z2 is a second preset safety temperature parameter, Z3 is a third preset safety temperature parameter, and Z4 is a fourth preset safety temperature parameter;

when the E is judged to be made of E1 material, selecting Z1 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E2 material, selecting Z2 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E3 material, selecting Z3 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E4 material, selecting Z4 from the matrix Z0 as a safe temperature parameter;

different safe temperatures S for different materials and/or different diameters of the steel bar,wherein Y is a compensation parameter of the diameter to the safe temperature S;

when the cooler is started to cool the steel bars, temperature detection is carried out on the welding position once every detection time length P ', and when the detected end face temperature S' is smaller than the safe temperature S, the cooler stops working.

Further, when the steel bar to be welded is chamfered, the diameter R of the steel bar to be welded is detected, the chamfering amount C of the edge of the end face is calculated according to the measured R value, wherein C is R multiplied by C, C is a chamfering amount C calculation parameter, and the chamfering amount of the end face of the steel bar to be welded is set to C and chamfered after calculation.

Further, when the steel bar welding position is cooled to a safe temperature, the welding position is detected: when the maximum diameter of the welding area is more than 1.4R, the deformation length is more than 1.2R, and the relative eccentricity of the two welded steel bars is less than 0.15R, judging that the welded steel bars are qualified; and when the welded steel bar is unqualified, cutting the unqualified welding area and re-polishing the two ends of the steel bar so as to re-weld the steel bar.

Further, when the diameters of the two steel bars to be welded are R1 ' and R2 ' and R1 ' > R2 ', respectively, R1 ' is taken as the steel bar diameter value R, whenIn time, the two to-be-welded steel bars cannot be welded.

Further, when the flame is interrupted in the heating process, if the steel bar joint is completely closed when the flame is interrupted, the heating and the pressurizing are continued after the pressurizing/feeding until the crimping process is finished; if the steel bar joint is not completely closed when the flame is interrupted, cutting off the joint part and performing crimping again.

Compared with the prior art, the invention has the advantages that the steel bar to be welded is provided with a steel bar material matrix E0(E1, E2, E3, E4) and a heating steel bar material parameter matrix F0(F1, F2, F3, F4), the temperature T required by the compression joint of the steel bar is calculated according to the material E and the diameter R of the steel bar, the steel bar to be welded is provided with a steel bar compression joint temperature matrix T0(T1, T2, T3, T4), a jet suction type heater jet pressure matrix M0(M1, M2, M3, M4), a time length preheating temperature difference matrix T0(T1, T2, T3, T4) and a jet quantity compensation parameter matrix alpha 0 (alpha 1, alpha 2, alpha 3, alpha 4), the jet pressure Mi of the heater is determined according to the temperature T, the standard temperature value of a detection P sprayed out of the heating end face heating pressure Mi is calculated according to the jet pressure Mi, the heater is adjusted to be aligned with the jet gap between the two ends to be heated, when the temperature detection duration P passes, the temperature sensor detects the end face temperature t ', calculates the absolute value delta t of t' and t, compares the delta t with the internal parameter of t0, adjusts the heater spraying pressure according to the comparison result, determines the crimping temperature and the heater spraying pressure through a preset matrix and a calculation method, and can effectively determine various parameters in the welding process, thereby improving the success rate of the welding method.

Furthermore, the crimping device is provided with a die matrix A0(A1, A2, A3 and A4) and a steel bar diameter matrix R0(R1, R2, R3 and R4), and the crimping dies in pairs are selected according to the diameters of the steel bars, so that the stability of steel bar crimping is enhanced, and the success rate of the welding method is further improved.

Furthermore, an end face distance parameter matrix D0(D1, D2, D3 and D4) is arranged, the distance L between the two welding end faces is calculated according to the distance parameter and the diameter R, after calculation is completed, the distance between the two end faces of the steel bar to be welded is adjusted to be L through pre-pressing of the pressing device, and the distance between the two end faces is calculated scientifically, so that the success rate of the welding method is further improved.

Furthermore, a cooling air speed parameter matrix H0(H1, H2, H3 and H4) is arranged for the steel bars made of different materials, the optimal cooler air speed Q is calculated according to the air speed parameters and the steel bar material E, after calculation is completed, the cooler air speed is adjusted to Q to cool the welding position, and the optimal cooling air speed is calculated scientifically, so that the success rate of the welding method is further improved.

Further, the diameter R of the steel bar to be welded is detected, the chamfering amount C of 45 degrees of the edge of the end face is calculated, C is R multiplied by C, C is a chamfering amount C calculation parameter, chamfering with the chamfering amount C is carried out on the end face to be welded after calculation is finished, and the edge burrs of the steel bar are eliminated by chamfering the steel bar to be welded, so that the two steel bars are more stably pressed and connected, and the success rate of the welding method is further improved.

Further, after the welding position of the steel bars is cooled to the temperature, the welding position is detected: the maximum diameter of the welding area is larger than 1.4R, the deformation length is larger than 1.2R, the relative eccentricity of the two welded steel bars is smaller than 0.15R, the shape of the welding area should not be obviously protruded and collapsed, cracks should not be formed, the unqualified welding area is cut, the two ends of the steel bars are polished again for welding, the welding quality of the steel bars is detected after welding, the unqualified welding area is cut, the steel bars are welded again, and the safety of the welded steel bars is improved.

Further, when the diameters of the two steel bars to be welded are R1 ' and R2 ' and R1 ' > R2 ', respectively, R1 ' is taken as the steel bar diameter value R, whenIn time, the two steel bars to be welded cannot be welded, so that the applicability of the welding method is increased.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It is to be understood that the directional or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", and the like in the description of the present invention are for convenience of description only and do not indicate or imply that the devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention provides a high-strength corrosion-resistant steel bar welding method, which comprises the following steps:

polishing the end face of a steel bar to be welded to enable the end face to be flat, chamfering the edge of the end face by 45 degrees and determining the chamfering amount according to the diameter of the steel bar;

secondly, respectively putting the ends to be welded of the two steel bars to be welded into a crimping device, clamping each welding end by the crimping device, aligning the end faces of the two steel bars, and prepressing according to the diameter of the steel bars to adjust the distance between the two end faces;

preheating the welding ends of the two steel bars to be welded, and determining the air injection pressure of the injection type heater during formal heating according to the heating condition of the preheated steel bars;

regulating the jet pressure of the jet-suction type heater to the value determined in the step three so as to formally heat the welding ends of the two steel bars, and detecting the temperature of the welding ends of the two steel bars by a temperature sensor after a temperature measurement interval;

after the temperature of the welding ends of the two steel bars reaches the crimping requirement, the crimper pressurizes the ends to be welded of the two steel bars for the second time so that the welding end surfaces are bonded to form a welding surface;

after the gaps of the two steel bars are completely bonded, the jet-suction type heater uses neutral flame instead and uniformly swings in the specified range of the welding pressure surface to reversely heat the two welded steel bars, and the swing amplitude of the jet-suction type heater is twice of the diameter and the length of the steel bars;

seventhly, when foam formed by aggregation of grey-white balls appears in the heating range and moves along with the heating swing direction, the welding ends of the two steel bars are pressurized for the third time, and when the diameter of the raised part is 1.4-1.5 times of the diameter of the steel bars and the axial length of the raised part is 1.3-1.4 times of the diameter of the steel bars, the injection-suction type heater stops heating;

step eight, detecting the temperature of the steel bar welding position by a temperature detector after the self-cooling detection time so as to determine the air cooling wind speed;

and step nine, when the temperature of the welding position of the steel bar is reduced to a safe range, closing the air cooling machine and removing a fixture on the crimping device to complete welding of the steel bar to be welded.

Specifically, before the reinforcing steel bar to be welded is pressurized for the second time, a preheating temperature difference matrix t0 and an air injection amount compensation parameter matrix alpha 0 are established; for the preheating temperature difference matrix t0, t0(t1, t2, t3, t4), where t1 is a first preset heating temperature difference, t2 is a second preset heating temperature difference, t3 is a third preset heating temperature difference, and t4 is a fourth preset heating temperature difference; for the air injection quantity compensation parameter matrix α 0, α 0(α 1, α 2, α 3), where α 1 is a first preset air injection quantity compensation parameter, α 2 is a second preset air injection quantity compensation parameter, and α 3 is a third preset air injection quantity compensation parameter.

When the jet pressure value of the jet-suction type heater is set to Mi and the jet-suction type heater ignites the jet orifice, i is 1,2,3 and 4, the jet-suction type heater aims the jetted flame at a gap between two end surfaces to be welded for heating, when the temperature detection duration P is passed, the temperature sensor detects the temperature t of the end surfaces, calculates the absolute value delta t of the difference between t' and t, and compares the delta t with internal parameters of t 0:

when the delta t is less than or equal to t1, the jet pressure of the heater is not adjusted;

when t is more than t1 and is less than or equal to t2, selecting alpha 1 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' ═ Mi-Mi multiplied by alpha 1, and when t is less than t, Mi ' ═ Mi + Mi multiplied by alpha 1;

when t is more than t2 and is less than or equal to t3, selecting alpha 2 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' -Mi x alpha 2, and when t is less than t, Mi ' -Mi + Mi x alpha 2;

when t is more than t3 and is less than or equal to t4, selecting alpha 3 to compensate the jet pressure, and adjusting the jet pressure of the heater to be Mi ', when t is more than t, Mi ' -Mi x alpha 3, and when t is less than t, Mi ' -Mi + Mi x alpha 3;

after the jet pressure of the heater is adjusted, flame sprayed by the heater is aligned to a gap between two end faces to be welded for heating, temperature detection is carried out on the end faces once every detection time length P, and the pressure welding device carries out secondary pressurization on the ends to be welded of the two reinforcing steel bars so as to bond the end faces until the detected end face temperature T' is greater than the temperature T required by pressure welding. Specifically, when the reinforcing steel bar is pre-pressed, an end face distance parameter matrix D0(D1, D2, D3 and D4) is established, wherein D1 is a first preset end face distance parameter, D2 is a second preset end face distance parameter, D3 is a third preset end face distance parameter, D4 is a fourth preset end face distance parameter, and the distance parameters are sequentially reduced; when the reinforcing steel bar is pre-pressed, calculating the distance between the end surfaces of the two reinforcing steel bars to be welded according to the comparison result of the diameter R of the reinforcing steel bar to be welded and the internal parameters of the matrix R0:

when R is not more than R1, D1 is selected from the matrix D0 to calculate the end face distance L:

L＝R×D1

when R1 < R ≦ R2, D1 and D2 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R-R1)×D2

when R2 < R ≦ R3, D1, D2, and D3 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R2-R1)×D2+(R-R2)×D3

when R2 < R ≦ R3, D1, D2, D3, and D4 are selected from the matrix D0 to calculate the end face distance L:

L＝R1×D1+(R2-R1)×D2+(R3-R2)×D3+(R-R3)×D4

and after the calculation is finished, prepressing by the crimping device to adjust the distance between the two end faces of the steel bar to be welded to be L.

Specifically, before the reinforcing steel bar to be welded is pressurized for the second time, a reinforcing steel bar material matrix E0, a reinforcing steel bar crimping temperature matrix T0, an injection-suction type heater air injection pressure matrix M0 and a heating reinforcing steel bar material parameter matrix F0 are respectively established; for the steel bar material matrixes E0, E0(E1, E2, E3, E4), wherein E1 is a first preset steel bar material, E2 is a second preset steel bar material, E3 is a third preset steel bar material, and E4 is a fourth preset steel bar material; for the heating steel bar material parameter matrixes F0, F0(F1, F2, F3, F4), wherein F1 is a first preset steel bar material parameter, F2 is a second preset steel bar material parameter, F3 is a third preset steel bar material parameter, and F4 is a fourth preset steel bar material parameter; for the steel bar crimping temperature matrix T0, T0(T1, T2, T3, T4), where T1 is a first preset crimping temperature, T2 is a second preset crimping temperature, T3 is a third preset crimping temperature, and T4 is a fourth preset crimping temperature; for the jet-suction type heater air injection pressure matrixes M0, M0(M1, M2, M3, M4), wherein M1 is a first preset heater air injection pressure, M2 is a second preset heater air injection pressure, M3 is a third preset heater air injection pressure, and M4 is a fourth preset heater air injection pressure;

comparing the material E of the steel bar with the internal parameters of the matrix E0:

when the material E is judged to be the material E1, selecting F1 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E2, selecting F2 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E3, selecting F3 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material E is judged to be the material E4, selecting F4 from the heating steel bar material parameter matrix F0 as a steel bar material parameter;

when the material of the steel bar is Ei, i is 1,2,3 and 4, the material parameter of the steel bar is Fi, the temperature T required by the compression joint of the steel bar is calculated,wherein R is the diameter of the steel bar, and R is a compensation parameter of the diameter R of the steel bar to the crimping temperature T of the steel bar;

before the reinforcing steel bar to be welded is pressurized for the second time, the temperature T required by the reinforcing steel bar in crimping is compared with the internal parameters of T0:

when T is less than or equal to T1, selecting M1 from the matrix M0 as the pressure of the heater;

when T is more than T1 and less than or equal to T2, selecting M2 from the matrix M0 as the pressure of the heater;

when T is more than T2 and less than or equal to T3, selecting M3 from the matrix M0 as the pressure of the heater;

when T is more than T3 and less than or equal to T4, selecting M4 from the matrix M0 as the pressure of the heater;

when Mi is selected as the heater to spray air pressure, the end surface to be welded is heated by a standard temperature value t with a detection time length P,wherein k is a compensation parameter of the standard temperature value t;

specifically, when the reinforcing steel bar is pre-pressed, a mold matrix A0 and a reinforcing steel bar diameter matrix R0 are established; for the steel bar diameter matrixes R0 and R0(R1, R2, R3 and R4), wherein R1 is the diameter of a first preset steel bar, R2 is the diameter of a second preset steel bar, R3 is the diameter of a third preset steel bar, R4 is the diameter of a fourth preset steel bar, and the numerical values of the diameters are sequentially increased; for the mold matrix a0, a0(a1, a2, A3, a4), where a1 is a first preset mold, a2 is a second preset mold, A3 is a third preset mold, and a4 is a fourth preset mold;

when the reinforcing steel bar is pre-pressed, the diameter R of the reinforcing steel bar to be welded is compared with the internal parameters of the matrix R0:

when R is not more than R1, selecting A1 from the die matrix A0 as a pressurizing die for the steel bar to be welded;

when R is more than R1 and less than or equal to R2, selecting A2 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

when R is more than R2 and less than or equal to R3, selecting A3 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

when R is more than R3 and less than or equal to R4, selecting A4 from the mold matrix A0 as a pressurizing mold of the steel bar to be welded;

after the pressurized die is selected, the ends to be welded of the two steel bars to be welded are respectively placed into a crimping device, the welding ends are clamped by the crimping device, and the end faces of the steel rails are aligned.

Specifically, a cooling air wind speed parameter matrix H0(H1, H2, H3 and H4) is established for steel bars made of different materials, wherein H1 is a first preset cooling air wind speed parameter, H2 is a second preset cooling air wind speed parameter, H3 is a third preset cooling air wind speed parameter, and H4 is a fourth preset cooling air wind speed parameter;

when the E is judged to be the E1 material, selecting H1 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E2 material, selecting H2 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E3 material, selecting H3 from the matrix H0 as a cooling wind speed parameter;

when the E is judged to be the E4 material, selecting H4 from the matrix H0 as a cooling wind speed parameter;

after the cooling wind speed parameters are selected, the cooling wind speed Q is calculated,and after the calculation is finished, adjusting the wind speed of the cooler to be Q so as to cool the steel bars.

Specifically, a safety temperature parameter matrix Z0(Z1, Z2, Z3 and Z4) is established for steel bars made of different materials, wherein Z1 is a first preset safety temperature parameter, Z2 is a second preset safety temperature parameter, Z3 is a third preset safety temperature parameter, and Z4 is a fourth preset safety temperature parameter;

when the E is judged to be made of E1 material, selecting Z1 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E2 material, selecting Z2 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E3 material, selecting Z3 from the matrix Z0 as a safe temperature parameter;

when the E is judged to be made of E4 material, selecting Z4 from the matrix Z0 as a safe temperature parameter;

different safe temperatures S for different materials and/or different diameters of the steel bar,wherein Y is a compensation parameter of the diameter to the safe temperature S;

when the cooler is started to cool the steel bars, temperature detection is carried out on the welding position once every detection time length P ', and when the detected end face temperature S' is smaller than the safe temperature S, the cooler stops working.

Specifically, when the steel bar to be welded is chamfered, the diameter R of the steel bar to be welded is detected, the chamfering amount C of the edge of the end face is calculated according to the measured R value, wherein C is R multiplied by C, C is a chamfering amount C calculation parameter, and the chamfering amount of the end face of the steel bar to be welded is set to C and chamfered after calculation.

Specifically, when the steel bar welding position is cooled to a safe temperature, the welding position is detected: when the maximum diameter of the welding area is more than 1.4R, the deformation length is more than 1.2R, and the relative eccentricity of the two welded steel bars is less than 0.15R, judging that the welded steel bars are qualified; and when the welded steel bar is unqualified, cutting the unqualified welding area and re-polishing the two ends of the steel bar so as to re-weld the steel bar.

Specifically, when the diameters of the two steel bars to be welded are R1 ' and R2 ' and R1 ' > R2 ', respectively, R1 ' is taken as the steel bar diameter value R, whenIn time, the two to-be-welded steel bars cannot be welded.

Specifically, when the flame is interrupted in the heating process, if the steel bar joint is completely closed when the flame is interrupted, the heating and the pressurizing are continued after the pressurizing/feeding until the crimping process is completed; if the steel bar joint is not completely closed when the flame is interrupted, cutting off the joint part and performing crimping again.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.