阅读说明：本技术 一种角钢塔塔脚二级焊缝焊接工艺 (Welding process for two-stage welding seam of tower foot of angle steel tower ) 是由 于大欢 康东华 巩全有 王会杰 李雪文 周洁 于 2021-07-02 设计创作，主要内容包括：本发明属于角钢塔塔脚焊接技术领域,尤其为一种角钢塔塔脚二级焊缝焊接工艺,角钢塔塔脚由一个底板、三个靴板以及多个加劲板组成,三个靴板分别包括通板、左靴板和右靴板,依次包括如下步骤：1下料；2制孔；3铣边机打坡口：采用铣边机对三个靴板进行坡口加工,坡口为45°；4拼装；5变位工装固定：采用变位工装对塔脚进行固定；6气保焊打底：7埋弧焊接：采用埋弧焊的焊接方式对三个靴板与底板之间的焊缝以及左靴板、右靴板与通板之间的焊缝进行焊接,熔透打底气保焊；8机器人焊接罩面；9加劲板焊接；该焊接工艺操作简单,普通焊接人员经过简单培训即可上岗操作,降低了工人劳动强度和技能要求,具有焊接效率高、焊接合格率高的特点。(The invention belongs to the technical field of welding of tower legs of an angle steel tower, and particularly relates to a welding process of a secondary welding seam of the tower legs of the angle steel tower, wherein each tower leg of the angle steel tower consists of a bottom plate, three shoe plates and a plurality of stiffening plates, each shoe plate comprises a through plate, a left shoe plate and a right shoe plate, and the welding process sequentially comprises the following steps: 1, blanking; 2, hole making; 3, beveling by an edge milling machine: beveling the three shoe plates by using an edge milling machine, wherein the beveling angle is 45 degrees; 4, assembling; 5, fixing a shifting tool: fixing the tower leg by adopting a position changing tool; 6, gas shield welding priming: 7, submerged arc welding: welding seams between the three shoe plates and the bottom plate and between the left shoe plate and the through plate and between the right shoe plate and the through plate by adopting a submerged arc welding mode, and performing penetration backing gas shield welding; 8, welding a cover surface by a robot; 9, welding the stiffening plates; the welding process is simple to operate, ordinary welding personnel can be operated on duty through simple training, the labor intensity of workers and the technical requirement are reduced, and the welding process has the characteristics of high welding efficiency and high welding qualified rate.)

1. A welding process for a secondary welding seam of a tower foot of an angle steel tower is characterized by comprising the following steps of: the method sequentially comprises the following steps:

(1) blanking: the angle steel tower foot comprises a bottom plate (1), three boot plates and a plurality of stiffening plates (5), wherein the three boot plates respectively comprise a through plate (2), a left boot plate (3) and a right boot plate (4), and a laser cutting machine is adopted to cut plates to respectively complete cutting and blanking of the bottom plate (1), the through plate (2), the left boot plate (3), the right boot plate (4) and the stiffening plates (5);

(2) hole making: drilling equipment is adopted to respectively drill the bottom plate (1), the through plate (2), the left shoe plate (3) and the right shoe plate (4) for connecting with main material angle steel and completing the installation of an angle steel tower;

(3) beveling by an edge milling machine: beveling the three shoe plates by using an edge milling machine, wherein the beveling is 45 degrees, and the positions of the beveling comprise the bottom edges of the three shoe plates and the inner side edges of the left shoe plate (3) and the right shoe plate (4);

(4) assembling: the assembling method comprises the following steps that a tool is adopted to assemble a bottom plate (1) and three boot plates, a through plate (2) is vertically arranged on the upper portion of the bottom plate (1), the bottom edge of the through plate is in spot welding with the upper surface of the bottom plate (1), a left boot plate (3) and a right boot plate (4) are distributed on the left side and the right side of the through plate (2), the inner side edges of the left boot plate (3) and the right boot plate (4) are in spot welding with the two side surfaces of the through plate (2) respectively, and the bottom edges of the left boot plate (3) and the right boot plate (4) are in spot welding with the upper surface of the bottom plate (1);

(5) the position changing tool is fixed: fixing the tower leg by adopting a position changing tool;

(6) gas shield welding priming: performing bottom sealing welding on welding seams between the three shoe plates and the bottom plate (1) and welding seams between the left shoe plate (3), the right shoe plate (4) and the through plate (2) in a gas shielded welding mode, wherein the current is 235-258A, the voltage is 27-29V, the welding speed is 200-220mm/min, and the heat input is 17-22kJ/cm during welding;

(7) submerged arc welding: welding seams between the three shoe plates and the bottom plate (1) and between the left shoe plate (3), the right shoe plate (4) and the through plate (2) in a submerged arc welding mode, wherein an included angle between a welding gun and the bottom plate (1) is 18-22 degrees during welding, the extending length of a welding wire is 28-32mm, the welding wire is aligned with the center of the welding seam to start welding, and the welding seam is adjusted to a position and an angle convenient to weld by adjusting a deflection tool during welding, so that submerged arc welding is conducted through gas-permeable shield welding;

(8) welding a cover by a robot: after submerged arc welding is finished, detecting the quality of a welding seam through ultrasonic waves, and then welding a cover surface through gas shielded welding by a welding robot;

(9) welding the stiffening plates: after finishing the overlay welding, the stiffening plates (5) are respectively welded at the end parts between the three boot plates and the bottom plate (1) in a gas shielded welding mode so as to play a role in strengthening and fixing.

2. The angle steel tower foot secondary weld joint welding process according to claim 1, characterized in that: the grooves machined on the bottom edges of the three boot plates and the inner side edges of the left boot plate (3) and the right boot plate (4) comprise single-side grooves or double-side grooves.

3. The angle steel tower foot secondary weld joint welding process according to claim 2, characterized in that: gaps between the bottom edges of the three shoe plates and the bottom plate (1) and butt joint gaps between the inner sides of the left shoe plate (3) and the right shoe plate (4) and the through plate (2) are all between 1 and 4 mm.

4. The angle steel tower foot secondary weld joint welding process according to claim 1, characterized in that: when submerged arc welding is carried out, an arc striking plate is adopted for striking an arc so as to avoid defects at the initial part of a welding seam.

5. The angle steel tower foot secondary weld joint welding process according to claim 1, characterized in that: the frock that shifts includes frame (6), the front side of frame (6) is connected with through the rotation axis and turns (7), and installs the actuating mechanism who is used for controlling to turn (7) inclination adjustment on frame (6), it installs fixed disk (8) that are used for fixed tower foot to rotate on the leading flank of turning (7), the rear side of turning (7) is installed and is used for driving the rotatory first motor of fixed disk (8).

6. The angle steel tower foot secondary weld joint welding process according to claim 5, characterized in that: the driving mechanism comprises a second motor, a driving gear and a driven half gear (9), the second motor is fixedly installed on the rack (6), the driving gear is fixedly installed on an output shaft of the second motor, the driven half gear (9) is fixedly installed at one end of the rotating shaft, and the driving gear is in meshing transmission connection with the driven half gear (9).

Technical Field

The invention belongs to the technical field of welding of tower legs of angle steel towers, and particularly relates to a welding process of a secondary welding seam of the tower leg of the angle steel tower.

Background

With the improvement of the quality requirement of a national power grid, the requirement of some key engineering tower feet reaches a second-level welding seam, a rolling shear is mostly adopted to process a groove at present, the groove processed by the rolling shear has certain defects, the smoothness of the groove surface is not enough, the truncated edge cannot be ensured, the groove processed by the rolling shear has the defects that steel materials at the rear part of the rolling shear cannot be completely separated from parent metal, burrs are left, the groove parent metal is layered during the rolling shear, and the welding quality is directly influenced by the factors.

Disclosure of Invention

To solve the problems set forth in the background art described above. The invention provides a welding process for a secondary welding seam of a tower foot of an angle steel tower, which is simple to operate, common welding personnel can be operated on duty after simple training, the labor intensity and the skill requirement of workers are reduced, and the welding process has the characteristics of high welding efficiency and good quality.

In order to achieve the purpose, the invention provides the following technical scheme: a welding process for a two-stage weld joint of a tower foot of an angle steel tower sequentially comprises the following steps:

(1) blanking: the angle steel tower foot comprises a bottom plate, three boot plates and a plurality of stiffening plates, wherein the three boot plates respectively comprise a through plate, a left boot plate and a right boot plate, the plates are cut by a laser cutting machine, and cutting and blanking of the bottom plate, the through plate, the left boot plate, the right boot plate and the stiffening plates are respectively completed.

(2) Hole making: and drilling the bottom plate, the through plate, the left shoe plate and the right shoe plate by adopting drilling equipment respectively, and connecting the drilling equipment with the main material angle steel to complete the installation of the angle steel tower.

(3) Beveling by an edge milling machine: and the beveling machine is adopted to bevel the three shoe plates, the beveling is 45 degrees, and the positions of the beveling comprise the bottom edges of the three shoe plates and the inner side edges of the left shoe plate and the right shoe plate.

(4) Assembling: adopt the frock to assemble bottom plate and three boots board, lead to the board and set up perpendicularly on the upper portion of bottom plate and the upper surface spot welding of its base and bottom plate, left boots board and right boots board distribute in the left and right sides that leads to the board, and the inboard side of left boots board and right boots board is respectively with the both sides face spot welding that leads to the board, and the base of left boots board and right boots board all welds with the upper surface spot welding of bottom plate.

(5) The position changing tool is fixed: and fixing the tower leg by adopting a position changing tool.

(6) Gas shield welding priming: and performing bottom sealing welding on the welding seams between the three shoe plates and the bottom plate and the welding seams between the left shoe plate and the through plate and the welding seams between the right shoe plate and the through plate in a gas shielded welding mode, wherein the current is 235-258A, the voltage is 27-29V, the welding speed is 200-220mm/min, and the heat input is 17-22 kJ/cm.

(6) Submerged arc welding: welding seams between the three shoe plates and the bottom plate and between the left shoe plate and the through plate and between the right shoe plate and the through plate by adopting a submerged arc welding mode, wherein an included angle between a welding gun and the bottom plate is 18-22 degrees during welding, the extending length of a welding wire is 28-32mm, the welding wire is aligned with the center position of the welding seam to start welding, and the welding seam is adjusted to a position and an angle convenient to weld by adjusting a deflection tool during welding, so that submerged arc welding is conducted, and gas is permeated for shielded welding.

(7) Welding a cover by a robot: and after the submerged arc welding is finished, detecting the quality of a welding seam through ultrasonic waves, and then welding a welding overlay through gas shield welding by a welding robot.

(8) Welding the stiffening plates: after finishing the overlay welding, the stiffening plates are respectively welded at the end parts between the three boot plates and the bottom plate in a gas shielded welding mode so as to play a role in strengthening and fixing.

Preferably, the bevels machined on the bottom edges of the three shoe plates and the inner side edges of the left shoe plate and the right shoe plate comprise single-side bevels or double-side bevels.

Preferably, the gaps between the bottom edges of the three shoe plates and the bottom plate and the butt joint gaps between the inner sides of the left shoe plate and the right shoe plate and the through plate are all between 1 and 4 mm.

Preferably, before the submerged arc welding, the welding seam is subjected to back sealing by adopting a manual gas shielded welding mode so as to prevent breakdown during the submerged arc welding.

Preferably, the submerged arc welding adopts an arc striking plate for striking an arc for avoiding the defect of the initial part of the welding seam.

Preferably, the frock of shifting includes the frame, the front side of frame rotates through the rotation axis and is connected with the body of turning, and installs the actuating mechanism who is used for controlling the inclination adjustment of turning in the frame, rotate on the leading flank of turning and install the fixed disk that is used for fixed column foot, the rear side of turning is installed and is used for driving the rotatory first motor of fixed disk.

Preferably, the driving mechanism comprises a second motor, a driving gear and a driven half gear, the second motor is fixedly mounted on the frame, the driving gear is fixedly mounted on an output shaft of the second motor, the driven half gear is fixedly mounted at one end of the rotating shaft, and the driving gear is in meshing transmission connection with the driven half gear.

Compared with the prior art, the invention has the beneficial effects that:

the welding process is simple to operate, ordinary welding personnel can be operated on duty after being trained simply, the labor intensity of workers is reduced, the technical requirements are lowered, and the welding process has the advantages of being high in welding efficiency and high in qualification rate.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of a tower foot in front view;

FIG. 2 is a schematic side view of the deflection tool;

in the figure: the device comprises a base plate 1, a through plate 2, a left boot plate 3, a right boot plate 4, a stiffening plate 5, a rack 6, a swivel 7, a fixed disc 8 and a driven half gear 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-2, the present embodiment provides the following technical solutions: a welding process for a two-stage weld joint of a tower foot of an angle steel tower sequentially comprises the following steps:

(1) blanking: the angle steel tower foot comprises a bottom plate 1, three boot plates and three stiffening plates 5, wherein the three boot plates respectively comprise a through plate 2, a left boot plate 3 and a right boot plate 4, the plates are cut by a laser cutting machine, and cutting and blanking of the bottom plate 1, the through plate 2, the left boot plate 3, the right boot plate 4 and the stiffening plates 5 are respectively completed.

(2) Hole making: and drilling equipment is adopted to respectively drill the bottom plate 1, the through plate 2, the left shoe plate 3 and the right shoe plate 4, and is used for being connected with main material angle steel and completing installation of the angle steel tower.

(3) Beveling by an edge milling machine: adopt the edge milling machine to carry out groove preparation to three boots board, the groove is 45, the position of groove includes the base and the left boots board 3 of three boots board, the inboard side of right boots board 4, the base and the left boots board 3 of three boots board, the groove of the inboard side preparation of right boots board 4 includes unilateral groove or two side slope mouths, select the panel of suitable thickness according to the step foot specification, thinner selection unilateral side slope mouth processing, adopt two side slope mouth processing in this embodiment, the groove that the edge milling machine processed out no matter the finish, the control effect of groove angle and groove blunt edge is all fine, the equipment requirement of second grade welding seam is satisfied completely to the groove of processing out.

(4) Assembling: the assembling method comprises the steps of assembling a bottom plate 1 and three shoe plates by adopting a tool, degreasing and derusting are carried out within 20mm of two sides of a weld joint before assembling, no sundries exist in a welding area, welding defects such as slag inclusion, air holes and poor fusion are prevented from being generated during welding, a through plate 2 is vertically arranged on the upper portion of the bottom plate 1, the bottom edge of the through plate is in spot welding with the upper surface of the bottom plate 1, a left shoe plate 3 and a right shoe plate 4 are distributed on the left side and the right side of the through plate 2, the inner sides of the left shoe plate 3 and the right shoe plate 4 are respectively in spot welding with two side faces of the through plate 2, the bottom edges of the left shoe plate 3 and the right shoe plate 4 are in spot welding with the upper surface of the bottom plate 1, gaps between the bottom edges of the three shoe plates and the bottom plate 1 and butt-joint gaps between the inner sides of the left shoe plate 3 and the right shoe plate 4 and the through plate 2 are all between 1 and 4mm, and the spot welding quality is equal to a formal weld joint and not higher than 2/3 of the formal weld joint.

(5) The position changing tool is fixed: the tower foot is fixed by adopting a position changing tool, the position changing tool comprises a frame 6, the front side of the frame 6 is rotatably connected with a rotating body 7 through a rotating shaft, a driving mechanism for controlling the inclination angle adjustment of the rotating body 7 is installed on the frame 6, a fixed disc 8 for fixing the tower foot is rotatably installed on the front side surface of the rotating body 7, a first motor for driving the fixed disc 8 to rotate is installed on the rear side of the rotating body 7, the output end of the first motor is connected with a speed reducer, the output end of the speed reducer is connected with the fixed disc 8, the driving mechanism comprises a second motor, a driving gear and a driven half gear 9, the second motor is fixedly installed on the frame 6, the driving gear is fixedly installed on the output shaft of the second motor, the driven half gear 9 is fixedly installed at one end of the rotating shaft, the driving gear is in meshing transmission connection with the driven half gear 9, and when in use, during the next welding, the position and the angle of the welding seam can be adjusted by controlling the first motor and the second motor to operate respectively.

(6) Gas shield welding priming: and performing bottom sealing welding on the welding seams between the three shoe plates and the bottom plate 1 and the welding seams between the left shoe plate 3, the right shoe plate 4 and the through plate 2 by adopting a gas shielded welding mode, wherein the current is 235-258A, the voltage is 27-29V, the welding speed is 200-220mm/min, and the heat input is 17-22kJ/cm during welding.

(6) Bottoming by submerged arc welding: welding seams between the three shoe plates and the bottom plate 1 and between the left shoe plate 3 and the right shoe plate 4 and the through plate 2 by adopting a submerged arc welding mode, wherein an included angle between a welding gun and the bottom plate 1 is 18-22 degrees during welding, the extending length of the welding wire is 28-32mm, the included angle between the welding gun and the bottom plate 1 is 20 degrees in the embodiment, the extending length of the welding wire is 30mm, the welding wire is aligned with the center of the welding seam to start welding, the welding wire on one side of the tower foot is welded after the seam welding on the other side is finished, the welding current is properly increased during welding, the welding seam is adjusted to be convenient to weld by adjusting a deflection tool during welding, the welding seam is properly conveyed during welding to ensure that the root part is well melted and the two sides are well fused, an arc striking plate is adopted during submerged arc welding to avoid the defect of the initial part of the welding seam, the submerged arc welding has large melting depth, No need of back chipping, better impurity removal performance, easy operation, high welding efficiency and the like.

(7) Welding a cover by a robot: after submerged arc welding is finished, the quality of a welding seam is detected by ultrasonic waves, even if individual defects exist, the welding seam is easy to process, then gas shield welding is carried out on a welding overlay through a welding robot, the welding robot has the advantages of stable performance, capability of continuously working, low heat input and the like, the welding efficiency can be effectively improved, the welding deformation is reduced, and the welding seam is attractive in forming.

(8) Welding the stiffening plates: after finishing the overlay welding, the stiffening plates 5 are respectively welded at the end parts between the three boot plates and the bottom plate 1 in a gas shield welding mode, so that the effect of strengthening and fixing is achieved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.