阅读说明：本技术 一种300系不锈钢泰勒双焊轮电阻缝焊焊接焊接工艺 (300-series stainless steel Taylor double-welding-wheel resistance seam welding process ) 是由 白伟伟 陈刚 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种300系不锈钢泰勒双焊轮电阻缝焊焊接焊接工艺,其特点是采用泰勒双焊轮电阻缝焊焊接时控制的焊接工艺参数包括：焊接电流、焊接速度、搭接量、1#焊轮压力、2#焊轮压力；焊接速度为750cm/min,搭接量为2mm,1#焊轮压力为950㎏,2#焊轮压力950㎏；焊接电流的取值依据300不锈钢带钢的厚度进行调整。本发明的有益效果是提供了厚度≤1.5mm的300系不锈钢泰勒双焊轮电阻缝焊焊接的工艺参数,根据带钢厚度设置焊接电流和焊缝搭接量,提高焊缝熔合性,焊缝强度及韧性得到了优化,焊缝平整光滑,无开裂、未熔合、未焊透、焊穿现象,满足退火酸洗生产线的生产加工需求,保证产品质量并提高产量。(The invention discloses a 300 series stainless steel Taylor double-welding-wheel resistance seam welding process, which is characterized in that welding process parameters controlled when the Taylor double-welding-wheel resistance seam welding is adopted comprise: welding current, welding speed, lap joint quantity, 1# welding wheel pressure and 2# welding wheel pressure; the welding speed is 750cm/min, the lap joint amount is 2mm, the pressure of the welding wheel No. 1 is 950 kg, and the pressure of the welding wheel No. 2 is 950 kg; the value of the welding current is adjusted according to the thickness of the 300 stainless steel strip steel. The invention has the beneficial effects that the technological parameters of 300 series stainless steel Taylor double-welding wheel resistance seam welding with the thickness less than or equal to 1.5mm are provided, the welding current and the overlap amount of the welding seam are set according to the thickness of the strip steel, the welding seam fusion is improved, the strength and the toughness of the welding seam are optimized, the welding seam is flat and smooth, the phenomena of cracking, incomplete fusion, incomplete penetration and welding penetration are avoided, the production and processing requirements of an annealing and pickling production line are met, the product quality is ensured, and the yield is improved.)

1. A300 series stainless steel Taylor double welding wheel resistance seam welding process is characterized in that: the welding technological parameters controlled during resistance seam welding by adopting the Taylor double welding wheels comprise: welding current, welding speed, lap joint quantity, 1# welding wheel pressure and 2# welding wheel pressure; the welding speed is 750cm/min, the lapping amount is 2mm, the pressure of the 1# welding wheel is 950 kg, and the pressure of the 2# welding wheel is 950 kg; the unit of the welding current is ampere (A), the value of the welding current is adjusted according to the thickness of 300 stainless steel strip steel, and the specific table is as follows:

thickness (mm) 0.6 0.7 0.8 0.9 1.0 1.2 1.5 Welding current (A) 7000 7100 7200 7300 7400 7600 7800

2. The 300-series stainless steel Taylor double-welding-wheel resistance seam welding process according to claim 1, characterized in that: the welding process is used for welding stainless steel with the grades of 304, 316L, 321 and 301.

Technical Field

The invention belongs to the technical field of stainless steel welding, and particularly relates to a Taylor double-welding-wheel resistance seam welding process for guaranteeing continuous production of 300-series stainless steel.

Background

The stainless steel has very strict requirements on the surface quality, and during the operation of an annealing and pickling line, the speed of a process section is greatly reduced most abstainly, so that the over-annealing phenomenon of the strip steel in an annealing furnace can be caused, and the defects of over-pickling and pollution of the strip steel in a subsequent pickling section can be caused; the influence of the stop of the production line is the largest, so that the good weldability of the inlet is ensured, and the continuous and stable operation of the production line is very important. Therefore, the welding machine is key equipment for ensuring the continuous production of the stainless steel plate annealing line and has the function of welding and connecting the front and the rear coils of strip steel. The continuous annealing unit has the characteristics of high production rhythm, more passes in the furnace, huge shutdown loss and the like, and requires a welding machine to have high welding efficiency, stable welding process, smooth and no obvious bulge on the surface of a welding seam, high welding seam strength, good welding seam toughness, and the phenomena of incomplete penetration, incomplete fusion, slag inclusion, welding perforation and the like. In the prior art, a Taylor double-welding-wheel resistance seam welding machine is used for welding in the production of chrome-nickel (300 series in the United states), the welding machine is of a double-welding-wheel rolling seam welding type, the adopted principle is a resistance welding middle seam welding principle, metal does not need to be filled during welding, the production efficiency is high, the deformation of a welding piece is small, and automation is easy to realize. After the welding under the existing process conditions is finished, the welding seam is easy to crack, unfused, and shrunk holes and other defects, so that the strength and toughness of the welding seam are insufficient, the welding seam passes through a production line and passes through a plurality of rollers (forward and reverse bending) with different diameters (phi 110-phi 1000mm) from an inlet to an outlet, so that the deformation of the welding seam is large, and the strip breakage phenomenon is easy to occur. In order to avoid the accidents, the welding line needs to be operated to a test table, slight cracking phenomenon exists in the middle of surface observation, a sand hammer is used for beating the welding line to test whether the welding line can meet the production requirement, the welding line cracks immediately after beating test by the sand hammer, the production requirement cannot be met, the welding line needs to be returned to a welding machine for shearing and welding again, and the steps are repeated; repeated welding and repeated inspection are carried out, the welding time of the inlet of the production line is too long, the loop quantity of the inlet and the outlet of the production line is insufficient, the speed of strip steel in a process section has to be reduced, the production efficiency and the yield are seriously influenced, the welding time of part of steel plates is too long, the loop quantity of the production line is seriously insufficient, the steel plates can only be stopped, and the quality of the on-line stainless steel plates is influenced while the yield is influenced. In order to ensure the normal operation of the production line and the quality of products, under the condition that the inspection is unqualified, the carbon dioxide gas shielded welding is used for re-welding only after the resistance seam welding, so as to ensure the performance of the welding seam.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art when 300 series stainless steel is welded, the invention aims to provide a 300 series stainless steel Taylor double-welding-wheel resistance seam welding process, which improves the weldability, ensures the normal operation of an annealing and pickling line, ensures the product quality and improves the yield.

2. Technical scheme

In order to achieve the purpose, the invention adopts the following technical scheme:

a300 series stainless steel Taylor double welding wheel resistance seam welding process is characterized in that welding process parameters controlled when the Taylor double welding wheel resistance seam welding is adopted comprise: welding current, welding speed, lap joint quantity, 1# welding wheel pressure and 2# welding wheel pressure; the welding speed is 750cm/min, the lapping amount is 2mm, the pressure of the 1# welding wheel is 950 kg, and the pressure of the 2# welding wheel is 950 kg; the unit of the welding current is ampere (A), the value of the welding current is adjusted according to the thickness of 300 stainless steel strip steel, and the specific table is as follows:

thickness (mm)	0.6	0.7	0.8	0.9	1.0	1.2	1.5
								Welding current (A)	7000	7100	7200	7300	7400	7600	7800

The resistance seam welding process of the Taylor double-welding wheel provided by the invention is used for welding stainless steel with the grades of 304, 316L, 321 and 301.

The invention uses the resistance seam welder of Taylor's double-welding wheel, the structure includes:

the welding wheel mechanism comprises two groups of resistance welding wheels (a 1# welding wheel and a 2# welding wheel) and a group of flattening wheels, and is arranged on the welding trolley;

the welding wheel power supply system comprises a rectifying unit and a welding transformer, wherein a current induction coil is arranged on the welding transformer and transmits a current signal to the rectifying unit; when the current changes, the rectifying unit can automatically adjust and control the trigger angle to keep the welding current stable;

the double-cutting shear is arranged on the welding trolley, and the strip steel joints are cut to be uniform before welding, so that conditions are created for the next step of accurate lap joint and welding;

the front and rear strip steel centering devices comprise front and rear centering clamps, vertical guide rollers, sleeve lifting rollers and pinch rollers, and align the strip tail of the front strip steel and the strip head of the rear strip steel to create conditions for welding;

the punching device is used for punching and marking the weld joint and is used for tracking the position of the full-line weld joint;

and the auxiliary system comprises a pneumatic system, a power supply system, a rectification system, a cooling system and a computer control system.

The pressure of the welding wheel of the No. 1 welding wheel and the pressure of the No. 2 welding wheel of the Taylor double-welding-wheel resistance welding machine can be independently adjusted, and the welding heat of the two welding wheels can be adjusted by adjusting the pressure of the welding wheels because the contact resistance of the lap joint of the strip steel is changed along with the change of the pressure of the welding wheels. During welding, the 1# welding wheel and the 2# welding wheel perform relay heating on the strip steel; and the subsequent resistance welding wheel carries out secondary heating on the welding line, controls the cooling speed of the welding line and obtains an ideal metallurgical structure.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that the technological parameters of 300 series stainless steel Taylor double-welding wheel resistance seam welding with the thickness less than or equal to 1.5mm are provided, the welding current and the overlap amount of the welding seam are set according to the thickness of the strip steel, the welding seam fusion is improved, the strength and the toughness of the welding seam are optimized, the welding seam is smooth and flat, the phenomena of cracking, incomplete fusion, incomplete penetration and welding penetration are avoided, the production and processing requirements of an annealing and pickling production line are met, the normal operation of the production line is ensured, and the yield is improved on the premise of ensuring the quality of stainless steel products.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram showing the positional relationship between the strip steel welded by resistance seam welding with the Taylor double welding wheels.

In the figure: 1-1# welding wheel 2-2# welding wheel 3-strip steel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the invention. 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.

Comparative example 1

The technological parameters to be controlled during resistance seam welding of the Taylor double welding wheel comprise: the welding device comprises a current, a welding speed, a lap joint quantity, a 1# welding wheel pressure and a 2# welding wheel pressure, wherein the value range of the parameters is selected according to the thickness of stainless steel strip steel, and the welding device is specifically as follows:

the welding process parameters of the comparative example 1 are welded by stainless steel with the grades of 304, 316L, 321 and 301, the welded joint after welding has slight cracking phenomenon and higher fusion property, and the requirements of annealing and pickling operation cannot be met.

Comparative example 2

The technological parameters to be controlled during resistance seam welding of the Taylor double welding wheel comprise: the welding device comprises a current, a welding speed, a lap joint quantity, a 1# welding wheel pressure and a 2# welding wheel pressure, wherein the value range of the parameters is selected according to the thickness of stainless steel strip steel, and the welding device is specifically as follows:

the welding process parameters of the comparative example 2 are welded by stainless steel with the grades of 304, 316L, 321 and 301, the welded joint after welding has slight cracking, the fusion property is better than that of the comparative example 1, and the requirements of annealing and pickling operation cannot be met.

Comparative example 3

The technological parameters to be controlled during resistance seam welding of the Taylor double welding wheel comprise: the welding device comprises a current, a welding speed, a lap joint quantity, a 1# welding wheel pressure and a 2# welding wheel pressure, wherein the value range of the parameters is selected according to the thickness of stainless steel strip steel, and the welding device is specifically as follows:

the welding process parameters of comparative example 2 were welded with stainless steel grades 304, 316L, 321, 301, and the fusion after welding was good, with more spatter on both sides of the weld.