A 3-5mm stainless steel plate single side welding double side free forming welding method

Abstract

The invention relates to the technical field of welding, in particular to a 3-5 mm stainless steel plate single-side welding double-sided free forming welding method. The method comprises the following steps of firstly, carrying out milling, cleaning and other pretreatment on a workpiece to be welded; then carrying out manual spot welding for positioning and fixing; then fixing the workpiece to bewelded to a welding workbench through a pressing plate; and finally completing welding by adopting a CMT mix (CMT + PMC) welding process. According to the method, the manual mode is prepared before welding, the operation is simple, the labor intensity is low, the welding joint welding adopts robot welding, the automation degree is high, the welding efficiency is greatly improved, the welding deformation is smaller, the single-side welding double-sided free forming of welding line is guaranteed, the hot input of the weld joint can be accurately controlled, the welding heat affected zone is reduced, the welding spattering is small, and the quality of the weld joint is greatly improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a single-side welding and double-side free-forming welding method for a 3-5mm stainless steel plate. Background technique [0002] At present, in the manufacturing industry, there are usually two common welding methods for single-sided welding and double-sided free forming of stainless steel plates with a thickness of 3-5mm. The first method first uses argon arc welding to weld the front side, then flips the workpiece and then welds the back side; This method directly uses pulse multiple control MIG welding (PMC) to complete the welding at one time. However, there are some problems in the above two methods. In the first method, the quality of manual arc welding is unstable and requires repeated repair welding. The operation of turning the workpiece increases the welding process, and the welding and clamping are cumbersome and complicated, resulting in low production efficiency....

AI Technical Summary

Problems solved by technology

In the first method, the quality of manual arc welding is unstable and requires repeated repair welding. The operation of turning the workpiece increases the welding process, and the welding and clamping are cumbersome and complicated, resulting in low production efficiency.

In addition, the first method has a lot of smoke and dust during the welding process, which is harmful to the health of on-site operators.

The second method requires custom-made special fixtures on the one hand, so the cost is higher, and on the other hand, the large welding heat input leads to serious welding deformation

In addition, the second method also has problems such as large spatter and waste of welding consumables

[0003] Chinese patent CN104858557A discloses a combined welding method for austenitic stainless steel medium and thick plates (9-13mm), which has the following significant differences compared with the method of the present application: ① the thickness of the stainless steel plate in this application is 3-5mm, while CN104858557A The thickness of stainless steel is 9-13mm, and the applicable welding methods are completely different due to different plate thicknesses; ②In this application, the workpiece to be welded does not need to be grooved, but in CN104858557A, a V-shaped groove is required on the butt joint surface of the workpiece to be welded, and the process is more complicated The cost is higher; ③This application adopts the CMT mix welding process to form at one time, while in CN104858557A, it needs to be carried out step by step. Specifically, pulse plasma welding is used to make the bottom, and then pulse tungsten argon arc welding is used to cover the surface to complete the welding. Welding processes are essentially different and cannot learn from each other

[0004] To sum up, it can be seen that a 3-5mm stainless steel plate single-sided welding double-sided free forming welding process with good welding effect, low cost and simple process has not been found so far. The successful development of related welding equipment and processes is particularly urgent and necessary.

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