A k-tig welding system and method

Abstract

The invention discloses a K-TIG welding system. Different from the fixed wire feeding method of traditional TIG, the invention can automatically identify the large arc width of K-TIG, and set high and low feeding in the process of wire feeding according to the detection value of the arc width. wire speed area, so as to perform swing wire feeding to achieve the purpose of one-time welding and forming. When K-TIG welding medium and thick plates, defects such as undercut and welding seam face depression often occur. The use of the present invention can effectively utilize the high-energy melting wire of the K-TIG welding arc to fill the welding seam, thereby effectively solving the problem of melting during K-TIG welding. Welding defects such as poor pool fluidity and undercuts are eliminated, and the weld seam can be formed at one time. The welding process of the invention is stable, the quality of the welding seam is high, the welding deformation and residual stress are low, and no slag cleaning is required after welding. efficiency.

Description

technical field [0001] The invention belongs to the technical field of K-TIG welding, in particular to a K-TIG welding system and method. Background technique [0002] Traditional argon arc welding equipment for medium and thick plates such as low carbon steel, stainless steel and nickel-based alloys has low welding filling efficiency and welding speed not higher than 180mm / min. The K-TIG welding technology uses a large current (>300A) to generate a large arc pressure to carry out one-time penetration welding of medium and thick plates. Forming is prone to undercut. [0003] In petrochemical pipelines, pressure vessels and other products and equipment, a cover welding needs to be carried out after one K-TIG welding. This process not only needs to replace the welding equipment, but also needs to control the interlayer temperature for special materials such as stainless steel. There is a certain increase in time and cost, and how to realize the real one-time welding seam ...

AI Technical Summary

Problems solved by technology

[0003] In various products and equipment such as petrochemical pipelines and pressure vessels, a cover welding is required after K-TIG welding. This process not only needs to replace the welding equipment, but also needs to control the interlayer temperature for special materials such as stainless steel. Equipment and There is a certain increase in time and cost, how to realize the real one-time weld seam forming technology of K-TIG welding needs to be perfected

[0004] On the other hand, due to the wide K-TIG welding arc, the frontal width of the one-time welding seam can reach more than 12mm, while the diameter of the welding wire used for automatic welding is generally about 2mm. Meet K-TIG welding one-time weld formation

The K-TIG welding speed is as fast as 300mm / min, the molten pool has a large volume and low fluidity, and it is difficult for the welding wire to cover the entire weld seam after melting, resulting in undercut defects when K-TIG welding medium and thick plate materials, which cannot be done at one time Defects such as weld formation

Images