K-TIG welding system and method

Abstract

The invention discloses a K-TIG welding system. The K-TIG welding system is different from a fixed wire feeding mode of a traditional TIG, can automatically identify the large arc width of the K-TIG and set a high wire feeding speed area and a low wire feeding speed area in the wire feeding process according to an arc width detection value, so that swinging wire feeding is carried out, and the purpose of one-time welding forming is achieved. When a medium plate is welded through K-TIG, the defects of undercut, weld joint front depression and the like often occur. According to the K-TIG welding system, a weld joint can be filled by effectively utilizing a high-energy melting welding wire of a K-TIG welding arc, so that the welding defects of poor molten pool fluidity, undercut and the like during K-TIG welding are effectively overcome, and one-time forming of the weld joint is achieved. The welding process is stable, the welding quality is high, welding deformation and residual stress are low, slag removal is not needed after welding, the K-TIG welding system can be widely applied to the welding of low-carbon steel, stainless steel, nickel-based alloy and other materials, and the K-TIG welding production efficiency is improved.

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 is not higher than 180mm / min. The K-TIG welding technology uses a large current (>300A) to generate a large arc pressure to perform one-time penetration welding on medium and thick plates. Due to the lack of welding consumables, the gravity of the molten pool and the large arc, the weld seam Forming is prone to undercutting. [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 st...

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

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