Vibrating wire-feeding surfacing method

Abstract

The invention relates to a vibrating wire-feeding method which is characterized in that right and left swinging of a welding gun is combined with reciprocating vibration of a welding wire; the automatic wire-feeding process is accompanied by the axial vibration of the welding wire; a molten welding material is deposited on the internal wall of a pipe, and the fluidity of a welding pool is greatly improved, so as to further improve the surfacing efficiency; the vibrating welding wire can uniformly stir the molten pool in the melting process of the welding wire, especially for the material with poor fluidity, such as nickel-base alloy, so that gas can escape rapidly when metal in the molten pool is stirred, and hot welding cracks and pores are reduced; as the vibrating wire-feeding stirs the molten pool, solidification and crystallization in the molten pool are uniform; the metallurgical structure of a surfacing layer is uniform and exquisite; the mechanical property of the surfacing layer is greatly superior to those of normal argon tungsten-arc welding and gas metal-arc welding; the quality of a surfacing joint is improved to a great extent; the property is good; the yield of products is greatly increased; and the property of the surfacing joint is greatly improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for vibrating surfacing welding of bimetal composite pipe ends. Background technique [0002] At present, in oil and gas field development projects, due to the transportation of oil and natural gas containing more corrosive media, ordinary carbon steel pipes cannot meet the anti-corrosion performance requirements. Ordinary carbon steel + corrosion inhibitor only slows down the corrosion rate of pipelines, and does not fundamentally solve question. Due to the simple mechanical combination between the carbon steel base pipe and the stainless steel liner of the mechanical composite pipe, there is a certain gap. Due to the existence of the gap during the butt joint process of the pipe, it is easy to have defects such as air holes and unmelted welding during butt welding. Quality and efficiency are severely compromised; this problem can be solved by overlaying t...

AI Technical Summary

Problems solved by technology

Argon tungsten arc welding can solve the problem of unfused. During the surfacing process of argon tungsten arc welding, the tungsten electrode maintains the welding pool, but the corrosion-resistant alloy welding wire is sent between the molten pool and the tungsten electrode respectively, and its deposition Efficiency dropped dramatically

[0005] To sum up, the common MIG shielded surfacing welding has the problems of large spatter, high deposition rate, and low welding quality; ordinary tungsten argon arc welding has low welding deposition rate, and conventional Defects such as unmelted interlayers and strip-shaped pores are prone to appear during the process, which seriously affect the quality and efficiency of industrial production

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