Defect repair welding process for arc-surface weld joint

Abstract

The invention discloses a defect repair welding process for an arc-surface weld joint. The process comprises the following steps that S1, flaw detection is conducted on the weld joint of an arc surface of a workpiece, and a defect area is marked; S2, base metal around the defect area is protected and isolated, and the weld joint of the defect area is dug out; S3, flaw detection is conducted on thedefect area with the weld joint dug out, if no defect is found, S4 is executed, and if a defect is found, S5 is executed; S4, the weld joint of the defect area is dug out again, and S2 is executed; S5, the periphery of the defect area is cleaned; and S6, the workpiece is placed at a PA repair welding position, and repair welding is conducted on the defect area. According to the defect repair welding process for the arc-surface weld joint, the interlayer penetration can be effectively controlled through a layer-by-layer repair welding method, the operation difficulty is reduced, the problem that parts are scrapped due to improper operation of a repair welding method is solved, internal defects of the weld joint are eliminated, consumable loss is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a defect welding repair process for arc surface weld seams. Background technique [0002] After the welding of the EMU frame is completed, due to the load-bearing requirements of some welds, it is necessary to perform UT flaw detection on the welds on the arc surface, which is different from the general welding repair method of flat welding seams. Currently, there is no suitable arc surface weld welding Therefore, the success rate and efficiency of welding similar structural welds in the early stage are not high, resulting in the following quality risks: [0003] 1. The failure of welding and repair will cause the frame to be scrapped, causing more economic losses; [0004] 2. The repair is not complete, resulting in repeated welding repairs, which affects the strength of the weld and the steel plate and causes excessive loss of manpower and material resources; [0...

AI Technical Summary

Problems solved by technology

[0002] After the welding of the EMU frame is completed, due to the load-bearing requirements of some welds, it is necessary to perform UT flaw detection on the welds on the arc surface, which is different from the general welding repair method of flat welding seams. Currently, there is no suitable arc surface weld welding Therefore, the success rate and efficiency of welding similar structural welds in the early stage are not high, resulting in the following quality risks:

[0003] 1. The failure of welding and repair will cause the frame to be scrapped, causing more economic losses;

[0004] 2. The repair is not complete, resulting in repeated welding repairs, which affects the strength of the weld and the steel plate and causes excessive loss of manpower and material resources;

[0005] 3. Multiple welding repairs at the same position will cause heat concentration and cause welding deformation of each seat, which requires repeated repairs

[0009] Although the above-mentioned prior art proposes technical solutions for repair welding and repair of welded parts, there is no welding repair plan specifically for arc-shaped surface welds, and there is no complete operation process, and there are problems of incomplete repair and repeated welding repairs. Happening

[0010] Therefore, it is necessary to improve the deficiencies and defects of the existing technology, and provide a defect welding repair process for arc surface welds. By standardizing the operation process, the operation difficulty is reduced, and the layer by layer repair welding method can be effectively controlled. Inter-penetration, which solves the problem of scrapped parts caused by improper operation of welding repair methods, eliminates internal defects of welds, reduces consumption of consumables, and improves production efficiency

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