Welding method for effectively inhibiting weld toe defects of medium-thickness plate annular weld joint

Abstract

The invention discloses a welding method for effectively inhibiting weld toe defects of a medium-thickness plate annular weld joint, and belongs to the field of welding. The welding method specifically comprises the following steps of a) forming a groove; b) fixing; c) preheating; d) positioning welding; e) backing welding; f) filling and cover surface welding; g) slow cooling after welding; h) grinding after welding; and i) inspecting after welding. According to the welding method, the weld joint in each layer is welded in two times during welding in the step e) and the step f), arc startingand arc stopping are carried out at the end surfaces of the two ends of rectangular steel, four corners are avoided, and the occurrence of the weld toe defects of the medium-thickness plate annular weld joint is effectively inhibited. The welding method has the advantages that the process is simple, the operation is convenient, the practicability is high, and the high-strength welding of a medium-thickness plate annular steel structure is realized through the design of the welding process method.

Description

technical field [0001] The invention belongs to a welding method, in particular to a welding method for effectively suppressing weld toe defects in circular weld seams of medium and thick plates. Background technique [0002] The medium-thick plate annular steel structure on the arm of the loader bears alternating loads during use, and the strength of the welds is crucial. The weld seam of this structure is ring-shaped, and welding defects are prone to occur during welding, especially the four corners of the structure, which are stress-concentrated parts and are subject to large forces. Once welding defects, especially welding toe defects, are prone to structural fracture The phenomenon of serious safety hazards, this problem urgently needs to be resolved. Contents of the invention [0003] The object of the present invention is to provide a welding method for effectively suppressing weld toe defects in circular weld seams of medium and thick plates, so as to realize no w...

AI Technical Summary

Problems solved by technology

The weld seam of this structure is ring-shaped, and welding defects are prone to occur during welding, especially the four corners of the structure, which are stress-concentrated parts and are subject to large forces. Once welding defects, especially welding toe defects, are prone to structural fracture Phenomenon, resulting in serious security risks, this problem urgently needs to be resolved

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