Repair welding method of copper alloy guide rail

Abstract

The invention discloses a repair welding method of a copper alloy guide rail, and belongs to the technical field of welding. The repair welding method comprises the following steps of machining a spigot for containing a sealing plate at the surface defect of a copper alloy guide rail to be repaired; cleaning the surface defect and the sealing plate of the copper alloy guide rail; assembling the sealing plate in the spigot; and welding the sealing plate with the copper alloy guide rail to be welded by adopting a laser filler wire welding mode. The sealing plate and the copper alloy guide rail are welded by adopting a laser filler wire welding mode, the laser welding speed is high, the welding depth is deeper, and the deformation amount generated by welding is small. Meanwhile, in the welding process, the solubility of hydrogen in the copper alloy increases sharply along with the increase of the temperature of a molten pool, bubbles exist at the root of a weld joint, the spigot is machined at the defect, so that the bubbles can be discharged from a gap between the spigot and the bottom surface of the defect position, so that the quality of the weld joint can be improved, and the pumping pressure experiment requirements of the copper alloy guide rail after repair welding are met.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a repair welding method for a copper alloy guide rail. Background technique [0002] For copper alloy guide rails with surface defects, it is necessary to repair welding on the surface defects of copper guide rails to ensure the smooth surface of copper alloy. [0003] At present, the common repair welding method is: adopt friction stir welding welding method to weld the sealing plate on the surface defects of the copper alloy guide rail, so that the surface of the copper alloy guide rail is smooth. Wherein, the sealing plate is made of the same copper alloy material as the copper guide rail. [0004] However, when the assembly gap between the sealing plate and the copper alloy guide rail at the defect is too large, the material in this area will be missing during welding, resulting in insufficient heat generated by friction stir welding and low temperature, which will easily l...

AI Technical Summary

Problems solved by technology

[0004] However, when the assembly gap between the sealing plate and the copper alloy guide rail at the defect is too large, the material in this area will be missing during welding, resulting in insufficient heat generated by friction stir welding and low temperature, which will easily lead to the failure of the welding material to reach the plastic state As a result, tearing occurs, so that the copper alloy guide rail after repair welding cannot meet the experimental requirements in the subsequent flaw detection test and pump pressure test.

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