Laser Welding Method for Repairing Penetrating Defects of Base Metal

Abstract

The invention relates to a laser welding method for a repairing penetrating defect of base metal. The method comprises the following steps that S1, the to-be-repaired defect of the base material is pretreated and machined into a groove weld joint with a wide upper portion and a thin lower portion; S2, the width of a weld joint lower groove is determined, if the width of the lower groove is greaterthan the diameter of a welding wire, at least one layer of convex weld welding are conducted on the two sides of the lower groove side by side in the length direction of the weld joint until the width of the lower groove is the same as the diameter of the welding wire, then priming layer welding is conducted on the weld joint between convex welds on the two sides, and if the width is smaller thanor equal to the diameter of the welding wire, the priming layer is directly welded; S3, multiple welding layers are superimposed and welded on the priming layer, a welding layer zone is formed, and the top of a welding layer block is lower than a weld joint upper groove; S4, a repair layer is superimposed and welded on the welding layer block, and the top of the repair layer is higher than the weld joint upper groove; and S5, the repair layer higher than the upper groove is ground, and thus the repair layer is flush with the upper groove.

Description

technical field [0001] The invention relates to the technical field of thin plate and ultra-thin plate precision special material product repair, in particular to a laser welding method for repairing penetrating defects of base metals. Background technique [0002] In the field of military industry and aerospace technology, it is generally made of precision special materials, which have extremely high requirements for the performance of the product. When a penetrating defect occurs in a thin plate or an ultra-thin plate, it needs to be repaired by welding, otherwise the entire product will be scrapped, resulting in cause huge losses. When laser welding repairs this type of defect, traditional welding methods generally use argon arc welding, cold welding, laser cladding, etc., and laser cladding is used to start welding from the bottom of the defect. When the laser beam irradiates the welding wire, only When the upper surface of the welding wire is irradiated, the lower surf...

AI Technical Summary

Problems solved by technology

[0002] In the field of military industry and aerospace technology, it is generally made of precision special materials, which have extremely high requirements for the performance of the product. When a penetrating defect occurs in a thin plate or an ultra-thin plate, it needs to be repaired by welding, otherwise the entire product will be scrapped, resulting in cause huge losses

When laser welding repairs this type of defect, traditional welding methods generally use argon arc welding, cold welding, laser cladding, etc., and laser cladding is used to start welding from the bottom of the defect. When the laser beam irradiates the welding wire, only When the upper surface of the welding wire is irradiated, the lower surface of the welding wire will block the laser light, resulting in unfused phenomenon in the part covered by the welding wire, so that the repaired part and the base metal are not tightly bonded, forming a fragile area, and the repaired part still has undercuts , porosity, cracks and other defects are prone to cracking in actual use, affecting the overall performance of the equipment

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