A Laser Cladding Method for Controlling Copper Penetration Cracks

Abstract

The invention provides a laser cladding method used for controlling producing of copper permeating cracks. The method is used for solving the technical problem that copper permeating cracks are proneto being produced during copper / steel laser heterogenous welding in the prior art. The method comprises the steps that firstly, materials are prepared, specifically, nickel base alloy powder and copper alloy powder are prepared; secondly, drying is performed, specifically, the nickel base alloy powder and the copper alloy powder are dried; thirdly, a steel surface is pretreated, specifically, thesteel surface is cleaned and dried; fourthly, a transition layer is subjected to cladding, specifically, the nickel base alloy powder is sprayed to the steel surface and heated through laser to be melted so as to cover the steel surface, and the transition layer is formed; fifthly, copper alloy is subjected to cladding, the copper alloy powder is sprayed to the steel surface and heated through laser to be melted so as to cover the steel surface; and sixthly, cooling and solidifying are performed, specifically, cladding metal is cooled to be in a liquid state and solidified. By means of the technical scheme provided by the embodiment of the invention, the technical effects that the corrosion resistance and abrasion resistance of the cladding layer are improved, and the copper permeating cracks are controlled can be achieved.

Description

technical field [0001] The invention relates to the field of laser cladding, in particular to a laser cladding method for controlling the generation of copper penetration cracks. Background technique [0002] Laser cladding is a method that uses a high-energy laser beam to act on the powder that is pre-coated on the metal surface or is fed synchronously, so that it can be rapidly heated and solidified to form a good metallurgical bond. Compared with traditional surface strengthening and repairing technologies, laser cladding has the advantages of high precision, high efficiency, and high metallurgical bonding strength. It can meet the needs of remanufacturing and repairing parts with complex structures that require high precision and high bonding strength. Laser cladding of aluminum bronze on Q235 steel can improve the corrosion resistance of carbon steel and expand its application prospects. However, it is difficult to avoid copper penetration cracks in the copper-iron lase...

AI Technical Summary

Problems solved by technology

As long as the temperature in the cladding process is higher than the melting point of the copper alloy, copper-iron two-phase wetting will proceed, and penetration cracks will occur when the tensile stress reaches the material limit, and the accumulation of copper at the crack tip will cause the crack to continue extension, which also limits copper / steel laser dissimilar welding as well as laser cladding means

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