Process for achieving laser cladding of silver layer on surface of high-current aluminum bus hardware terminal

Abstract

The invention discloses a process for achieving laser cladding of a silver layer on the surface of a high-current aluminum bus hardware terminal. The process comprises the following steps that 1, thesurface of the high-current aluminum bus hardware terminal is pretreated, surface oxide is removed through manual polishing, and it is ensured that the workpiece surface is exposed out of a matrix aluminum alloy material; 2, a supporting base plate is installed on the side, not to be clad with the silver layer, of the high-current aluminum bus hardware terminal, and a whole workpiece is installedon a workbench; 3, the portion to be clad with the silver layer is cleaned, residual oil contamination on the surface is removed, and it is ensured that the silver layer preparation face is sufficiently clean; 4, silver cladding treatment is carried out on one side of the high-current aluminum bus hardware terminal through laser cladding equipment; and 5, the two sides of different hardware terminals on a large-current aluminum bus are subjected to silver cladding treatment through the operation in the steps 2-4, and the place, clad with the silver layer, of the workpiece is polished, and treatment is complete. The obtained silver coating is compact, and has the good bonding effect with the matrix.

Description

technical field [0001] The invention relates to the treatment of conductive components, in particular to a laser cladding silver layer process on the surface of a metal fitting terminal of a high-current aluminum busbar. Background technique [0002] The high-current aluminum busbar is an important conductive part in the electrical circuit. In order to improve its conductivity and reduce the contact resistance, it is often silver-plated on the contact surface of its joints to achieve this purpose. However, the existing silver plating process has the problems of thin coating and low bonding strength. Due to the large overcurrent and high temperature rise during use, and the influence of vulcanization in the air, the silver plating layer often appears aging, peeling, and falling off. And other problems, greatly reducing its service life, serious will cause shutdown, resulting in power loss. At the same time, highly toxic substances such as cyanide are often used in electropla...

AI Technical Summary

Problems solved by technology

[0003] Thermal spraying is a method of preparing silver coating, but this method is harsh and will cause a lot of noise; large heat input will cause deformation of the workpiece; the silver coating has large porosity and low density, and the coating The bonding strength between the layer and the substrate is between metallurgical bonding and mechanical occlusion, and has not achieved true metallurgical bonding

In addition, the powder utilization rate of this method is low, and it is not easy to recycle, which will cause a certain amount of waste of coating materials

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