Diffusion welding method for tin bronze and steel welded structures

Abstract

The invention discloses a diffusion welding method for tin bronze and steel welded structures. The diffusion welding method is characterized by comprising steps of 1, machining a plurality of components according to drawings, carrying out oil and rust removal treatment on welded surfaces of the multiple components and then assembling the components to obtain welded assemblies; 2, placing the welded assemblies between lower support plates in furnaces of vacuum diffusion welding equipment and separating the welded assemblies from the support plates by graphite paper; 3, allowing the internal vacuum degree of the vacuum diffusion welding equipment to range from 1.0*10<-3> to 1.0*10<-4> Pa under the control and carrying out heating and pressurizing treatment on the welded assemblies; 4, cooling the welded assemblies and fetching weldments. The components comprise steel matrixes, tin bronze plates and closed end covers. The diffusion welding method has the advantages that loss of tin bronze compositions QSn10-2-3 can be prevented, and the material stability can be guaranteed; casting defects of tin bronze QSn10-2-3 can be eliminated to a certain extent, and copper matrixes can be guaranteed against cracking after heat treatment is carried out on the weldments.

Description

technical field [0001] The invention relates to diffusion welding of dissimilar materials, in particular to a diffusion welding method of tin bronze QSn10-2-3 and steel welding structure. Background technique [0002] The friction pair materials of hydraulic pumps / motors, rotors and sliding shoes in my country's aerospace equipment generally use copper alloys, that is, a layer of copper alloy with excellent anti-wear properties is attached as an anti-wear layer at parts with severe friction and wear under working conditions. The connection between the anti-wear layer and the part matrix (high-quality structural steel) is generally achieved by diffusion welding. With the continuous upgrading of aerospace equipment, higher requirements are put forward for the performance of the matching hydraulic pump / motor. The anti-wear performance of the friction pair material determines the service life of the product. The higher the anti-wear performance, the longer the product life. , an...

AI Technical Summary

Problems solved by technology

The use of tin bronze QSn10-2-3 with excellent anti-wear properties to replace the original copper alloy as the friction pair material can meet the requirements of equipment use, but the current diffusion welding method between tin bronze QSn10-2-3 and steel has component loss and post-weld Problems of Cracking of Copper Substrate in Heat Treatment

Images