Numerical simulation of residual stress in brazing joint between cemented carbide and steel

Abstract

The values and their distribution of residual stress in cemented carbide–steel brazing joints were studied by means of finite element numerical simulation, and the residual stress in the joint was also calculated when external compressive loads were exerted on the brazed specimen during the cooling process. The results indicate that residual stress in the joint is not uniform and has higher values in the matrix near the seam, especially in the cemented carbide. Therefore, it is considered that the cemented carbide near the seam will be the fracture location when the joint is broken. If a compressive pressure of 60 MPa is exerted on the brazed specimen during the cooling process, the residual stress in the joint has the lowest value, and in this case the fracture location may be the interface between the cemented carbide and filler alloy. Numerical simulation and experimental results both indicate that in order to obtain a lower residual stress and higher shear strength of the joint, it is necessary to exert a compressive pressure on the brazed specimen during the cooling process.