A Study on Residual Stress Reduction Method of Weld Joint by Explosure Treatment

Abstract

In this study, local explosive treatment was used for the reduction of residual stress of weld joint and the effect of factor (type of explosive, quantity of explosive and the order of explosive treatment) on reduction of residual stress was investigated.
When the surface and backface of weld joint were treated at the same time with 6 detonating cords, the tensile residual stress of weld metal and HAZ in weld joint decreased from 400 MPa-300 MPa in the case of as-welded condition to 200 MPa-100 MPa. Especially with dynamite, the residual stresses decreased to ±30 MPa.