Mechanical Behavior in Local Post Weld Heat Treatment (Report IV) -Influence of residual stress distribution in multi-pass welding-

摘要

Local post weld heat treatment (local PWHT) is usually performed for tempering and relaxation of residual stresses. The degree of stress reduction is influenced by the initial welding residual stress and the local PWHT applied. The residual stress distribution after the local PWHT for multi-pass welding joint of a pipe with heavy wall thickness is not very clearly understood yet. In this paper, the time history and the final distribution of the stress components under local PWHT, with different types of multi-pass welding process, have been studied.