Relief of residual stresses in 2 1/4 Cr-1Mo weldments by PWHT and its prediction by uniaxial relaxation testing

TWI Industrial Member Report Summary 395/1989

By H J U Cotton and R H Leggatt

Background

1. To determine the effects of hold temperature, heating and cooling rates, hold time and external restraint on the relief of residual stress in 2¼Cr-1Mo steel weldments.

2. To investigate the relationship between stress relief in weldments and stress relaxation in test specimens subject to corresponding heat treatment conditions.