Strain field analysis of weld with trailing impact rolling to control residual stress and distortion and prevent hot cracking

Weld with trailing impactive rolling (WTIR) is a new technology to reduce the weld residual stress and distortion. The front impact roller exerts transverse compression plastic strain on the weld which is in the brittle temperature range, this will counteract the tensile strain which leads to hot cracking. The rear impact roller stretches longitudinal and transverse compressive plastic deformation of the weld adequately, thus reduces the residual deformation and stress of the weldment. The experimental results show there is no hot cracking in the WTIR weld. The longitudinal deflection deformation and the transverse contraction deformation of the weld with WTIR are reduced to 1/10 and 1/5 of the ordinary weld respectively, and the residual stress in the weld also decreases greatly.