Practical examination of the welding residual stress in view of low-carbon steel welds
Hsuan-Han Lai, Weite Wu
Abstract
The practical measurement of a welded workpiece is now feasible due to the improvement in the measuring instruments. There is a discrepancy between the theoretical and the measured welding stress profiles. In this study, stress analysis is performed on three low-carbon steel welds to investigate the reason behind the M-shaped stress profile. The welding residual stresses obtained from two different instruments show the same trend. A local high stress position is located in the tempered zone of the welding heat-affected zone. The solidification shrinkage leads to the compression of the un-melted metal near the fusion boundary and causes the discontinuous stress profile, resulting in the local high stress position in the heat-affected zone.