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.

由于测量仪器的改进，现在可以对焊接工件进行实际测量。理论和实测焊接应力曲线之间存在差异。在这项研究中，对三种低碳钢焊缝进行了应力分析，以研究M形应力分布背后的原因。从两种不同的仪器获得的焊接残余应力显示出相同的趋势。局部高应力位置位于焊接热影响区的回火区。凝固收缩导致未熔化的金属在熔合边界附近压缩，并导致不连续的应力分布，从而在热影响区产生局部高应力位置。