Large tensile residual stress is detrimental to the structural integrity of welded structures. As a result, it is very important to understand the residual formation during the welding process. In this paper, a new non-contact welding residual stress measurement technique based on digital image correlation (DIC) is proposed as a way to investigate residual stress formation. To investigate the stress evolution of the welded plate, we conduct a series of experiments by using this new method. High-temperature full-field strain obtained from DIC was computed by incremental theory to acquire stress increment. Stress evolution and residual stress were obtained by superimposing the stress increment. Hole-drilling residual stress measurements for verification were also implemented. The maximum difference, which was 37 MPa between the two methods demonstrated that this new technique was able to characterize the full-field welding residual stress during the welding process.

较大的拉伸残余应力不利于焊接结构的结构完整性。因此，了解焊接过程中的残留形成非常重要。本文提出了一种基于数字图像相关（DIC）的非接触焊接残余应力测量技术，作为研究残余应力形成的一种方法。为了研究焊接板的应力变化，我们使用这种新方法进行了一系列实验。利用增量理论计算了由DIC获得的高温全场应变，得到了应力增量。通过叠加应力增量获得应力演化和残余应力。还实施了钻孔残余应力测量以进行验证。最大差异