Abstract The residual stresses (RSs) generated from partial penetration repair welding of a specimen extracted from the 4th stage vane of a gas turbine replace studied. The RSs are maximum in the heat-affected zone, beneath the weld along the weld center at the specimen mid-section. The RS field tends to exhibit over a large volume beneath the weld bead where severe restraint conditions exist in the repair welding. The stress triaxiality field was presented as an assessment tool to find the critical areas of welding RSs. The maximum value of stress triaxiality occurs beneath the weld bead in somewhere different from maximum residual stress locations. This indicates the role of a through-thickness component of RSs in the integrity of repair welds.

中文翻译：

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镍基IN939高温合金补焊残余应力评价

摘要 研究了取自燃气轮机第四级叶片的试样局部熔透补焊产生的残余应力（RSs）。RS 在热影响区中最大，在焊缝下方沿试样中间部分的焊缝中心。RS 场往往会在焊道下方呈现出很大的体积，其中补焊中存在严格的约束条件。应力三轴性场被用作一种评估工具，以找到焊接 RS 的关键区域。应力三轴度的最大值出现在焊道下方与最大残余应力位置不同的地方。这表明 RS 的全厚度分量在修补焊缝完整性中的作用。