Dissimilar metal welds (DMW) of ferritic to austenitic stainless steel are broadly used in steam generators working in power generation industries. Frequent failure of DMWs from the heat-affected zone (HAZ) of the ferritic part necessitates structural integrity assessment of the DMWs in order to determine and extend the lifetime of these components. In this regard, typical DMWs of SA516–309L–304L and SA516–309L/308L–304L attributed to domestic reactors were fabricated under different welding conditions. The effects of conventional and narrow weld groove configurations, buttering layer, and varying buttering layer width on the through-thickness residual stress fields in the DMWs were investigated experimentally and with the help of numerical simulations. Results show that the narrow groove weld is beneficial in reducing the residual stresses in the weld zone. Incorporating an additional buttering layer in the narrow groove joint further reduced the residual stresses across the weld joint. A 6 mm thick buttering layer was found to be competent enough to minimize the residual stresses dispersed across the weld cross-section.

铁素体与奥氏体不锈钢的异种金属焊缝（DMW）广泛用于发电行业中的蒸汽发生器。由于铁素体零件的热影响区（HAZ）导致DMW频繁失效，因此需要对DMW进行结构完整性评估，以确定并延长这些部件的使用寿命。因此，在不同的焊接条件下，制造了国产反应堆的典型SA516–309L–304L和SA516–309L / 308L–304L DMW。实验研究了传统的和狭窄的焊接坡口配置，润滑脂层和变化的润滑脂层宽度对DMWs厚度贯穿残余应力场的影响，并通过数值模拟的方法进行了研究。结果表明，窄坡口焊缝有利于减少焊接区的残余应力。在窄槽接头中加入额外的黄油层可进一步降低整个焊接接头的残余应力。发现6毫米厚的黄油层足以胜任，可以最大程度地减小分散在焊缝横截面上的残余应力。