12Cr1MoV钢与P91钢在火力发电厂大机组应用较多,在一些管座、阀门处经常进行焊接。由于其组织性能差异较大,采用何种焊接方法,争议较大。目前,国内电力行业普遍采用高匹配焊接方法。本文从理论与实践中对两种钢焊接接头性能进行了分析与研究,得出了这两种钢焊接工艺合理的焊接方法。 12Cr1MoV steel and P91 steel are widely used in large units of thermal power plants, and are often welded at some pipe bases and valves. Because of their different organizational performance, using what kind of welding method, controversial. At present, the domestic power industry widely used high matching welding method. This article from the theory and practice of the two kinds of steel welded joints performance analysis and research, obtained two kinds of steel welding process reasonable welding method.