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此文研究了Ｘ２０ＣｒＭｏＶ１２１钢采用ＴＩＧ＋ＳＭＡＷ工艺所焊接头的力学性能，重点探讨了不同化学成分焊丝ＴＩＧ打底，不同焊接及热处理条件的影响。研究表明，Ｘ２０ＣｒＭｏＶ１２１钢大径厚壁管ＴＩＧ打底选用１２％Ｃｒ焊丝对保证接头力学性能更趋合理；在焊缝金属抗冷裂纹性上，２．５％Ｃｒ焊丝ＴＩＧ打底优于１２％Ｃｒ焊丝，且两种焊丝打底所焊接头力学性能均达到技术要求。采用部分“马氏体”焊接法［预热（２５０～３００）℃］，小线能量多层多道焊，是保证Ｘ２０ＣｒＭｏＶ１２１钢焊接接头使用性能十分必要的工艺措施。
In this paper, the mechanical properties of X20CrMoV121 steel welded by TIG + SMAW were studied, and the effects of different chemical composition welding wire TIG primer, different welding and heat treatment conditions were discussed. The research shows that TIG backing of X20CrMoV121 steel with large diameter thick-walled tube is more reasonable with 12% Cr welding wire to ensure the mechanical properties of joint. In the weld metal cold crack resistance, 2.5% Cr welding wire TIG backing is better than 12% Cr wire, and the two kinds of welding wire bottom welding mechanical properties have reached the technical requirements. The use of some “martensitic” welding [preheating (250 ~ 300) ℃], small multi-pass multi-pass energy welding is to ensure the X20CrMoV121 steel welded joints performance is necessary process.