针对TZM钼合金,研究了钨极氩弧(TIG)焊工艺中不同焊接电流对焊接品质的影响,分析了焊接接头的显微组织及性能。结果表明,当TIG焊焊接电流为210 A,焊接速度4 mm/s,氩气流量8～12 L/min时,可获得品质优良的焊缝。焊接接头组织主要由焊缝中心粗大的柱状晶及热影响区的等轴晶组成,取代了母材的片层状纤维织构,削弱了材料的强度,改善了材料的塑性。 In this paper, the influence of different welding current on the welding quality of TZM molybdenum alloy was studied. The microstructure and properties of the welded joint were analyzed. The results show that when the current of TIG welding is 210 A, the welding speed is 4 mm / s and the argon flow rate is 8-12 L / min, the weld with good quality can be obtained. The welded joints mainly consist of equiaxed grains with coarse weld center and heat affected zone, which replace the lamellar fiber texture of the base material, weaken the strength of the material and improve the plasticity of the material.