对尺寸60 mm×3 mm的S904L超级奥氏体不锈钢管进行单面焊双面成形的钨极氩弧焊，对接头的显微组织、力学性能和耐腐蚀性能进行研究。结果表明：接头焊缝表面未出现气孔、焊瘤、凹陷、咬边等缺陷，内部未出现裂纹、未熔合、未焊透等缺陷，焊缝成形性能良好；焊缝组织为柱状晶+等轴晶，热影响区与母材组织为奥氏体；接头的抗拉强度不低于525 MPa，且接头在热影响区断裂，断裂性质为韧性断裂；弯曲180°后，面弯试样和背弯试样表面均无裂纹，满足标准要求；热影响区的显微硬度最高，焊缝的次之，母材的最低；焊缝与母材的晶间腐蚀敏感性均较小，且焊缝在硫酸中的耐腐蚀性能仅略低于母材的。

Tungsten argon arc welding with single-sided welding double-sided forming was conducted on S904L super austenitic stainless steel pipe with dimension of 60 mm×3 mm. The microstructure, mechanical properties, corrosion resistance of the joint were analyzed. The results show that there were no pore, overlap, dent and undercut on the surface of the joint weld, and there were no crack, incomplete fusion, lack of penetration inside weld indicating the good forming performance of the weld. The microstructure of weld consisted of columnar grains and equiaxed grains, and the microstructures of heat affected zone and base metal were both anstenite. The tensile strength of the joint was not lower than 525 MPa, and the joint fractured at the heat affected zone; the fracture type was ductile fracture. No cracks were observed on surfaces of face bending and back bending samples after 180° bending, and the results met the standard requirement. The micro-hardness of the heat affected zone was the highest, and followed by the weld and base metal. The intergranular corrosion sensitivity of the base metal and the weld were relatively small, and the corrosion resistance of the weld in the sulfuric acid was only slightly poorer than that of the base metal.