研究了单面供气双面成形的激光焊接Ni201板工艺，并对焊缝进行了测试与分析。结果表明，焊缝成形良好，改变槽深对焊缝熔宽影响较小，焊缝区为粗大的奥氏体组织。气孔类型检测结果表明，焊缝气孔为氧气孔，随槽深的增大氧气的质量分数呈V型变化。当槽深为3 mm时，焊缝氧气质量分数最小，接头强度为377.7 MPa，达到母材强度的80％，焊件满足使用要求。

The laser welding process of Ni201 sheet with single-sided gas supply and double-sided forming is studied, and the welds are tested and analyzed. The results show that the weld is well-formed, the influence of groove depth on weld width is weak, and the weld zone is coarse austenite structure. The result of stomatal type detection shows that the type of weld porosity is oxygen hole, and the mass fraction of oxygen versus groove depth presents a V typed change. When the groove depth is 3 mm, the oxygen mass fraction of welds is the smallest, the joint strength reaches to 377.7 MPa, which is about 80% of the base metal strength, and the welding parts meet the requirements of use.