I In order to connect low-activation ferritic/martensitic (RAFM) steel and 316LN austenitic stainless steel, two different methods of laser welding and tungsten inert gas shielded (TIG) one were selected to weld the test parts, and the quality of the welded parts was tested. Phase composition and microstructure characterization of the welding seam were performed by XRD, metallographic microscope, and SEM analysis of the micro-zone of the welds. The mechanical properties of the welds were tested using a Vickers hardness tester and an electronic universal testing machine. The results show that both welding methods have no macroscopic defects, however micro-porosity and carbides were observed under SEM. The tensile strength of the laser weldment is 597.32 MPa, and the elongation of the fracture surface is 39.16%. The tensile strength of the TIG weldment is 603.19 MPa, and the elongation of the fracture surface is 33.72%. Combined with the welding process and the comprehensive comparison of the performance of the weldments, laser welding is recommended as the preferred option in the field welding scheme for blanket components.

Reduced activation steel, Austenitic stainless steel, Laser welding, Tungsten inert gas shielded welding

为了连接包层结构材料低活化铁素体/马氏体(RAFM)钢和 316LN 奥氏体不锈钢，选择了激光焊与钨极惰性气体保护(TIG)焊 2 种不同的工艺方式对试件进行了焊接，并对焊接件进行了质量检测。通过对焊缝微区进行 XRD、金相显微和 SEM 分析，表征了焊缝区域的相成分和微观组织，并利用维氏硬度仪和电子万能试验机测试了焊件的力学性能。结果表明，2 种焊接方式均无宏观缺陷，但在 SEM 下均可以观察到微观气孔和碳化物的存在；激光焊件的抗拉强度为 597.32 MPa，断面伸长率为 39.16%，TIG 焊件的抗拉强度为 603.19 MPa，断面伸长率为 33.72%。结合焊接工艺和焊件性能综合比较，推荐激光焊为包层部件现场焊接方案的首选方案。

低活化钢, 奥氏体不锈钢, 激光焊, 钨极惰性气体保护焊