Abstract: For the in-vessel stud welding of HL-2M vacuum vessel, this paper introduces a detailed study on 
the structure design of welding stud, welding process scheme, welding process test, welding quality evaluation, 
etc. Finally, the welding parameters including welding current, welding time, extension length, lifting height, total 
lifting height and other welding parameters, as well as the position of grounding and the direction of welding 
torch are determined. Through a large number of process tests, the welding problem of HL-2M vacuum vessel 
wall (5mm, Inconel625 material) - large diameter stud (∅12mm, 316L) has been solved effectively. The weld has 
uniform shape, less spatter and weld bead, and the surface blackening is obviously improved, which meets the 
requirements of vacuum cleanliness; moreover, the welding stability and yield are relatively high, and the tensile 
test and fatigue test also meet the design requirements.

Key words: Vacuum vessel, Thin plate, Large diameter, Stud welding, Welding process 

 

摘要： 针对 HL-2M 真空室内壁螺柱焊接，从焊接螺柱结构设计、焊接工艺研究、焊接工艺试验、焊接质量
评判等方面进行了详细研究，最终确定了包括焊接电流、焊接时间、伸出长度、提升高度、总提升高度等焊接参
数和接地线位置、焊枪手把方向的真空室内壁螺柱焊接工艺方案。通过大量工艺试验，有效地解决了 HL-2M 真
空室内壁(5mm，Inconel625 材质)-大直径(∅12mm，316L 材质)螺柱焊难题，焊缝成型均匀，飞溅和焊瘤少，表面
发黑明显改善，满足真空清洁度要求。焊接稳定性高，良品率高，拉伸试验和疲劳试验也满足设计要求。 

关键词: 真空室, 薄板, 大直径, 螺柱焊, 焊接工艺