Taking Ti, Si and Te as activating fluxes, the effect of single element on the formation of weld of mild steel made with DCSP A-TIG was studied. The reason of influence of single elements on weld penetration was discussed.

• 以Ti粉、Si粉和Te粉作为活性剂；研究了单质对低碳钢直流正接A-TIG焊焊缝成形的影响；分析了单质影响熔深的机理.