John C.Stennis航天中心（SSC）标准（SSTD）规定了美国机械工程师学会（ASME）使用氩保护气体对ASTM A333 3级钢进行钨极气体保护焊（GTAW）的焊接工艺。

This John C. Stennis Space Center (SSC) standard (SSTD) provides for a qualified American Society of Mechanical Engineers (ASME) weld procedure for Gas Tungsten Arc Welding (GTAW) of ASTM A333, Grade 3 steel, using argon shielding gas.