welding grade gas 焊接级保护气体 ; 焊接级气体

welding-grade argon 焊接级用氩 ; 烧焊级用氩

welding grade shield gas 焊接级保护气体

welding-grade helium 焊接级氦

high grade energy welding 高能焊

welding quality grade 焊缝质量等级

grade of welding consumable 焊缝材料级别