welding grade shield gas

例句：

1. 1.The welding process requires the use of a specific type of shield gas to protect the welding joint from contamination.
   焊接过程需要使用特定的保护气体来保护焊接接头免受污染。
2. 2. During the welding process, the shield gas is used to block out any oxidizingagents that could damage the weld bead.
   在焊接过程中，保护气体被用来阻挡任何可能损害焊缝的氧化剂。
3. 3. The quality of the shield gas can significantly impact the strength and durability of the welded joint.
   保护气体的质量可以显著影响焊缝的强度和耐久性。