non shielded arc welding

例句：

1. 1. The construction of the bridge involved the use of non-shielded arc welding techniques.
   建造这座桥梁时使用了非屏蔽电弧焊接技术。
2. 2.The engineers used non-shielded arc welding to reinforce the steel beams.
   工程师们使用非屏蔽电弧焊接来加固钢梁。
3. 3.Non-shielded arc welding is a faster and more efficient method for joining metal parts.
   非屏蔽电弧焊接是一种更快、更有效的金属部件连接方法。