AC arc welder

例句：

1. 1. The construction crewused a 300-ton arc welder to reinforce the foundation.
   建筑队使用一台重达300吨的弧焊机加固地基。
2. 2. The engineers were tasked with installing new arc welders at the construction site.
   工程师们被指派在施工现场安装新的弧焊机。
3. 3.The arc welder was used to join metal sheets together quickly and efficiently.
   弧焊机被用来快速而有效地将金属板材连接在一起。