semi-automatic metal arc welding

例句：

1. 1. This semi-automatic metalarc welding machine is veryefficient in cutting steel plates.
   这台半自动金属电弧焊机在切割钢板时非常高效。
2. 2. The engineer used asemi-automatic metal arc welding technique to repair the damaged partof the bridge.
   工程师使用了一种半自动金属电弧焊技术来修复桥梁受损的部分。
3. 3. The construction company hired a professionalto perform semi-automatic metalarc welding on the new building's exterior.
   建筑公司聘请了一位专业人士对新建筑的外墙进行半自动金属电弧焊。