plasma arc melting

例句：

1. 1. Plasma arc welding is a technique used in manufacturing to join metal parts together quickly and efficiently.
   等离子弧焊接是一种在制造业中用于快速且高效地连接金属部件的技术。
2. 2. The plasma arc welding process involves using a high-energy beam of electrons toheat up the workpiece and fuse it together.
   等离子弧焊接过程涉及使用高能量电子束加热工件并将其熔合在一起。
3. 3. In this case, the plasma arc welding was used to repair the damaged area on the bridge's structure.
   在这种情况下，使用了等离子弧焊接来修复桥梁结构上的损坏区域。