welding fabrication

例句：

1. 1.The engineer used a special welding torch to repair the damaged part.
   工程师使用一种特殊的焊接焊枪来修复损坏的部分。
2. 2.Welding is a skill that requires practice and patience.
   焊接是一项需要练习和耐心的技能。
3. 3.The welding process involves heating metal together until it melts and then resolidifies.
   焊接过程涉及将金属加热到一起直到它们熔化然后重新凝固。