welding coefficient

例句：

1. 1. The engineer used a special welding rod to join the two pieces of metal together.
   工程师使用一种特殊的焊接棒将两块金属连接在一起。
2. 2. Welding is a skill that requires years of practice and training.
   焊接是一项需要多年实践和培训的技能。
3. 3. The welding process involves heating the metal to a high temperature and then cooling it quickly to form a strong bond.
   焊接过程涉及加热金属至高温，然后迅速冷却以形成牢固的结合。