welt coil

例句：

1. 1. The welt coil is used to hold the fabric together during the sewing process.
   焊接线圈用于在缝纫过程中固定布料。
2. 2. The welding rod was too hot to touch, which made it difficult for the welder to work.
   焊接棒太热了，无法触摸，这使得焊工难以工作。
3. 3.The welding wire was used to connect two pieces of metal together, creating a strong bond.
   焊接线被用来将两块金属连接在一起，形成牢固的结合。