焊条

例句：

1. 1. The welding process involves heating and joining metal together.
   焊接过程涉及加热并使金属结合在一起。
2. 2. The steel wire is the main material for making welds.
   钢线是制作焊缝的主要材料。
3. 3.The welder carefully controls the heat to ensure a strong joint.
   焊工仔细控制热量以确保牢固的连接。