electric welding rod

例句：

1. 1. The electric welding rod is used to connect two pieces of metal together.
   电焊焊条用于将两块金属连接在一起。
2. 2. The welding rod needs to be heated before it can be used for welding.
   焊条在使用前需要加热。
3. 3. The welding rod was made from a high-quality steel material.
   焊条是由高质量的钢材制成的。