weld metal zone

例句：

1. 1. The welding process is crucial for the integrity of the joint.
   焊接过程对于接头的完整性至关重要。
2. 2. The welding machine was used to join two pieces of metal together.
   焊接机器被用来将两块金属连接在一起。
3. 3. The welding process requires precise control to avoid defects in the welded area.
   焊接过程需要精确控制以避免焊接区域的缺陷。