upset welding joint

例句：

1. 1. The engineer inspected the welding joint to ensure its stability.
   工程师检查了焊接接头，以确保其稳定性。
2. 2.The welding process was interrupted due to the unstable welding joint.
   由于焊接接头不稳定，焊接过程被中断。
3. 3. The engineer used a special tool to repair the unstable welding joint.
   工程师使用一种特殊的工具来修复不稳定的焊接接头。