undercut weld

例句：

1. 1. The engineer used a special tool toundercut the weld and improve thestrength of the joint.
   这位工程师使用一种特殊的工具来下切焊缝，以提高接头的强度。
2. 2. Undercut welding is atechnique that involves cutting away the outerlayer of metal before welding,which can reduce the risk of hot cracking.
   下切焊接是一种技术，它涉及在焊接之前切除金属的外层，这可以减少热裂纹的风险。
3. 3. Inthis project, the undercut welding method was used to join two piecesof steel together, resulting in a strongerand more durable joint.
   在这个项目中，下切焊接方法被用来将两块钢材连接在一起，得到了一个更强大、更耐用的接头。