短语词组短語up slope weld 立坡銲stwind up asautying weld tstomach 引弧板backed up weld 後托銲接build -up weld 堆銲技術vertical up weld 垂直銲縫built -up weld 堆銲backed -up weld 後托銲接weld up 銲補;填銲;銲住;銲封weld set up 銲接部件 返回 up weld