短語詞組短語up slope weld 立坡焊stwind up asautying weld tstomach 引弧板backed up weld 后托焊接build -up weld 堆焊技術vertical up weld 垂直焊縫built -up weld 堆焊backed -up weld 后托焊接weld up 焊補;填焊;焊住;焊封weld set up 焊接部件 返回 up weld