短语词组短语up slope weld 立坡焊stwind up asautying weld tstomach 引弧板backed up weld 后托焊接build -up weld 堆焊技术vertical up weld 垂直焊缝built -up weld 堆焊backed -up weld 后托焊接weld up 焊补;填焊;焊住;焊封weld set up 焊接部件 返回 up weld