短语词组短语weld set up 焊接部件weld back -up 焊缝背垫weld face cleaning up clean 焊接面清理干净;焊接面清理清洁;韦尔德面对清理干净up weld 上向焊weld seam fit -up 焊缝组对backed up weld 后托焊接build -up weld 堆焊技术vertical up weld 垂直焊缝sideal weld metal build -up 额外堆焊的焊缝金属 返回 weld up