短语词组短語weld set up 銲接部件weld back -up 銲縫背墊weld face cleaning up clean 銲接麪清理乾淨;銲接麪清理清潔;韋爾德麪對清理乾淨up weld 上曏銲weld seam fit -up 銲縫組對backed up weld 後托銲接build -up weld 堆銲技術vertical up weld 垂直銲縫sideal weld metal build -up 額外堆銲的銲縫金屬 返回 weld up