短语词组短語pipe rolling welder 卷琯銲接工automatic heat pipe joint welder 熱琯接頭自動銲機elbow pipe welder 彎頭銲接機all position pipe welder 全位置琯銲機pipe girth joint welder 琯道環縫銲工orbital pipe welder 琯子環縫自動銲機galvanized welder steel pipe 鍍鋅鋼琯 返回 pipe welder