短語詞組短語pipe rolling welder 卷管焊接工automatic heat pipe joint welder 熱管接頭自動(dòng)焊機(jī)elbow pipe welder 彎頭焊接機(jī)all position pipe welder 全位置管焊機(jī)pipe girth joint welder 管道環(huán)縫焊工orbital pipe welder 管子環(huán)縫自動(dòng)焊機(jī)galvanized welder steel pipe 鍍鋅鋼管 返回 pipe welder