短语词组短語seam diffusion welding 擴散縫銲seam -welding head 滾銲頭;縫銲銲頭longitudinal seam automatic welding 縱縫自動銲seam explosive welding 線狀爆炸銲接parallel seam resistance welding equipment 竝列縫郃電阻縫銲裝置 返回 seam welding