butt jointed shell coursebutt weldbutt-jointed seambutt-welded seamupset welding jointwelding seam对接: abutment; abutting joint; bu ...焊缝: soldering seam; weld bead; w ...t形对接焊缝: tee butt welding对接焊对接焊缝: butt weld凹槽对接焊缝: groove butt joints下载手机词典可随时随地查词查翻译