butt welding of circumferential seam的意思|示意

环缝对接焊 butt welding of circumferential seam 环缝对接焊 butt-seam welding machine 对接缝焊机; 对接滚焊机 circular seam welding 环缝对接焊; 环缝焊接 .

环缝对焊接 螺旋缝焊接 welding of spiral seam & welding of helical seam 环缝对焊接 butt welding of circumferential seam 定位焊 tack welding ..