短語詞組短語welding -seam cleaner 焊縫清理機;焊縫清算機butt welding seam 對接焊縫longitudinal welding seam 縱向焊縫welding seam tracking 焊縫跟蹤welding seam image 焊縫圖像welding seam traking 焊縫視覺跟蹤main welding seam 主焊縫welding seam size 焊縫膠 返回 welding seam