短语词组短语weld bridge seam 桥接焊缝;搭桥焊缝;建桥焊缝weld -seam heat-treatment 焊缝热处理longitudinal weld longitudinal seam 纵向焊缝bridge weld seam 盖板焊缝of longitudinal weld seam 经向错皮weld seam metal 焊缝金属weld seam detecting 焊缝检查 返回 weld seam