短语词组短语Butt Welding Neck Flange 带颈对焊法兰raised face welding neck flange 凸面对焊法烂;凸面对焊法兰Steel pipe welding neck flange 带颈对焊钢制管法兰ring joint welding neck flange 环槽式密封面对焊法兰;环槽式弥缝面临焊法兰;梯形槽式密封面对焊法兰 返回 welding neck flange