raised face welding neck flange的意思|示意

凸面对焊法烂 ... long welding neck 长高径法兰 ring joint welding neck flange 梯形槽式密封面对焊法兰 ; 环槽式密封面对焊法兰 raised face welding neck flange 凸面对焊法烂 ...

凸面对焊法兰 ... rail-end welding轨端补焊 raised face welding neck flange凸面对焊法兰 raised welding method上升焊接法 ...