1·The molten observation hole needle (3) is arranged on the pipe fitting body so that a welding progress can be conveniently detected, and the welding quality can be controlled.
焊接熔观察孔针(3)设置在管件本体上，方便检测焊接进程，控制焊接质量。
2·We usually use elbow( bend, flange, tee, reducer) as a kind of pipe fitting.
我们常用弯头（弯管、法兰、三通、大小关）作为一种管件。
3·We usually use elbow (bend, flange, tee, reducer) as a kind of pipe fitting.
我们常用弯头(管、兰、通、小关)为一种管件。
4·Pipe fitting processing is an organic combination of machining and metal pressure processing.
管件加工是机加工和金属压力加工的有机结合。
5·The invention discloses a hammer type pipe fitting electromagnetically shaping technology and a device thereof.
本发明公开了一种管件锤击式电磁整形技术及装置。