Butt fusion connection is banned for metallic conduit.

金属导管严禁对口熔焊连接。

youdao

Notes: 1., Asfor valves in pound unit, connection unit "f" is expressed with "w" if butt weld adopted; "f" expressed with "r" if metal ring adopted.

说明：1、对磅级制阀门如采用对接焊连接，连接单元“F”用“W”表示。如采用金属环连接“F”用“R”表示。

youdao

The invention relates to a new process method and device of flash butt welding joint in steel bar continuous connection.

本发明涉及钢筋连续连接中闪光对焊接头的一种新型处理方法和设备。

youdao