Buttfusion connection is banned for metallic conduit.
金属导管严禁对口熔焊连接。
2
This standard covers the procedures for the heat joining of pipe and fittings made from polyolefin materials utilizing either the socket or buttfusion methods.
这个标准涵盖采用承插热熔和对焊热熔方法对聚烯烃材料管道和连接件进行热连接的程序。
3
According to the different product structure, buttfusion welding process and lap seam welding process are used to respectively weld left and right half shell of upper body.