white hdpe Pipe:1,materials:100% pe; 2,dn:20 ... welding on the pipe. 2. Heat melts the welding machine to prepare: According to installing the pipe specification, assemble ... mould hair of welder reach the suitable density for pipe fittings to insert, heating after the time to ... pipe whirlingly on the pipe fittings, connect the place and forming the even flange, keep 2-5s, natural cooling. white hdpe Pipe ...