white hdpe Pipe:1,materials:100% pe; 2,dn:20-1000mm; PE-RT underground ... Establish the suitable length of welding on the pipe. 2. Heat melts the welding machine to ... prepare: According to installing the pipe specification, assemble heat melting device well, put ... pipe whirlingly on the pipe fittings, connect the place and forming the even flange, keep 2-5s, natural cooling. white hdpe Pipe ...