white hdpe Pipe:1,materials:100% pe; 2,dn:20-1000mm; ... clean. 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 through the ... , the fast one has not inserted the pipe whirlingly on the pipe fittings, connect the place and forming the ...