The socket fusion technique consists of simultaneously heating both the external surface of the pipe end and the
internal surface of the socket fitting until the material reaches the recommended fusion temperature, inspection
of the melt pattern, insertion of the pipe end into the socket, and holding it in place until the joint cools.
Mechanical equipment is available to hold both the pipe and the fitting and should be used for sizes larger than
2" CTS to help attain the increased force required and to assist in alignment. The procedures in ASTM International F 2620
Standard Socket Fusion Joint