Follow carefully the order of working steps! Preparation is one of the most important steps of the electro fusion process!
Without complete peeling of the surface in the fusion area, you will not achieve a homogeneous and tight welding connection.
Injuries of the surface like axial grooves and scratches are not accepted in the fusion zone.
Do not touch peeled surfaces and protect them against dirt and grease. Start the fusion process within 30 mins after peeling!
The fusiotherm®-electro-fusion device was especially developed for electrofusion sockets from Ø 20 - 160 mm.
Cleanliness is - besides correct workmanship - the most important precondition for fusions. To assure the cleanliness of the fittings do not unwrap these before processing!
Principle: Avoid contamination carefully and fix all parts securely!
Pipes must leave, free from tension or own weight, within the fusiotherm®-electro socket.The socket has to be movable at both pipe ends after assembling. The air gap has to be even around the circumference. A not stress free resp. displaced connection can effect an unacceptable melt-flow and a defective connection. Suitable measurements have to ensure that during the complete fusionprocess (including cooling) the pipes are aligned correctly, no outer forces may effect on the welding and that the pipes cannot move. The pipe ends and the electro sockets have to be dry on assembling. If there are any doubts referring the cleanliness and dryness of the fusiotherm®-electro socket, the inner surface has to be cleaned and dried: aquatherm®-cleansing clothes are well suitable.
Do not move or stress pipe and fitting during the whole fusion process including cooling time.
A fused pipe-joint shall not be moved, stressed or loosed before complete cooling. The minimum cooling time is marked on each fusiotherm®-electro socket. Environmental temperatures of more than 25 °C or strong sun-radiation need longer cooling times.
Pressure tests shall be made only after complete cooling, i.e. one hour after the end of the cooling time of the last fusion-joint. If temperature is more than 25° C, please wait for 1.5 to 2 hours.
fusiotherm®-electrofusion sockets correspond to the pressure of PN 20. The relation between working temperature, pressure load and service life is given in the tables "Permissible working pressure."
For further information concerning the electrofusion socket and details about the fusiotherm®-electrofusion device please ask for operating instructions.
Kind of stress
Minimum waiting period
Tension, bend, torsion of
test- or working pressure of pipes under pressure
to 0,1 bar
0.1 to 1 bar
over 1 bar
Repeating of the welding process