22
ENGLISH
4
Operation
4.1
General Information on the Applied Procedure
Electrofusion welding is characterized by thermal fusion of the outer
surface of the pipe and the inner surface of the weld fitting by heating
the heater coil incorporated into the fitting. In this process, the weld
fitting shrinks and thereby creates the contact pressure needed to carry
out the fusion of pipe and fitting surfaces. The automatic welding unit
provides the electrical energy needed to perform this and control the
energy supply according to certain parameters, such as ambient tempera-
ture.
4.2
Preparing the Welding Process
In all cases, the relevant information supplied by the manufacturer of the
pipes and the fittings have to be respected. First, both pipe butt have to
be cut at right angles and level using appropriate tools. Then, using a
chamfering and peeling tool or a handheld scraper, chamfer the edge and
smoothen the pipe surface up to the length it will be inserted into the
fitting. Then, the weld surface that is achieved by this process has to be
de-fatted using an appropriate solvent (non-fibrous paper, spirit or suit-
able alcohol). Make sure nobody touches the cleansed surface and secure
pipe and fitting for the welding operation.
4.3
Turning the Welding Unit On
After connecting the power supply cord to 230V mains power, turn the
welding unit on using the main switch. The unit then performs an auto-
test. All three LEDs are on briefly simultaneously to indicate that the unit
is ready for operation. Furthermore, the seven-segment characters show
the welding mode H0 for approximately 1 second. After this, both the
LEDs and the screen characters change back to off.
4.4
Connecting the Electro fusion Fitting
Connect the connection terminals to the fitting and check for proper
contact. The contact surfaces of the connection terminals and the fitting
have to be clean. Dirty contacts may lead to improper welding and also to
overheated and fused connection terminals.
After the fitting was connected, the yellow LED (Fitting connected) is on.
At the same time, the screen displays the welding time. By pressing the
START key, the welding process can now be started.
The welding time is counted down from about 80 s. To determine the
welding duration that will be needed, the ambient temperature is taken
into consideration to some extent, which may result in a welding time
slightly longer or shorter than 80 s.
H0
80
