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element at a pressure of P
tion given in the welding value tables in the Appendix (t
the diagram above).
4.4.2
Heating Stage
After the bead build-up stage (t
pleted, the pressure must be decreased to below or equal
to the level of P
+ P
2
applied for the entire duration of the heating stage (t
the diagram), in which the pipe butts continue to soak heat
from the plate. Use the welding value tables in the Appen-
dix to determine the heat-soaking time (t
(P2 + Pt) applicable to your welding situation.
In the Manual and in the Weld Control modes, two
ways to reduce the applied pressure are available.
Either open the pressure release valve or press the
Info
START/SET key. Pressing the START/SET key reduces
the pressure only as long as you hold the key down.
The value for the pressure in the heating stage in
the welding tables in the appendix is a maximum
that the pressure must not exceed, but may fall
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short of. In the case of welding operations with
PE 100 – RC, a recommendation even is to reduce
the heating pressure to close to 0 always and inde-
pendently of the wall thickness of the components.
Full contact has to be continuously established be-
tween the heating plate and the bead, even with
lower pressure. While heating, if contact between
Important
them is lost somewhere along the circumference,
welding has to be aborted and repeated.
4.4.3
Change-over Stage
After the end of the heating, or heat-soaking, stage, set the
carriage mover lever on the hydraulic unit to its move-apart
position in order to move the carriage to the far end. Then
remove the heating element from in-between the pipes.
The change-over has to be followed immediately by the
joining stage. The change-over time given for your weld-
ing situation in the tables in the Appendix (t
exceeded. If it is, welding has to be aborted and repeated.
4.4.4
Joining and Cooling Stage
Set the carriage mover lever to its close-in position again
in order to move the pipe butts in on each other and to
build the joining pressure (P
increase. Watch the value on the display screen. Building
the joining pressure must correspond to a linearly increas-
ing ramp and its duration must neither be longer nor short-
28
EN
+ P
for the bead build-up dura-
1
t
in the diagram) was com-
1
. The decreased pressure will then be
t
+ P
) according to a consistent
5
t
HÜRNER Weld Control 315 2.0 User's Manual
H Ü R N E R S c h w e i s s t e c h n i k G m b H
in
1
in
2
) and pressure
2
) must not be
3
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