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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
Nieder-Ohmener Str. 26
35325 Mücke, Germany
P
+ P
P
1
t
P
2
t
t
1
The exact drag pressure depends on various conditions (pipe
size and material, position/altitude of the machine, etc.) and
has to be determined for every welding individually. The
Important
value P
is needed to compute the bead build-up, the heat-
t
ing, and the joining pressures needed for jointing (stages t
t
, and t
in the welding diagram respectively).
2
5
4.4.1 Bead Build-up Stage
Use the welding value tables in the Appendix to look up the joining
pressure (maximum pressure to be applied during bead build-up and
joining) appropriate for your situation. Then set the maximum pres-
sure regulator to the appropriate pressure while observing the actual
pressure displayed on the screen, and move apart the carriage of the
machine. Insert the heating element (heating plate), move the carriage
in on the plate and press the pipe butts to the plate at a pressure of
P
+ P
for the bead build-up duration given in the welding value tables
1
t
in the Appendix (t
in the diagram below).
1
4.4.2 Heating Stage
After the bead build-up stage (t
pressure must be decreased to below or equal to the level of P
The decreased pressure will then be applied for the entire duration of
the heating stage (t
in the diagram), in which the pipe butts continue
2
to soak heat from the plate. Use the welding value tables in the Ap-
pendix to determine the heat-soaking time (t
pressure (P
+ P
) applicable to your welding situation.
2
t
In the Manual and in the WeldControl Modes, two ways to
reduce the applied pressure are available. Either open the
pressure release valve or press the START/SET key. Pressing
the START/SET key reduces the pressure only as long as you
Info
hold the key down.
Full contact has to be continuously established between the
heating plate and the bead, even with lower pressure. While
heating, if contact between them is lost somewhere along the
Important
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 welding situation in the tables
in the Appendix (t
) must not be exceeded. If it is, welding has to be
3
aborted and repeated.
Version July 2020
P
+ P
5
+ P
t
t
t
2
3
4
in the diagram) was completed, the
1
HÜRNER WeldControl 2.0 1200 User's Manual
t
t
t
t
5
6
+ P
2
) and the heat-soaking
2
,
1
.
t
21
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