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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
When the welding is performed with steel master clamps,
using an optional additional cylinder that adds stability to
the master clamps is recommended if the size of the welded
components is 250 mm or larger. Install it, if you use it, on
Info
top of the clamps per the manual that ships with it. Keep
in mind that when the additional, reinforcing cylinder
is used, the pressure values from the manual of the
additional cylinder apply to the welding rather than
the values in the welding table of this manual you are
reading.
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 component butts
2
continue to soak heat from the plate. Use the welding value tables in
the Appendix to determine the heat-soaking time (t
soaking pressure (P
+ P
2
In the Manual and in the WeldControl Modes, two ways to
reduce the applied pressure are available. Either open the
manual pressure release regulator or press the immediate-
action full pressure release valve. Pressing this latter valve
Info
reduces the pressure only as long as you 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
Important
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 welding situation in the tables
in the Appendix (t
) must not be exceeded. If it is, welding has to be
3
aborted and repeated.
26
EN
in the diagram) was completed, the
1
) applicable to your welding situation.
t
HÜRNER HWT 400–WeldControl 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
,
1
+ P
.
2
t
) and the heat-
2
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