Bead Build-Up Stage; Heating Stage - Hürner 500-R Bedienungsanleitung
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The nominal temperature, at which the hydraulic and control unit
should keep the heating element, can be changed using the ñ and
ò cursor keys. After such a change, the display starts flashing and
stops flashing only when the actual temperature is equal to the new
nominal temperature.
The welder must wait for the display to stop flashing before
using the machine!
Important
The welding proper has the four stages in the diagram below that are
explained in the following sections. It is under the welder's responsi-
bility to verify the correct welding pressures and times.
Before the welding process starts, the drag pressure has to be deter-
mined with care. Move the movable carriage apart, turn the pressure
regulator counter-clockwise as far as it will go, then bring to mover
lever to the close-in position and gradually turn the pressure regula-
tor clockwise. Watch the display and note the pressure that "drags"
the carriage sufficiently to set it in motion. This is the drag pressure
P
for this welding.
t
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 above).
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
P
P
+ P
+ P
P
P
1
1
t
t
P
P
2
2
t
t
1
1
Version May 2011
in the diagram) was completed, the
1
P
P
+ P
+ P
5
5
+ P
+ P
t
t
t
t
t
t
t
t
2
2
3
3
4
4
HÜRNER WeldControl 500-R User's Manual
+ P
2
) and the heat-soaking
2
t
t
t
t
t
t
t
t
5
5
6
6
,
1
.
t
19
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