Change-Over Stage; Joining And Cooling Stage; End Of Welding; Logging Welding Processes In A Report (Optional) - HURNER Hydr. 355 2.0 Manual De Instrucciones

4.3.5

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.
4.3.6

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
crease. Watch the value on the gauge. Building the joining
pressure must correspond to a linearly increasing ramp and
its duration must neither be longer nor shorter than indi-
cated for your welding situation in the welding value tables
in the Appendix at t
Once the joining pressure is reached and has stabilized at
P + P , depending on the applicable welding standard, the
5 t
pressure will either be kept at this level until the end of the
joining/cooling stage is reached (t
duced after 10 seconds to one-third of P
pressure will be kept until the end of the stage t
stage, the new joint also starts cooling down. If the pressure
has to be reduced in the course of the joining/cooling stage
(under the WIS standard or the UNI standard for PE 100 with
walls thicker than 20 mm), reducing the pressure is done
with the pressure release valve on the hydraulic unit.
Pipe and fitting manufacturers may include data on how
long the new joint should not be exposed to external strain.
Also, the applicable welding standard may require a mini-
mum cool-on time (t
ever, t is not relevant to the welder.
6
4.3.7

End of Welding

The welding is finished at the end of a successful joining
and cooling stage. The welder has to shut the pressure off
from the pipes using pressure release valve.
4.4

Logging Welding Processes in a Report (optional)

As an option, the butt-welding systems of the Manual Hy-
draulic series offer the possibility to log welding and trace-
ability data of every joint and to save them to a welding
report.
All it takes is the connection of a HÜRNER Data Logging/
16
EN
+ P ) according to a consistent in-
5 t
.
4
), or pressure will be re-
5
in the diagram). In most cases, how-
6
HÜRNER Manual Hydr. 355 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
) must not be
3
and the reduced
5
. In this
5
Nieder-Ohmener Str. 26
35325 Mücke, Germany
Version October 2021