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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 welding situation in the tables
in the Appendix (t
) must not be exceeded. If it is, welding has to be
3
aborted and repeated.
4.3.6 Joining and Cooling Phase
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
+ P
) according to a consistent increase. Watch the reading of the
5
t
gauge. Building the joining pressure must correspond to a linearly
increasing ramp and its duration must neither be longer nor shorter
than indicated for your welding situation in the welding value tables
in the Appendix at t
.
4
Once the joining pressure is reached and has stabilized at P
pending on the applicable welding standard, the pressure will either
be kept at this level until the end of the joining stage is reached (t
or pressure will be reduced after 10 seconds to one-third of P
reduced pressure will be kept until the end of the stage t
Towards the end of the joining stage, the new joint also starts cooling
down. If the pressure has to be reduced in the course of the joining
stage (under the WIS standard or the UNI standard for PE100 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 minimum cool-on time (t
gram). In most cases, however, t
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
the pressure release valve.
4.4
Data Logging/Welding Report Generation (optional)
As an option, the butt-welding machines of the Manual series offer
the possibility to log welding and traceability data of every joint and
to save them to a welding report.
All it takes is the connection of a HÜRNER Data Logging/Report Gen-
eration Unit of the SPG series to the machine. A model version with a
support bracket and connection ports for the data logger is available
upon request.
5
Indication of Errors Related to the Heating Element
Error indications that may appear on the 7-segment display are com-
posed of the letter "E" and a code number. When an error is cleared
while the machine is still running and provided the cleared error was
the only one that occurred, the machine changes back to control
mode. No machine re-start is needed. As soon as an error condition is
Version October 2020
is not relevant to the welder.
6
HÜRNER Manual Hydr. 630 User's Manual
+ P
, de-
5
t
),
5
and the
5
is reached.
5
in the dia-
6
13
EN
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