Joining And Cooling Stage; End Of Welding; Fully Manual Butt-Welding Process - Hürner HWT 400–WeldControl Bedienungsanleitung

The change-over has to be followed immediately by the joining stage.
The change-over time given on the display must not be exceeded. If
it is, the welding is aborted automatically and an error is displayed.

4.3.7 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 build the joining pressure.
Watch the value on the screen. Building the joining pressure must
correspond to a linear increase (t
as predicted by the nominal values on the screen.
Once the joining pressure is reached and has stabilized, the pressure
will be kept at this level until the end of the joining/cooling stage (t
the diagram). In this stage, the new joint already starts cooling down.
Right after the end of the linear pressure ramp, at the very
beginning of the cooling, pressure may drop slightly for
Important
technical reasons. The welder has to compensate for this drop
immediately by pushing the carriage mover lever. In this case,
the first line of Display 27 reads, "Keep the pressure."
Depending on the welding standard used or on information provided
by the pipe or fitting manufacturer, a cool-on time may be required
during which the new joint must not be exposed to external forces.
This, however, is not monitored by the hydraulic, control, and data
logging unit, for which the welding has to be considered finished
when the 7 LED is lit.
th

4.3.8 End of Welding

The welding is finished at the end of the successful joining and cooling
stage. The machine releases the pressure on the pipes automatically.
4.4

Fully Manual Butt-welding Process

When you want to weld fully manually, the machine has to
be switched to Manual Mode. To do so, press the ï and ð
arrow keys simultaneously while "Next Welding" is showing
on the screen. In the manual mode, the display screen looks
Info
like what Display 30 shows.
In a fully manual welding process, installing the appropriate master
clamping assemblies and, possibly, reducer inserts, component facing,
component alignment check, determination of the pressure to "drag"
the carriage along and of the joining pressure (i.e., the maximum pres-
sure of the welding, reached during bead build-up and joining) have
to be performed in the exact same way as in the WeldControl Mode
(see the relevant sub-sections of Section 4.3). The only difference is
that the display does not provide any hints as to what to do. It just
works as a digital gauge indicating the actual pressure applied to the
components (see Display 30). It also shows the nominal temperature
the welder has to set and the actual temperature of the heating ele-
ment, and it monitors and controls the temperature throughout the
process. The parameters for proper welding have to be looked up in
the welding value tables in the appendix.
The farther the carriage mover lever is pushed to the left, the
faster the carriage closes in and the faster pressure increases.
The farther it is pushed to the right, the faster the carriage of
the machine moves apart, and the faster pressure decreases.
Info
24
EN
in the welding process diagram),
4
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
Nieder-Ohmener Str. 26
35325 Mücke, Germany
COOLING PHASE
Cooling time :1234s
230°C NOM.
229°C ACT.
COOLING PHASE
Cooling time over
in
5
229°C ACT.
*** MANUAL MODE ***
220°C NOM. ---.-bar
219°C ACT. 016.0bar
Version January 2020
16.5bar
16.5bar
Display 28
0.0bar
Display 29
Display 30