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earlier than expected. However, such a pressure decrease
has to be swift. In these cases, the bead build-up time short-
ened by the early decrease is saved to memory as the build-
up time for this welding and will be used as a reference for
possible automode-managed build-up stages at a later time.
Full contact has to be continuously established be-
tween the heating plate and the bead, even with
lower pressure. While heating, if contact between
Important
them is lost somewhere along the circumference,
welding has to be aborted and repeated.
If the control unit detects an error (such as insuffi-
cient pressure not readjusted by the welder or ex-
cessive heating time), it also aborts welding and dis-
plays an error message.
4.3.6
Change-over Stage
An audible signal indicates the imminent change-
over during the last 10 seconds of the heat-soaking
stage.
Info
At the end of the heating stage, push the mover lever on
the hydraulic unit to its move-apart position in order to
move the carriage apart. Then remove the heating plate
from in-between the components.
In the change-over stage, too, all relevant parameters are
shown on the screen.
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 auto-
matically 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, as
predicted by the nominal values on the screen. The 5
of the diagram on the hydraulic unit flashes.
Once the joining pressure is reached and has stabilized, the
pressure will be kept at this level until the end of the join-
ing/cooling stage (6
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 technical reasons. The welder has
Important
to compensate for this drop immediately by pushing
the carriage mover lever. In this case, the first line of
Display 28 reads, "Keep the pressure."
Version November 2022_1
LED in the diagram). In this stage, the
th
Weld Control 315 User's Manual
Remove plate
Change-over
230°C
MAX
229°C
ACT.
Build Joining Press.
230°C
NOM.
229°C
ACT.
LED
th
COOLING PHASE
Cooling time :1234s
230°C
NOM.
229°C
ACT.
:
8 s
5.0bar
3.5bar
Display 27
16.5bar
14.5bar
Display 28
16.5bar
16.5bar
Display 29
25
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