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Full contact has to be continuously established between the
heating plate and the bead, even with lower pressure. While
heating, if contact between them is lost somewhere along the
Important
circumference, welding has to be aborted and repeated.
If the control unit detects an error (such as insufficient pres-
sure not readjusted by the welder or excessive heating time),
it also aborts welding and displays an error message.
4.3.6 Change-over Stage
An audible signal indicates the imminent change-over
d u r i n g t h e l a s t 1 0 s e c o n d s o f t h e h e a t - s o a k i n g
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 pipes.
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 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 cor-
respond to a linear increase, as predicted by the nominal values on the
screen. The 5
LED of the diagram on the hydraulic unit flashes.
th
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
(6
LED in the diagram). In this stage, the new joint already starts
th
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 to compensate for this drop
Important
immediately by pushing the carriage mover lever. In this case,
the first line of Display 28 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 is 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 31 shows.
Version January 2018
HÜRNER WeldControl EF 160 User's Manual
Remove plate
Change-over
:
8 s
230°C
MAX
5.0bar
229°C
ACT.
3.5bar
Display 27
Build Joining Press.
230°C
NOM.
16.5bar
229°C
ACT.
14.5bar
Display 28
COOLING PHASE
Cooling time :1234s
230°C
NOM.
16.5bar
229°C
ACT.
16.5bar
Display 29
COOLING PHASE
Cooling time over
229°C
ACT.
0.0bar
Display 30
EN
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