Change-Over Stage; Joining And Cooling Stage - HURNER WeldControl 2.0 1200 Manual De Instrucciones

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the diagram). The decreased pressure will then be applied for the
entire duration of the heat-soaking stage (3
which the pipe butts continue to soak heat from the plate.
When the bead build-up stage is not automode-managed, the pressure
is decreased either with the manual pressure release valve or with the
START/SET key, and the decrease has to be observed on the display.
When the START/SET key is used, the hydraulic and control unit keeps
the heating pressure below the required maximum throughout the
heating stage by re-opening the release valve as needed if the pres-
sure rises. If the welder uses the pressure release valve, this automatic
control is not available. In this case, it is under the operator's respon-
sibility to compensate for potential pressure fluctuations.
The machine also moves on to the heating stage if the welder decreases
the pressure to a level below the heat-soaking maximum before the
countdown of the bead build-up stage is completely over – which
may happen if the bead is o.k. earlier than expected. However, such
a pressure decrease has to be quick. In these cases, the bead build-up
time shortened 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 between the
heating plate and the bead, even with lower pressure. While
Important
heating, if contact between them is lost somewhere along the
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.
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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
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cooling down.
Right after the end of the linear pressure ramp, at the very
beginning of the cooling, pressure may drop slightly for
Important
Version July 2020
LED in the diagram), in
rd
HÜRNER WeldControl 2.0 1200 User's Manual
HEAT SOAK PHASE
Heat Soak Time :148s
230°C MAX 5.0bar
229°C ACT. 3.5bar
Display 26
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
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