Heating Stage - Hürner WeldControl EF 355 Manuel Utilisateur

will be reached during the process, in the bead build-up stage and at
the end of the joining stage). This is done by pushing the mover lever
to its close-in position and setting the maximum pressure regulator
to the level to be kept during bead build-up and joining/cooling. The
actual pressure shows (see Display 22) and the control software moves
on to the next step as soon as the pressure is within tolerance.
The display also shows the nominal joining pressure applicable to this
welding. After setting the joining pressure, move apart the carriage
of the machine.
The so-called automode is a tool for monitoring the duration
of the bead build-up stage and moving on automatically from
the bead build-up to the heating stage by decreasing the
applied pressure. However, this requires that the automode
Info
was enabled in the Configuration Menu. Then, with enabled
automode, Display 23 is shown. Then, to use that bead build-
up time saved at the last welding operation, press START/
SET. Pressing STOP/RESET will cancel the automode for bead
build-up. If the bead build-up is automode-managed, the
build-up time is displayed as a countdown, and from 10 sec
prior to decreasing the pressure, the audible signal can be
heard.
At the start of the bead build-up stage, place the heating element
between the pipe butts. The display tells you so. If the heating ele-
ment is not sufficiently hot at this point, an information message on
the screen asks you to wait a little longer.
Then close in the movable carriage by pushing the carriage mover
lever and wait for the weld bead to reach the required height or
width, depending on the used welding standard. Observing the bead
is also highly recommended in the automode, even though the bead
height is not indicated on the screen during an automode-managed
bead build-up stage.

4.3.5 Heating Stage

After the bead build-up stage (1
control unit) was completed, pressure must be decreased (2
the diagram). The decreased pressure will then be applied for the
entire duration of the heaing stage (3
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.
20
EN
LED in the welding diagram on the
st
LED in the diagram), in which
rd
HÜRNER WeldControl EF 355 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
Set Joining Pressure
230°C NOM.
229°C ACT.
**** AUTOMODE
Use last bead
build-up time?
RESET
Put in heat. plate
222°C NOM.
221°C ACT.
Bead Height
Bead Build Time:68 s
230°C NOM.
LED in
nd
229°C ACT.
HEAT SOAK PHASE
Heat Soak Time :148s
230°C MAX
229°C ACT.
Version January 2018
16.5bar
3.5bar
Display 22
****
SET
Display 23
16.5bar
0.5bar
Display 24
:2.0mm
16.5bar
12.5bar
Display 25
5.0bar
3.5bar
Display 26