Possibility To Change Welding Parameters; Setting The Joining Pressure And Starting The Bead Build-Up Stage - Hürner HWT 400–WeldControl Bedienungsanleitung

The exact drag pressure depends on various conditions (pipe
size and material, position of the machine, etc.) and has to
be determined for every welding individually.
Important

4.3.3 Possibility to Change Welding Parameters

Subsequent to setting the drag pressure, Display 19 shows on the
screen, provided that manual data input is enabled in the Reporting
sub-menu of the Configuration Menu.
In both screens enabling manual input of welding parameters (Dis-
plays 19 and 20), the ï and ð cursor keys allow moving on from digit to
digit and from value to value. The selected digit of a parameter value
is changed using the ñ and ò. The START/SET key serves to confirm
the inputs. By pressing the START/SET key, you also make the control
unit go on to the next screen.
The parameters set manually are kept in memory when the
machine is turned off. Only the pressure values are computed
individually for every welding process. If the pipe parameters
change, all parameters have to be set once again. The ma-
Info
chine recognizes the change of pipe parameters and brings
the operator directly to the menu for changing them.

4.3.4 Setting the Joining Pressure and Starting the Bead Build-up Stage

After butt facing and pipe alignment check, the welding process proper
starts by setting the joining pressure (i.e., the maximum pressure that
will be reached during the process, in the bead build-up stage and
at the end of the joining stage). This is done by pressing the carriage
close-in pushbutton 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 21) 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 22 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 pressing the carriage close-in
pushbutton and keep it in that position for a short while until the pres-
sure is stable. 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
22
EN
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
Buildup pr.:030.5bar
Heatsoakpr.:010.5bar
Heatsoaking:0120 s
Change-over:0005 s
Cool. time :900
Press. ramp:010
Plate temp.:223
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.
229°C ACT.
Version January 2020
Display 19
s
s
°C
Display 20
16.5bar
3.5bar
Display 21
****
SET
Display 22
16.5bar
0.5bar
Display 23
:2.0mm
16.5bar
12.5bar
Display 24