Hürner WeldControl EF 250 Manuel Utilisateur page 47

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level. Facing is stopped by moving the carriage apart with the car-
riage mover lever.
If you discover after the facing process that the butts are still not level,
start over, insert the facing tool and repeat the process. When facing
is properly done, pipe alignment has to be checked.
The facing process is shown on the display screen (see Display 17). The
START/SET key has to be pressed by the welder to confirm that facing
is properly finished.
4.3.2 Checking Pipe Alignment and Determining Drag Pressure
When the pipes are properly faced, close in the movable carriage
completely to check whether a potential vertical and horizontal pipe
misalignment is within the tolerance allowed by the applicable welding
standard. The maximum acceptable gap between them is displayed (see
Display 18). If pipe alignment is in order, the welding proper can start.
If the misalignment is outside tolerance, the pipes must be readjusted
in the clamps and, if needed, facing has to be repeated.
When pipe alignment is appropriate, move the carriage apart using
the carriage mover lever; make sure the movable carriage is as far
apart as possible before continuing. Turn the maximum pressure regu-
lator counter-clockwise as far as it will go to have zero pressure in
the hydraulic circuit. Then set the carriage mover lever to its close-in
position while simultaneously turning the maximum pressure regula-
tor gradually clockwise. Watch the display closely to observe at which
pressure level the carriage is "dragged" to start moving.
The START/SET key has to be pressed when the carriage starts moving,
in order to save the drag pressure applicable to this welding to
memory.
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 20 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 20 and 21), 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 and the alphanumeric keys. 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 that allows 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
Version January 2018 HÜRNER WeldControl EF 250 User's Manual
Check Pipe Alignment
Max. Gap :2.5mm
Display 18
Set Drag Pressure
230°C ACT. 3.5bar
Display 19
Buildup pr.:030.5bar
Heatsoakpr.:010.5bar
Heatsoaking:0120 s
Change-over:0005 s
Display 20
Cool. time :900 s
Press. ramp:010 s
Plate temp.:223 °C
Display 21
EN
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