Facing The Pipe Butts; Checking Pipe Alignment And Determining Drag Pressure - Hürner Weldcontrol 160-R Bedienungsanleitung

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From this display, it is possible to change the pipe parameters by
pressing the STOP/RESET key. Then the first thing is to select the pipe
material in a list; use the ñ and ò cursor keys and confirm by pressing
the START/SET key (see Display 10). Then the ï, , ñ, ò cursor keys
allow entering the diameter and the wall thickness, both confirmed by
the START/SET key (see Display 11). Instead of the wall thickness, you
may want to enter the Standard Dimension Ratio (SDR); then display
this input line instead of the wall thickness line by pressing the ï and
 simultaneously and enter the SDR value. The machine then displays
the whole set of parameters as an overview. In case there are errors,
it is possible either to enter all data once more by pressing the STOP/
RESET key, or to return to the previous step by pressing ñ and correct
the data one at a time.
If pipe codes were entered previously in the traceability data for the
joint, the machine automatically presents the welding parameters
contained in the pipe codes for confirmation.

4.3.1 Facing the Pipe Butts

To ensure that the pipe butts are level, insert the pipe facing tool be-
tween the machine carriages and turn it on. Using the carriage mover
lever on the hydraulic unit, have the movable carriage close in toward
the center in order to bring the pipes into contact with the facing tool.
Use the pressure regulator to adjust the pressure manually while the
facing tool is trimming the pipes.
The farther the carriage mover lever is pushed to the left,
the faster the carriage closes in and the faster pressure in-
creases. The farther it is pushed to the right, the faster the
carriage of the machine moves apart, and the faster pressure
Info
decreases.
Pipe facing should continue until shaving forms a continuous blade
that rolls twice or three times around the pipe ends, so the butts are
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 13). 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 14). 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-
Version April 2011 HÜRNER WeldControl 160-R User's Manual
SELECT PIPE MATERIAL
>PE80
PE100
PP
Display 10
ENTER PIPE DIMENSION
Pipe Diameter:0250mm
Wallthickness:22.7mm
Display 11
Pipe Material: PE80
Pipe Diameter:0250mm
Wallthickness:22.7mm
RESET SDR11.0 SET
Display 12
Face Pipe Ends
230°C ACT. 0.5bar
Display 13
Check Pipe Alignment
Max. Gap :2.5mm
Display 14
Set Drag Pressure
230°C ACT. 3.5bar
Display 15
EN
15