Checking Pipe Alignment And Determining Drag Pressure - Hürner HWT 400–WeldControl Bedienungsanleitung

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so there is no unacceptable offset. If this requires repositioning
them along their longitudinal axis, repeat steps 3 and 4 before
you continue.
6. Move the carriage apart again and reinsert the facing tool be-
tween the components, but pull the locking bolt out this time,
so the facing tool slots down into its Position 2.
7. Turn the facing tool on at its On/Off switch and close the car-
riage in at a pressure of max. 10 - 15 bar, in order to press the
component butts against the facing blades. In the case of an
unsatisfactory facing outcome, you may still have to set the pres-
sure at 5 - 10 bar higher.
The farther the carriage mover lever is pushed to the left, the
faster the carriage closes in and the faster pressure increases.
The farther it is pushed to the right, the faster the carriage of
the machine moves apart, and the faster pressure decreases.
Info
Facing should continue until shaving forms a continuous blade that
rolls twice or three times around the component ends, so the butts
are level. Use the manual pressure release regulator to lower the
pressure manually while the facing tool is trimming the components.
10. When the facing is properly finished, use the immediate-action
full release valve to release the pressure in the circuit. Wait for
the facing tool to have turned for another 1 - 2 rotations.
11. Move the carriage apart again, turn off the facing tool, and tilt
it up from in-between the carriages.
If you discover after the facing process that the butts are still not level,
start over, insert the facing tool and repeat the process, if sufficient
material at the component butt allows the defined distance traveleld
during facing. If not, start the process again at step 3 above. When
facing is properly done, component alignment has to be checked.
The facing process is shown on the display screen (see Display 16). 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 weld-
ing standard. The maximum acceptable gap between them is displayed
(see Display 17). If alignment is in order, the welding proper can start.
If the misalignment is outside tolerance, the components must be
readjusted in the clamps and, if needed, facing has to be repeated.
When component 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, and confirm by pressing START/
SET. Turn the maximum pressure regulator 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 regulator 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.
Version January 2020 HÜRNER HWT 400–WeldControl User's Manual
Facing tool position 1,
upper, for clamping the
components: carriages
touching the spacer bolts
Facing tool position 2, lower:
carriages slide over spacer
bolts at the end of facing, to
allow for moving closer in on
facing tool
Face Pipe Ends
230°C ACT. 0.5bar
Display 16
Check Pipe Alignment
Max. Gap :2.5mm
Display 17
Set Drag Pressure
230°C ACT. 3.5bar
Display 18
21
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