Rothenberger ROWELD P 800 B Instrucciones De Uso página 22

 Press the control lever and slowly increase the milling pressure to the optimal value
(max.20bar).
An excessively high milling pressure can lead to overheating and damage to the
miller drive. When the milling drive is overloaded or at rest, raise the machine and
reduce the pressure!
 Once shavings with a thickness of < = 0.2mm are steadily exiting the milling machine, pull
the control lever and guide the machine apart.
 Turn off the milling equipment, and wait for the planing disks to stop. Remove the milling
equipment from the basic machine, and place it in the storage case.
 Bring the work pieces together, and let up on the pressure by pulling the pressure release
valve.
 Check to see that the welding surfaces are flat, parallel and axially aligned.
Should the joint surfaces show any misalignment, repeat the trimming procedure. For best re-
sults the workpiece ends should not be mismatched by more than 10% of the wall thickness and
the maximum gap between the joint surfaces no more than 0.5 mm. This recommendation does
not release you from your obligation to observe national welding guidelines. Clear away any
remaining shavings with a clean brush.
CAUTION! Do not touch the trimmed, ready to weld surfaces. Ensure that the surfaces
are free of any and all containments and foreign objects!
3.2.3 Welding
Risk of injury! Keep a safe distance from the machine when mechanically closing
clamps and moving workpieces. Keep hands, limbs and objects such as clothing,
tools etc. away from running machine!
 While moving workpiece ends to welding position, read the workpiece drag pressure from
the manometer on the hydraulic unit.
The workpiece drag pressure is the minimum amount of pressure required to set the workpiece
– depending on weight and length – in axial motion. This value must be precisely determined; it
will be necessary to engage and disengage the machine and workpieces several times and to
set the pressure adjustment valve until the machine almost comes to a standstill. Add the drag
pressure to the conformation, heat-penetration and joint pressure.
 Insert the heating plate into the basic unit between the two workpiece ends and make sure
that the heating plate's supports are seated in the notches on the take-off device.
 Engage the machine, set and maintain the required conformation pressure plus drag pres-
sure.
 As soon as sufficient bead has formed around the entire circumference of the workpiece
ends, slowly pull the pressure by slowly opening the relief valve.
 Set the pressure so that workpiece ends have uniform almost pressureless contact to the
heating plate (warm up).
 Now close the relief valve. Ensure that the workpiece ends still have contact with the heating
plate.
 After the warm-up phase, disengage workpieces, remove the heating plate and re-engage
the workpieces. Increase the pressure linear to the respective joint pressure and maintain
that pressure until the joint is fully cooled.
 Regularly check the pressure and pump it back up when necessary. If the pressure loss is
excessive, have the hydraulic system checked.
CAUTION: Press and hold the control lever for the first 20 to 100 seconds then release
(neutral switch position).
 Put the heating element back into the storage case.
 After the joint has fully cooled, slowly release the pressure by pulling the relief valve, un-
clamp the workpieces and remove from the machine.
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