Operation
ORBIMAT CA
| Operating instructions
48
orbitalum tools
GmbH, D-78224 Singen, www.orbitalum.com, Tel. +49 (0) 77 31 792-0
(09.03.15) OW_ORBIMAT_CA_BA_871060202_04_EN
Pilot current
Current upon arriving at tack points. The pilot current should, on the one hand, be high enough so that the arc does not
cut out, and on the other hand low enough so that a melt pool does not form on the pipe surface.
[
Recommendation: Do
not
change pilot current.
Tack time
Duration for the readiness of the tack current when the position is reached and the rotor is not moving.
X
In case of weak tacking: Lengthen tacking time or increase tack current.
When a tacking procedure is carried out first, the starting point of welding is moved.
X
Compensate for this shift by entering an angle in the "
Start position
" field.
The angle specified for "
Start position
" is approached by the system before welding begins. By selecting
this angle accordingly, the starting point of welding is moved back to the original position.
X
Recommendation: Run procedure in test mode and check the movement of the rotor when doing so.
Fig. 23:
Ready to weld (tacking function)
8.7
Using the second gas pressure level ("flow force")
Auto programming generates gas pre purge times of 30 seconds if a closed weld head is selected.
The machine can first fill the weld head with a higher gas pressure during the gas pre purge time to reduce the time.
The gas pre purge time is the total time for filling the welding pocket before welding.
Only values which are at least 2 seconds shorter than the total gas pre purge time are possible for the flow force. This
time difference of 2 seconds is necessary so that a corresponding pressure compensation can occur in the weld head
before ignition of the arc. The increased flow speeds of the flow force also causes turbulence, which could negatively
affect stable arc ignition.
The correct value depends on the following parameters: Pressure setting on pressure reducer, pocket size, weld head
size and pipe diameter.
If oxidation occurs near the start position on the fully welded part, the potential reduction has been reached.
The oxidation indicates possible uneven gas coverage at the start of welding.
X
Determine setting values by testing.
The flow force must be activated manually. During the pre purge at increased pressure, the measuring
tube on the front of the machine does not indicate the correct value. Gas monitoring by the sensor does
not occur until the end of the time of the "second gas duct", i.e. at the start of the pressure compensa-
tion. Using this function together with open-type weld tongs has no advantage and is of no use.
