Eutectic+Castolin TotalARC 2 3000 - Page 38

38
Torch operating modes
N.B.! For information on how to set the available parameters,
and on the setting range and units of these parameters, please
see the section headed "The set-up menu".
2-step mode
2-step operation is suitable for
- tacking-jobs
- short weld-seams
- Automatic and robot welding
4-step mode
4-step mode is suitable for longer weld seams.
4-step mode (aluminium)
The "4-step mode (aluminium)" is particularly suitable for
welding aluminium materials. The special pattern of the current
curve takes account of the high thermal conductivity of alumi-
nium:
- Starting current (I-S): For rapid heating-up of the base
metal, despite the high thermal dissipation at the start of
welding
- Slope (SL): The starting current is continuously lowered
down as far as the welding current
- Welding current: For an even, uniform thermal input into
the base metal, which is heated up by advancing heat
- Slope (SL): The welding current is continuously lowered
down as far as the final current
- Final current (I-E): By preventing local overheating of the
base metal by heat build-ups towards the end of welding,
this eliminates any risk of weld drop-through.
Fig.7c 4-step mode (aluminium)
Press and hold the torch trigger
Release the torch trigger
Fig.7a 2-step mode
Press and hold the torch trigger
Release the torch trigger
I
t
Press the torch trigger
Release the torch trigger
Welding current
Gas pre-flow time (GPr)
Gas post-flow time (GPo)
Fig.7b 4-step mode
I
t
Welding current
Gasv pre-flow time (GPr)
Gas post-flow time (GPo)
I
t
Welding current
Gas pre-flow time (GPr)
Gas post-flow time (GPo)
Starting current (I-S)
Slope (SL)
End current (I-E)
Slope (SL)