Castolin Eutectic totalarc2 3000, Руководство по эксплуатации, Страница: 40 / 161

40
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 wel-
ding 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
phase
Gas
pre-flow
time
(GPr)
Gas
post-flow
time
(GPo)
Fig.7b 4-step mode
I
t
Welding
current
phase
Gasv
pre-flow
time
(GPr)
Gas
post-flow
time
(GPo)
I
t
Welding
current
phase
Gas
pre-flow
time
(GPr)
Gas
post-flow
time
(GPo)
Starting
current
phase
(I-S)
Slope
(SL)
End
current
phase
(I-E)
Slope
(SL)