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HOT-START control dial
only effective in the electrode ignition phase.
Advantages:
o
Improved ignition even with electrodes where
ignition is normally more difficult.
o
Improved melting of the base material in the
ignition phase, meaning far fewer cold laps.
o
Considerable reduction of slag inclusions.
o
Is added to the set welding current value on a
percentage basis.
A
200
150
100
0
Fig. 21:
Ignition phase using HOT-START control.
Welding current setting 100 A
Important!
The maximum setting for the HOT-START current is au-
tomatically limited by the maximum circuit of the
machine.
Welding witout remote control unit:
The parameters for Hot-Start and arc force are pre-set
within the machine to average (mean) values (see p. 31,
"Electrode" pre-setting level).
Fig. 22:
CastoTig 3002 AC/DC as TIG Welding Unit comprising:
power source and manual welding torch
1.0
t sec
40
TIG Welding
with high-frequency ignition (HF)
WARNING! When the CastoTIG 3002 AC/DC is being
used for TIG welding, the manual electrode cable
will always be live when:
o
the mains master switch
o
the operating mode is in the
o
when the "start welding" signal has been given
from the torch trigger.
Make sure, when the manual electrode cable is not
in use, that it is either disconnected from the ma-
chine or else fastened to the machine in such a way
(insulated) that the electrode holder and the coated
electrode cannot touch any electrically conductive
or earthed parts such as the housing, gas cylinder,
workpiece etc.
Start up
o
Fit the torch with a tungsten electrode and a gas
nozzle (see the instruction manual for the torch
concerned).
o
Plug the earth cable into the current socket
latch in place firmly.
o
Connect the gas hose to the machine and the gas
pressure regulator.
o
Plug in the mains plug.
o
Switch on the mains master switch
o
Shift selector switch
LED
or
lights up.
o
Select the type of current required with selector
switch
.
o
In the AC~ mode, set the balance and AC frequency.
o
If necessary, connect a remote control unit (see
description of remote control operation on p. 32).
o
Select welding parameters (command value for main
current I
is displayed on ammeter
H
o
Open the gas cylinder valve by turning it anti-clock-
wise.
o
Pull back the torch trigger and release it
(4-step operation).
Warning!
High-frequency ignition is now switched on!
o
Turn the setscrew on the underside of the gas
pressure regulator in a clockwise direction until the
working manometer shows the required flow-rate in
litres/min.
o
Pull back and release the torch trigger once again
(= welding OFF).
Igniting the arc:
o
Make sure the welding current is switched off. Place
the electrode on the weld at the point where the arc
is to be ignited, tilt the torch backwards until the
edge of the gas nozzle is resting on the workpiece,
leaving a gap of between 2 and 3 mm between the tip
of the electrode and the workpiece (Fig. 23-a).
o
Close your visor (Fig. 23-b).
o
Switch on the welding current with the torch trigger.
o
Arc ignites without touching the workpiece.
o
Move the torch into the normal position (Fig. 23-c).
Advantage: no contamination of either the elec-
trode or the workpiece.
IMPORTANT: After ignition in AC~ and DC, the high
frequency switches off automatically.
is ON,
or
pos. and
.
into the
or
positions.
).
and
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