Tig Welding - ESAB Heliarc 250 Instruction Manual

SECTION 3
Do not change the position of this switch while
welding.
5. Place the Tig/Stick toggle switch to its STICK
position.
6. Leave the High Frequency Selector switch in its
OFF position.
7. Place the Current Range Selector to one of the two
Current Range positions to suit your welding appli-
cations.
Do not change the position of this switch while
welding.
8. Adjust the Current Control potentiometer for the
approximate desired welding current.
9. Set the Arc Force control at 3 or 4 on the dial and
readjust as necessary to provide a softer or harder
welding arc as described in Section 3.1-L
10. Place the Power ON-OFF switch to the ON posi-
tion. This will immediately energize the power source
up to the output terminals and the electrode holder.
Commence welding by touch or scratch starting.
11. If necessary, readjust the Current Control potenti-
ometer and/or Arc Force control to obtain the exact
welding condition required.
B. TIG WELDING
1. Make the necesary welding power and service
connections as shown on the Interconnection Dia-
gram, Fig. 2-1.
2. Set the Power ON-OFF switch to the OFF position.
3. Set the Tig-Stick switch to the TIG position. Re-
member, this mode requires that a torch switch or
foot control be plugged into the Remote Control
receptacle (RCC) in order to make and break the
welding sequence.
4. Close the main (wall) disconnect switch or circuit
breaker to provide input voltage to the power source.
5. Place the Current Selector switch in AC, DCSP, or
DCRP position. The AC position is primarily used
12
for welding of aluminum and magnesium. The
DCSP position will normally be used to cover all of
the remaining metals (steel, copper, refractory,
etc.) and alloys. The DCRP position produces a
shallow weld, which makes it suitable for joining
thin sheets of metal (e.g., magnesium, foil, etc.)
ELECTRIC SHOCK CAN KILL! Do not use AC output
in damp areas, if movement is confined, or if danger
of falling exists.
Use AC output only if required for the welding pro-
cess.
Do not change the position of this switch while
welding.
6. Set the Balance control to the position which best
suits your "AC-Tig" welding condition — Remem-
ber that when using "Maximum Penetration" mode,
your duty cycle (AC welding arc time) must be
reduced (see Fig. 1-2 - Duty Cycle chart). Also
remember that for DC welding applications, this
control should always be set for "Maximum Clean-
ing".
7. Place the current Range Selector to one of the two
Current Range positions to suit your welding appli-
cation.
Do not change the position of this switch while
welding.
8. Adjust the Current Control potentiometer for the
approximate welding current desired (see Table 3-
1). Remember, that the setting placed on this
potentiometer will be the maximum current which
can be regulated from a Remote Foot or Torch
Control.
9. Depending on the type of current regulation de-
sired, place the "PANEL-REMOTE" Current Con-
trol switch (PRS) as follows:
PANEL Position -- permits full range current reg-
ulation only from the power source Current Control
potentiometer.
Table 3-1. Typical Current Ranges for
3-3
OPERATION