Sequence Of Operation; Stick Electrode/Shielded Metal Arc Welding; Tig Welding - ESAB Heliarc 252 Instruction Manual

SECTION 3
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 process.
Never, under any circumstances,
operate the power source without
its panels in place. In addition to the
safety hazard, improper cooling may
cause overheating which will damage
the internal components. Also, make
sure you are adequately protected
before you start welding -- welding
helmet, gloves, and ear protection and
safety glasses with side shields should
always be worn.
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 process.
Do not change the position of this
switch while welding.

3.2 SEQUENCE OF OPERATION

3.2.1 Stick Electrode / Shielded Metal Arc Welding
1. Connect all welding cables to workpiece and electrode holder as shown
on the Interconnection Diagram, Fig. 2-3.
2. Place the power source's Power ON-OFF and High Frequency Selector
switches to the OFF position.
3. Close the main (wall) disconnect switch or circuit breaker to provide
input voltage to the power source.
4. Place the Current Selector switch to AC, DCSP, or DCRP depending
on your welding application.
5. Leave the High Frequency Selector switch in its OFF position.
6. Adjust the Current Control potentiometer for the approximate desired
welding current.
7. Set the Arc Force control at 3 or 4 on the dial and readjust as neces-
sary to provide a softer or harder welding arc as described in Section
3.1-L
8. Place the Power ON-OFF switch to the ON position. Place the CON-
TACTOR toggle switch to the STICK (up) position. This will immediately
energize the power source up to the output terminals and the electrode
holder. Commence welding by touch or scratch starting.
9. If necessary, readjust the Current Control potentiometer and/or Arc
Force control to obtain the exact welding condition required.
3.2.2

TIG Welding

1. Make the necessary welding power and service connections as shown
on the Interconnection Diagram, Fig. 2-3.
2. Set the Power ON-OFF switch to the OFF position.
3. Set the CONTACTOR switch to the TIG or TIG REMOTE (down or
middle) position. The REMOTE position requires that a torch switch or
foot control be plugged into the Remote Control receptacle (J2) 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 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.)
27
OPERATION