5 OPERATION
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5.2 Connecting welding and return cables
The power source has two outputs, a positive welding terminal (+) and a negative welding terminal (-),
for connecting welding and return cables. The output to which the welding cable is connected depends
on the welding process or type of electrode used.
• For MMA / SMAW / Stick welding, the welding cable can be connected to the positive welding
terminal (+) or negative welding terminal (-), depending on the type of electrode used. The
connection polarity is stated on the electrode packaging.
• For TIG / GTAW welding, the negative welding terminal (-) is used for the welding torch and the
positive welding terminal (+) is used for the return cable.
1) Connect the return cable to the other output on the power source.
2) Secure the return cable’s contact clamp to the workpiece, and make sure that there is a good
contact between the workpiece and the output for the return cable on the power source.
5.3 MMA / SMAW / Stick welding
MMA / SMAW / Stick welding melts the electrode as well as a local part of the
workpiece. The flux, when melting, forms a protective slag and creates a shielding gas
to protect the weld pool from atmospheric contamination.
5.4 TIG / GTAW welding
TIG / GTAW welding melts the metal of the workpiece, using an arc initiated from a
non-consuming tungsten electrode. The weld pool and electrode are protected by a
shielding gas that usually consists of an inert gas.
For TIG / GTAW welding, the welding power source shall be supplemented with:
• a TIG / GTAW torch with gas valve and accessories
• a gas hose connected to the gas supply input (threaded fitting 5/8"-18 RH (male))
• an argon gas cylinder
• an argon gas regulator
• a tungsten electrode
This power source performs Live TIG / GTAW start.
Live TIG / GTAW arc initiation
The tungsten electrode is placed against the workpiece. When lifted away from workpiece the arc is
struck at a limited current level.
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