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OM-880 Page 21
Stable Arc
Straight Ground
Flat
(The Dia. Of This
Flat Governs
Amperage Capacity)
Arc Wander
Point
Radial Ground
TUNGSTEN PREPARATION: IDEAL
TUNGSTEN PREPARATION: WRONG
S-0162
Figure 6-3. Tungsten Preparation
Shape tungsten electrodes on a fine grit, hard abrasive
wheel used only for tungsten shaping. Grind tungsten
electrodes so that grinding marks run lengthwise with
the electrode. These procedures reduce the possibility
of the tungsten electrode transferring foreign matter into
the weld and help reduce arc wander.
Grind the end of the tungsten electrode to a taper for a
distance of 2 to 2–1/2 electrode diameters in length. For
example, the ground surface for a 1/8 in. (3.2 mm) di-
ameter tungsten electrode should be 1/4 to 5/16 in. (6.4
to 8.0 mm) long.
For additional information, see your distributor for a
handbook on the Gas Tungsten Arc Welding (GTAW)
process.
6-5. TROUBLESHOOTING
WARNING: ELECTRIC SHOCK can kill.
• Do not touch live electrical parts.
• Stop engine, and disconnect negative (–) bat-
tery cable from battery before inspecting,
maintaining, or servicing.
MOVING PARTS can cause serious injury.
• Keep away from moving parts such as fans,
belts, and rotors.
HOT ENGINE PARTS can cause severe
burns.
• Wear protective gloves and clothing when
working on a hot engine.
MAGNETIC FIELDS FROM HIGH CUR-
RENTS can affect pacemaker operation.
• Wearers should consult with their doctor be-
fore going near arc welding, gouging, or spot
welding operations.
Troubleshooting of internal parts to be per-
formed only by qualified persons.
IMPORTANT: Before beginning any troubleshooting
procedures, check and be sure that all connections are
correct and secure and that all switches are in the proper
position.