Impax IM-MULT160-K Instruction Manual page 31

MIG OPERATION
1. When proper rod is used:
a. The bead will lay smoothly over the work
without ragged edges.
b. The base metal puddle will be as deep as
the bead that rises above it.
c. The welding operation will make a crackling
sound similar to the sound of eggs frying.
2. When a rod too small is used:
a. The bead will be high and irregular.
b. The arc will be difficult to maintain.
3. When the rod is too large:
a. The arc will burn through light metals.
b. The bead will undercut the work.
c. The bead will be flat and porous.
d. Rod may be freeze or stick to work piece.
Note: Rate of travel over the work also affects
the weld. To ensure proper penetration and
enough deposit of rod, the arc must be moved
slowly and evenly along the weld seam.
IMPORTANT – Thermostatic Protection
(Duty Cycle)
This product has a rated duty cycle of 20%. The
percentage represents the welding time in a 10
minute period for example 20% means that the
welding time is 2 minutes with a rest time of 8
minutes in a ten minute period although the
actual duty cycle will depend on the amperage
used. If the welder is used for longer than the
duty cycle you may experience a temporary
current shut off. This is to protect the
transformer inside the welder from overheating.
The thicker the material being welded, the
greater the current required, therefore, the hotter
the machine will become and the quicker it will
cut out. When the windings reach performance
temperature the cut out switch will operate
illuminating the overheat indicator on the front
panel. After a few minutes the cut out switch will
reset and the welder will be ready for use.
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