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On selection of a large electrode:
•
The arc will burn through light metals
•
The bead will undercut the work.
•
The bead will be flat and porous.
•
The rod may stick to the work piece
(fig 2K).
Note: Rate of travel over the work piece also
affects the weld. To ensure proper penetration
and enough rod deposit, the arc must be
moved slowly and evenly along the weld seam.
Setting the amperage control
1. Use lower output settings for 1/16"
electrodes.
2. Use higher output settings for 5/64"
electrodes.
3. Set higher amperage for thick and heavy
metals.
4. Set lower amperage for light and thin
metals.
5. Try the intended weld on scrap metal to
ensure the proper amperage
determination.
Welding techniques
Holding the electrode
1. Hold the electrode in a way that is most
comfortable to work.
2. Hold the electrode perpendicular to the
work piece when striking the initial arc.
3. To allow good penetration with minimal
spatter, hold the electrode at an angle of
10°–30° between the electrode and the
work piece once the initial arc is struck.
.
fig 2K
MIG 180 INVERTER WELDER 058-9306-4
34
MC-589306-46
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