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Heating the gears is unnecessary unless they were made out of cast iron. Or, unless you have a lower amperage welder that runs on 120v or less. any 220v+ welder with at least 100 amps would be more than sufficient for this. Also, if you were to use flux-core or metal-core you would get much much better penetration than MIG w/ sheilding gas. Also heating it without knowing how to properly compensate for your settings will most likely create undercut. If you get undercut you will mostlikely snap the welds along with a gear tooth or two.
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