The inductor serves a complementary purpose, it smooths out the current flow in a similar fashion to how the capacitor smooths out the voltage.
Yes, copy the value from the Hobart schematic as a starting point. You don't have to buy this from Hobart, I'm sure you can get it much cheaper from a source such as
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. Be sure to match both the capacitance value and voltage rating. If you get this wrong the capacitor might blow up, but hey, you're experimenting, sometimes you have to make a little smoke.
Its nice not to have to worry about accidental arcs and flashes, once you use a machine with a contactor you won't want to go back.
Yes, if you improve the air flow to the case you can improve the duty cycle. Doing this the right way takes a little research but if you search around the web I'm sure you can find some info on it, first figure out the difference between a fan and a blower and which would be better in this situation.
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