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pigfarmer

tall, thin, irritable
3/8" ... that is not really in the limits of any wire welder, you need a stick welder for that.
welding the exhaust pipes or any thin tubing needs the wire welder,
flux core welding is pretty clean if you don't make a mess or make a cold weld.
I have welded 1/4 inch with the wire welder, but mostly just tacks where I can leave it in one spot and let it heat up, so, seems like you need 2 welders...

Not that you're holding your breath in anticipation, but after much self-torture I'm going to wait until Spring and grab a Harbor Freight Flux 125 on one of their parking lot sales for a hundred bucks or less. I have a couple of ideas and figure the 'right' one is the one you got and can't afford to spend a fortune on a better welder I might not even use.
 
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