your running 10 ga wire to a 50 amp outlet on a 50 amp breaker?
10 ga wire is good for 30 amps in a residential application
your hobart 180 will run on a 30 amp breaker, i'd change out the breaker asap
it may work for now or it may go up in smoke and take your shop with it
your hobart 180 is rated at 20 amps according to the specs
http://www.hobartwelders.com/pdf/spe...andler_180.pdf
you could run a 12 ga cord out there, but use 10 ga to be safe if you change the breaker to 30 amp
if you throw a 20 amp breaker in there you could buy a 12 ga extension cord