I had a Campbell Hausfield 80 amp, likely similar to HF. The cheap welders are cheap because they don't work very well. The major problem is adjustability. My high quality TIG will adjust from 5 amps to 185 amps. My Hobart MIG has seven power settings versus the two settings of a cheaper one, plus a wider range of wire speed.
Steve is correct, flux core wire is messy, splatters like a mud throwing contest, and does not have a very nice arc.
Combined with a cheap welder, it is very frustrating to try to do anything with. You can try adjusting your wire speed if it is burning through, but I doubt you will ever be happy with it. Bite the bullet and get a Lincoln/Miller/Hobart gas MIG, load it with .023 wire and CO2/Argon gas, and you will be much happier with the results.
Here is a good website for welder discussions:
http://www.hobartwelders.com/weldtalkThe local auction folks were selling off a body shop and had a miller and a lincoln 110VAC welders with carts and bottles. Probably well used, but if the price is right you don't care.
