are you playin with ampage? to see wot it does?
Clark welders are wot you pay, i have a little 150 amp mig welder to do cars, and does the job well.
but wouldn't rate it to a proper 3 phase mig welder. single phase will never be as good as 3 phase, due to the arc stableness.
but on stick welders i've used cheapo ones, and they do the job, but again there's nothin better than a 3 phase plant or a good genny welder.