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I will add that the duty cycle only will affect your work if you are welding near full capacity. Sheet metal needs short bursts or short welds at very low settings.
Welding structure like angle iron, will require longer welds at higher setting, and may get into the duty cycle.
I have a older Lincoln 100 (110v) with gas and have welded up to 3/16 mild steel, with multiple passes and yes, I did find the duty cycle and thermo protection limits..
98% of my weling is outer panels of rusty Mopars or brackets etc..



also

75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU