In tools/equipment such as welders, the maximum duty cycle is defined as the percentage of time in a
10 minute period that it can be operated continuously before overheating.
20% duty cycle means that 2 min welding, 8 min cooling. do not turn the welder off, the fan is doing the cooling.
your 110v unit is 20% duty cycle. the 220v unit is duty cycle rated at 30%, 3 min welding, 7 min cooling.
keep what you have. not worth the $$$ to get 1 min more of welding in 10 min.
seriously, i have welder 20 min with my 20% welder @ heat 3 of 4
your welder welds 5/16" steel in a single pass
your welder will weld thicker material in multiple passes.
you could theoretically weld 2" material with your welder. it would take for ever but you could do it...