AFAIK, not really. Your best bet if you want a better duty cycle is to buy a welder that you won't be running at max output. If the thickness of steel you will be working with the most requires around 110 amps, then a welder with 120 amp max output will get frustrating to use as you are constantly letting it "rest". If you have a welder who's max output is 175 amps, when used at the 110 amps the duty cycle will be much better (probably greater than 35%). Plus the extra power is there for the times you are working with material thicker than normal for you.