I agree. I e-mailed Lincoln Electric to argue the point. It makes no sense to me. Here are the points I can attest to.
1.) Lincoln Electric told me that the duty cycle was 20% at all settings. I rephrased my question to make sure there wasn't a misunderstanding. They told me the same thing. That isn't to say the person who told me didn't make a mistake; I can only tell you what they said.
2.) It doesn't make sense for Lincoln to make a welder which is less capable than it could be for almost no extra cost, but the conductors from the transformer taps to the amperage selector points are different sizes. That's just a fact. I have the guts of a Lincoln 225 AC sitting on my workbench in the basement and I just went down and looked at it a minute ago. The wires at the lower settings appear to be copper. They get bigger in diameter, and some of them are doubled as the settings go up. Some of the settings have wires from more than one tap on the transformer. The highest 6 settings have flat conductors of what appears to be aluminum. They increase in size, too.
3.) I can't think of a reason Lincoln would deny the existence of higher duty cycles at lower amperage settings if that was the case.
4.) When I've run Lincoln buzzbox welders in the past, I've pretty much ignored the duty cycle, as many people do. I've tripped breakers in the facility circuit breaker box, but I've never had the welder itself shut down on me.
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