Of course duty cycle is continous. It's expressed as a percentage of time the machine can operate; this being 20% at maximum amperage. So for any 10 minute period it can weld at full power for 2 minutes. I'm not sure if Linc recomends an increasing duty cycle to 100% at 75 amps or not... but that IS how Miller rates their welders. What is 20% at 225 amps gradually increases to 100% somewhere around 75 amps. I've always understood the linc to be 100% duty at 75 amps or below. In practice there were a lot of them that burned 7018 AC 1/8" steady for hours on end with the only rest being the time it took to change rods and chip welds... I know that's how mine got treated and it never bothered it on bit.
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