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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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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