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www.zena.net/htdocs/FAQ/dutycycle.shtml

What does the term "duty cycle" mean? Duty cycle is a welding equipment specification which defines the number of minutes, within a 10 minute period, during which a given welder can safely produce a particular welding current.. For example, a 150 amp. welder with a 30% duty cycle must be "rested" for at least 7 minutes after 3 minutes of continuous welding.

en.wikipedia.org/wiki/Duty_cycle

A duty cycle or power cycle is the fraction of one period in which a signal or system is active. Duty cycle is commonly expressed as a percentage or a ratio. A period is the time it takes for a signal to complete an on-and-off cycle. As a formula, a duty cycle (%) may be expressed as: = × %

www.iforgeiron.com/topic/5119-duty-cycle-of-a-welder-the-machine

you left out a critical part of duty cycle Glenn, 20% duty cycle means 2 minutes arc time out of 10 at maximum amp setting. You can usually use the machine at 50% amps or less continuous without damaging the machine.

forum.millerwelds.com/forum/welding-projects/12576-what-is-duty-cycle-of...

For example, if a machine is rated at 300 amps/60% duty cycle, it can weld at 300 amps for six minutes. For the remaining four minutes, the power source needs to idle and cool. The duty cycle for many machines goes up as the amperage goes down. A typical duty cycle for a hobbyist-type TIG welder would be 20%.

For instance, during a 10 minute period, the ProMTS's 30 percent duty cycle means you can weld for 3 to 3-1/2 minutes at 200 amps (its maximum amperage), and then the machine needs to cool down ...

I just crunched the numbers for the duty cycle rating on the faceplate of my welder, and they don't quite add up. My welder is rated at 100% duty cycle up to 80 amps DC, and then 20% duty cycle from 80 to 140 amps. If I put in 140 amps/20% and solve backwards to 80 amps, I get a duty cycle of 60% when it should be 100%.

garage.eastwood.com/tech-articles/mig-welding-duty-cycles

MIG Welding Duty Cycles. When you are using an arc welding machine, you will need to understand what its duty cycle is as it will help you preserve the life and quality of your tool. On this page, you will learn about what a duty cycle is and how it is relevant to MIG welders, specifically. The MIG Welding Duty Cycle

whatis.techtarget.com/definition/duty-cycle

Duty cycle is the proportion of time during which a component, device, or system is operated. The duty cycle can be expressed as a ratio or as a percentage. Suppose a disk drive operates for 1 second, then is shut off for 99 seconds, then is run for 1 second again, and so on.