Welding & Fabrication worked example

Welder Duty Cycle at 43% rated power source duty cycle at welding amps: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop rated power source duty cycle at welding amps to 43%, then walk the calculation through step by step. Calculate welding power source duty cycle from arc-on time at amperage and total cycle period, with gap to the rated duty cycle.

The inputs for this scenario

  • Arc-on minutes in the cycle: 6 min (held at the documented default)
  • Total cycle period: 10 min (held at the documented default)
  • Rated power source duty cycle at welding amps: 43 % (the input this scenario stresses; the baseline uses 60)

Working through the calculation

  • The calculation starts from the formula this tool documents: Actual welder duty cycle = arc-on minutes in the cycle ÷ total cycle period × 100.
  • Actual welder duty cycle works out to 60 % duty at these inputs, and this is the headline figure for the scenario.
  • Duty cycle margin to nameplate works out to -17 points at these inputs.
  • Arc-on minutes in the cycle works out to 6 count at these inputs.
  • Total cycle period works out to 10 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where rated power source duty cycle at welding amps sits at 60% and the headline result is 60 % duty, this scenario lands almost exactly on the baseline at 60 % duty.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to rated power source duty cycle at welding amps, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. Nameplate duty cycle ratings are tied to a specific amperage and ambient temperature; weld hotter or in a hot shop and the real margin shrinks below what this comparison shows.

Results at a glance

  • Actual welder duty cycle: 60 % duty (headline result)
  • Duty cycle margin to nameplate: -17 points
  • Arc-on minutes in the cycle: 6 count
  • Total cycle period: 10 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Welder Duty Cycle calculator, set rated power source duty cycle at welding amps to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.