Does 60% duty allow six minutes of cooling?

No. A 60% rating allows six minutes of welding in ten minutes at the stated conditions. The remaining four minutes provide the rated cooling interval.

Can I use a rating at another amperage?

Use the manufacturer’s rating or chart at your actual welding output. This calculator does not interpolate a thermal capability from amperage alone.

Is this the same as operator productivity?

No. Equipment duty checks a thermal operating limit. Operator productivity measures arc-on time within a working shift, including preparation, movement and other activity.

What if the machine overheats within the rating?

Follow its overheating and cooling instructions. Check ambient temperature, airflow, input supply and the output conditions associated with the rating before continuing.

Welding & Fabrication calculator

Welder Duty Cycle Calculator

Check whether arc-on time fits the equipment duty rating over ten minutes. Enter welding minutes and the rating at your actual output.

What this calculator does

Check arc-on time against the power source duty rating in a ten-minute interval.

Formula used

Actual duty (%) = arc-on minutes ÷ 10 × 100
Allowed arc minutes = rated duty ÷ 100 × 10
Rated cooling remainder = 10 − allowed arc minutes
Rating headroom = rated duty − actual duty

Inputs explained

Arc-On Time in Ten Minutes: Planned or logged welding time in one ten-minute interval.
Rated Equipment Duty Cycle: Nameplate duty rating at the actual welding output and conditions.

How to use the result

Best suited to power source capacity Check, long pass scheduling.
This does not extrapolate ratings between welding currents. Manufacturer overheating instructions override this scheduling arithmetic.

Current U.S. benchmarks

The producer price index for steel mill products stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
U.S. iron and steel import customs value ran $2.2B in Aug 2026 (Census International Trade). The U.S. ran a trade deficit of $0.6B in the category that month. This dollar total mixes price, quantity, product mix, origin, and timing; it does not measure physical import volume or prove a tariff or reshoring effect.
The U.S. has 53,790 fabricated metal products establishments employing about 1,441,471 workers (Census County Business Patterns, 2023).

Common questions

Does 60% duty allow six minutes of cooling? No. A 60% rating allows six minutes of welding in ten minutes at the stated conditions. The remaining four minutes provide the rated cooling interval.
Can I use a rating at another amperage? Use the manufacturer’s rating or chart at your actual welding output. This calculator does not interpolate a thermal capability from amperage alone.
Is this the same as operator productivity? No. Equipment duty checks a thermal operating limit. Operator productivity measures arc-on time within a working shift, including preparation, movement and other activity.
What if the machine overheats within the rating? Follow its overheating and cooling instructions. Check ambient temperature, airflow, input supply and the output conditions associated with the rating before continuing.

Last reviewed 2026-10-06.