Welding & Fabrication calculator

Shielding Gas Cost Calculator

Find the gas charge for the welding job, including flow around each arc start. You need the flowmeter reading, arc hours, start count, controller timing and delivered gas price.

What this calculator does

  • Estimate shielding gas volume and cost including preflow and postflow at every arc start.

Formula used

  • Extra flow time = arc starts × (preflow + postflow) ÷ 3,600
  • Gas volume = gas flow × (arc time + extra flow time)
  • Gas cost = gas volume × delivered gas price

Inputs explained

  • Shielding Gas Flow: Steady flowmeter reading for the gas blend being used.
  • Arc Time: Arc timer total for this job.
  • Arc Starts: Trigger or robot cycle log count for the job.
  • Preflow Plus Postflow: Sum of controller preflow and postflow settings.
  • Delivered Gas Price: Invoice refill charge divided by delivered gas volume.

How to use the result

  • Best suited to short stitch weld gas allowance, cylinder cost for a robotic batch.
  • Excludes leaks, separate purge cycles and initial hose surge. Does not select a gas blend or establish adequate weld shielding.

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

  • Why does a stitch weld use extra gas? Each start adds preflow and postflow. Hundreds of short welds can therefore consume more gas than one continuous weld with identical total arc time.
  • Can I enter liters per minute? Convert the reading to cubic feet per hour first. Keep gas price on the same volume basis; cylinder pressure alone is not delivered gas volume.
  • Does this count gas leaks? Leaks need a separate measured allowance. A steady flowmeter setting and programmed timing describe commanded use, so compare calculated volume with actual cylinder consumption.
  • Can I reduce postflow to save gas? Set postflow from the qualified procedure and equipment guidance. This calculator prices your settings; it cannot determine the shielding time needed for a sound weld.

Related guides

Last reviewed 2026-10-06.