Specific calculators, planners, and explainers for jobs that usually get buried in forums.
HTML-first, no account wall
Shareable URLs and direct outputs
Welding heat input calculator
Turn volts, amps, travel speed, efficiency, and weld length into net heat input, pass time, total delivered energy, and a simple check against an optional WPS-style target window. Results update instantly in the browser for both metric and imperial shop workflows.
What this answers
Heat input matters because the same volts and amps can produce very different weld behaviour once travel speed changes. Too little can leave you cold and underfused; too much can widen the HAZ, soften material, or push you outside a procedure window.
This page is built for practical pass planning. It gives the heat number in both unit systems, estimates arc time over a seam length, totals the delivered energy for the pass, and shows whether you are under, over, or inside an optional target range.
Good uses
- Checking whether a revised travel speed will push a pass outside a WPS heat-input band
- Comparing TIG, MIG, stick, and submerged-arc assumptions without recalculating by hand
- Explaining why a slower weave or hotter setting changes seam time and delivered energy so quickly
Assumptions
The efficiency presets are planning defaults, not code rules. Actual net energy transfer varies with process, setup, arc length, and measurement method, so critical procedure qualification still needs your governing standard and recorded shop data.