Welding Heat Input Calculator
Enter voltage, current, travel speed, and welding process to calculate true heat input with the source engine’s efficiency factor.
Formula and worked example
Frequently asked questions
How do I calculate welding heat input?
Multiply voltage by amperage by 60 and the process efficiency, then divide by travel speed and 1,000 when the speed is in inches per minute.
What is the heat input at 24 V, 250 A, and 12 in/min for GMAW?
Gross arc energy is 30 kJ/in. Applying the GMAW efficiency factor of 0.8 gives 24 kJ/in.
Why does welding process efficiency matter?
Not all arc energy reaches the workpiece. The source engine applies 0.8 for GMAW, SMAW, and FCAW; 0.6 for GTAW; and 1.0 for SAW.
How do I convert kJ/in to kJ/mm?
Divide kJ/in by 25.4. Conversely, multiply kJ/mm by 25.4 to get kJ/in.
Related
Welding calculations built for the booth.
Nine welding calculators built for the booth. Electrode picker, SMAW amperage, TIG setup, heat input, gas flow, multi-pass planning, fillet weld strength, filler cost. Free on the App Store and Google Play.
