Welding Heat Input Calculator
Calculate welding heat input in kJ/in from voltage, amperage, and travel speed. Includes process efficiency factors for SMAW, GMAW, GTAW, FCAW, and SAW.
Each process has a different thermal efficiency — SAW is highest (95%), TIG is lowest (60%).
Read from your machine's display or voltmeter during welding
Welding current — read from your machine or an ammeter clamp
How fast you move the torch/electrode along the joint. Time a 6-inch bead and divide to get your speed.
Related Calculators
Get recommended MIG welder settings — voltage, wire feed speed, and gas flow — for carbon steel, stainless, and aluminum by material thickness.
Calculate recommended TIG welding amperage, tungsten size, filler rod, cup size, and gas flow based on material type and thickness.
Estimate the total cost per weld including labor, filler metal, shielding gas, and electricity for any welding process.
Calculate filler metal weight and quantity needed for butt, fillet, and V-groove weld joints based on dimensions and material.