ONE FORMULA, ONE ANSWER
Welding heat input per length calculator
Calculate the thermal energy delivered to the workpiece per weld length for constant voltage, current and travel speed. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Heat input per weld length H
Enter values and select Calculate.
H = ηUI/v; 1 kJ/mm = 10⁶ J/m
Assumptions
Required: constant voltage, current and travel speed, with a process-appropriate thermal efficiency. At η=1 the result is arc energy per length before efficiency correction. For pulsed or alternating waveforms, mean voltage times mean current can differ from mean instantaneous power; this constant-parameter model is then unsuitable. Excluded: heat-affected-zone temperature, cooling rate and weld qualification.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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