Welding Heat Input Calculator

Inputs

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Measured or procedure arc voltage.

V

Measured or procedure welding current.

A

Torch or electrode travel speed along the weld.

mm/min

Arc efficiency or heat-transfer efficiency used by your procedure basis.

%

Results

Default result
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Heat input(H)
0.6912kJ/mm

H = V * I * 60 * efficiency / (1000 * travel speed).

Also computed

Heat input(H)17.56kJ/in

Energy per length691.2J/mm

Arc power(P)4.32kW

Travel speed used(S)300mm/min

Efficiency used(eta)0.8

Method notes 3 notes
  • Use measured average current, voltage and travel speed when comparing a real weld to a procedure heat-input range.
  • Process efficiency is procedure-dependent. Keep the same efficiency convention when comparing against WPS, code or project limits.
  • This does not evaluate weld size, throat, preheat, interpass temperature, cooling rate, toughness, hydrogen control or metallurgy.

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