Welding Heat Input Calculator
SI
Imp
Imperial
Inputs
View results
Arc voltage
(V)
Measured or procedure arc voltage.
V
Welding current
(I)
Measured or procedure welding current.
A
Travel speed
(S)
Torch or electrode travel speed along the weld.
mm/min
Process efficiency
(eta)
Arc efficiency or heat-transfer efficiency used by your procedure basis.
%
Results
Default result
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Heat input
(H)
0.6912
kJ/mm
H = V * I * 60 * efficiency / (1000 * travel speed).
Also computed
Heat input
(H)
17.56
kJ/in
Energy per length
691.2
J/mm
Arc power
(P)
4.32
kW
Travel speed used
(S)
300
mm/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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