# Heat Input

Written by Jerry Ratzlaff on . Posted in Welding Engineering

Heat input, abbreviated as $$H_i$$, is the measure of energy that is supplied to the material to form a weld.

## Heat Input Formulas

 $$\large{ H_i = A \; V \; \frac{0.06}{s} \; T }$$ $$\large{ H_i = \frac{ 60 \; A \; V }{ 1000 \; s } }$$

### Where:

$$\large{ H_i }$$ = heat input

$$\large{ A }$$ = welding current

$$\large{ T }$$ = thermal efficiency (depends on the welding process used)

$$\large{ s }$$ = welding speed

$$\large{ V }$$ = arc voltage