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Under the arc welding process, heat input and arc energy are the measures of energy that has been supplied to the piece to form a weld. Both are measured in units of energy per unit length.
It refers to a characteristic or dimension such as weld length, a bead, the diameter of a weld spot, or cross-section. The amount of heat input that goes into a weld is determined as a function of time.
Formula for Heat Input
The heat input formula is given by,
\begin{array}{l}Heat\;Input = \frac{60\times Current \times Volts}{1000\times \left ( distance travelled in /min \right )}\end{array}
KJ/in is the unit.
The accurate measurement of arc voltage is the difficulty here, but we mostly measure load voltage at the output terminals of the current source.