Question

A gas tungsten arc welding operation is performed using current of $250A$ and an arc voltage of $20V$ at a welding speed of $5mm/s$. Assuming that the arc efficiency is $70$%, the net heat input per unit length of the weld will be
(round off to one place).

• A. 0.7

Answer 1

The correct option is A 0.7
$\text{Given data :}$

$\text{Welding current,}I=250A$

$\text{Voltage,}V=20V$

$\text{Welding speed,}=v=5mm\text{per second}$

$\text{Arc heat transfer efficiency,}\eta =70\text{\%}$

$\text{Heat required per unit length,}$

$H_s=\frac{VI}{v}\times \eta =\frac{250\times 20}{5\times 1000}\times 0.7$

$=\frac{700}{1000}=0.7kJ/mm$