Question

A welding operation is being performed with voltage $=30V$ and current $=100A$. The cross-sectional area of the weld bead is $20m{m}^2$. The work-piece and filler are of titanium for which the specific energy of melting is $14J/m{m}^3$. Assuming a thermal efficiency of the welding process $70$%, the welding speed (in \(mm/s)) is

• A. 7.5

Answer 1

The correct option is A 7.5
$\text{Melting efficiency}={\eta }_{th}=\frac{VI}{AV}$

$0.7=\frac{30\times 100}{20\times V}$

$\Rightarrow V=7.5mm/s$