GATE Mechanical Engineering (ME) 2018 Shift 2 Solved Paper

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