GATE Mechanical Engineering (ME) 2021 Shift 2 Solved Paper

A spot welding operation performed on two pieces of steel yielded a nugget with a diameter of 5 mm and a thickness of 1 mm. The welding time was 0.1 s. The melting energy for the steel is 20 J/mm3. Assuming the heat conversion efficiency as 10% the power required for performing the spot welding operation is _____ kW (round off to two decimal places).