List of top Materials, Manufacturing & Industrial Engineering Questions on Principles of welding, brazing, soldering and adhesive bonding

The most suitable electrode material used for joining low alloy steels using Gas Metal Arc Welding (GMAW) process is
In an arc welding process, the voltage and current are 30V and 200A, respectively. The cross-sectional area of the joint is 20 mm2 and the welding speed is 5mm/s. The heat required to melt the material is 20 J/s. The percentage of heat lost to the surrounding during the welding process is ____(rounded off to 2 decimal places).
A flat surface of a C60 steel having dimensions of 100mm (length) x 200mm (width) is produced by a HSS slab mill cutter. The 8-toothed cutter has 100mm diameter and 200mm width. The feed per tooth is 0.1mm, cutting velocity is 20m/min and depth of cut is 2mm. The machining time required to remove the entire stock is _____minutes (rounded off to 2 decimal places).
In a DC arc welding process, open-circuit voltage is 100 V and short-circuit current is 1000 A. Arc voltage varies as $V = 10 + 5l$, where $l$ is arc length in mm. The maximum available arc power during the process is ____________ kVA (in integer).
Which of these processes involve(s) melting in metallic workpieces?
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 \(\underline{\hspace{1cm}}\) kW (round off to two decimal places).