GATE Mechanical Engineering (ME) 2019 Shift 2 Solved Paper

Question : 41 of 65

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A gas tungsten arc welding operation is performed using a current of 250 A and an arc voltage of20 V at a welding speed of 5 mm/s. Assuming that the arc efficiency is 70%, the net heat inputper unit length of the weld will be ________kJ/mm (round off to one decimal place).

Your Answer:

Validate

Solution:

\text " Heat input "\;=η ×\text " Power "_{\;\text "elec "\;}

\text " Heat input "=0.7 × 250 × 20=3500 \;\text " Watt "\;

Heat input per unit length

=\;{3500}/{5}=700 \;{J}/{ {mm}}

=0.7 {KJ} {/} {mm}

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