GATE Mechanical Engineering (ME) 2019 Shift 1 Solved Paper

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Question : 29 of 65

Marks: +1, -0

Which one of the following welding methods provides the highest heat flux

( {W} {/} {mm}^{2}) ?

Laser beam welding
Oxy-acetylene gas welding
Plasma arc welding
Tungsten inert gas welding

Solution:

Laser Beam welding provides the highest heat flux

Welding	Heat density $W{/}cm^2$	Temperature (℃)
Gas welding	$10^2 - 10^3$	$2500 – 3500$
Shielded metalarc welding	$10^4$	$> 6000$
Gas metal arc welding	$10^5$	$8000 – 10000$
Plasma arc welding	$10^6$	$15000 – 30000$
Electron beamwelding	$10^7 – 10^8$	$20000 –30000$
Laser beam welding	$> 10^8$	$> 30000$

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