Which one of the following welding methods provides the highest heat flux (W/mm²)?

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

Correct answer: Laser beam welding

Solution

Laser beam welding delivers concentrated energy in the form of a laser beam, resulting in a very high heat flux that allows for deep penetration and fast welding speeds, making it the most efficient method among the options listed.

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