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  1. GATE2019-1-70
  2. GATE2019-1-70
  3. GATE2019-1-70
  4. GATE2019-1-70

Which one of the following welding methods provides the highest heat flux $(W/mm^2)$?

  1. Oxy-acetylene gas welding
  2. Tungsten inert gas welding
  3. Plasma arc welding
  4. Laser beam welding
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