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The gases used in different types of welding would include

  • A.Oxygen and hydrogen
  • B.Oxygen, hydrogen, acetylene and nitrogen
  • C.Oxygen, acetylene and argon
  • D.Oxygen and acetylene

Answer: D

Welding uses oxygen and acetylene. Burning acetylene in pure oxygen gives the hottest common flame, about 3,300°C, which is above the melting point of steel.

Other processes use argon or carbon dioxide, but only as a shielding gas to keep air away from the weld, not as fuel.

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