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The correct answer is (d.) welding. Welding is a fabrication method that joins together materials, usually metal. by causing fusion. This method melts the materials upon joining it together  for a specific temperature without melting the base metal.
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Answer:

d. welding is the correct answer.

Explanation:

  • The fabrication method that joins together materials, usually metal, is known as welding.
  • Welding is a process by which materials are joined by melting their parts.
  • In the welding process metals parts are joined by using heat.
  • The heat is supplied with the help of a gas flame or by an arc that melts the metal parts and enabling them to cool producing fusion.
  • Welding is used joints the dissimilar metals and thin metals, sheets.