📊 Manufacturing Technology
Q. Which of the following materials necessitates preheating in welding?
  • (A) copper
  • (B) aluminium
  • (C) cast iron
  • (D) stainless steel
💬 Discuss
✅ Correct Answer: (C) cast iron

Explanation: as the weldability of cast iron usually decreases as the amount of free carbon in cast iron increases, so it is preheated to a dull red and then welded.

Explanation by: Mr. Dubey
as the weldability of cast iron usually decreases as the amount of free carbon in cast iron increases, so it is preheated to a dull red and then welded.

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