M

Mr. Dubey • 52.30K Points
Coach 

Q. Which of the following materials necessitates preheating in welding?

(A) copper
(B) aluminium
(C) cast iron
(D) stainless steel
Correct : Option (C)

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.

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