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What is the temperature needed for preheating in cast irons?

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in Casting-Forming-Welding II by (119k points)
What is the temperature needed for preheating in cast irons?

(a) 550°C

(b) 600°C

(c) 650°C

(d) 700°C

This question was posed to me in examination.

The above asked question is from Welding of Various Metals in portion Welding and Related Processes of Casting-Forming-Welding II

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The correct option is (b) 600°C

The best explanation: Cast irons, upon the removal of welding heat, get solidified very quickly. This solidification takes place due to the surrounding cold mass and the air around. Because of such quick cooling, the carbon gets retained and hard metal stays in the weld. To overcome this, cast irons have to be preheated to 600°C.

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