Question

13. Which cast iron cannot be
welded? *
A: Grey cast iron
B: White cast iron
C: Nodular cast iron
D: Malleable cast iron​

Answer 1

Answer:

1

Explanation:

Answer 2

Option B is the correct answer i.e., White cast iron.

• As a result, cast irons that are entirely composed of cementite, which is carbon, are referred to as white cast iron.
• It is made by rapidly cooling molten alloy, also referred to as chilled cast iron.
• It is exceedingly brittle and hard, making welding challenging. It is between 400 and 500 BHN in hardness.
• Much of the carbon is preserved in the form of iron carbide without graphite flakes by lowering the carbon and silicon content and cooling quickly.
• However, iron carbide, or cementite, is very brittle and hard, thus these castings are employed in applications that demand exceptional hardness and wear resistance.

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