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Which effect is not seen in alloys on weldability?

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Which effect is not seen in alloys on weldability?

(a) Control of ductile-malleable transformation temperature

(b) Provision for oxidation to molten metal

(c) Reduction in segregation

(d) Grain refinement

The question was posed to me by my school principal while I was bunking the class.

I would like to ask this question from Weldability in division Welding and Related Processes of Casting-Forming-Welding II

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The correct option is (b) Provision for oxidation to molten metal

Easy explanation: On weldability, there are some effects seen in the alloying elements. Some of them are Control of ductile-malleable transformation temperature, Reduction in segregation, Grain refinement and provision for deoxidation to the molten metal.

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