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The presence of hydrogen in molten casting strengthens the casting components.

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The presence of hydrogen in molten casting strengthens the casting components.

(a) True

(b) False

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This intriguing question originated from Methods and Materials for Degassing in section Foundry Introduction & Materials of Casting-Forming-Welding II

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Right answer is (b) False

Explanation: Solubility of hydrogen in the melt is generally low at ambient temperature. Hydrogen in molten casting damages or weakens the mechanical properties which also results in occurrence of porosity and losing of tensile ductility in the casting parts. Thus, removal of excess hydrogen is very necessary during solidification of the molten casting.

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