Q. Which gas defect is caused by hydrogen in molten metal?

  • (A) blow holes
  • (B) air inclusions
  • (C) open blows
  • (D) pin hole porosity
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✅ Correct Answer: (D) pin hole porosity
Explanation: as hydrogen is such a small atom, it can diffuse rapidly once it is absorbed, creating pinholes. hydrogen being absorbed by the molten metal inside the furnace and inside the cavity. this is the main reason for the evolution of pinhole porosity.

Published by Mr. Dubey ⭐ 109.87K Points at 20-Sep-2023 12:46 pm in Manufacturing Technology

Explanation by: Mr. Dubey
as hydrogen is such a small atom, it can diffuse rapidly once it is absorbed, creating pinholes. hydrogen being absorbed by the molten metal inside the furnace and inside the cavity. this is the main reason for the evolution of pinhole porosity.

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