Question

Blow holes are casting defects caused by

• A. Excessive gaseous substances not able to escape
• B. Discontinuity in metal casting resulting from hindered contraction
• C. Two streams of metals that are too cold to figure properly
• D. Some sand shearing from the cope surface

Hint:

Proper venting of molds and careful control of the molten metal's temperature can help minimize the occurrence of blow holes during casting.

Answer 1

The Correct Option is A

Blow holes in casting are caused by the entrapment of gases, which cannot escape from the molten metal during solidification, leading to defects in the final casting.