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Questions and Answers
Which type of defect in casting is caused by the trapping of gas in the molten metal or by mold gases evolved during the pouring of the casting?
What is the major defect likely to occur in sand castings due to the presence of cut and washes, and fusion?
Which defect is characterized by the presence of blow holes, open holes, and pinholes in a casting?
What type of defect in casting is caused by the presence of cold shut, mis-run, and slag inclusion?
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Which defect in casting is characterized by the presence of hot tears and hot spots?
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Study Notes
Gas-Related Defects
- Gas defects occur when gas is trapped within molten metal or due to mold gases during casting.
- Common examples include blow holes, pinholes, and open holes.
Defects in Sand Castings
- Major defects linked to sand castings include cut and washes, and fusion.
- These issues can lead to a decrease in the overall integrity and quality of the casting.
Blow Holes and Surface Defects
- Characterized by blow holes, open holes, and pinholes, indicating gas entrapment.
- Surface imperfections can affect the aesthetics and functionality of the casting.
Inclusions and Mis-Runs
- Defects caused by mis-runs, cold shuts, and slag inclusion can lead to severe structural weaknesses.
- Inclusion of materials can affect the flow of molten metal, leading to incomplete fills.
Hot Tear and Hot Spot Defects
- Hot tears and hot spots are indicative of thermal stresses during cooling.
- Such defects can cause cracks in the metal, compromising the casting's structural integrity.
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Description
Test your knowledge of casting defects in the manufacturing process with this quiz. Identify and understand the unwanted irregularities that can occur in castings and learn about methods for prevention and repair.
