Mechanical Engineering Exam > Mechanical Engineering Questions > Hot tears are casting defectsa)Which occur du...
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Hot tears are casting defects
- a)Which occur due to some sand shearing from the cope surface
- b)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escape
- c)Which occur due to discontinuity in metal casting resulting from hindered contraction
- d)caused by two streams of metals that are too cold to fuse properly
Correct answer is option 'C'. Can you explain this answer?
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Hot tears are casting defectsa)Which occur due to some sand shearing f...
Explanation:
Hot tears are casting defects that occur due to discontinuity in metal casting resulting from hindered contraction.
Discontinuity in metal casting arises due to the inability of the metal to contract freely during solidification. The reason for hindered contraction could be due to various factors like inadequate feeding, insufficient risering, and improper gating system design.
Hot tears generally occur in the last stages of solidification, where the metal is still in a semi-solid state. During this stage, the metal is still undergoing shrinkage due to solidification. If there is no compensation made for this shrinkage, then the metal will crack, resulting in hot tears.
The hot tears usually occur in the areas where the metal experiences the maximum amount of stress. These areas are usually the thick sections of the casting, where the metal has a greater tendency to shrink.
Hot tears can be prevented by using proper risering techniques, gating system design, and proper cooling rates. By doing so, the metal can contract freely, and the chances of hot tears are reduced.
In conclusion, hot tears are casting defects that occur due to hindered contraction in metal casting. Proper gating system design and risering techniques can help prevent the occurrence of hot tears.
Hot tears are casting defects that occur due to discontinuity in metal casting resulting from hindered contraction.
Discontinuity in metal casting arises due to the inability of the metal to contract freely during solidification. The reason for hindered contraction could be due to various factors like inadequate feeding, insufficient risering, and improper gating system design.
Hot tears generally occur in the last stages of solidification, where the metal is still in a semi-solid state. During this stage, the metal is still undergoing shrinkage due to solidification. If there is no compensation made for this shrinkage, then the metal will crack, resulting in hot tears.
The hot tears usually occur in the areas where the metal experiences the maximum amount of stress. These areas are usually the thick sections of the casting, where the metal has a greater tendency to shrink.
Hot tears can be prevented by using proper risering techniques, gating system design, and proper cooling rates. By doing so, the metal can contract freely, and the chances of hot tears are reduced.
In conclusion, hot tears are casting defects that occur due to hindered contraction in metal casting. Proper gating system design and risering techniques can help prevent the occurrence of hot tears.
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Hot tears are casting defectsa)Which occur due to some sand shearing f...
Due to rapidly moving solidification fronts towards centre, there will be some contraction stress associated with it during cooling. Especially in case of chills these stresses will be multiply at the centre and as a result of that cracking appears during the last stage of solidification at the centre, known as HOT TEAR.
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Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer?
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Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer?.
Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer?.
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Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Hot tears are casting defectsa)Which occur due to some sand shearing from the cope surfaceb)Which take the form of internal voids or surface depression due to excessive gaseous material not able to escapec)Which occur due to discontinuity in metal casting resulting from hindered contractiond)caused by two streams of metals that are too cold to fuse properlyCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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