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Skeleton pattern
A skeleton of the pattern made of strips of wood is used for building the final pattern by packing sand around the skeleton. After packing the sand, the desired form is obtained with the help of a stickle as shown in Figure.8. The type of skeleton to be made is dependent upon the geometry of the work piece. This type of pattern is useful generally for very large castings, required in small quantities where large expense on complete wooden pattern is not justified. It is shown in figure.
Figure- Skeleton Pattern
Larson-Miller parameter: For material of example of calculate life in hours at temperature of 900oC, and at σ = 20 MPa. Solution Larson-Miller parameter is given by
(a) Show energy method and Rayleigh's method for single degree of freedom system. Also discuss its application. (b) A sphere of diameter D floats half submerged in water. If the
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what is cross head velocity
Explain Newton's Law of cooling. What do you mean by convective Heat Transfer coefficient ? What are the factors on which co-efficient of convective heat transfer (h) depends upon
Pulsed DC Welding Pulsed DC involves the repetitive variation in arc current from a background (low) value to a peak value. Adjustments of the pulse current time, background cu
Q. External Pressure Design of unfired pressure vessels? Determine requirements for external pressure based on the expected operation of the vessel, and add a suitable operatin
PRINCIPLE OF SUBMERGED ARC WELDING In submerged arc welding, the arc zone is submerged beneath the molten flux and hence there is no visible signature of the arc. Welding current
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Q. What is Warm extrusion? • Warm extrusion is done above room temperature, but below the recrystallization temperature of the material the temperatures ranges from 424 to 975
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