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In spot welding, the parts to be joined are normally over lapped. The work piece are clamped between two water cooled copper electrodes. On the passage of a high transient current, the interface melts over a spot and form the weld. The cooling at the electrode limits the size of the spot. A very high current is needed for a very short duration to complete the welding. The interfaces to be joined are initially cleaned by various methods, including scratch brushing and vapour decreasing. A spot weld normally contains some porosity at the weld centre, which unless excessive is harmless.
The spot welding process is difficult to use for highly conductive materials such as aluminum and magnesium.
Plastic molds are made of plaster of Paris (gypsum) or calcium sulphate, talc and silica flour is added in the plaster of Paris to improve strength and to control the time required
Primed stability derivatives The rolling and yawing motions are coupled through the cross inertia I XZ due to rotation not being about the principal axes. Since in general air
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Riveting is a fixed fastening procedure in which the end of the metal pin is pressed over or spread out by hammering operation. Wrought iron and steel are used for the riveting an
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Question : (a) The Guide project has been developed to provide city visitors with a hand-held context-aware tourist guide. (i) In this case, what is the meaning of context-a
A company issues 15-year, $1,000 par-value bonds, with a coupon rate of 5%. The bonds are sold for $619.70. The tax rate is 30%. Compute the cost of debt before taxes and after tax
An aircraft is flying at a speed of 500 ft/s an altitude of 20,000 ft, where the atmospheric temperature and pressure are 447.3°R and 972.5 lbf/ft2, respectively. If the inlet / di
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