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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.
Q.27 Explain the desirable characteristics of core sand. What are the normal binders used in core sand ? Types of cores used in foundry. Ans. Core Sand : The core and ma
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With the help of circuit diagram and the waveforms,explain the working of a negative clipper with positive biasing voltage.also explain the Same concept in series clipper circuit
Assignment
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The second order (two degree of freedom) Dutch-Roll approximation is an approximation to the above fourth order system for the Dutch Roll dynamics. A justification for this is to c
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