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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.
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compare conventional lagoon,aerated lagoon and activated sludge process,including process flow diagrams and hydraulic retention timesquestion #Minimum 100 words accepted#
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Actuators The actuator consists of the control surfaces and associated servomechanisms, and is used to change the missile attitude and trajectory or flight path.
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We now have some idea about what models are available to simulate the flow over an aerofoil, and also how to use the Hanley package to apply these methods. Keep referring to you
Inhibit Gate Occasionally it is required to 'hold' one input to an AND gate at a particular logic level in order to disable the entire gate. One method of representing this sy
Reduction Gearing : Compound epicyclic reduction gears enable a greater reduction in speed to be obtained without resorting to larger components. They may be of either the fix
2. A contractor has both a 3-cy and a 5-cy shovel in the equipment fleet. Select the minimum size shovel that will excavate 400,000bcy of common earth in a minimum of 130 working d
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