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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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PROPELLER SHAFTS Most modern engines, both reciprocating and turbine, have flanged propeller shafts. Some of these flanges have integral internally threaded bushings that fit
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Fuel system inhibiting. The fuel used in turbine engines usually contains a small quantity of water which, if left in the system, could cause corrosion. All the fuel should th
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Engine indication systems in Aircraft: Engine indications are very important to the crew of a powered aircraft, as they indicate one of the primary parameters needed for flight
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