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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.
Static stability derivatives Static stability requires that a restoring action to any motions caused by forces and moments is auto-matically produced along and about the same a
Pitot intakes: This intake is suitable for subsonic or low supersonic speeds. Examples, 707, 747, A300B, Tristar, etc. The intake is usually short and is very efficient becau
Identify people at risk: It is often easy to forget that there may be people in a building who cannot move as quickly as the rest of us. They may be in a wheel chair, they ma
Casting means the pouring of molten metal into a mould, where solidification occurs. Advantages of Casting Process (i) It is the cheapest method of fabrication.
Representing vectors in different axes All positions, velocities, momentums and accelerations are really relative positions, relative velocities, relative momentums and relativ
on metlab
Fuel control in Aircraft Engine: The basic fuel system is comprised of a fuel pump that receives low-pressure fuel from the aircraft fuel tank via a low pressure fuel valv
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EL DESPLAZAMEINTO DE UNA PARTICULA ESTA DADO POR S=(-2+3T)e¨-0.5t
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