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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.
2-17 Given a wind speed of 5.0 m/s at 2 m above the ground and a roughness length of 0.8 cm, compute (a) the friction velocity, in centimeters per second, and (b) the wind speed, i
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the amount of cold working a metal can withstand
PROPELLER TORQUE Propeller torque is produced by the aerodynamic drag on the blades when in motion. Propeller torque acts in the plane of rotation and opposes engine torque.
Fire alarm systems: All buildings require a means by which the warning of fire can be given to all occupants. In the very smallest premises this might be achievable by
the true length of a line is known to be 500m.the line was again measured with a 20m tape and found to be 502m,what is the correct length of the 20m tape.
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
Evacuation of a high rise building - means of escape: Evacuation of a high rise building is likely to be split into two or more phases. Initially, when the alarm activates (f
write drawback of linear array
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