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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.
(a) Explain briefly any five roadway elements. Include function and current practices used in the design of these elements. (b) Discuss any three emerging (i.e. 'Intelligent T
Re-heat Ignition The atomised fuel spray is fed into the re-heat jet pipe and ignited by one of three methods:- • Spark Ignition • Hot Streak Ignition • Catalytic Ignition a
The following is the capital structure of X Ltd. as on 31st Dec 2003 Rs in m
Define the aircraft axes & degrees of freedom. Analyse the different maneuvers that can be done by an aircraft.
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Transistors: The transistor can be a high or low resistance device, hence the name, which is derived from TRANSfer resISTOR. It is used in many switching and amplifier circ
Phase detector Phase detector (PD) consists of a multiplier and a low pass filter. The output of the PD has a magnitude proportional to V s cos 2 φ where φ is the phase shif
50 Design specification for an angle grinder
Thermoelectric effect The measurement of temperature using a thermocouple relies on Seebeck effect. The electrons occupy different energy levels in different materials
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