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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.
Replacement Analysis In the previous chapter we have compared various investment alternatives. Two scenarios were considered: single alternative and a set of mutually exclusive
What makes buildings earthquaqe resistant?
Actuators The actuator consists of the control surfaces and associated servomechanisms, and is used to change the missile attitude and trajectory or flight path.
Specific Air Range & Specific Endurance Key cruise parameters are Range (distance flown) and Endurance (time of flight). It is important to be able to relate these to the amou
A continuous fractionating column separates benzene and toluene into two product streams. We were given all the mass fractions which makes this question easy because all we must ca
Allowances for pattern : A pattern is always made larger than the required size of the casting in order to allow for various factor, such as shrinkage, machining, distortion and r
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you are a young entrepreneur & you have to compete with already established firms in the industry by taking help from marginal costing tools with adequate examples. you have to giv
draw diagonal scale of rf 1/500 and show 57.5m on it
Q. Describe two major product applications of powder metallurgy. Ans. Following are some typical applications of powder metallurgy. (i) Refractory metal : P
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