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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.
f(x)=x^2 - 1 , g(x)=2x + 1
Gated pattern is used to produce good casting. It is essential to make sure that full supply of molten metal flow into every part of the mould. Provision for easy passage of the
Suppose an investor acquired 1 Round lot of Walden stock at $30/share last year. If the investor received a $1.00 per share dividend during the year and sells the shares at year-en
Rotational stability equations The torque T applied to any rigid vehicle with moving c.g. is in general determined by T = ∂HVE/∂t|E + uvE ×MugE where E is the inertial a
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draw and explain the working of a positive clamping circuit?
Sand castings are porous enough and, therefore, cannot be used for pressure sight vessels. Structure obtained by sand casting is loose and hence not stranger than wrought products.
show the practical use of it also descibe it elaborately why it is useful which way we can use it where we use it
Q. 1 A 50 cm diameter pipeline in the Arctic Carries hot oil at 30 0C and exposed to a coefficient surrounding temperature of -20 0C. Special powder insulation 5 cm thick surround
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