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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.
Electromagnetic Spectrum: Visible light belongs to a family of waves known as the electromagnetic spectrum. Other members of this family include high frequency short wavelength
main difference between warping and without warping
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Passive clearance control system : Compressor discharge air and HP compressor air provide cooling airflow to protect the turbine casing against rapid temperature changes. Th
the percolation should be visualize , and the path of the sphere also. i wanna see the relationship between the number of sphere & the percolation . change the # of sphere and show
What is the deference between enthalpy anne internal energy u
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A 10m diameter circular tunnel is to be excavated in a jointed ground. The joint sets spaced at 6m are dipping towards the West at 50°. A horizontal circular tunnel is to be cons
OUTPUT CHARACTERISTICS: Figure shows a "Common Emitter" amplifier stage. Common Emitter Amplifier Stage With no base/emitter bias applied, there will be no collector
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.
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