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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.
1) An investment project requires a net investment of $100,000. The project is expected to generate annual net cash flows of $28,000 for the next 5 years. The firm''''''''s cost of
Q. There is no end centered tetragonal lattice in the bravis list, but there is an end centered orthorhombic lattice. Explain why this is so? Ans. A tetragonal system is
Evolutionary Methods Optimization methods based upon natural or biological processes Need to be able to parameterise a solution and determine a cost function (good or bad
Small Business Management Case. Go to the page 215 Kelly Grill. Three questions need to be addressed based on Ch 7. Go to www.coursesmart.com sign in user name: Waleed122@windowsli
Diffuser action: The flare, which increases the area of the duct, is known as a diffuser and its shape determines the rate of compression and the amount by which the air is com
Fire fighting operations - high rise buildings: Inlets that allow the fire service to supplement to water to the sprinklers and to the fire mains are useful additions to the m
what is difference between lagrangian aparoach and eulerian approach?
A body, with a volume of 2m^3, weights 40 kN. Determine its weight when submerged in liquid with S= 1.59.
A 50 cm diameter pipeline in the Arctic Carries hot oil at 30 0 C and exposed to a surrounding temperature of -20 0 C. Special powder insulation 5 cm thick surrounds the pipe an
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