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MECHANISM OF LASER WELDING
Laser welding of metals is performed with beams focused to irradiate levels in the range of 106 to 107 W / cm2. At such power densities, melting occurs in less than a millisecond. First, the radiation pressure becomes appreciable capable of supporting 0.5 mm liquid steel column. Next, the molten liquid has an appreciable vapour pressure. The metal vapour, now interacts with light through the process of inverse population, where electrons in the field of an ion may be accelerated by electromagnetic radiation. This heats the vapour, increasing the number of ions and hence the absorption. Now the plasma, which is a highly ionised gas that absorbs laser light and emits back body radiation. As long as power density is sufficient to sustain it the plasma will act as an efficient absorber.
Relativity of simultaneity Two events occurring at different space co-ordinates x 1 and x 2 in an inertial frame S, are said to be simultaneous, if they occur at the same tim
Draw the Gas welding System and label its parts. Illustrate the several types of flames used in gas welding along with temperature range.
what 80000N to KN
A load of 2MN is applied on a short concrete column 500 mm x 500 mm. The column is reinforced with four steel bars of 10 mm diameter, one in each corner. Evaluate the stresses in t
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