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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.
#draw a net sketch of the geometry of a single point tool.
Define Cases in which Automation is Done Automation is done in following cases:- a) Loading and unloading of parts. b) Automatic production lines. c) Automatic tool ch
Compressive Stress: The stress induced in a body, when subjected to two equal and opposite pushes as shown in figure (a) as a result of which there is an decrease in length
example with its properties
Q. Piping Inspection and Test Plan? Piping Inspection and Test Plan review and Piping Materials Test Results review shall be by the Piping Materials group, or by / with assista
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Draw the P-h and T-S diagram for the vapour compression cycle when the vapour after compression is : (i) wet region (ii) dry saturated
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Shear Force and Bending Moment: Shea r Force (S.F.) Algebraic sum of all vertical forces at any section of beam to the right or left of the section is known as shear for
b) Differentiate between Hot and Cold working process. What are their advantages and disadvantages? Illustrate with examples.
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