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BASIC PRINCIPLE OF ELECTRON BEAM WELDING(EBW)
Electron beam welding which utilises a heat source of electrons which are accelerated by an electric field to mextremely high speeds and focused to ma sharp beam by electrostatic or electromagnetic fields , which is used for welding a wide range of metals in thickness ranging from foils to extremely thick sections.Electrons are produced at the cathode surface by thermonic emission. The most common emitter material used is tungsten, which contains a small percentage of rhenium. They are being accelerated by high voltage applied between the cathode and the anode. The shape of the bias cup and anode are so designed that the electrons are focused by the electrostatic field and emerge through the anode aperture as a collimated beam. This beam impinges on to the target by the magnetic field of focusing lens, which permits the high concentration of power at the point of impact. The kinetic energy of the electrons is transferred into heat energy which melts / fuses the metal. In general, electron beams in the energy ranges from 100 kV to 10 MV with average powers ranging from 1 kW to 500 kW.
A "perfect" square (shown in dashed lines in the sketch below) with initial dimensions of 0.5 x 0.5 inch is drawn on the surface of a thin aluminum structure (E = 10x10 6 psi, v =
consider the following LPP max z=9x1+8x2+5x3 subject to 2x1+3x2+x3 5x1+4x2+3x3 x1,x2,x3>_0 (a)solve using simlex method (b)hence using the sesitivity analysis,find the new optima
how to draw
Horizontal Curves - Railways In railway engineering, the horizontal curve is defined by its degree as well as by its radius. The degree is the angle subtended at the centre
Explain Gauge Pressure (P gauge ) Gauge Pressure is the pressure of a fluid contained in a closed vessel. It is all time more than atmospheric pressure. It is calculated by an
Write the types and functions of column. a) Explain surveying. Brie?y describe about the chain and accessories
Aspects Of Scheduling The difficulty is a modification of a flexible manufacturing cell at ABB's plant for the manufacturing of turbocharger in Baden, Switzerland. The difficu
A tensile test on a specimen having an initial diameter of 13.11 mm and an initial gauge length of 200.0 mm, gave the following data:
Creating 3-d solid models Two basic approaches to create solid models are : (i) Constructive solid geometry (CSG or c-rep), and (ii) Boundary representation (b-rep).
Spot welding of different metals-Nickel and monel metal While spot welding these materials, the settings are to be properly maintained. Welding time, in this case, is only 50 %
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