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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.
Value engineering & Value analysis VA may be defined as looking at an existing product or a product already in production to see if changes in design or process can reduce prod
First Gear Position : When gear M1 is in mesh with gear C1 then this is first gear drive position. The gear C1 is freely attached to counter shaft, so gear C1 itself cannot rotate
Grinding Wheels Implicated to be rotated at relatively high rotational velocities within grinding machines, grinding wheels contain a surface of rotation about a central axis.
Explain Thermodynamics System In thermodynamics the system is illustrated as the quantity of matter or region in space upon which the concentration is concentrated for the sake
A sign of uniform density weighs 270 lb and is supported by a ball-andsocket joint at A and by two cables. Determine the tension in each cable and the reaction at A.
Q. Explain Sulphidation process? The presence of sulphur converts the surface of the metal to a sulphide scale which is generally more destructive than an oxide scale. Sulphid
how to work proell govwrnor?
Particle in a Box 1 (from Dr. Liebman): You will remember that the energy of a particle in a 3 (and 2) dimensional box is defined by 3 (or 2) quantum numbers. This brings up the co
Face plate turning fixtures
how is varignons theorem useful in engineering mechanics
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