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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.
Try Square: It has two straight edge arms at the angle of 90 degree and it is used to check the perpendicularity. A try square is shown in Figure. Figure: Try Square
Evaluate Young modulus of elasticity - Ultimate stress: Q: The following observations were made during tensile test on mild steel specimen 40 mm in diameter and 200 mm long
Torsional equation: Derive the Torsional equation T / J = Π /R = Gθ / L Or Derive an expression for the shear stress in shaft subjected to a torque. Sol.
Describe carburetion. What are the basic different air-fuel mixture on which an engine can be operated ? Write a short note on sterling cycle. In an engine working on inlet pres
The Dimension Text Edit command is used to modify the text position of any single dimension. The command can be used to position the tex
can you give me a complete design of hydraulic fixture for turning and facing machine ? with all dimension an graph and analysis after apply the fixture
HOW TO GO ABOUT WRITING A TERM PAPER TITLED: APPLICATION OF TURBULENT FLOW IN MECHANICAL ENGINEERING.
Calculate number of cycles to fracture: If the plastic deformation is taken into consideration calculate number of cycles to fracture in above Example. Solution Δ K I
state six typical application of primary cells
where expendable pattern is used?
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