Electron beam welding(ebw)-basic principle, Mechanical Engineering

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.

Posted Date: 9/17/2012 6:45:05 AM | Location : United States







Related Discussions:- Electron beam welding(ebw)-basic principle, Assignment Help, Ask Question on Electron beam welding(ebw)-basic principle, Get Answer, Expert's Help, Electron beam welding(ebw)-basic principle Discussions

Write discussion on Electron beam welding(ebw)-basic principle
Your posts are moderated
Related Questions
list 5 important factors in the design of a workshops layout

Q.   Describe the principle of energy conversion. Show that the reaction of coupling magnetic field on the electrical or mechanical system is essential for the electro - mechanical

Derive the shape functions N1...N10 for a 10 node triangular element in terms of area coordinates L 1 , L 2 , L 3 .  Nodes are equally spaced on the edges and node 10 is at the cen

What are the objectives of the earth pressure and retaining structures? After knowing all concepts about the same you should be able to learn: a. Know the field situations w

Find out the number of revolution: A flywheel of mass 20 kg and radius 100 mm is made to rotate at 600 RPM. Determine the KE of the flywheel. If the frictional couple at its b

For a transfer function graph with h(t) on the y-axis and time in seconds on the x-axis, the h(t)=1 from 0 to 2 seconds, while h(t)=0 everywhere else. How do I graph the unit step

for an otto cycle, compression ratio=8.5:1,air inlet=15degree celsius and pressure=101.3kpa, maximum cycle temperature= 1800degree celsius, what is temperature after compression,te

Find out stress - strain and elongation of bar: A circular rod having diameter 20 m and 500 m long is subjected to the tensile force of 45kN. The modulus of elasticity for st

how to e solve motion of followers in simple harmonic motion. what is the angle thita?

Evaluate the deflection at the free end of the cantilever: Discover the slope and deflection at the free end of the cantilever illustrated in Figure . Take EI = 200 × 10 6 N-