Types of electron beam welding gun, Mechanical Engineering

TYPES OF ELECTRON BEAM WELDING GUN

 

Diode (Cathode - anode) Gun: In this gun, the beam shaping electrode and the emitter are both at the same electrical potentials. These are, of simple construction but the only way to control beam current is by varying either the high voltage or filament temperature.

Triode (Cathode - grid - anode) Gun: The most widely used gun is the thermionic triode gun. The beam shaping grid can be biased to a slightly more negative value than the emitter in order to control beam current flow. In this case, the emitter alone is called cathode, focused with a spot diameter of less than 0.005 inches. Both of the gun types discussed above have directly heated filaments or cathodes, that is heated by passing an alternating or direct current (AC or DC) through it. Another method of cathode heating is indirect heating of these filaments by bombardment from another cathode known as the primary cathode.

Posted Date: 9/17/2012 6:57:16 AM | Location : United States







Related Discussions:- Types of electron beam welding gun, Assignment Help, Ask Question on Types of electron beam welding gun, Get Answer, Expert's Help, Types of electron beam welding gun Discussions

Write discussion on Types of electron beam welding gun
Your posts are moderated
Related Questions
calculation of stage wise specific steam consumption and power output

Find out load lifted by the machine: An effort of 400 N is applied in a lifting machine. The distance moved through effort is 4 m and that by load is 40 cm. If the efficiency

W rite down the different assumptions in simple theory of bending.                               The assumptions which are made in theory of simple bending are stated below:

difference between blow hole and porosity


degrees of freedom of a planar mechanism

The Contractor is responsible for obtaining all drawings, standards and specifications referred to in the bid documents and to request as needed additional or missing reference dat


comparing the different coding systems ?

what are the different method for worm gear optimization