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EQUIPMENT USED IN EBW
The electron beam equipment can be broadly divided in to the following sub systems.Electron Gun and Beam Guidance SystemThe heart of the electron beam welding process is the electron beam gun assembly. Electrons are generated by heating a negatively charged emitting material to its thermionnic emission temperature range thus causing electrons can be attracted to the positively charged anode. The grid cup and the anode are shaped and positioned in such a way as to form the emitted electrons into a beam, which passes through the anode aperture.Recent developments in electron beam welding equipment In early days, the guns used were of the directly heated ribbon type, normally these are relatively low power electron beam guns. With the push to higher beam power levels, the difficulties of generating precision beams, control, stabilisation & reproducibility became more exacting. These are suffer from inconsistency and movement within the grid cup, the power density distribution was distorted by the ellipsoidal emission surface. To improve the performance of an electron beam heating, a little change in these conventional type electron beam guns is made by introducing a cathode which is to be heated by bombardment of electrons emitted from the heated filament. This change would make it more reliable at higher power continues operation for longer time. These type of electron beam guns are indirectly heated (bombarded) cathode type electron beam guns.
Using Bode plot calculate (a) Phase margin (b) Gain margin (c) Stability of closed loop system. The open transfer function of the system is
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A hinged object hangs on the outside of a rotating wheel. When the object is in the six o''clock position, it needs to be rotated 180 degrees using only the rotational power of the
Q. What do you know about Direct welds? It is a welding method in which one or more electrodes oppose each other, contacting both sides of the work and with the current passing
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Question: The block diagram of a dc servo motor feed drive is shown Obtain the closed loop transfer function relating the output to the disturbance T L while V
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