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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.
Difference between path function and point function
give me an example of law of superposition
Cylinder Bore: The nominal inner diameter of the working cylinder is called the cylinder bore and is designated by the letter D and is usually expressed in millimetre (mm).
Enthalpy defines as heat content of a chemical system.
This type of holon is mainly concerned along with carrying out the work in a fine and correct way at correct time.
Illustrate working of double acting steam engine. What is its diagram factor and thermal efficiency?
The Diameter Dimension Command You can use the Diameter command to annotate a circle or an arc with a diameter dimension. To achieve this simply start the command, pick a point
Application of Hydrostatic sensor paver machine The Hydrostatic sensor paver machine that is used for lying bituminous Mixed material, roll-down or lean-mixed concrete, track-
EINSTEIN''S COEFFICIENTS
advantages and disadvantages of kanban
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