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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.
Evaluate the Support required by body on plane: A body having weight 50KN rests in limiting equilibrium on rough plane, whose slope is 30º. The plane is raised to a slope of
(a) Describe the terms "Fluid jet" & "Vane" in Fluid Machine. (b) What is impulse - momentum principal in analysis and design of turbo machines. What are the assumptions made
Q. Determine the size of grains using fineness test of sand? Fineness test : Fineness test of sand specimen determines the size of grains and the distribution of grains of
Q. Basic type of Polymer? Polymer can be divided into three broad divisions: plastics, fibers, and elastomers. Synthetic resins are usually referred to as plastics. Plastic der
(a) What is value of drive chain slackness? (b) Write about cleaning procedure and adjustment of drive chain. (c) What is the wear of drive chain, sprocket and adjustment of
Determine the force to pull box along a level surface: A metal box having weight 10KN is pulled along a level surface at the uniform speed by applying horizontal force of 350
a steel bar is
The following guidelines are intended to assist the HVAC lead, designer or auditor in preparing an assessment of the quality of the HVAC engineering work for a specific project. T
WHY THE WATER INSIDE ANY PLASTIC TUBE GETS EXPAND WHEN THEY FROZEN?
A small producer of specialist vehicles is building a new workshop to meet expected demand for its products over a period of 5 years. The workshop will contain three workcentres,
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