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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.
Determine the enhance in volume of the vessel: A thin spherical vessel of diameter 800 mm and thickness 6 mm is filled through a liquid at an internal pressure of 1.5 N/mm 2 .
Mash stitch welding An overlap of about 1.15 mm is kept and then the plates are squeezed flash by application of pressure at hot condition. Mash stitch welding is used in the
Use roller support - steel trusses of bridges: Explain, why do we use roller support in case of steel trusses of bridges? Sol. : In the bridges most of time external f
Alloys For Cutting Tools Apart from tool steels illustrated in further unit, alloys that comprise wholly non-ferrous elements have been enhanced. Such alloys behave superior
Calculate the maximum allowable internal pressure to which a cylinder with an internal diameter of 200 mm and external diameter of 300 mm may be subjected if the cylinder is to hav
Explain following a) Type of beam b) What is column and strut with example. c) Type of load d) Define S.F. and B.M diagram. e) Write crippling load formula for a
a) Round off the numbers 865250 amd 37.46235 to four significant figures and compute Ea, Er, Ep in each case. b) IF u= 4 x 2 y 3 /z 4 and errors in x, y, z be 0.001, determine
Q. Module Assembly Site Preparation? To set a module on the piles installed on project site, the following preparations shall be made: The Designer shall provide design elev
used of Wilson ha rtnell governor
Does this college offer courses in the field of mechanicalthermodynamics?
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