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EFFECT OF PROCESS PARAMETERS
High voltage gives high velocities in the electron beams. The mutual repulsion effects in the constituent electrons will be less marked at high velocities than at low velocities. Therefore, the higher the voltage, the sharper the possible focus. The sharper the possible focus, the deeper the penetration for a given power. The longer the working distance, the greater the depth of field, and greater the focus tolerance. This of course is related to convergence of the beam in respect to the work piece. High voltage beams have a narrower angle of convergence than low voltage beams. As penetration in a material is proportional to the energy density during welding, surface speed will also affect penetration. The slower the speed, the greater the penetration, however, if the speed is too slow the entire work piece will heat up and a massive heat affected zone will result. Therefore the lowest practical speed is limited to around 250 mm per minute. The factors, which influence weld depth, are as follows:
In a steam jet refrigeration system, the ejector extracts 3.3 m3/s of saturated water vapor at a temperature of 7.2 °C from the flash chamber. The return water from the cooling coi
Q. Explain working of Steam Sampling? Sample coolers shall be supplied by the Vendor. A common sample spillage trough shall also be provided by the Vendor, with a cover screen
Illustrated about the term bending moment? Bending Moment The critical section for bending moment for masonry or concrete block walls is half-way between the centre line and
Determine the reaction at specific points: A light rod AD can be supported by frictionless pegs at B and C and rests against frictionless wall at A as shown in th
Express the force in vector form: A force of 400 N forms angles of 45 o , 65 o and 120 o , respectively, along with the x, y and z axes. Express the force in vector form.
GMAW POWER SOURCE A power source wit h a flat characteristics is almost universally used for GMAW process as it provides self adjustment and stabilisation of the arc. Also it m
A Small connecting rod 220mm long between the centres has a mass of 2kg and mass moment of inertia of 0.02 kg- m² about its centre of gravity. The centre of gravity is located at a
Derive and expression for force exerted by a jet of water on fixed vertical plate in direction of
a) Determine a real root of the equation cosx = 3x-1 correct to three decimal places using Iteration method. b) Detremine the real root of the equation logx - cosx =0 by Newton
Define Advantage and Disadvantage of Electron Beam Machining Advantage 1. Suitable for automatic machining. 2. Absence of mechanical contact between work piece and too
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