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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:
At a fixed point in a strained material the intensities of normal stress on the planes at right angles to each other are 20 N/mm 2 and 10 N/mm 2 . Evaluate the principal stresses
Refractoriness The capability of a material to withstand the action of heat devoid of appreciable deformation of softening is submitted to as refractoriness. Such property is m
Find out diameter of steel wire: Q: A load of 5 KN is to be raised with help of steel wire. Find out diameter of steel wire, if maximum stress does not to exceed 100 MNm 2
NUCLEAR APPLICATIONS OF ELECTRON BEAM WELDING Electron beam has been applied to the fabrication of fuel elements for pressurised water reactors and the distinct advantages
Q. What is Tantalum? Tantalum is one of the most corrosion-resistant metals known. However, the high cost of tantalum has limited its commercial use as an all-purpose corrosio
Just-In-Time: This unit begin with the discussion of Just-In-Time strategy. Several terms used in the process are also explained. JIT is an encompassing philosophy considering
I have literature review and the title is "the effect of fluid cooling on the performance of building integrated photovoltaic thermal systems. Using some BIPVT prototypes measure
Formula for maximum power transmitted by belt: Derive formula for maximum power transmitted by belt when centrifugal tension is considered. Sol: Let T 1 = Tension on
Q: The12m boom AB weight 1 KN, the distance of center of gravity G is 6 m from point A. For the position given, determine the tension T in cable and reaction at B.
Steps for F-test The Steps followed in the F-Test are as follows: (A) State the hypothesis: Ho: Relationship between Y and all Xs is not significant. HA: Relationship bet
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