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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:
Goods Market and the IS Curve The IS curve shows the combinations of interest rates and levels of output such that planned spending equals income. In order to derive the IS cur
engineering dynamics problems of kinetics of particle
Motion of the boat: (i) A man having weighs 500 N and is in a boat weighing 1500 N which is free to move over a steady lake. If he begins running along the length of the boat
Q . Determine MI of unequal angle section 15cm × 10cm × 1.5cm with longer leg vertical and is flange upwards. Figure Sol. : A 1 = 10 ×
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can we use electrical power chuck for job clamping in cnc lathe.what are the issues related
Find out the smallest force: A block weighing 800 N is raised up with the help of two 6o wedges B and C of negligible weights as illustrated in Figure. If the coefficient of s
To design a cantilevered truss to support the loads shown in the figures, two layouts are proposed as shown in Figs. A and B. All truss members are steel with allowable stress of 2
what is boiler. give all things about boiler. 1 specifica 2 mounting 3 acessories 4 advantages 5 maintinance
Drive the expression for critical pressure ratio for steam nozzle and illustrate critical pressure. Air flows in a 200cm 2 duct at a velocity of 180 m/s, a pressure of 119 KPa
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