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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:
Question 1 For an equilibrium cooled alloy of 92%D/8%C, which of the above diagrams best represents the microstructure at 0°C? Question 2 For an equilibrium cooled allo
a) Describe main advantages and disadvantages of CI engine as compared to SI engine. b) With the help of a neat diagram, describe the working of a four stroke petrol engine.
Constant Mesh Type Gear Box : Most of the gearboxes on motorcycles are "constant mesh". That means all the gears are constantly meshed with one another and are always spinnin
Advantages and disadvantages
Q. What is thermoplastic plastics ? These plastic soften under heat, harden on cooling, and can be resoften under heat. Thus, they retain their fusibility, solubility, an
Q. Find out M.I. of T section as shown in figure given below about X - X and Y - Y axis through center of gravity of the section. Figure Sol.:
Classification of Cast Iron: CI having C in form of cementite is named as white cast iron. Microstructure of that CI consists of pearlite, cementite and ledeburite. Whether C
What is Drilling It is an operation by which holes are produced in solid metal by means of revolving tool known as „Drill?. The various operations on drilling machine.
Advantages of Casting Process: Electric Furnace : The melting of steel by electric furnaces developed rapidly for the availability of cheap electric power. Electricity is us
Find out the axial moment of inertia: Find out the axial moment of inertia of a rectangular area of base b and height d around centroidal axis GX and the base B 1 B 2 . So
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