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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:
Q. Identification of Pressure Welds? Pressure welds shall be identified as follows: a. Generally each weld shall be stamped adjacent to the weld with the welder's identity c
Q. Insulation on Flanges and Valves? Valves, flanges, and unions shall not normally be insulated unless specified by OWNER. All other fittings are to be insulated. Fittings
what are the tests to carried out after mockup preparation
Heat Treating Equipment: The major equipment for heat treatment is furnace. There are two main categories of furnaces - batch and continuous. The furnace selection needs cons
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Work done - thermodynamics: A free expansion process is a process in which system expands freely without experience any resistance. I.E. is constant at the time of state chang
Q. Define Pattern draft or taper? It is also termed as "draw". It is the taper placed on the pattern surface that are parallel to the direction in which the pattern is withdraw
Roller conveyors are flat circular or spiral. They consist of rollers supported in frames over which materials are allowed to move. They are driven through gravity. Genera
Ask question Prove maximum fluctuation of energy ?E=2ECS.
Product Holon The product holon serves as the knowledge base for the manufacturing system. This can be portrayed like an information server to the other holons concerned in the
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