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WIRE MELTING CHARACTERISTICSA non linear relationship exists between the rate at which the wire is fed into the arc and the current required to burn it off to maintain a constant arc length. This is known as the burn off characteristic and differs for each filler wire composition and diameter. The curves shown in Fig. illustrate the burn off characteristics of steel in Argon + O2 mixture. It will be seen that to alter the welding current a proportionate increase in the wire feed rate is required. The smaller the diameter of the wire, the faster is the wire feed speed required to reach the same current.
Explain about the Raft Foundations The raft foundations are generally used for large loaded area on soils of low bearing capacity. They are of particular use when soils are of
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Main Factors to be Considered when Selecting Material The main factors to be considered when selecting a material to meet some specific requirement are: Fitness of use,
Mash stitch welding An overlap of about 1.15 mm is kept and then the plates are squeezed flash by application of pressure at hot condition. Mash stitch welding is used in the
An axial flow pump handling oil of specific gravity 0.8 at a rate of 1.0m3 s-1 is fitted with downstream guide vanes and its impeller rotates at 250 rev min-1. The oil approaches t
The mass flow rate is 28kg/s in an axial flow gas turbine that develops 3.5MW. The stagnation conditions are 780KPa and 730 deg.C. at the entry. At the exit of the nozzle, the stat
Need a basic explanation of how to go about doing a plane strain analysis of a pressure vessel
Machine and Tool Selection The quality of a product largely depends on the type of machine, the type of process, machining conditions and the right selection of tools. The cur
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