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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.
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causes and remedy of coldshut,misruns,shirnkage cavity,microporosity,metal penetration,mismatch
Calculate number of cycles to fracture: If the plastic deformation is taken into consideration calculate number of cycles to fracture in above Example. Solution Δ K I
Find out change in length of circular bar of uniform taper Sol.: The stress at any cross section can be found by dividing load by area of cross section and extension can be
Layout design development is supported by a number of studies and reviews, including: • Hazard identification (HAZID Study) and risk assessments - both qualitative and quantita
(a) Following consideration were recorder during a test on a single cylinder oil engine : Bore = 300 mm; speed =300 r.p.r.; stroke = 450 mm; net break load = 1.5KN;
MANUFACTURING PROCESS A manufacturing process is the activity (or a combination of activities) of transforming a given material into a product of different forms and sizes and
Rich Mixture: It generally ranges from approximately 7 : 1 to 13 : 1 proportion of air to fuel by weight. To get a high power rich mixture is required. In fact to start the e
Drivers for a common international standard The drivers for a common international standard included : Global commerce and data exchange; Increasingly complex produ
For a theoretical OTTO cycle operating on compression ratio of 8.5:1taking in air at 15C and 101.3kPa and having a maximum cycle temp of 1800C.Calculate the temp after compression,
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