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SHIELDING GASES
Shielding gas is directed by the torch to the arc and weld pool to protect the electrode and the molten weld metal from atmospheric contamination.
Argon and helium or mixtures of the two are the most common types of inert gas used for the shielding. Argon hydrogen mixtures are used for special applications.
A nozzle of 50 mm. dia. delivers a stream of water that strikes a flat plate which is held normal to the axis of stream. If the issuing jet has a velocity of 15 m/sec., determine:
Prepare a design of close coiled helical compression spring for a service load ranging from 2250 N to 2750 N. The axial deflection of the spring for the load range is 6 mm. Conside
Evaluate the maximum bending stresses: A beam of I-section illustrated in Figure is simply supported over a span of 10 m. It carries an uniform load of 4 kN/m over the whole s
Simply Supported Beam: Simply Supported Beam: The beam on which both ends are supported, either by point load or hinged or roller support.
Brinel l Hardness Test: Insert the Ball of diameter D in ball holder of machine. Make specimen surface free from dust and dirt. Make contact between the surface and ball b
design guideways
how calculate a stress intensity factor theoritcal?
briefly
Compare Rankine cycle with Carnot cycle: Sol.: Rankine cycle without superheat: 1 - A - 2 - 3 - 4 - 1. Rankine cycle with superheat : 1 - A - 2 - 2′ -3′ - 4 - 1.
Relationship between two specific heat ? Sol: dQ = dU + dW; for a perfect gas dQ at constant pressure dU at Constant volume; = mC v dT = mC v (T 2 - T 1 ) dW at
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