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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.
Q. Describe about Chain-wire and tape gauges? Chain, wire and tape gauges are fixed on structures like bridges and the weight is lowered to touch the water surface. Movable sti
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An experiment to determine the convection coefficient associated with airflow over the surface of a thick stainless steel casting involves insertion of thermocouples in the casting
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Determine the forces in strings: The Electric light fixture weighing 15N hangs from point C , by two strings AC and BC . AC is inclined at 60° to the horizontal and BC
Petrol: Work in a well-ventilated area. Keep flames or sparks away from the work area or where petrol is stored.
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Determine the maximum shear stress and angle of twist: A hollow circular shaft of 6 m length and inner & outer diameter ois equal to 80 mm and 100 mm is subjected to a torq
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(a) What are the basic conditions for a body to be in state of equilibrium? (b) Two steel cylinders of similar diameter are supported in a rectangular vessel. The width of the v
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