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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.
Dead Centre The position of the working piston and the moving parts which are mechanically connected to it, at the moment when the direction of the piston motion is reserved
deravsion of torsion
Define marginal revenue?
explain investment casting with neat sketch
Define different regimes of boiling and depict their ranges on a excess temperature curve us heat flux. Also distinguish between laminar film condensation and dropwise condensation
Q. Wha t do you mean by section modulus ( Z )? What is value of bending moment in the terms of section modulus? Sol.: Section modulus is ratio of M.I. about neutral ax
slip of belt
Applications of spot welding As spot welding can be employed for Al, Cu, Ni and Mg alloys. It is not advisable to spot weld steels with carbon content greater than 0.25 % unles
Planning of Railway Stations and Facilities Provided: The planning of railway stations should cover the following aspects: (a) The site selected should be easily ac
Different types of information units of CAD There are different types of information units defined. They are : Class 0 The geometric primitives needed for describing 2- a
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