Welding Workshop 

Understanding the Diferences between Heat Treatment, Annealing, and Tempering!

Heat Treatment, Annealing, and Tempering are three well-known methods for giving treatment to metals. Depending on the treatment used, a material may become more or less brittle, harder or softer, or stronger or weaker. The method chosen depends on the desired characteristics of the material. If steel is being treated, for instance, the designer may desire an end material with a high tensile strength but a relatively low degree of brittleness. In order to achieve the desired levels, the designer may make use of several treatments, alter the temperature at…

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Introduction to Heat Treatment

Heat treatment is an operation or combination of operations, involving heating and cooling of a metal or alloy in the solid state for the purpose of changing the properties of the metal. Heat treatment consists of three phases. (a) Heating of the metal. (b) Soaking of the heat into metal. (c) Cooling of the metal. Purpose of Heat Treatment The purpose of heat treatment is as follows: (a) To improve machinability. (b) To improve mechanical properties, e.g., tensile strength, ductility, hardness and shock resistance. (c) To relieve the stress induced…

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Furnaces Used for Heat Treatment

Heat treatment furnace may be defined as a refractory-lined chamber in which the metal part to be heat-treated, is heated to the required temperature. Usually a heat-treatment furnace is a box-like structure i.e., a steel shell with an access door, a refractory lining, temperature controls and indicators. Furnaces used for heat treatment are classified as: (a)    Hearth furnace             (i)         Stationary hearth furnace             (ii)        Movable hearth furnace (b)    Bath furnace             (i)         Salt bath             (ii)        Lead bath             (iii)       Oil bath Stationary Hearth Furnaces        These are of…

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