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Power Systems Articles
Page 16 of 19
Indirect Arc Furnace – Construction, Working, and Applications
Indirect Arc FurnaceAn electric arc furnace in which the heat is produced by striking the arc between two electrodes and then transferred to the charge to be heated is called an indirect arc furnace.In an indirect electric arc furnace, the electric arc does not come in contact with the charge but heat is transferred through radiation from the electric arc to the top surface of the charge and through conduction from the top surface to the bottom layer in the charge.Construction and WorkingThe construction of the indirect arc furnace is shown in the figure. The figure shows a rocking arc ...
Read MoreHigh Frequency Eddy Current Heating: Working, Advantages, Disadvantages and Applications
Eddy Current HeatingWhen the heating of the charge is done by the induced eddy currents in charge, it is known as eddy current heating.To heat the charge by eddy current heating process, the charge is placed inside a current carrying coil. The current is the high frequency alternating current. For this reason, this method is also called the high frequency eddy current heating. The alternating magnetic field produced by the coil sets up eddy currents in the charge to be heated. Consequently, the charge gets heated-up. The coil used for creating the magnetic field is known as heater coil or ...
Read MoreElectric Resistance Furnaces or Ovens: Types & Applications
Electric Resistance FurnaceThe resistance furnaces or ovens are the insulated closed chambers with a provision for ventilation. The resistance furnaces or ovens are used for heat treatment of metals, commercial or domestic heating, pottery work, etc.The different elements of the furnace can be energies from DC or AC supply of the rated voltage. The star-delta formation provides a wide variation of the temperature.In case of batch type resistance furnace, the charge is inserted in the furnace. The figure shows a typical batch type resistance furnace. Here, it is heated for a specific time at a specific temperature and then removed. ...
Read MoreDirect Horizontal Core Type Induction Heating Furnace
Induction Heating FurnaceAn electrical furnace in which the heat is produced by induction heating of metal, is called the induction heating furnace. The induction heating furnaces have the capacities range from less than 1 kg to 100 tons and are used to melt various metals like iron, copper, aluminium, etc.Direct Core Type Induction FurnaceThe schematic diagram of a direct horizontal core type induction heating furnace is shown in the figure below.It works on the transformer action in which the charge to be heated forms a single-turn short-circuited secondary winding and it is magnetically coupled to the primary winding through iron ...
Read MoreDirect Arc Furnace: Types, Electrical and Mechanical Requirements
An electric furnace is the furnace that heats materials by means of an electric arc is called the electric arc furnace (EAF).Direct Arc FurnaceThe direct arc furnace is the one in which the electric arc is struck between the electrode and the charge, to be heated, so that the arc current flows through the charge and there is a direct contact between the arc and the charge.In case of direct electric arc furnace, the heating process is faster and the heating efficiency is also high. In addition to the arc heating, some additional heat is produced by the passes of ...
Read MoreDifference between MIG Welding and TIG Welding
Metal Inert Gas (MIG) WeldingThe metal inert gas (MIG) welding is an electric arc welding process in which a continuous solid wire electrode is heated and fed into the weld pool from a welding gun. In case of MIG welding process, inert gas such as argon, helium, etc. is used as shielding gas to protect the weld pool from the atmospheric contamination.Tungsten Inert Gas (TIG) WeldingThe tungsten inert gas (TIG) welding is also an arc welding process in which the electric arc is struck between a non-consumable tungsten electrode and the workpiece. TIG welding is also known as Gas Tungsten ...
Read MoreDifference between Fusion Welding and Solid State Welding
Fusion WeldingThe welding process that uses heat to join (or fuse) two or more materials by heating them to their melting point is known as fusion welding. The fusion welding process may or may not require the use of filler material for welding. Examples of the fusion welding are arc welding, gas welding, resistance welding, etc.Solid State WeldingThe welding process in which two workpieces are joined under a pressure providing an intimate contact between them and at a temperature essentially below the melting point of the base materials is known as solid state welding. The materials being joined without the ...
Read MoreApplications of Dielectric Heating
The process of heating in which a high-frequency alternating electric field or radio waves or microwave electromagnetic radiation are used to heat the dielectric materials is known as dielectric heating.Applications of Dielectric HeatingSince the dielectric heating is an expensive method of heating, therefore, it is only used where other methods of heating are not possible. Some of the applications of the dielectric heating are described as follows −Plastic IndustryThe plastic is used for making many appliances. If the pre-heating of the plastic is uniform, then the molding of plastic becomes faster and fault free. This pre-heating of the plastic is ...
Read MoreAjax-Wyatt Vertical Core Type Induction Furnace
Induction Heating FurnaceAn electrical furnace in which the heat is produced by induction heating of metal, is called the induction heating furnace. The induction heating furnaces have the capacities range from less than 1 kg to 100 tons and are used to melt various metals like iron, copper, aluminium, etc.Vertical Core Type Induction FurnaceThe schematic diagram of the vertical core type induction furnace is shown in the figure below.The vertical core type induction furnace is also known as Ajax-Wyatt Furnace.This furnace has a vertical crucible instead of a horizontal one (as in case direct core type induction furnace) for the ...
Read MoreElectric Welding: Advantages of Coated Electrodes
Coated ElectrodeA coated electrode is made of a metallic wire (called core wire) coated uniformly with flux material. While fluxing, the electrode about 20 mm of its length is left bare at one end for mounting it into the electrode holder. The flux material used for coating of the electrode is a bad conductor of electricity.Coated electrodes are used these days because the flux coated on the core wire is composed of special element which protects both the arc and the weld metal that passes through range of liquid action and solidification during welding.Advantages of Coated ElectrodesThe coated electrodes are ...
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