Found 65 Articles for Transmission of Electric Power

What is Gas Metal Arc Welding?Gas metal arc welding (GMAW) is a semi-automatic or automatic arc welding process in which a continuous and consumable wire electrode and a shielding gas are fed through a welding gun. The gas metal arc welding is also known as metal inert gas (MIG) welding or metal active gas (MAG) welding. MIG and MAG are the subtypes of the gas metal arc welding.Gas metal arc welding was originally developed for welding aluminum and other non-ferrous materials in the 1940s. Although, the gas metal arc welding was soon applied to steels as it allowed for smaller ... Read More

Electron Beam WeldingElectron beam welding (EBW) is a welding process in which a beam of high velocity electrons is applied to the materials being joined or fused. When these high velocity electrons impact the workpieces, the kinetic energy of the electrons is transformed into heat, which melts the workpieces.The first practical electron beam welding machine was developed by a German physicist Karl-Heinz Steigerwald in 1958. In order to prevent the distortion of the electron beam, the electron beam welding is performed in vacuum.Working Principle of Electron Beam WeldingA typical schematic of the electron beam welding (electron beam gun) is shown ... Read More

Electric WeldingThe process of joining materials together through the use of heat that is produced by an electric current is known as electric welding.Electric welding is often done by melting the workpieces by the heat produced by electric current and adding a filler material to form a pool of molten material that cools to become a strong joint.In other words, the branch of welding in which electric current is used to produce the large heat required for joining of pieces of metals together is called the electric welding.The electric welding is gaining acknowledgement, because of its machinery is inexpensive and ... Read More

What is Electric Arc Welding?The process of welding in which heat is produced by creating an electric arc to join metal workpieces is known as electric arc welding.Electric arc welding is a type of welding that uses a welding power supply to create an electric arc between a metal stick, called electrode, and the workpiece to melt the metals at the point of contact.Electric arc welding can use either DC supply or AC supply and a consumable or non-consumable electrode.Working Principle of Electric Arc WeldingThe process of electric arc welding is based on the principle that, when electric current is ... Read More

Electric Arc FurnaceAn electric furnace is the furnace that heats materials by means of an electric arc is called an electric arc furnace (EAF). Electric arc furnaces are mainly used for melting or extracting of ferrous or non-ferrous metals which need a high temperature operation. The electric arc furnace produces an electric arc which gives an arc temperature between 3000 °C and 3500 °C on L.T. (Low Tension) operation.Basically, the electric arc is nothing but the flow electric current through an air gap between two conducting electrodes.Working of Electric Arc FurnaceFrom the working of an electric arc furnace simply means ... Read More

What is 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.Dielectric heating is also known as electronic heating, radio frequency (R.F.) heating, high frequency heating and diathermy.Dielectric heating is mainly used for heating of insulators like wood, plastics and ceramics, etc. which cannot be heated easily and uniformly by the other methods of heating.The frequency of the input supply required for dielectric heating ranges from 10 MHz to 15 MHz and the applied voltage is 20 kV.Principle of ... Read More

During the welding process by the gas welding or arc welding, the gas flame or electric arc can be moved towards the direction of weld progression or opposite to the direction of the weld progression. Depending upon the direction of the move of flame or arc with respect to the weld bead, the welding techniques can be classified into two types viz −Forehand WeldingBackhand WeldingForehand WeldingThe gas or arc welding technique in which the flame or electrode advances in the direction of the weld progression is known as forehand welding. It is also known as push welding or forward welding. ... Read More

There are various methods to control the temperature of the resistance heating at certain selected points in a furnace or oven, as per certain limits. The temperature control of resistance heating may be required in order to hold the furnace temperature constant or to vary it as per the requirements and it can be carried out manually or automatically.In case resistance furnaces or ovens, the developed heat is given by, $$\mathrm{\mathit{H}\:=\:\mathit{I^{\mathrm{2}}Rt}\:=\:\frac{\mathit{V^{\mathrm{2}}}\mathit{t}}{\mathit{R}}}$$Therefore, the temperature of resistance furnaces can be controlled by any of the following methods −By intermittent switching or ON-OFF ControlBy changing circuit configurationBy varying the applied voltageBy varying number ... Read More

The device which receives electrical energy as input and converts it into the heat energy is known as a heating element.The wire employed for the heating element may be circular or rectangular. By determining the electrical input and its voltage, the size (or diameter) and length of the wire required as the heating element to produce the given temperature can be calculated.Design of Heating ElementConsider the heating element is in the circular shape. Therefore, the length and diameter of the heating element can be calculated as follows −According to the Stefan's law, the heat dissipated is given by, $$\mathrm{\mathit{H}\:=\:5.72\:\mathit{Ke}\mathrm{\left [ ... Read More

Shielded Metal Arc WeldingThe shielded metal arc welding (SMAW) is a type of electric arc welding in which coalescences of metals is produced by heat from an electric arc created between the tip of a consumable electrode and the surface of the base material at point of welding.The shielded metal arc welding (SMAW) is also known as manual metal arc welding (MMAW), flux shielded arc welding or stick welding. The shielded metal arc welding is a manual arc welding process which uses a consumable electrode coated in flux to lay the weld. An electric current, either AC or DC, is ... Read More