Method Of Plastic Welding

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CHAPTER 1 INTRODUCTION Welding is characterized as a coalescence of metals produced by heating to a suitable temperature with or without the utilization of pressure, and with or without the utilization of a filler material. The procedure of welding discovers application in assembling vehicles, aeroplanes, rail mentors, machine segments, metal structures, boilers and boats. 1.1 Methods of welding There are two methods by which welding is performed 1.Plastic welding. 2.Fusion welding. 1.1.1 Plastic welding In this technique, the metal parts are heated to a plastic state. At this stage, pressure is connected to make a flawless joint. It is otherwise…show more content…
The tungsten electrode discovers its significant applications in highly alloyed sheet materials. In TIG welding, the electric arc is produced between a non-consumable tungsten electrode and the workpiece. Inert gas is supplied around the electrode. This gas surrounds the arc and protects the weld from atmospheric effects. This process is also called as Gas Tungsten-arc welding. Filler material may or may not be used. When filler metal is used, it is usually fed manually into the weld pool. In Metal Inert Gas Welding, the electric arc is produced between a consumable metal electrode and the workpiece. Arc and welding zone is surrounded by the inert gas. This inert gas protects the weld from the surroundings. This weld can be done manually or automatically. The current ranges from 100 to 400 A depending upon the current being used. It is used for welding aluminium, stainless steel, nickel, and magnesium without weld defects. No flux is required for this…show more content…
In this series of spots are welded at a time. The metal pieces to be welded are placed between two metal arms which acts as electrode. One of the work pieces has projections on its surface. Used for joining thin sheet of thickness upto 3mm. It is used in automobile industries, for mass production. 1.2.4 Thermo Chemical Welding Thermit welding falls under this class. Welding the parts by using liquid thermit steel around the portions to be welded is called thermit welding. In this process, neither arc is produced to heat parts nor flames are used. Welding principle is the heat of the thermit reaction used for welding in plastic state and mechanical pressure is applied for the joint. Thermit is a mixture of aluminium and iron oxide in the ratio of 1:3. 1.2.5 Solid State Welding Friction welding is a solid state welding process where joining is formed by the heat which is obtained from mechanically induced sliding motion between rubbing surfaces. In this welding, one part is rotated at high speed and the other part is stationary. During this period, metal is extruded from the weld region to form an upset. 1.2.6 Laser

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