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Many people do welding work for a living. Welding means pieces of materials are joined together. A welder can join certain metals like steel aluminum, brass, stainless steel, plastic or polymer. Welder also means equipment used for welding process. There are various types of welding like Arc welding, MIG Welding, TIG Welding etc.
MIG (Metal Inert gas) welding is also called as GMAW (gas metal arc welding) is generally used for welding aluminum and other non-ferrous metals. The major advantage of this type of welding is that metals can be welded much quicker than traditional welding “stick welding” techniques. It can be used with a variety of metals and alloys. MIG welding produces a clean weld with very little splatter.
TIG (Tungsten inert gas) welding is a process of blending together reactive metals such as magnesium and aluminum. During the process of TIG welding, an arc is formed between a pointed tungsten electrode and the area to be welded. As a result of the gas shield, a clean weld is formed. This prevents oxidization from occurring. TIG welding can be used for different joints like butt joint, lap joint, corner joint and t-joint.
Gas metal arc welding (GMAW) is an automatic or semi-automatic welding process. Shielding gas and a continuous, consumable wire electrode are fed through a welding gun. GMAW uses a constant power source such as voltage or a direct current to weld together materials such as steel and aluminum. This welding is generally used in sheet metal industry. The equipment used in GMAW is a welding gun; a wire feed unit, an electrode wire and a shielding gas supply.
Arc welding is done through the use of an electrical current, and can be performed by using inexpensive equipment. Resistance welding involves the use of additional sheets of metal to encase the pieces to be welded together. It is the most environmentally-friendly of all methods, but it requires costly equipment that cannot be used in all situations. Energy beam welding, also known as laser beam welding, is one of the most modern techniques used. Laser welding is fast and accurate, but the high equipment cost makes it prohibitive for many industries.
Welding cannot be done with all types of metals, as some materials, such as stainless steel, are prone to cracking and distortion when overheated. Alloys are particularly problematic, since it’s hard to know the exact chemical composition of the metal. Welding has become highly automatized over the last decade, and the use of welding robots is now commonplace in certain industries, such as the automotive manufacturing plants.
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