Gas metal arc welding
Gas metal arc welding (GMAW) was developed in the 1940s for welding aluminium and other non-ferrous materials. It was soon applied to steels because it provided faster welding time compared to other welding processes. GMAW is the most common industrial welding process, preferred for its versatility, speed and the relative ease of adapting the process to robotic automation.
About Gas metal arc welding in brief
Gas metal arc welding (GMAW) was developed in the 1940s for welding aluminium and other non-ferrous materials. It was soon applied to steels because it provided faster welding time compared to other welding processes. GMAW is the most common industrial welding process, preferred for its versatility, speed and the relative ease of adapting the process to robotic automation. Unlike welding processes that do not employ a shielding gas, it is rarely used outdoors or in other areas of moving air. A related process, flux cored arc welding, often does not use a shieldingGas, but instead employs an electrode wire that is hollow and filled with flux. The process is often used for arc spot welding, replacing riveting or resistance spot welding. It is also popular for automated welding, where robots handle the workpieces and the welding process to accelerate manufacturing. G MAW can be difficult to perform well outdoors, since drafts can dissipate contaminants into the welding gun and allow better shielding gas to be used. The typical GMAw welding gun has a number of parts—a wire feed unit, a power supply, a contact switch, a nozzle, an electrode liner and a power cable. To perform the basic gas metal welding, the basic equipment is a wire feeding unit, power supply and electrode wire. The welding gun can also be used to perform shielded metal welding via tungsten arc welding or gas cored welding, which is more commonly performed underwater. It can be semi-automatic or automatic. A constant voltage, direct current power source is most commonly used with GMAWs.
There are four primary methods of metal transfer, called globular, short-circuiting, spray, and pulsed-spray, each of which has distinct properties and corresponding advantages and limitations. The spray-arc transfer variation was developed by experimenters in the early 1960s, when experimenters added small amounts of oxygen to inert gases. More recently, pulsed current has been applied, giving rise to a new method called the pulsed spray-Arc variation. GmaW is one of the most popular welding methods, especially in industrial environments. It’s used extensively by the sheet metal industry and the automobile industry and is used extensively in construction and manufacturing industries. It does not lend itself to underwater welding, such as in construction or underwater construction. It offers a high deposition rate, but the high cost of inert gases limited its use in steels until several years later, when the use of semi-inert gases such as carbon dioxide became common. In 1953, carbon dioxide as a welding atmosphere was developed, and it quickly gained popularity in GMA W, since it made welding steel more economical. In 1958 and 1959, the short-arc variation was released, which increased welding versatility and made the welding of thin materials possible while relying on smaller electrode wires and more advanced power supplies. It quickly became the mostpopular GMAV variation. In 1948, GMA w was developed. It used a smaller diameter electrode and a constant voltage power source developed by H. E. Kennedy.
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This page is based on the article Gas metal arc welding published in Wikipedia (as of Nov. 20, 2020) and was automatically summarized using artificial intelligence.
