Fundamentals of MIG welding

Metal inert gas (MIG) is sometimes referred to as gas metal arc welding (GMAW) or metal active gas (MAG) welding. It is one of the easiest welding processes to learn. Most people can learn to run good beads with MIG in just a few hours. Originally developed for welding aluminium and other non-ferrous materials in the 1940s, GMAW was soon applied to steels because it allowed for lower welding time compared to other welding processes. The cost of inert gas limited its use in steels until several years later, when the use of semi-inert gases such as carbon dioxide became common. Further developments during the 1950s and 1960s gave the process more versatility and as a result, it became a highly used industrial process. Today, GMAW is the most common industrial welding process, preferred for its versatility, speed and the relative ease of adapting the process to robotic automation. The automobile industry in particular uses GMAW welding almost exclusively. Unlike welding processes that do not employ a shielding gas, such as shielded metal arc welding, it is rarely used outdoors or in other areas of air volatility. A related process, flux cored arc welding, often does not utilise a shielding gas, instead employing a hollow electrode wire that is filled with flux on the inside. MIG welding uses a consumable electrode, or solid electrical conductor, made of a filler metal wire. An electric arc forms between the electrode and sheet metal being welded. An inert gas surrounds the weld protecting it from oxidation. This method works with carbon steels, low alloy steels, stainless steels and most aluminium, copper and zinc alloys. MIG welding can be used to weld metals with thicknesses ranging from two-tenths to one-quarter inch (.5 mm to 6.3 mm). MIG welding is less expensive and does not require a high level of expertise from the operator. The weld is messier, however, because of the use of the consumable electrode, or filler material. Metal inert gas is usually used in shops and factories, because out in the field, the wind displaces the shielding gas, which, ironically, is there to displace the wind. You have to be careful MIG welding in close quarters, because some of the shielding gases, such as argon, can displace the oxygen in your brain or collapse your lungs, causing you to wake up dead. Development The principles of gas metal arc welding began to be understood in the early 1800s, after Humphry Davy's discovery of the electric arc in 1800. At first, carbon electrodes were used, but by the late 1800s, metal electrodes had been invented by N.G. Slavianoff and C. L. Coffin. In 1920, an early predecessor of GMAW was invented by P. O. Nobel of General Electric. It used a bare electrode wire and direct current, and used arc voltage to regulate the feed rate. It did not use a shielding gas to protect the weld, as developments in welding atmospheres did not take place until later that decade. In 1926 another forerunner of GMAW was released, but it was not suitable for practical use. It was not until 1948 that GMAW was finally developed by the Battelle Memorial Institute. It used a smaller diameter electrode and a constant voltage power source, which had been developed by H. E. Kennedy. It offered a high deposition rate, but the high cost of inert gases limited its use to non-ferrous materials and cost savings were not obtained. In 1953, the use of carbon dioxide as a welding atmosphere was developed, and it quickly gained popularity in GMAW, since it made welding steel more economical. In 1958 and 1959, the short-arc variation of GMAW 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 most popular GMAW variation. The spray-arc transfer variation was developed in the earAir Jordan 2017 Casual Shoes