Gas metal arc welding (GMAW), sometimes referred to by its subtypes metal inert gas (MIG) and metal active gas (MAG) is a welding process in which an electric arc forms between a consumable MIG wire electrode and the workpiece metal(s), which heats the workpiece metal(s), causing them to fuse (melt and join). Along with the wire electrode, a shielding gas feeds through the welding gun, which shields the process from atmospheric contamination.
The process can be semi-automatic or automatic. A constant voltage, direct current power source is most commonly used with GMAW, but constant current systems, as well as alternating current, can be used. There are four primary methods of metal transfer in GMAW, called globular, short-circuiting, spray, and pulsed-spray, each of which has distinct properties and corresponding advantages and limitations.
Originally developed in the 1940s for welding aluminium and other non-ferrous materials, GMAW was soon applied to steels because it provided faster 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. 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 moving air. A related process, flux cored arc welding, often does not use a shielding gas, but instead employs an electrode wire that is hollow and filled with flux.
and 25 Related for: Gas metal arc welding information
Gas tungsten arcwelding (GTAW, also known as tungsten inert gaswelding or TIG, and heliarc welding when helium is used) is an arcwelding process that...
Arcwelding is a welding process that is used to join metal to metal by using electricity to create enough heat to melt metal, and the melted metals, when...
Shielded metalarcwelding (SMAW), also known as manual metalarcwelding (MMA or MMAW), flux shielded arcwelding or informally as stick welding, is a manual...
Shielding gases are inert or semi-inert gases that are commonly used in several welding processes, most notably gasmetalarcwelding and gas tungsten arc welding...
Plasma arcwelding (PAW) is an arcwelding process similar to gas tungsten arcwelding (GTAW). The electric arc is formed between an electrode (which is...
processes such as shielded metalarcwelding, gas tungsten arcwelding, and gasmetalarcwelding. They are necessary to prevent arc eye, a painful condition...
from Shielded MetalArcWelding (SMAW) to inert shielding gas like Gasmetalarcwelding (GMAW) or Gas tungsten arcwelding (GTAW). Welding power supplies...
tungsten inert gas (TIG) welding. Also known as manual metalarc (MMA) welding or stick welding. Also known as electric resistance welding (ERW). "جوشکاری...
the part. Processes such as gasmetalarcwelding, while often automated, are not necessarily equivalent to robot welding, since a human operator sometimes...
Most arcwelding processes such as shielded metalarcwelding (SMAW), flux-cored arcwelding (FCAW), gas tungsten arcwelding (GTAW), gasmetalarc welding...
the arc) from the reactive gases in air which can cause porosity in the solidified weld puddle. Inert gases are also used in gasmetalarcwelding (GMAW)...
replaced by gasmetal-arcwelding, mainly because of the availability of inexpensive inert gases. The Inside of Atomic Hydrogen ArcWelding, Part 1 - 1943...
Submerged arcwelding (SAW) is a common arcwelding process. The first SAW patent was taken out in 1935. The process requires a continuously fed consumable...
purpose of arcwelding is to form a bond between separate metal pieces. In carbon-arcwelding a carbon electrode is used to produce an electric arc between...
the welding process. Crater cracks occur when a weldingarc is broken, a crater will form if adequate molten metal is available to fill the arc cavity...
Laser beam welding (LBW) is a welding technique used to join pieces of metal or thermoplastics through the use of a laser. The beam provides a concentrated...
Fillet welding refers to the process of joining two pieces of metal together when they are perpendicular or at an angle. These welds are commonly referred...
oxyacetylene and gas tungsten arcwelding. Powder metal alloys are used in plasma-transferred arc (PTA), also called powder plasma welding, and thermal spray...
both arc and flame contact welding to create artwork. Arcwelding is one of the many types of fusion welding. Arcwelding joins two pieces of metal together...
Most underwater welding is direct current wet stick welding, and most underwater metal cutting is immersed oxygen-arc and shielded metal-arc cutting, though...
heat of the weldingarc causes the electrode and workpieces to melt and flow into the cavity between the parts being welded. This molten metal solidifies...