|Metal Insert Gas (MIG) and Metal Active Gas (MAG) Welding
Is a welding process in which an electric arc forms between a consumable wire electrode and the work piece (metal),
which heats the work piece (metal), causing them to melt, then join. Along with the wire electrode, a shielding gas feeds through
the welding gun, which shields the process from contaminants in the air.
|Flux Cord Arc Welding (FCAW)
Is a semi-automatic or automatic arc welding process. FCAW requires a continuously-fed consumable tubular electrode
containing a flux and a constant-voltage or, less commonly, a constant-current welding power supply. An externally supplied
shielding gas is sometimes used, but often the flux itself is relied upon to generate the necessary protection from the atmosphere,
producing both gaseous protection and liquid slag protecting the weld. The process is widely used in construction because of its
high welding speed and portability.
|Manual Metal Arc (MMA) Welding
Manual arc welding process that uses a consumable electrode coated in flux to lay the weld. An electric current, in the form
of either alternating current or direct current from a welding power supply, is used to form an electric arc between the electrode
and the metals to be joined. As the weld is laid, the flux coating of the electrode disintegrates, giving off vapours that serve as a
shielding gas and providing a layer of slag, both of which protect the weld area from atmospheric contamination.
|Tungsten Insert Gas (TIG) Welding
Is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area is protected from
atmospheric contamination by an inert shielding gas (argon or helium), and a filler metal is normally used, though some welds, known
as autogenous welds, do not require it. A constant-current welding power supply produces energy which is conducted across the
arc through a column of highly ionized gas and metal vapours known as a plasma.
|Air Carbon ARC Gouging
Is an arc cutting process where metal is cut and melted by the heat of a carbon arc. Molten metal is then removed by a blast of
air. It employs a consumable carbon or graphite electrode to melt the material, which is then blown away by an air jet.