Welding
Welding, Spot Welding, TIG Welding, MIG Welding, General Welding
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Welding is a fabrication process that joins materials, usually metals or thermoplastics, by creating a join. Sometimes pressure is used alongside heat or by itself to form the join between two materials, but usually it is done by melting the two or more pieces and with the addition of heat and a filler material, which then forms a molten material which cools to form a strong join to create the weld.
Spot welding is a type of resistance welding used to weld various sheetmetals. typically in the 0.5-3.0mm thickness range. The process uses two shaped copper alloyelectrodes to concentrate welding current and force between the materials to be welded. The result is a small "spot" that is quickly heated to the melting point, forming a nugget of welded metal after the current is removed. Applying the current for too long can result in molten metal being expelled as weld splash, or can even burn a hole right through the materials being welded.
Tungsten inert gas (TIG) welding , is an arc welding process that uses a nonconsumable tungsten electrode to create the weld. The weld area is protected from atmospheric contamination by a shielding gas (usually an inert gas such as argon) and a filler metal is normally used as well, but 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.
Metal inert gas (MIG) welding or metal active gas (MAG) welding, is a semi-automatic or automatic arc welding process in which a continuous and consumable wire electrode and a shielding gas are fed through a welding gun.
Definitions and terms on this page taken from the Open Source dictionary, WikiPedia 