Published On : 05 Jun 2018
Welding refers to a sculptural or fabrication process that joins materials which is generally metals or thermoplastics, by causing fusion. It is distinct from lower temperature metal-joining techniques such as soldering and brazing, which do not melt the base metal. In addition to melting of the base metal, a filler material is generally added to the joint in a bid to form a pool of molten material (the weld pool) that cools down to form a joint that, based on weld configuration (butt, fillet, full penetration, etc.), can be stronger as compared to the base material i.e. parent metal. Pressure might also be used in together with heat, or by itself, in a bid to produce a weld. Welding also needs a form of shield so as to protect the melted metals or filler metals from being oxidized or contaminated.
Though less common, there are also solid state welding processes like friction welding in which the base metal does not melt.
A few of the best known welding methods comprise:
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