A fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing fusion, which is distinct from lower temperature metal.
Simply, welding is a way to make high strength joints between two or more parts. There are many ways to do this and these require a high degree of skill and advanced technology. Welders work with a lot of different metals, alloys and materials – heating, melting and joining these ‘composites’ together.  Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing fusion, which is distinct from lower temperature metal-joining techniques such as brazing and soldering, which do not melt the base metal. Gas tungsten arc welding (GTAW), or tungsten inert gas (TIG) welding, is a manual welding process that uses a nonconsumable tungsten electrode, an inert or semi-inert gas mixture, and a separate filler material. SMAW is a welding process that uses a flux covered metal electrode to carry an electrical current. The current forms an arc that jumps a gap from the end of the electrode to the work. The electric arc creates enough heat to melt both the electrode and the base material(s).  Welding has been called, “the best kept secret” in career planning. Welding is widely used in construction, manufacturing, and many other industries, making it a critical skill that will always be in demand. From the beginning of civilization, we have relied on the skills of welders to enrich our lives. Welding is the process of joining metals by melting the parts and then using a filler to form a joint. It can be done using different energy sources, from a gas flame or electric arc to a laser or ultrasound. Arc welding makes use of an electrical current. Welders wear special helmets and gloves for protection. Welders use extreme heat that is supplied by either an electrical current or gas to connect two metal surfaces. There are various types of welding. A closeup of welding. Welding is the act of joining two metals or thermoplastics by heating them. Welding goggles 1 Gas tungsten arc welding (GTAW) - also known as TIG (tungsten, inert gas), uses a non-consumable tungsten electrode to produce the weld. 2  The weld area is protected from atmospheric contamination by an inert shielding gas such as Argon or Helium. Gas tungsten arc welding (GTAW), or tungsten inert gas (TIG) welding, is a manual welding process that uses a nonconsumable tungsten electrode, an inert or semi-inert gas mixture, and a separate filler material. 1 Gas metal arc welding (GMAW) - commonly termed MIG (metal, inert gas), uses a wire feeding gun that feeds wire at an adjustable speed and flows an argon-based shielding gas or a mix of argon and carbon dioxide (CO 2) over the weld puddle to protect it from atmospheric contamination. Gas tungsten arc welding (GTAW), or tungsten inert gas (TIG) welding, is a manual welding process that uses a nonconsumable tungsten electrode, an inert or semi-inert gas mixture, and a separate filler material. This type of welding uses an electrical power source to create an arc between the base metal and an electrode stick or wire. The arc is struck by turning on the welding machine, adjusting the settings, getting safety gear and materials in place and then scratching or tapping the electrode against the base metal. TIG welding is one of the more difficult welding processes to learn and is most often used to weld very thin pieces of stainless steel and non-ferrous metals such as magnesium and aluminum. Filler metal is added to the weld from a tungsten rod that is separate from the electrode. Gas metal arc welding (GMAW), also known as metal inert gas or MIG welding, is a semi-automatic or automatic process that uses a continuous wire feed as an electrode and an inert or semi-inert gas mixture to protect the weld from contamination. Gas tungsten arc welding (GTAW), or tungsten inert gas (TIG) welding, is a manual welding process that uses a nonconsumable tungsten electrode, an inert or semi-inert gas mixture, and a separate filler material.
http://www.theweldinginstitute.com/education-and-development/what-is-welding/ https://en.wikipedia.org/wiki/Welding http://www2.mae.ufl.edu/designlab/Lab%20Assignments/EML2322L-Welding.pdf https://app.aws.org/pr/welding.pdf http://www.wisegeek.org/what-is-welding.htm https://en.wikipedia.org/wiki/Welding https://en.wikipedia.org/wiki/Welding https://www.weldingschool.com/articles/whatisarc/ https://en.wikipedia.org/wiki/Welding
what is welding