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A welder is a person or equipment that fuses materials together.The term welder refers to the operator, the machine is referred to as the welding power supply.The materials to be joined can be metals (such as steel, aluminum, brass, stainless steel etc.) or varieties of plastic or polymer.
In addition to welders and welding machine operators, there are also schemes to independently certify welding inspectors and related specialities. The duties of the welding inspector are described in ISO 14731; [12] however the requirement for inspector certification are not standardized, so there are differences in requirement between the various schemes.
Welding is a fabrication process that joins materials, usually metals or thermoplastics, ... The type of current used plays an important role in arc welding ...
Practicing welders may have more experience with the technique (holding the wire and torches just right to make an excellent weld rather than a poor one, analogously to how a musician must play a musical instrument just right, with highly practiced deftness of fine motor control, in order to produce an excellent sound rather than a poor one ...
Tradesmen/women are contrasted with laborers, agricultural workers, and professionals (those in the learned professions). [3] Skilled tradesmen are distinguished: from laborers such as bus drivers, truck drivers, cleaning laborers, and landscapers in that the laborers "rely heavily on physical exertion" while those in the skilled trades rely on and are known for "specific knowledge, skills ...
The American Welding Society (AWS) was founded in 1919 as a non-profit organization to advance the science, technology and application of welding and allied joining and cutting processes, including brazing, soldering and thermal spraying.