Carbon arc welding
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'''Carbon Arc Welding''' ('''CAW''') is a process which produces coalescence of metals by heating them with an arc between a nonconsumable [[carbon]] ([[graphite]]) [[electrode]] and the work-piece. It was the first arc-welding process ever developed but is not used for many applications today, having been replaced by [[twin carbon arc welding]] and other variations. The purpose of arc welding is to form a bond between separate metals. In carbon arc welding a carbon electrode is used to produce an electric arc between the electrode and the materials being bonded. This arc produces extreme temperatures in excess of 30,000°C. At this temperature the separate metals form a bond and become welded together.
== Development ==
{{main|Arc welding#Development}}
CAW could not have been created if not for the discovery of the [[electric arc]] by [[Sir Humphry Davy]] in 1800.
== Variations ==
* [[Twin carbon arc welding]] ('''TCAW''') in which the arc is established between two carbon electrodes
* Gas carbon arc welding ('''CAW-G''') no longer has commercial significance. Other processes that use shielding gases have also replaced carbon arc welding such as ''tungsten-arc welding'' (GTAW, or TIG), ''plasma-arc welding'' (PAW), and ''atomic-hydrogen welding'' (AHAW). Each of these processes, including carbon arc welding, use a non consumable electrode. A filler metal is generally used to aid the bond in the workpieces.
(Picture provided by Answers.com, http://www.answers.com/topic/carbon-arc-welding?cat=technology)<!-- Image with unknown copyright status removed: [[Image:carbon-arc-diagram.jpg]] -->
== References ==
* ''Welding handbook Volume 2, eighth edition.'' Library of Congress number: 90-085465 copyright 1991 by American Welding Society
== External links ==
* [http://www.aws.org/ The American Welding Society]
* [http://www.weldinginspectionsvcs.com/WeldingProcessNames.htm Commonly Used Welding Processes and their Abbreviation] – Welding Inspection Services website
* [http://www.cwa-acs.org Canadian Welding Association]
* [http://www.twi.co.uk/ The Welding Institute]
* [http://www.key-to-steel.com/Articles/Art75.htm Welding Process] – Key to Steel (Online steel properties database)
{{Metalworking - Welding}}
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[[Category:Arc welding]]