Carbon arc welding

Carbon arc welding

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 It was the first arc-welding process ever developed but is not used for many applications today, having been replaced by twin carbon arc welding and other variations.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 3,000°C. At this temperature the separate metals form a bond and become welded together.

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.

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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)


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