Cadwelding

Cadwelding

Cadwelding is joining together two conductors of like or dissimilar materials by exothermic reaction.

The process uses a mixture of several chemicals. A mixture of copper oxides (copper(II) oxide and copper(I) oxide) and aluminium powder provide the main exothermic mixture:

: 3CuO + 2Al = 3Cu + Al2O3 + Heat.

The formula also contains tin metal or its oxide and calcium fluoride. Some formulations also contain calcium silicide and have the aluminium present as an alloy with copper and vanadium ["CADWELD Electrical Welding Material;" MSDS No. LT1273; ERICO: Solon, Ohio, March 1, 2007. [http://www.erico.com/public/library/MSDS/LT1273.pdf] ] ["CADWELD Aluminum Welding Material;" MSDS No. LT1272; ERICO: Solon, Ohio, March 1, 2007. [http://www.erico.com/public/library/MSDS/LT1272.pdf] ] .

The Cadweld process was invented by Clevelander Charles A. Cadwell in 1938, while he was working for the Electric Railway Improvement Company, now called ERICO. The firm still produces a line of Cadweld products out of its headquarters in Solon, Ohio.

See also

* Thermite

References


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