Bundy tube

Bundy tube

Bundy tube, sometimes called Bundy pipe, is type of double-walled low-carbon steel tube manufactured by rolling a copper-coated steel strip through 720 degrees and resistance brazing the overlapped seam in a process called Bundywelding. It may be zinc- or terne- coated for corrosion protection. It is used in automotive hydraulic brake lines in cars manufactured in the USA since the 1930s.

A 1969 study by the SAE recommended the replacement of Bundy tube with 90-10 copper-nickel alloy UNS C70600 (Kunifer pipe) because of corrosion concerns. [A.G. Imgram and D.K. Miner, Paper 690530, Mid-Year Meeting, May 1969] Kunifer pipe has since been adopted by European automakers Volvo, Rolls-Royce, Lotus Cars, Aston-Martin, Porsche, and Audi. [cite web | title = Copper-Nickel Automotive Vehicle Brake Tubing | publisher = Copper Development Association | url = http://www.copper.org/applications/automotive/brake.html | accessmonthday = September 9 | accessyear=2006] Bundy pipe retains the advantage higher rigidity, which means less volume expansion under pressure.

The Bundy Tubing Company, started in the USA, was bought in the 1980s by what is now the British company TI Automotive (see http://www.tiautomotive.com/ and http://www.tiautomotive.de/home.htm).

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