Why do aluminum cylinders made from the 6351-T6 alloy require an eddy current test?

This particular alloy has a history of a phenomenon known as sustained load cracking (SLC) that can cause a cylinder to fail. Aluminum SCUBA cylinders manufactured in 1982 and 1983 require particular attention because the 6351-T6 alloy used during that period had a higher lead content which makes the cylinder more susceptible to SLC. By 1990, the US aluminum cylinder industry was using a different alloy, known as 6061-T6.

There are no indications that the 6061-T6 alloy has problems with SLC, and no steel cylinder has ever shown problems with SLC. Click Here to read an article by Bill High, President of PSI Cylinders, Inc. , for more information about sustained load cracking in aluminum cylinders.

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