Clearly the ASME codes may not be applicable in your situation, but the degree of thinning is sometimes overlooked by designers and workers that are not familiar with ASME pressure piping codes where such consideration is required.
ASME B31.1 and B31.3 has formulas for calculating the maximum permissible thinning of fabricated bends for pressure piping applications. The extrados (outside radius) of the bend will elongate (stretch) and become thinner, while the intrados (inside radius) will compress and get thicker. Another consideration is wall thinning due to the bending operation. You may be overaging the 6061-T6 and reducing the mechanical properties of the part being manufacturered.
Hello Fellas Don't you just love working with aluminum? While heating the 6061 aluminum will soften it and allowing for easier bending and forming, consider what is happening to the mechanical properties.
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