I'm looking for a resource/specification that notes the minimum tensile strength of 6061-T6 aluminum in the as-welded condition should be that of 6061 in the annealed state, since 6061-T6 is known to drop in tensile strength in the weld and HAZ areas significantly following welding. Multiple tensile tests illustrate that values hover just above and below the minimum for 6061-T6, on very high quality welds that pass X-ray to a AWS D17.1, Class A level. This information is needed to assist in procedure qualifications to both AWS D17.1 and AWS D1.2. Additionally, we have experienced bend test failures on 6061-T6 weldments, right in the transition area between the HAZ and unaffected base metal, I believe due to the sharp change in formability from the weld centerline out caused by the welding heat input/annealing. Can anyone comment on this and how it might be addressed going forward?
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