I am hoping that someone can explain to me the strength values for heat affected zone presented in the Aluminum Design Manual Table A3.3 for 6061-T6. The ultimate tensile strength for 6061-T6 is 42ksi for non-HAZ and 24ksi for HAZ. That part makes sense. However, when looking at the yield strength, non-HAZ is 35ksi but the yield strength in the HAZ varies depending on the filler. Yield strength in HAZ is 11ksi if welded with 4043 and 15ksi if welded with 5356 (assuming for the moment t > .375). Why does the filler type affect the strength in the HAZ? The heat input seems to be relatively the same for the two filler types, so I can't figure out why the yield strength of the HAZ would vary due to filler.
Any insight would be very much appreciated.
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