Quote:
Originally Posted by SkullWorks
I assume you meant something like T4 temper in the first statement, which with heat cycling will quickly resume T6 considering that is how you age, or "temper" aluminum...but it will become brittle and while it's hot it will sag as the material becomes more elastic
I believe in the second statement you meant to state that it is .0625 thickness, obviously a muffler made of 5/8 (.635) would weigh far too much to even make sense.
At the ed of the day we all know what the outcome will be, the OP obviously is not open to input or suggestions, I just hope he has sense enough to remove the fiber under tray so that when it melts thru from the EGT's and pressure he doesn't catch the under tray on fire...
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I'll have to double check (other stuff in the rod may affect this) but since it's completely melting and not rapidly cooled, there will be no precipitation hardening in the bead. This would effectively be T0 so no amount of heat cycling will bring it back to T6. For the HAZ around the bead, the T4 bit may be correct.
The precipitation hardening (from 6xxx's silicon) is a rather complicated process to ensure the silicon causes even crystalization.