Aardvark wrote in message .. .
Orval Fairbairn wrote:


I would think that the seam would lose a lot of its basic heat treat
strength, due to the melting/recrystallization.

A PDF on stir/friction welding from NASA.gov
http://makeashorterlink.com/?E472217A6


ww


That's the process. The metal, as they say, does not actually melt,
just plasticizes, and doesn't lose its strength.


Dan