It's not so much that the rod is not strong enough,it probably is,but that your far into the temps in which MOST aluminums anneal,gets dead soft,as in,bends with your hands.Most aluminum will start to anneal at about 375*,some as high as 800*.With enough dwell time,you can anneal 6061 T-6 back to dead soft at about 400*.The higher the temps,the less dwell time needed.