Apparently the COPALUM tool I mentioned in the original post does in
fact create a cold weld to the aluminum and copper. Which means the
equivalent tool I'm trying to find would also have to be able to create
enough pressure to do the same ... am I correct in assuming that that
rules out hand operated crimping tools and only leaves powered ones?

Thanks,
Harry

P.S. According to some of the information available on the COPALUM
tool, it creates 10,000 pounds of pressure.