I am looking for a solution to joining Aluminum to Galvanized Steel. Whether it be welding, brazing, explosion cladding, friction stir welding, thermal spraying. Each piece would be 2MM thick and needs to withstand thermal shock from -40 to 120 degree Fahrenheit. If money were no object how would you suggest joining these two metals. I know a major problem with these two metals is the galvanic corrosion that takes place between them but are there any other major issues besides dissimilar melting tempuratures? Any suggestions would be great.