Thanks to both of you for your replies. Yes stainlesses are somewhat uneven with CuAl. 316L seems to have no problem, but I've tried 17-4 in the past and had problems with what looked to be hot short cracking in the 17-4. I suppose the safest way to proceed is to put down a layer of 316L, which I know has no problems with the Nitronic and then start the CuAl. Anyway, thanks again, seems I dodged the bullet this time, engineering decided to sleeve the parts instead of cladding them.