I am in the process of qualifying a procedure for GTAW welding of 90/10 copper nickel to copper (hard drawn, deoxided, alloy 122/mil -t-24107). We are currently using an RN-67 filler, argon-helium (75-25) shielding gas and an amperage range of 190-250 as the basic parameters. Having some problems with porosity and fusion to the copper. Anyone have any experience with this combination of base metals? Thoughts?

Mike Farley

farleyme@northfloridashipyard.com