These pics come from a new aerospace test facility that they are constructing at the University of Notre Dame. The SSF-6 is working great.
I am attempting to make all of these fittings air tight as they are used for pressure measurements. We can¹t have any leaks. I had very little warpage of my base metal and I think this is really going to work out very well.
The University of Notre Dame
Institute for Flow Physics and Control (FLOWPAC)
The Hessert Laboratory for Aerospace Research
Here are the pictures that you requested. The copper pieces are 2" plumbing end caps that had been cut back. We used Muggyweld SSF-6 to solder 18-8 Stainless Steel Socket Head Cap Screws to 23 copper end caps.
On an additional 23 end caps we used Muggyweld SSF-6 to solder both an 18-8 Stainless Steel Socket Head Cap Screw and a 304 Smooth-Bore Seamless Stainless Steel Tube in one operation.
You can see in the last photo that the SSF-6 traveled through the hole in the copper, wetting the SS screw threads.
I selected Muggyweld for this operation because it wets stainless very easily, and its melting point seems to be about 100° F lower than the standard high silver content silver solder.
We have not performed any evaluation of the strength since it is already clear to us that it is sufficient for our needs. We will observe the joints over time to determine any aging effects that could adversely affect our application.
Don Schmadel, PhD
Department of Physics
University of Maryland.