Technical details and how to build an ultrasonic soldering iron. This technique can bond difficult-to-solder metals such as titanium as well as glass and ceramics.

Cerasolzer technical info: http://cerasolzer.com/cerasolzer/basi...

S-bond technical info: https://www.s-bond.com/solutions-and-...

Overview of active soldering process: https://sci-hub.tw/10.5772/intechopen...

Another good overview: https://www.intechopen.com/books/rece...

Discussion of Sn - La solders: https://www.hindawi.com/journals/amse...

Sn - Ti phase diagram: https://sci-hub.tw/https://doi.org/10...

This patent has the key list of ingredients (not just broad ranges) listed at paragraph 45: https://patents.google.com/patent/US2...

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