  Titanium and niobium are the main materials used for the fabrication of
Superconducting Radio Frequency (SRF) cavities. These two metals are usually
joined , using various welding techniques, using a third material in between.
This contribution focuses on the development of an innovative electron beam
welding technique capable of producing a strong bond between these two
different materials. Several samples are produced and tested to assess the
mechanical strength at room and cryogenic temperature as well as the
composition of the resulting welded joint. Also, the first units of the Single
Spoke Resonator type 2 (SSR2) cavities for the Proton Improvement Plan-II
(PIP-II [1]) have been fabricated joining directly various grades of titanium
to niobium and results gathered through the fabrication will be reported.

Accelerator Physics;Applied Physics