Brazing Characteristics and Wettability of Laser Powder Bed Fusion Additive Manufactured Grcop-84 Compared to Cucrzr and Ofc, and Brazing to Titanium-Zirconium-Molybdenum Alloy Limiters

Laser Powder Bed Fusion (L-PBF) enabled Additive Manufacture (AM) of high field side lower hybrid current drive launcher components from Glenn Research Copper 84 (GRCop-84), a Cr2Nb (8 at. % Cr, 4 at. % Nb) precipitation hardened alloy with a yield strength of 500 MPa and ultimate tensile strength (UTS) of 740 MPa. Build volume limitations on the Concept Laser M2 prevent monolithic AM of a complete launcher structure, requiring modular segments that are joined together with laser welding. Pulsed fiber laser parameters are developed to weld 0.5-0.7 mm thick GRCop-84 sheets is butt and edge joint configurations. Fixturing plates developed to align and compress the weld joints provided heat sinking, argon shield gas, and prevented distortion