Microwave brazing of NiTi shape memory alloy with Ag–Ti and Ag–Cu–Ti alloys

Welding and Joining of NiTi Shape Memory Alloys: A Review

“…2 Ni and Ni ?3 Ti can also precipitate during solidification, having adverse effects on the strength and shape memory characteristics. In order to fulfil specific needs of the medical industry, welding experiments on dissimilar joints like NiTi/stainless steel [19] or Hastealloys [20] were performed and reported. In the aerospace industry new parts like gas turbine nozzles are being tested where NiTi is welded to Ti6Al4V [21], substituting the previously used mechanical joining by fasteners.…”

“…Several works have addressed the influence of Ag-based filler materials on the joint characteristics of NiTi/NiTi brazed joints [99][100][101]. Different fillers and heating methods were tested.…”

“…Eijk et al [100], brazed NiTi with Ag-Ti and Ag-Cu-Ti braze alloys in a microwave. With both of these alloys joining was achieved with a significant difference of the existing phases after the brazing process.…”

“…From the available literature on dissimilar brazed joints, the NiTi/stainless steel combination using Ag-based braze alloys is the most studied [100,[104][105][106]. Li and his co-workers [104,106] analysed the effect of brazing parameters on the microstructure and mechanical properties of NiTi/stainless steels joints brazed by laser using Ag-based (Ag-Cu-Zn-Sn) filler material.…”

“…NiTi was also brazed to Ni-based superalloy (Hastelloy C-276) by microwave using AgTi filler [100]. Excessive porosity was observed which is detrimental for the mechanical properties of the joints.…”