Infrared brazing Ti–6Al–4V and SP-700 alloys using the Ti–20Zr–20Cu–20Ni braze alloy

Great efforts have been made in brazing high-strength α–β titanium alloys below their beta-phase transformation temperature in order to obtain optimized mechanical properties. The brazing temperature of the cold roll-bonded Ti–20Zr–20Cu–20Ni foil is roughly 70 °C lower than that of Ti–15Cu–15Ni filler metal. Moreover, the detrimental Cu–Ni and Cu–Ni–Zr rich Ti phases can be greatly reduced or eliminated by properly choosing the brazing thermal cycle. This research demonstrates the potential application of Ti–20Zr–20Cu–20Ni foil in brazing titanium alloys.