(1) the melting point of niobium is 2479℃, and that of titanium is 1677℃, so high temperature heat source is applied for welding.
(2) the physical and chemical properties of niobium and titanium are similar, which is conducive to welding.
(3) for the welding of niobium and titanium, the thermal conductivity of niobium is higher than that of titanium, so the arc must be inclined to one side of the base metal of niobium to make the base metal evenly heated.
(4) during the welding of niobium and titanium, in order to ensure the welding quality of the product, the front and back of the weld should be closely protected by high purity inert gas.
(5) the weldability of niobium and titanium depends on the content of impurities, such as oxygen, nitrogen, hydrogen and other intrusions, which will make the weld grain coarsening and significantly reduce the mechanical properties.
(6) during the welding of niobium and titanium, due to certain differences in the thermophysical properties of the two base materials, if the welding process is not appropriate, the welding deformation will be great, and even crack will occur.
Suitable methods for welding niobium and titanium include vacuum electron beam welding, vacuum diffusion welding, inert gas shielded welding, laser welding, plasma arc welding, etc.
