It can be welded by tungsten inert gas (TIG)-welding or by electron beam welding in vacuum. As the welds can have large internal stresses we recommend stress-relieving after welding.
Circumferential welds on cylindrical shapes as well as welds between sheets of large thickness variations should be avoided.
Resistance and plasma-welding are best suited for the welding of small parts (like production of electron tubes). In special cases, we recommend diffusion and friction welding.
Riveting is the best method of joining brittle refractory metals. It is a sure and simple method by which different materials can be joined. This advantage can outweigh the disadvantages, eg the need for more material and the inability to produce a tight seal. Tightness can be achieved anyway by flame- or plasma-spraying the joint with molybdenum.
Pure metal brazes (like Niobium, Titanium, Zirconium) are recommended, for brazing temperatures between 1100℃ and 1900℃, whilst alloy brazes ( Niobium, Copper, Pd-based alloys) are used for liquidus temperatures between approx. 1000℃ and 1300℃. If the brazing temperature does not exceed 1100℃, the hardness of TZM achieved by cold-working can be entirely maintained.
Tungsten and molybdenum manufacturer-Zhengzhou Sanhui Co., Ltd has been dealing in refractory metal for almost 25 years. We are one Alibaba 10-year golden supplier. You can trust us.
