Welding of niobium
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General information on niobium weldability
Welding with a non-consumable tungsten electrode (TIG method) is the preferred method for niobium with several modifications. The zone of formation of the welded joint must be located under an inert gas
Both on the front and on the reverse side of the welding zone.
Electron-beam welding of niobium is also possible. The chemical, mechanical, non-destructive and corrosive properties of welded joints with niobium sheets of 1 mm thickness that were welded either electronically, in a high vacuum method, or by the TIG method welded in a controlled welding chamber filled with argon gas were investigated. Pressure 1 at. The atmosphere contained a mixture of air, nitrogen, oxygen or hydrogen.
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Comparative analysis of the efficiency of niobium welding by different methods
The content of carbon and oxygen in the weld metal from metallic non-noble niobium did not change during TIG welding, while they were significantly reduced in electron-beam welding. The content of nitrogen in the weld metal in electron-beam welding was increased in comparison with the TIG method.
The thermal action zone and weld metal in niobium samples showed very large grains in the microstructure. The hardness of the weld metal in electron-beam niobium welding was higher for TIG welding in an atmosphere of 99.99% argon than for electron beam welding.
With a high content of air in an argon atmosphere, the weld seam becomes brittle when hardened. Tempering of the welded niobium is subsequently impossible.
When testing the strength of a welded joint by electron beam welding, a gap occurs only over the weld zone, while a rupture in sintered welded niobium compounds obtained by the TIG method takes place in the region of the thermal impact zone, or even over the base metal.
Porosity in the weld zone is absent.
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