Abstract
1. Saturation of niobium alloys with nitrogen and oxygen during welding leads to the appearance of clearly defined peaks on the temperature dependence curves for ultimate strength. 2. As a result of arc welding in a protective controlled helium atmosphere dosed with oxygen and nitrogen (from 0.001 to 1 vol.% of each), saturation of weld metal with impurities, which is possible with a prescribed partial pressure of these gases beneath the liquid metal, is not obtained. 3. For the test metals threshold values are typical for protective gas atmosphere components, which when exceeded cause marked inhomogeneity for interstitial impurity distribution and the mechanical properties through the cross section of welded joints. 4. The impurity content of weld metal is governed both by the protective gas atmosphere composition, and by the metal chemical composition.
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