Abstract
1. It was found that the impact toughness of welded joints of niobium alloys varies with the welding speed. 2. The impact toughness reaches the highest values at welding speeds of 40–60 m/h and then remains constant. The impact toughness changes least for niobium alloys with solid solution hardening. 3. Separation of the impact toughness into its component parts showed that higher welding speeds are preferable. 4. The optimum conditions for heat treating weld seams in alloys 2 and 4 are 1200 and 1200–1300°C respectively with holding for 1h.
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