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What are the characteristics of titanium alloy fusion welding

The fusion welding method, specification and process selection of titanium alloy depend on the type, use, working conditions and heat treatment characteristics before and after welding. Because the titanium alloy welded joints adopt the state of heat treatment after strengthening, so the main criteria for the selection of welding process and specification is the optimal range of cooling speed during welding. The optimum cooling rate range is determined by the proper proportion of plastic joint and tissue composition to achieve the best after welding.

Because of the high content of stabilizer in titanium alloy, the optimal cooling speed range should be appropriately selected to minimize the specific and physical inhomogeneity of the welding seam and the near seam area during welding. This inhomogeneity refers to the inhomogeneity in the weld metal midgrain when it is cooled; Grain growth near fracture zone, enrichment of alloying elements at grain boundary, subgrain boundary and particle boundary; And other processes that significantly reduce the dispersion of aging products. In addition, to make the mechanical properties of the welded joint as consistent as possible, it is necessary to prevent aging of the base metal in the heat affected zone, which is heated to a strong aging temperature during welding. Usually, these requirements are met with very strict welding specifications.
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