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The investigation on the superplastic bugling capability of 1.5?mm mill annealed Ti 6Al 4V buttcover plate by means of manual gas tungsten arc welding (M GTAW) and fusion type plasma arc welding (F PAW) have been evaluated respectively. The result shows that untreated Ti 6Al 4V buttcover plate by M GTAW exhibits no superplasticity, while the same untreated plate by F PAW, shows good superplastic ability because of extremely fine acicular martensite microstructure of weld metal. To the buttcover plate by M GTAW, the microstructure of weld metal changed into streaky α structure which exhibits good superplasticity from the original β structure under the condition of the constant temperature of 940?℃ with the deformation degree of 45%, and changed into the fine equiaxed grain which possesses excellent superplastic ability under the condition of the constant temperature of 800?℃ with the deformation degree of 40%.
The investigation on the superplastic bugling capability of 1.5 mm mill annealed Ti 6Al 4V buttcover plate by means of manual gas tungsten arc welding (M GTAW) and fusion type plasma arc welding (F PAW) have been evaluated respectively. The result shows that untreated Ti 6Al 4V buttcover plate by M GTAW exhibits no superplasticity, while the same untreated plate by F PAW, shows good superplastic ability because of extremely fine acicular martensite microstructure of weld metal. To the buttcover plate by M GTAW, the microstructure of weld metal changed into streaky α structure which exhibits good superplasticity from the original β structure under the condition of the constant temperature of 940 ° C with the deformation degree of 45%, and changed into the fine equiaxed grain which possesses excellent superplastic ability under the condition of the constant temperature of 800 ° C with the deformation degree of 40%.