Transactions of Nanjing University of Aeronautics & Astronautics
Study on Microstructure and Properties of TIG Welded Joint of TC2 Titanium Alloy and Quality Inspection
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Abstract:
TIG welding experiments of TC2 titanium alloy sheet was carried out， and the well-formed weld was obtained. After welding process， the cross-section microstructure， mechanical properties， fracture morphology and quality inspection of the joint were studied. The results show that the microstructure of the weld consists of a large number of acicular α′ and β block. The microhardness curve shows that the microhardness value in the fusion zone （FZ） of the joint is significantly higher than that in the heat affected zone （HAZ） and the base metal （BM）， and the microhardness of the base metal is the lowest. The tensile strength of the joint is equivalent to that of the base metal， and the fracture morphology shows that the fracture mechanism of the joint is mixed ductile-brittle fracture mode. The weld quality is excellent through chemical inspection， penetrant inspection and X-ray inspection.
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Clc Number:
TG146
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