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| Microstructure and Mechanical Properties of Welded Joint of TC17 Titanium Alloy |
| JIN Junlong, WAN Xiaohui, GUO Delun |
| ( Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Aeronautical Manufacturing Technology Institute, Beijing 100024, China ) |
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Abstract TC17 titanium alloy sheet is welded with tungsten inert gas arc welding (TIG) and electron beam welding
(EBW), and tensile tests are carried out. Based on tensile test result and fracture morphology, relationship between mechanical
properties with microstructure of welded joint is analyzed. The research results show, when TC17 alloy is heated
by TIG arc, grains in the weld bead and heat affected zone (HAZ) are badly coarsening. The heat affected zone of EBW is
relatively narrow, and there is no coarse grain zone. Tensile strength of two welding methods are both strong as the base
metal and the relative elongation is deceased, mainly because of the microstructure change of the heat affected zone and the
weld. Compared with EBW, the micro structure of TIG joint is more coarse.
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2017, 
