超声冲击对TA15 钛合金焊接接头的影响

研究了TA15钛合金氩弧焊焊接接头超声冲击前后的组织及力学性能,并对接头拉伸断口进行了观察。结果表明,焊接后焊缝区和热影响区的组织与母材的组织差别很大,表现为魏氏组织特征;超声冲击前后母材和接头的组织均变化不大。冲击处理使焊缝区和母材区的强度和伸长率均有所增加。冲击前后的焊缝及母材的室温拉伸断口均属于韧窝型断口。冲击后接头的表面和断面显微硬度均得到了提高。

Effects of Ultrasonic Impact on Welding Joint of TA15 Titanium Alloy

The microstructure,mechanical properties and hardness of TIG welded joints made by TA15 titanium
alloy with and without ultrasonic impact were analyzed and tensile fracture surfaces of the joint were observed. Meantime,the fracture of welding joint was investigated. The results show that,after welding,microstructure of the weld zone and the heat affected zone are different from the parent metal,showing characteristics of weave structure. Microstructure of the parent metal and the joint changed a littie after ultrasonic impact. The tensile strength and the elongation percentage of the parent metal and the weld zone increased slightly. Before and after ultrasonic impact,the property of the tensile fracture surfaces of the parent metal and the weld zone are dimple type fracture. After ultrasonic impact,
the surface microhardness and the section microhardness are obviously increased.