Investigation on the Effect of Electron Beam Weld Shape on Fatigue Performances of Thickness Titanium Alloy

摘要

Different weld shapes of 45mm thickness TA15 titanium alloy were obtained by choosing appropriate electron beam welding parameters, and the influence of weld shape on fatigue performance of the joints was investigated by analytic hierarchy process. The results show that four typical weld shapes were formed, according to their geometry characters, which are respectively named as bell shape, funnel shape, nail shape, and wedge shape. Weld shape effect the fatigue life and dispersion of the experiment data of the joint. The sequencing of fatigue performance of the joints with four different shapes by analytic hierarchy mathematical model is bell shape, funnel shape, wedge shape, and nail shape. It is validated by trial results that the analytic hierarchy mathematical model is effective and practical.