Author : Srinivasareddy Vempati, K.Brahma Raju and K.Venkata Subbaiah

Weld joints of Titanium alloys are used widely in fatigue loaded applications. The failures of welded joints are in the appearance of crack propagation due to fatigue load. The Main objective of present work is to identify the fatigue strength, fatigue life of welded joints of Ti alloy (grade 5) .The welded plates are joined in the cruciform shape using Tungsten Inert Gas weld and ERTi-5 as filler material. The specimens are tested on Instron servo hydraulic fatigue testing machine under constant load ratio(R=0) and frequency of 10Hz. Fatigue life of welded joints is influenced by the geometrical parameters like weld size, weld shape, plate thickness, weld penetration and fillet angle. Using RSM and ANOVA optimum values of geometrical parameters and their significance can be determined to obtain better fatigue life and fatigue strength and Simulation is to done to predict the failure of joints for different weld shape.

Keywords: Response surface Methodology, fatigue life, Design Matrix, Anova technique

Article published in International Journal of Current Engineering and Technology, Vol.8, No.6 (Nov/Dec 2018)