Statistical analysis of tensile strength and elongation of pulse TIG welded titanium alloy joints using Weibull distribution

M Balasubramanian,Chaoqun Wu

doi:10.1080/23311916.2016.1239298

M Balasubramanian, Chaoqun Wu

Open Access

https://doi.org/10.1080/23311916.2016.1239298

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Journal: Cogent Engineering	Publication Date: Oct 3, 2016
Citations: 5	License type: CC BY 4.0

Affiliation: Wuhan University of Technology

Abstract

Abstract In this study, the tensile strength of a pulsed current tungsten inert gas welded Ti-6Al-4 V plate has been statistically analysed by Weibull distribution. Titanium alloy of 1.6 mm thickness was welded with pulsed current tungsten inert gas welding. Testing of mechanical properties was done to understand the influence of pulsing current on the fabricated joint. But the result obtained has to be consistent and repeatable. Hence, this paper investigates a method for predicting the reliability of values obtained for tensile strength and elongation with consistency. The tensile strength results obtained vary between 975 and 1160 MPa and percentage elongation vary between 2.4 and 5.9%. Using Weibull technique in conjunction with the experimental data, we can predict the output more accurately. Using Weibull distribution, the welded joint reliability can be obtained. The probability distribution according to which the joint will fail is estimated with the help of Weibull analysis.

Highlights

Ti-6Al-4 V, titanium alloy most often used to fabricate structures, such as in the applications of defence vehicles and space vehicles (Reddy, Gokhale, & Rao, 1997, 1998)
Weibull distribution has not been used in the study of pulse current titanium alloy welding
Regression analysis is most often used for prediction

Summary

PUBLIC INTEREST STATEMENT

Experiments are conducted by the researchers to understand the effect of various factors on the outcome. Researchers conduct three experiments and average the results obtained to pin down to a single number. Reliability analysis used in this study will help the researchers in understanding the number of trials to be done on the same experimental condition to accept the results obtained. Results obtained from two or three trials do not ascertain the results obtained. This study proves that the result cannot be averaged out and the probability of the results obtained can be understood from this analysis

Introduction

Pulse on time

Findings

Conclusion