Optimization of the Processing Parameters of Pulsed TIG Welding for the Enhancement of Mechanical Properties of Welds in AZ31 Magnesium Alloy

مهندسی متالورژی و مواد

Article 4, Volume 24, Issue 1 - Serial Number 7, June 2013   

Document Type: Original Articles

DOI: 10.22067/ma.v24i1.22022

Authors

Ali reza Amir khani^* ; Ali reza Abrahimi; Rasol . Khosroshahi

Abstract

In this research, Taguchi method with the orthogonal array of L9 (34) was used in order to optimize the parameters of pulsed TIG welding for obtaining the optimum mechanical properties (UTS) in AZ31 Magnesium alloy Weldments. For this reason, the main parameters of pulsed TIG welding including the peak current (80-120 A), the base current(20-40 A), the pulse ferequency (1.6-5 Hz), and the welding speed (200-300 mm/min) were investigated in three levels with the same duty cycle. Then, the effect of each parameter on the ultimate tensile strength (UTS) of the alloy was evaluated. In addition, in order to choose a proper set of parameters, the results were examined by varience analysis method (ANOVA). Exprements were conducted to confirm the results. The results were found to have a good agreement with the predicted results. Microstructures of all the welds were studied, and their relations with the mechanical properties were evaluated.

Keywords

Pulsed TIG Welding; Taguchi method; AZ 31 Magnesium Alloy; Mechanical properties