OPTIMIZING OF FRICTION STIR WELDED DISSIMILAR JOINT OF AZ91 ALLOYS BY CONTROLLING MECHANICAL PROPERTIES
Author(s):
l.Suriyaprakash, N.S.MOHAN , R.SASIKUMAR
Keywords:
Friction Stir Welding and Taguchi L9 concepts
Abstract
Friction Stir Welding (FSW) is a solid-state welding that permits an intensive form of parts and geometries to be welded with great nature of joints. The use of high-quality Magnesium alloys is extending in shipbuilding industry, particularly for the advancement of naval warships, cruise ships, littoral surface craft and merchant ships. FSW advancement has been seemed to have various focal points for the exploitation of Magnesium alloys structures, as it is a minimal effort welding process. The objective is to come across the optimum levels of the process parameters in which it yields maximum tensile strength and better hardness. A three-factor, three-level design is utilized for optimizing the FSW process parameters and a Taguchi L9 orthogonal array experimental set up is used to anticipate the responses. The system parameters considered are Rotational speed, Transverse speed and the Tool tilt angle. The Friction stir welding is processed for butt joining of Magnesium alloys (AZ91) plates with 6 mm thickness. Tensile testing is attempted on dog-bone kind test specimen for Magnesium alloys. Analysis of Variance (ANOVA) has been used to analyze the effect of different parameters regarding the responses. The microstructural attributes of the welded segments, including base metal, heat affected zone (HAZ), Thermo Mechanically Affected Zone (TMAZ) and Stir Zone (SZ) are examined through Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis carried out to quantify the chemical element allocation at the weld interface. The observed optimum condition for Magnesium alloys (AZ91) is 560 rpm, 60 mm/min and 1 degree.
Article Details
Unique Paper ID: 156271

Publication Volume & Issue: Volume 9, Issue 3

Page(s): 159 - 164
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