The IUP Journal of Mechanical Engineering
Understanding the Performance Degradation of Small Stall-Regulated Wind Turbines Due to Typical Manufacturing Defects

Article Details
Pub. Date : Feb, 2020
Product Name : The IUP Journal of Mechanical Engineering
Product Type : Article
Product Code : IJME30220
Author Name : D Bahar, K Vittal Goud, K Sengameshwar, A Naresh4
Availability : YES
Subject/Domain : Engineering
Download Format : PDF Format
No. of Pages : 16

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Abstract

The paper aims at optimizing the percentage elongation, i.e., ductility and Ultimate Tensile Strength (UTS), of weld bead between aluminum alloys Al 6061 and Al 5052 specimens welded by Tungsten Inert Gas (TIG) welding. TIG welding process gives the operator greater control over the weld as compared to other competing processes. 16 experiments are conducted to construct L 16 orthogonal array employed in Taguchi Technique and Gray relational analysis. Four levels of current, gas flow rate, weld speed and root gap are considered in the Design of Experiment (DOE). Analysis of Variance (ANOVA), Signal-to-Noise (S/N) ratio and graphical main effect plots have been used to study the effects of welding parameters on ductility and UTS of weld bead. From the analysis, it is found that welding speed and gas flow rate should be low to enhance the ductility and current should be high to augment the UTS of the weld bead. Confirmatory test is conducted to validate the optimum parameters.


Description

Among the manufacturing processes, welding is primarily used for joining metal parts and is required when larger lengths of standard sections are required or when several pieces are to be joined together to fabricate a desired structure. Welding is the technique of joining metals and plastics by such methods which does not employ fasteners and adhesives. Welding is a process of joining two similar or dissimilar metals by fusion, with or without the application of pressure and a filler metal may be used if required. The fusion of metal takes place by means of heat and is obtained from electric arc, electric resistance, chemical reaction, friction or radiant energy. The result of welding process is a homogeneous material (weld pool) of the composition and characteristics of two parts which are being joined together.


Keywords

Al alloys, Taguchi technique, Gray Relational Analysis (GRA), Design of Experiment (DOE), Signal-to-Noise (S/N) ratio, Ductility, Ultimate Tensile Strength (UTS)

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