Experimental Investigations on Repaired Aisi 304a by Optimized Parameters of Various Welding Techniques Using Nitinol Wire

Abstract

Experimental Investigations of various welding parameters of repaired AISI 304A using Design of Experimentation for optimizing parameter subset of welding by shape memory alloy NiTinol is done using prominent six joinery methods viz: Tungsten Inert Gas, Micro Plasma, Laser, Friction Stir, Induction Brazing and Capacitor Discharge and its smart material effect is studied along with determining repaired properties of Tensile Strength, hardness, pseudo elasticity. NiTinol alloy in wire form is used for experimentation study. However, unlike other shapes of NiTinol like powder, plates, tubes and other forms NiTinol in wire form is used for experimentation as it is favorable for obtaining loading high plateau stress in joineries. The experimental investigation has been made on optimized parameter study based on DOE and its computational and simulation validation to find the most fitting range of parameters subset in these welding processes for NiTinol Wire with and without curing process for most apt method of Friction Stir welding. Comparative analysis graphically and analytically is made on repaired part of AISI 304A plate of various joinery methods using Nitinol as filler material to assess the most apt technique of the repaired strength, yield elongation, hardness and micro grain structure properties, pool gravity, nugget zone contact study to determine micro grain and valence structure of NiTinol properties impact on welded component. The study reveals that welding Nitinol requires utmost calculative parameters control of amperage, voltage, pulse frequency, pulse duty cycle, secondary current, feed distance, axial force, tilt angle of tool, lens source, gravity pool of amalgamation, travel speed which plays prominent role varying from process in determining characteristic weld strength for joint analysis. Optimized with design set up and tooling, selected most appropriate mechanical joining technique for these welding methods after comparing with other alternative techniques, which improved the process of repaire