OPTIMIZING THE MAGNETIC ARC OSCILLATION PROCESS PARAMETERS TO ATTAIN MAXIMUM TENSILE STRENGTH USING RSM
Keywords:
AZ31B magnesium alloy, magnetic arc oscillation welding, response surface methodology, optimization, tensile strengthAbstract
In this investigation, an attempt has been made to predict the tensile strength of magnetic arc oscillation welded(MAO) AZ31B magnesium alloy joints using RSM incorporating process parameters such as current, welding speed, arc amplitude and oscillation frequency as variables. The experiments were conducted based on a four-factors, five-levels, central composite design matrix. The developed empirical relationship can be effectively used to predict the tensile strength of MAO joints of AZ31B magnesium alloy at 95% confidence level. The results indicated that welding current has the greatest influence on tensile strength, followed by the oscillation frequency amplitude and welding speed. Response surface methodology (RSM) was used to optimize MAO parameters to attain a maximum tensile strength of 248MPa (91 % of base metal strength) in the AZ31B Magnesium alloy joints.
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References
Dobrza´nski L A Ta´nski T and Cızek L (2007), “Journal of Materials Processing Technology”, Vol. 192–193 ,567–574.
Zhang Zhi-min XU Hong-yan and WANG (2008), “Corrosion and mechanical properties of hot-extruded AZ31 magnesium alloys”, transactions of nonferrous metals society of china, Vol. 18 s140-s,144.
Scintilla L D Tricarico L Brandizzi M Satrianoc A A (2010), “Nd:YAG laser weldability and mechanical properties of AZ31 magnesium alloy butt joints”, Journal of Materials Processing Technology, 2206–2214.
Padmanaban G and Balasubramanian V (2007), “Optimization of pulsed current gas tungsten arc welding process parameters to attain maximum tensile strength in AZ31b magnesium alloy”, transactions of nonferrous metals society of china, 21467-476.
Razal Rose A Manisekar K Balasubramanian V and Rajakumar S (2012), “Prediction and optimization of pulsed current tungsten inert gas welding parameters to attain maximum tensile strength in AZ61A magnesium alloy”, Materials and Design, Vol. 37, 334–348.
Balasubramanian T S Balakrishnan M and Balasubramanian V and MuthuManickam M A (2011), “Influence of welding processes on microstructure, tensile and impact properties of Ti-6Al-4V alloy joints”, transactions of nonferrous metals society of china, Vol. 21, 1253-1262.
Kou S Le Y (1986), “Nucleation mechanism and grain refining of weld metal”, Welding Journal, Vol. 65(4), 65–70.
Senthil Kumar T Balasubramanian V and Sanavullah M Y (2007), “Influences of pulsed current tungsten inert gas welding parameters on the tensile properties of AA 6061 aluminum alloy”, Materials and Design, Vol. 28, 2080–92.
Koteswararao S R and Madhusudhanareddy G (2005), “Grain refinement through arc manipulation techniques in Al–Cu alloy GTA welds”, materials science and engineering, Vol.404, 227–234.
Sivaprasad K Ganesh S and sundararaman (2007), “Influence of magnetic arc oscillation and current pulsing on fatigue behavior of alloy 718 TIG weldments”, materials science and engineering, Vol.448, 120–127.
Janaki ram G D and Murugesan R (1999), “Fusion Zone Grain Refinement in Aluminum Alloy Welds through Magnetic Arc Oscillation and Its Effect on Tensile Behavior”, Journal of materials engineering and performance, Vol. 8, 513-520.
Pearce B P and kerrbp H W (1981), “Grain Refinement in Magnetically Stirred GTA Welds of Aluminum Alloys metallurgical transactions”, Vol.480 (12b).
Liu M Zhang z D Song G and Wang L (2006), “Mechanism and microstructure of oxide fluxes for gas tungsten arc welding of magnesium alloy”, Metallurgical and Materials Transactions A, Vol. 38, 649−658.
Afrin N Chen DL Cao X and Jahazi M (2008), “Microstructure and tensile properties of friction stir welded AZ31B magnesium alloy”, Materials Science and Engineering A, Vol.472, 179–86.
Box g E P Hunter W H and Hunter J S (1978), “Statistics for experiments”, New York, John Wiley Publications.
Kumar S kumar P and Shan H S (2007), “Effect of evaporative casting process parameters on the surface roughness of Al-7%Si alloy castings”, Materials Processing and Technology, Vol.182, 615−623.
Montgomery D C (2001), “Design and analysis of experiments”, New York, John Wiley & Sons.
Kou S and Le Y (1986), “Nucleation mechanism and grain refining of weld metal”, Welding Journal, 65−70.
Padmanaban G and Balasubramanian V (2011), “Influences of Pulsed Current Parameters on Mechanical and Metallurgical Properties of Gas Tungsten Arc Welded AZ31B Magnesium Alloys”, Metals and Materials International, Vol. 17(5), 831-839.
Munitz A Cotler C Stern A and Kohn G (2001), “Mechanical properties and microstructure of gas tungsten arc welded magnesium AZ91D plates”, Materials Science and Engineering A302, 68–73.
