Friction stir welding parameters optimization of heterogeneous tailored welded blank sheets of aluminium alloys 6061 and 5083 using response surface methodology

Today, tailored welded blank sheets have found various applications in automotive, aeronautic and many other industrial fields. One of the most efficient methods for production of tailored welded blank sheets is application of the friction stir welding process. In the present article, the effect of friction stir welding parameters on the microstructure and mechanical properties of heterogeneous tailored welded blank sheets made from aluminium alloys of types 5083-H12 and 6061-T6 with the similar thickness of 1.5 mm is studied. The considered parameters are rotational speed of the tool, linear speed of the tool, pin diameter and shoulder diameter. In order to come by a tailored welded blank sheet with optimal mechanical properties, response surface methodology, which is considered as a strong tool in design of experiments, has been employed to design the experiment matrix, and the corresponding experiments have been conducted under laboratory conditions. Tensile strength of tailored welded blank sheets are determined as the relation in the mathematical model. The optimal condition and objective effects of parameters are determined via this relation. Data variance analysis showed that rotational speed and diameter tool have the most and the least effect on tensile strength, respectively. Rotational and linear speed are more effective than pin and shoulder diameter in input heat, which is produced by friction.

[1]  Sangshik Kim,et al.  Tensile behavior of friction-stri-welded Al 6061-T651 , 2004 .

[2]  Rajiv S. Mishra,et al.  Friction Stir Welding and Processing , 2007 .

[3]  Z. Ma,et al.  Effect of welding parameters on tensile properties and fracture behavior of friction stir welded Al-Mg-Si alloy , 2007 .

[4]  T. DebRoy,et al.  Porosity, underfill and magnesium loss during continuous wave Nd:YAG laser welding of thin plates of aluminum alloys 5182 and 5754 , 1999 .

[5]  Xinqi Yang,et al.  Microstructures and fatigue properties of friction stir lap welds in aluminum alloy AA6061-T6 , 2012 .

[6]  Michael Miles,et al.  Formability and strength of friction-stir-welded aluminum sheets , 2004 .

[7]  E. Koumoulos,et al.  Nanomechanical properties of friction stir welded AA6082-T6 aluminum alloy , 2011 .

[8]  V. Balusamy,et al.  Effects of process parameters on mechanical properties of friction stir welds using design of experiments , 2008 .

[9]  Douglas C. Montgomery,et al.  Modified Desirability Functions for Multiple Response Optimization , 1996 .

[10]  G. Box,et al.  On the Experimental Attainment of Optimum Conditions , 1951 .

[11]  H. Somekawa,et al.  Fatigue of Welded Magnesium Alloy Joints , 2004 .

[12]  Thomas Pardoen,et al.  Microstructure, local and global mechanical properties of friction stir welds in aluminium alloy 6005A-T6 , 2008 .

[13]  A. A. Zadpoor,et al.  Mechanical properties and microstructure of friction stir welded tailor-made blanks , 2008 .

[14]  Margaret J. Robertson,et al.  Design and Analysis of Experiments , 2006, Handbook of statistics.

[15]  Hiroyuki Kokawa,et al.  Parameters controlling microstructure and hardness during friction-stir welding of precipitation-hardenable aluminum alloy 6063 , 2002 .

[16]  Yifu Shen,et al.  A feasibility research on friction stir welding of a new-typed lap–butt joint of dissimilar Al alloys , 2012 .

[17]  Philip J. Withers,et al.  Dissimilar friction stir welds in AA5083-AA6082. Part II: Process parameter effects on microstructure , 2006 .

[18]  V. Balasubramanian,et al.  Comparison of RSM with ANN in predicting tensile strength of friction stir welded AA7039 aluminium alloy joints , 2009 .

[19]  R. H. Wagoner,et al.  Forming of tailor-welded blanks , 1996 .

[20]  Seung-Boo Jung,et al.  Evaluation of the microstructure and mechanical properties of friction stir welded 6005 aluminum alloy , 2003 .

[21]  Philip J. Withers,et al.  Dissimilar friction stir welds in AA5083-AA6082. Part I: Process parameter effects on thermal history and weld properties , 2006 .