Optimization of weld bead geometry in plasma transferred arc hardfaced austenitic stainless steel plates using genetic algorithm

Plasma transferred arc hardfacing has attracted increasing attention for its effective protection against corrosion, thermal shock, and abrasion. The quality of hardfaced components depends on the weld bead geometry and dilution, which have to be properly controlled and optimized to ensure better economy and desirable mechanical characteristics of the weld. These objectives can be fulfilled by developing mathematical equations to predict the dimensions of the weld bead. This paper highlights the development of such mathematical equations using multiple regression analysis, correlating various process parameters to weld bead geometry in PTA hardfacing of Colmonoy 5, a nickel-based alloy over stainless steel 316 L plates. The experiments were conducted based on a five factor, five level central composite rotatable design matrix. A genetic algorithm (GA) was developed to optimize the process parameters for achieving the desired bead geometry variables.

[1]  M. Deaton,et al.  Response Surfaces: Designs and Analyses , 1989 .

[2]  N. Murugan,et al.  Prediction and comparison of the area of the heat-affected zone for the bead-on-plate and bead-on-joint in submerged arc welding of pipes , 1999 .

[3]  Y. S. Tarng,et al.  Process parameter selection for optimizing the weld pool geometry in the tungsten inert gas welding of stainless steel , 2002 .

[4]  Theodore T. Allen,et al.  Statistical process design for robotic GMA welding of sheet metal , 2002 .

[5]  William G. Cochran,et al.  Experimental Designs, 2nd Edition , 1950 .

[6]  V. Gunaraj,et al.  Application of response surface methodology for predicting weld bead quality in submerged arc welding of pipes , 1999 .

[7]  David E. Goldberg,et al.  Genetic Algorithms in Search Optimization and Machine Learning , 1988 .

[8]  A. Nath,et al.  Laser Cladding of Austenitic Stainless Steel with Hardfacing Alloy Nickel Base , 2003 .

[9]  K. Marimuthu,et al.  Prediction and Optimisation of Weld Bead Geometry of Plasma Transferred Arc Hardfaced Valve Seat Rings , 2003 .

[10]  L. Lim,et al.  Microstructures of laser-clad nickel-based hardfacing alloys , 1998 .

[11]  S. Rhee,et al.  Determination of optimal welding conditions with a controlled random search procedure , 2005 .

[12]  A. K. Bhaduri,et al.  A novel procedure for fabrication of wear-resistant bushes for high-temperature application , 2003 .

[13]  L. Lim,et al.  Laser cladding of nickel-based hardfacing alloys , 1998 .