Optimizing pulsed current gas tungsten arc welding parameters of AA6061 aluminium alloy using Hooke and Jeeves algorithm

• Published in: Transactions of Nonferrous Metals Society of China 2008-10, Vol.18 (5), p.1028-1036
• Main Authors: BABU, S., KUMAR, T. SENTHIL, BALASUBRAMANIAN, V.
• Format: Article
• Language: English
• Subjects: aluminium alloy; analysis of variance; gas tungsten arc welding; grain size; Hooke and Jeeves pattern search method; pulsed current; response surface graph; 脉冲电流; 钨电极惰性气体保护焊; 铝合金; 颗粒尺寸
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(08)60176-4

Though the preferred welding process to weld aluminium alloy is frequently constant current gas tungsten arc welding （CCGTAW）, it resulted in grain coarsening at the fusion zone and heat affected zone（HAZ）. Hence, pulsed current gas tungsten arc welding（PCGTAW） was performed, to yield finer fusion zone grains, which leads to higher strength of AA6061 （Al-Mg-Si） aluminium alloy joints. In order to determine the most influential control factors which will yield minimum fusion zone grain size and maximum tensile strength of the joints, the traditional Hooke and Jeeves pattern search method was used. The experiments were carried out based on central composite design with 31 runs and an algorithm was developed to optimize the fusion zone grain size and the tensile strength of pulsed current gas tungsten arc welded AA6061 aluminium alloy joints. The results indicate that the peak current （Ip） and base current （IB） are the most significant parameters, to decide the fusion zone grain size and the tensile strength of the AA6061 aluminum alloy joints.