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In the process to manufacture for metallic structures, control of welding deformation is one of an importantproblems connected with reliability of the manufactured structures so that welding deformation should be measured and controlled with quickly and actively. Also, welding parameters which have as lot of effects on welding deformation such as arc voltage, welding current and welding speed can also be controlled. Theobjectives for this study were to develop a simple 2-D FEM to calculate not only the transient thermalhistories but also the sizes of fusion and heat-affected zone (HAZ) in multi pass arc welds including the butt and fillet weld type with dissimilar thickness, and to concentrate on a developed model for the finding the parameters of Godak’s moving heat source model based on a GA. The developed model includes a GA program using MATLB and GA toolbox, and a batch mode thermal model using ANSYS software. Not only the thermal model was verified by comparison with Goldak’s work but also the developed model was validated with molten zone section experimental data.Key Words : Weld distortion, Genetic algorithm, Double-ellipse heat input model, Finite element method |
