Induction heating is a case hardening process used to improve performance of machine
components by producing a hard martensitic microstructure and high compressive residual stresses
at the surface layer. A reliable numerical model able to predict the hardness profile would shorten
process development. However, the accuracy and the efficiency of the model are restricted by the
coupling complexity between the electromagnetic and thermal fields, and the nonlinear behaviour
of the material properties. The paper analyzes the sensitivity of the material properties values and of
the finite element meshing onto the predictive modeling of the case hardening profiles. The material
used is SAE-4340 low-alloy steel. The simulations are done using a computer-modeling software
(Comsol) and the sensitivity analysis is conducted by using an experimental design method.
Synopsis:A new approach to optimising production process procedures is applied to the multipass welding of a butt joint with a single V groove, for a range of thicknesses. The process used is CO, gas shielded automatic welding with a 1.6 mm diameter cored wire. The chosen optimisation criterion is the minimum of a performance index based on the weld penetration and section.
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