A multi-criteria optimisation method for laser welding of austenitic steel 904L
Journal Title: Journal of Achievements in Materials and Manufacturing Engineering - Year 2016, Vol 76, Issue 2
Abstract
Purpose: Due to the increasing requirements for improvement of the welded structuresquality, it is necessary to analyze the welding process in the design phase. In this context asystem of criteria for optimization was introduced. This system is based on the integratedcomputational tools which allow specifying the function for the selection of the parametersof the welding process without the expensive experiments.Design/methodology/approach: The analysed independent variables were as follows:type of welding head (monofocal and bifocal), laser beam power (P) and laser beam travel(welding) speed (v). The following results were selected as the criteria of weld qualityassessment: visual assessment of weld and root reinforcement, metallographic assessmentof horizontal microsections, microhardness tests, shape factor determined using Jewdokimowand Lawrence methods, and the stress concentration factor. The weld cross-section shapefactor was also used as a criterion. An objective function specifying the quality of weld wasdetermined as the sum of point grades given for each of the above assessment criteria.Optimum values of the parameters for laser welding of 904L austenitic steel were determinedusing MatLab software while taking into account the values of the objective function,. Afterverifying the experimental results, the following parameters were identified for optimum laserwelding of steel: laser beam power and speed of welding with a monofocal head.Findings: The range of the selected technological parameters, ie. head type, power andspeed of the laser beam allowed to adjust optimal welding parameters based on the visualand destructive experiments, ie .: P = 4.5 kW, v = 1.4 m/min. Due to the lower defectivenessof the welded joints monofocal head was chosen.Research limitations/implications: This article presents the optimization procedure for theparameters of the laser welding of flat elements with a thickness of 5 mm made of steel 904L.Originality/value: This paper presents a procedure for configuring parameters for laserwelding of steel using a multi-criteria optimization method for austenitic steel 904 L laserbeam welding.
Authors and Affiliations
B. Nasiłowska, J. Pszczółkowski, Z. Bogdanowicz, M. Bożek
Keywords
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