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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:23 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Optimization of laser butt welding of stainless steel 316 L using response surface methodology
Authors:
Diana CHIOIBASU(1), Damjan KLOBCAR(2), Dan SPOREA(1), Matija JEZERSEK(2), Janez TUSEK(2), Matiaz KOS(2), Irina Alexandra PAUN(1), Andrei POPESCU(1), Catalin Romeo LUCULESCU(1), Mihai SAVESCU(1), Bogdan Stefanita CALIN(1)
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Affiliation:
1 Center for Advanced Laser Technologies (CETAL), National Institute for Laser, Plasma and Radiation Physics, Magurele, Bucharest, RO-077125, Romania
2 University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, 1000 Ljubljana, Slovenia
E-mail
dianachioibasu90@gmail.com
Keywords:
Fiber laser; Stainless steel; Butt welding; Weld strength; Response surface methodology.
Abstract:
Laser butt welding of stainless steel 316L was conducted using a remote laser welding system with maximum 400 W continuous wave (CW) fiber laser. The laser power, welding speed, (0.5 to 2.9 m/min), focus position, (-2 to 2 mm) as well as the front weld width, middle weld width and back weld width, weld thickness, weld area and tensile strength (Rm) were simulated using response surface methodology (RSM). The focus diameter was 54 µm at a nominal working distance of 510 mm from the scanning head. The goal was to set the process factors to optimum values in order to reach the highest tensile strength. Numerical and graphical optimization techniques were used. In this study, optimal solutions were found that would improve the weld quality, increase the strength and minimize the front weld width and back weld width in order to obtain a heat affected zone as small as possible. The developed models for prediction of the laser butt weld strength suggests that both welding speed and vertical focus position are key factors for obtaining reliable joints..
Acknowledgement:
This work was supported by the COST Action MP1401: Advanced fibre laser and coherent source as tools for society, manufacturing and lifescience. It was a collaboration between two Institutions: University of Ljubljana, Slovenia and National Institute for Laser, Plasma and Radiation Physics, Romania
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