| |
 |
UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:18 |
 |
|
|
|
Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Solid State Physics and Materials Science
Title:
Laser Material Processing in the Frame of COST Actions MP1401 and TD1205
Authors:
G.D. CHIOIBAȘU (1), D. KLOBČAR (2), D. SPOREA (1), M.JEZERŠEK (2), J.TUŠEK (2), M.KOS (2), M. SAVESCU (1)
Affiliation:
1) National Institute for Laser Plasma and Radiation Physics, 077125 Magurele, Romania
2) University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, 1000 Ljubljana, Slovenia
E-mail
diana_chioibasu@yahoo.com
Keywords:
laser welding, laser cutting, stainless steel, optimal parameters
Abstract:
The Laser macro processing laboratory of INFLPR is active in two COST Actions dedicated to fiber lasers (MP1401) and application of synchrotron radiation to radiotherapy (TD1205). Within the COST Action MP 1401 a Short Term Scientific Mission took place at University of Ljubljana to investigate comparatively the use of two types of lasers, on one side 400 W (300 W) ytterbium fiber laser (in Slovenia) and a 3 kW CW Yb:YAG laser (in Romania). The effect of welding speed (0.5 to 2.9 m/min) and focusing position (-2 to 2 mm) on the front weld width, middle weld width, back width, weld thickness, weld area and tensile strength (Rm) were examined using response surface methodology (RSM). The goal was to set the process factors at optimum values to reach the highest tensile strength. Linear and quadratic equations for predicting the width and tensile strength of the welds were generated. Numerical and graphical optimization techniques were used. In this study, optimal solutions were found that would improve the weld quality, increase the tensile strength and minimize the front and back width, in order to obtain a heat affected zone as small as possible.
In the frame of COST Action TD 1205 laser cutting was used for the production of micro-slits collimators to be applied in Microbeam Radiation Therapy. For this purpose, a continuous solid-state laser, connected by optical fibers to a computer numerical control machine was employed. Several sets of 125 μm slits were made on a rectangular shape of stainless steel 316 L.
Acknowledgement:
This work was performed in the CETAL laser facility, financed by the National Authority for Research and Innovation in the frame of Nucleus programme - contract 4N/2016. The procurement of laser material processing stations was financially supported by UEFISC, grant 8PM/2010.
|
|
|
|