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Study on laser welding of AISI 316L austenitic stainless steel

O. DONTU1, J. L. OCAÑA MORENO2, R. CIOBANU1, M. BRANZEI3,* , D. BESNEA1

Affiliation

  1. University "Politehnica" of Bucharest, Department of Mechatronics and Precision Mechanics, 313 Splaiul Independentei, Sector 6, 060042 Bucharest,Romania
  2. Centro Laser- UPM, Edificio Tecnológico "La Arboleda", Madrid, Postal Code: 028031, Spain;
  3. University "Politehnica" of Bucharest, Metallic Material Science, Physical Metallurgy Department, 313 Splaiul Independentei, Sector 6, 060042 Bucharest,Romania

Abstract

In this paper is presented a complex analysis for laser welding of AISI 316L austenitic stainless steel in case of three different laser sources: Nd:YAG - λ=1060nm, Laser Diode - λ=904 nm and CO2 laser - λ=10.6 m. The laser power input has a specific nonlinear influence on the absorptivity of material for each laser radiation wavelength. In case of CO2 laser unit, for the welding parameters selected (laser spot diameter-3mm, speed-10mm/s), by increasing the power from 2kW to 2.5kW, the weld bead geometry undergoes minimal changes, meaning energy losses. In contrast, in case of Laser Diode unit, the weld bead geometry undergoes significant changes for the same input parameters. Increasing the initial temperature of the base material around 140°C leads to a partial disappearance of the plastic deformation tensions in the material (shear bends), without affecting the structure (grain size and roundness)..

Keywords

Laser welding, Hardness, Bead profile, AISI 316L austenitic stainless steel.

Submitted at: Aug. 18, 2015
Accepted at: Sept. 9, 2015

Citation

O. DONTU, J. L. OCAÑA MORENO, R. CIOBANU, M. BRANZEI, D. BESNEA, Study on laser welding of AISI 316L austenitic stainless steel, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 9-10, pp. 1444-1449 (2015)