The Analysis of Influence of Characteristics of Radiation of CO2 and Fiber Lasers on the Form and Depth of the Destroyed Surface of а Metal

2014 ◽  
Vol 9 (1) ◽  
pp. 62-69
Author(s):  
Aleksandr Zaitsev ◽  
Oleg Kovalev ◽  
Elena Smirnova
Keyword(s):  
Stainless Steel ◽  
Comparative Analysis ◽  
Laser Radiation ◽  
Laser Power ◽  
Laser Cutting ◽  
Fiber Lasers ◽  
Steel Sheet ◽  
Wave Length ◽  
Stainless Steel Sheet ◽  
Radiation Wave

On the basis of model ideas of interaction of laser radiation with metals the results of theoretical and research of influence of radiation wave length with circular polarization of a laser beam on a form of a destroyed surface of stainless steel sheet at a variation of laser power and material thickness are presented. The special attention is paid to the comparative analysis of efficiency of destruction of metal at CO2 laser (with λ = 10.6мкм), and fiber laser (with λ = 1.07мкм), which widely now in use in technological complexes on laser cutting of various sheet materials

Optimization of CO2 Laser Cutting of Stainless Steel Sheet for Curved Profile

2018 ◽  
Vol 5 (6) ◽  
pp. 14531-14538 ◽  
Author(s):  
A. Parthiban ◽  
M. Chandrasekaran ◽  
V. Muthuraman ◽  
S. Sathish
Keyword(s):  
Stainless Steel ◽  
Co2 Laser ◽  
Laser Cutting ◽  
Steel Sheet ◽  
Stainless Steel Sheet

Numerical Prediction of Residual Stresses in Laser Bending of Stainless Steel Sheet Metals

2009 ◽  
Vol 410-411 ◽  
pp. 629-640 ◽  
Author(s):  
Constatin Gheorghies ◽  
Dumitru Nicoara ◽  
Viorel Paunoiu ◽  
Fabrizio Quadrini ◽  
Loredana Santo ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Residual Stresses ◽  
Laser Power ◽  
Steel Sheet ◽  
Convex Surface ◽  
Element Model ◽  
Stainless Steel Sheet ◽  
Sheet Metals ◽  
Bending Angle ◽  
Input Variables

Stainless steel sheet metals were laser bent by means of a high power diode laser at different values of power and scan velocity. The laser power ranged from 100 to 300 W (with an increment of 50 W); two scan speeds were used, 4 and 8 mm/s, and the number of passes was 2, 4 or 6. In the experimentation, the values of bending angle, microstructure and residual stresses of the laser bended sheet metals were analyzed with regard to the input variables. In particular, residual stresses were evaluated by means of X-ray analysis in terms of first and second order stress. Measurements were performed on the convex surface of the sample in the laser beam action zone. The bending process was numerically simulated by means of a thermo-mechanical finite element model, implemented to predict the sheet metal bending angle as a function of the laser power and scan velocity. The residual stress distribution was extracted from the numerical simulations and its agreement with the experimental observations was discussed. As a general conclusion, the effect of multiple scans is hardly simulated by thermo-mechanical models which do not take into account the material annealing during forming.

Parametric Study and Optimization of Pulsed Laser Thermal Micro-Forming of Thin Sheets

2019 ◽  
Vol 9 (2) ◽  
pp. 47-61
Author(s):  
Kuntal Maji
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Process Parameters ◽  
Laser Power ◽  
Steel Sheet ◽  
Pulsed Laser ◽  
Stainless Steel Sheet ◽  
Micro Forming ◽  
Spot Diameter ◽  
Pulse On Time

This article presents the investigations on deformation behavior in precision forming of thin sheet metal by laser pulses using finite element analysis. The temperature and deformation fields were estimated and analyzed in pulsed laser micro-forming of AISI 304 stainless steel sheet of rectangular and circular shape considering the effects of different process parameters such as laser power, spot diameter and pulse on time. Response surface models based on finite element simulation results were developed to study the effects of the process parameters on deformations for the rectangular and circular workpieces. The amount of deformation was increased with the increase in laser power and pulse on time, and it was decreased with the increase in spot diameter. The effects of pulse frequency and sample size on deformations were also explained. Experiments were conducted on pulsed laser micro-forming of stainless-steel sheet to validate the finite element results. The results of finite element simulations were in good agreement with the experimental results.

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