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Influence of Beam Incidence Angle in Laser Welding of Austenitic Stainless Steel using Finite Element Analysis

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This paper presents the influence of beam incidence angle on austenitic stainless steel sheet subjected to a high density laser beam having Gaussian power density distribution. Bead-on trials are conducted on 3.15 mm thick commercial AISI 304 austenitic stainless steel sheet using a Nd:YAG laser source with a maximum output of 2kW in the continuous wave mode. The effects of beam incident angle on the weld bead geometry are studied using finite element analysis. Experiments are conducted with 600, 1000 and 1400W laser power and 800, 1400 and 2000mm/min welding speed. A three dimensional finite element model is developed for the simulation of non-linear transient thermal analysis of the weld bead geometry for different beam incident angles using the finite element code ANSYS. The result reveals that by increasing the beam incident angle with constant beam power and welding speed, there is a considerable reduction in the depth of penetration-to-width ratio (d/w). Further, it is noticed that the process enters into conduction mode of welding from the keyhole mode of welding as the beam angle is increased beyond 10o. The comparison of the simulation results and the experimental data for weld bead geometry with different beam incident angles show good agreement.

Affiliations: 1: Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli – 620 015, India; 2: Welding Research Institute, Bharat Heavy Electricals Limited, Tiruchirappalli – 620 014, India; 3: Department of Mechanical Engineering, Government College of Technology, Coimbatore – 641 013, India


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