Comparison of Theoretical Disc and Point Source Profiles with Actual-Melt Source Profile in Conduction Welding
Keywords:
Point source, Defocused laser beam, Depth of penetration, Laser welding, Weld profilesAbstract
Prediction of fusion zone in numerical modelling of welds using a modified heat transfer model requires experimental results for validation. Primarily, the modified heat transfer models are developed from the point and disc source heat models which can be assumed to be a semi-circle or spherical shape. In this study, a simple relationship between melt areas, the depth of penetration and weld width was proposed for point and disc source profiles to represent the actual weld profile. The results obtained for focused and defocused laser beams indicate that the actual weld profile is closer to a point source than the disc source. The transition between the conduction and keyhole regimes was achieved when the actual weld depth of penetration is below that of the point source.
References
Assuncao, E.; S. Williams and D. Yap. (2012). Interaction Time and Beam Diameter Effects on the Conduction Mode Limit. Opt. Lasers Eng., 50(6): 823–828.
Ayoola, W. A.; W. J. Suder and S. W. Williams. (2020). Effect of Beam Shape and Spatial Energy Distribution on Weld Beam Geometry in Conduction Welding. Optics and Laser Techn., 117: 280-287.
Ayoola, W. A.; W. J. Suder and S. W. Williams. (2017). Parameter Controlling Weld Bead Profile in Conduction Laser Welding. Journal of Materials Processing Tech., 249: 522 – 530.
Ayoola, W. A.; W. J. Suder and S. W. Williams. (2021). Identification of welding Regime in Powder Melting, Nigerian Research Journal of Engineering and Environmental Sciences, 6(2): 574 – 586.
Bag, S.; A. Trivedi and A. De. (2009). Development of a Finite Element Based Heat Transfer Model for Conduction Mode Laser Spot Welding Process using an Adaptive Volumetric Heat Source. Int. J. Therm. Sci., 48 (10): 1923–1931.
Chelladurai, A. M.; K. A. Gopal; S. Murugan,; S. Venugopal and T. Jayakumar. (2014). Energy Transfer Modes in Pulsed Laser Seam Welding. Mater. Manuf. Process. 30, 162–168.
Eagar, T. W. and Tsai, N. S. (1983). Temperature Fields Produced by Traveling Distributed Heat Sources. Weld. J., 62 (12): 346–355.
Fuerschbach, P. W. and Eisler, G. R. (2002). Effect of Laser Spot Weld Energy and Duration on Melting and Absorption. Sci. Technol. Weld. Join. 7 (4): 241–246.
Kaplan, F. H. (1999). A Model of Deep Penetration Laser Welding Based on Calculation of the Keyhole Profile. J. Phys. D. Appl. Phys., 27 (9): 1805–1814.
Kruth, J. P.; L. Froyen, J. V. Vaerenbergh, J. Mercelis, P. Rombouts, and B. Lauwers. (2004). Selective Laser Melting of Iron-Based Powder. J. Mater. Process. Technol., 149 (1-3): 616–622.
Rosenthal D. (1941). Mathematical Theory of Heat Distribution during Welding and Cutting. J. Weld., 20: 220–234.
Steen, W. M.; J. Dowden, M. Davis and P. Kapadia. (1988). A Point and Line Source Model of Laser keyhole Welding. J. Phys. D. Appl. Phys., 21: 1255 – 1260.
Suder, W. J. (2012). Study of Fundamental Parameters in Hybride Laser Welding. Ph. D. Thesis, Department of Manufacturing, Cranfield Universty, Bedford, United Kingdom.
Wahab, M. A.; M. J. Painter, and M. H. Davies. (1998). The Prediction of the Temperature Distribution and Weld Pool Geometry in the Gas metal arc Welding Process. J. Mater. Process. Technol., 77 (1-3): 233–239.
Yadaiah, N. and Bag, S. (2014). Development of Egg-Configuration Heat Source Model in Numerical Simulation of Autogenous Fusion Welding Process. Int. J. Therm. Sci., 86: 125–138.
Zhang, B.; L. Dembinski and C. Coddet. (2013). The Study of the Laser Parameters and Environment Variables Effect on Mechanical Properties of High Compact parts Elaborated by Selective Laser melting 316L Powder. Mater. Sci. Eng. A., 584: 21–31.
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