Coroado, J.Ganguly, SupriyoSuder, WojciechWilliams, StewartMartins Meco, SoniaPardal, Goncalo2020-07-092020-07-092020-07-01Coroado JR, Ganguly S, Suder WJ, et al., (2020) Selection of processing parameters in laser microwelding. Part 1: Continuous wave (CW) mode. Lasers in Engineering, Volume 46, Issue 5-6, 2020. pp. 265-2840898-1507https://www.oldcitypublishing.com/wp-content/uploads/2020/06/LIEv46n5-6p265-284Coroado.pdfhttps://dspace.lib.cranfield.ac.uk/handle/1826/15541A phenomenological model which specifies the penetration depth and width of the fusion zone in laser microjoining can be a very useful tool in achieving the required welding parameters for a desired application. In this study the power factor model, previously established and validated in macrowelding, has been tested in fibre laser microwelding, enabling achievement of a particular weld independently of a laser system. Differ-ent weld profiles in aluminium and stainless steel were correlated with various combinations of parameters for a wide range of beam diameters. It has been shown that the same penetration depth can be achieved with different weld profiles. A similar trend, as previously found in macrow-elding, has been confirmed in microwelding. It was demonstrated that the depth of penetration can be kept constant independently of the laser sys-tem until certain limit of beam size.enAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/power factor modelweld shapebeam diameterdepth of penetrationinteraction timelaser microwelding304L stainless steel5251 aluminium alloyFibre laserArticle