The bulging effect and its relevance in high power laser beam welding
Open Access
- 1 November 2021
- journal article
- Published by IOP Publishing in IOP Conference Series: Materials Science and Engineering
- Vol. 1135 (1)
- https://doi.org/10.1088/1757-899x/1135/1/012003
Abstract
The present work deals with the recently confirmed widening of the weld pool interface, known as a bulging effect, and its relevance in high power laser beam welding. A combined experimental and numerical approach is utilized to study the influence of the bulge on the hot cracking formation and the transport of alloying elements in the molten pool. A technique using a quartz glass, a direct-diode laser illumination, a high-speed camera, and an infrared camera is applied to visualize the weld pool geometry in the longitudinal section. The study examines the relevance of the bulging effect on both, partial and complete penetration, as well as for different sheet thicknesses ranging from 8 mm to 25 mm. The numerical analysis shows that the formation of a bulge region is highly dependent on the penetration depth and occurs more frequently during partial penetration above 6 mm and complete penetration above 8 mm penetration depth, respectively. The location of the bulge correlates strongly with the cracking location. The obtained experimental and numerical results reveal that the bulging effect increases the hot cracking susceptibility and limits the transfer of alloying elements from the top of the weld pool to the weld root.This publication has 24 references indexed in Scilit:
- Formation and influence mechanism of keyhole-induced porosity in deep-penetration laser welding based on 3D transient modelingInternational Journal of Heat and Mass Transfer, 2015
- Numerical investigation of energy input characteristics for high-power fiber laser welding at different positionsThe International Journal of Advanced Manufacturing Technology, 2015
- Analysis of multi-phase interaction and its effects on keyhole dynamics with a multi-physics numerical modelJournal of Physics D: Applied Physics, 2014
- Numerical Analysis of Hot Cracking in Laser-Hybrid Welded TubesAdvances in Materials Science and Engineering, 2013
- Investigation of keyhole plume and molten pool based on a three-dimensional dynamic model with sharp interface formulationJournal of Physics D: Applied Physics, 2013
- Numerical simulation of molten pool dynamics in high power disk laser weldingJournal of the American Academy of Dermatology, 2012
- Welding of thick stainless steel plates up to 50 mm with high brightness lasersJournal of Laser Applications, 2011
- A Convective Heat-Transfer Model for Partial and Full Penetration Keyhole Mode Laser Welding of a Structural SteelMetallurgical and Materials Transactions, 2007
- The role of recoil pressure in energy balance during laser materials processingJournal of Physics D: Applied Physics, 1997
- Mechanism of locally delayed solidification in electron beam weldingWelding International, 1991