Effect of joint-edge quality on mechanical properties of laser welded IN718
: Parchegani, Saeid; Piili, Heidi; Salminen, Antti
: Nadimpalli, Venkata Karthik; Mohanty, Sankhya; Jensen, Dorte Juul; Defer, Marion Caroline; Pan, Zhihao
: Nordic Laser Materials Processing Conference
Publisher: IOP Publishing
: 2025
IOP Conference Series: Materials Science and Engineering
: 20th Nordic Laser Materials Processing Conference
: 012012
: 1332
: 1757-8981
: 1757-899X
DOI: https://doi.org/10.1088/1757-899X/1332/1/012012
: https://doi.org/10.1088/1757-899x/1332/1/012012
: https://research.utu.fi/converis/portal/detail/Publication/505436741
Studies on laser welding of metals have shown that the joint -edge quality such as surface roughness and geometry could influence the weld penetration and efficiency thus impacting its mechanical properties. In this study, laser welding was used to join IN718 sheet plates (3.2 mm in thickness) in a butt-joint configuration. The joint edges were prepared with two different methods of laser cutting and standard milling to investigate the effect ofjoint -edge quality on the mechanical properties of the weld. The laser-cut joints showed a larger fusion zone (FZ) area due to their higher surface roughness. The mechanical properties such as hardness, ultimate tensile strength (UTS), and yield strength were comparable regardless of the joint -edge differences. However, the laser-cut joint showed inferior fatigue strength, assessed at 106 cycles, due to micro cracks (microfissures) in the heat affected zone (HAZ).
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The authors would like to thank Business Finland for funding this study via CaNeLis project as well as VADILA project funded by European Regional Development Fund.
