Determination of residual stresses in fiber laser welded stainless steel joints by neutron diffraction method

Darina Kaisheva; Gizo Bokuchava; Igor Papushkin; Gancho Genchev; Nikolay Doynov; Ralf Ossenbrink; Vesselin Michailov; Peter Petrov

doi:10.1117/12.2516421

29 January 2019 Determination of residual stresses in fiber laser welded stainless steel joints by neutron diffraction method

Darina Kaisheva, Gizo Bokuchava, Igor Papushkin, Gancho Genchev, Nikolay Doynov, Ralf Ossenbrink, Vesselin Michailov, Peter Petrov

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Proceedings Volume 11047, 20th International Conference and School on Quantum Electronics: Laser Physics and Applications; 110470H (2019) https://doi.org/10.1117/12.2516421
Event: International Conference and School on Quantum Electronics "Laser Physics and Applications": ICSQE 2018, 2018, Nessebar, Bulgaria

Abstract

This study presents an experimental results of residual stress states in stainless steel plate samples with size 100 x 50 x 10 mm welded using a high-power fiber laser. The technological parameters of the welding process were: laser power Q = 15 kW; laser spot size = 0.65 mm; welding speed V = 3 m/min; 4 m/min; 5 m/min, using 30 L/min of protective Ar gas. The neutron diffraction method was used to determine the residual stresses in the bulk of the material. The neutron experiments were performed on the FSD diffractometer at the IBR-2 pulsed reactor in the Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research - Dubna, Russian Federation. The measured residual stress distributions exhibit maxima at weld seam centers. As expected, for all specimens the residual stress is falling down in regions distant from the weld zone. Maximal residual stress value of 492 MPa was observed for sample welded with speed of V = 5 m/min.

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Darina Kaisheva, Gizo Bokuchava, Igor Papushkin, Gancho Genchev, Nikolay Doynov, Ralf Ossenbrink, Vesselin Michailov, and Peter Petrov "Determination of residual stresses in fiber laser welded stainless steel joints by neutron diffraction method ", Proc. SPIE 11047, 20th International Conference and School on Quantum Electronics: Laser Physics and Applications, 110470H (29 January 2019); https://doi.org/10.1117/12.2516421

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KEYWORDS

Diffraction

Laser welding

Metals

Fiber lasers

Laser processing

Laser applications

Sensors

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