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Hybrid laser-MIG welding of steels for the energy industry
Mrňa, Libor ; Šebestová, Hana ; Horník, Petr ; Novotný, Jan
Laser-MIG welding can lead to the heterogeneity in the weld metal. A weld root's chemical composition corresponds to the base metal, while the face is formed dominantly by the filler wire that can have a different chemical composition. The study reports on the hybrid technology of laser-MIG welding utilized for joining creep-resistant martensitic stainless steel used in the production of steam turbine components. The hybrid welding system capable of modifying laser spot diameter was developed and the welds with chemically homogeneous weld metal were achieved.

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