Laser-Arc hybrid welding perspective ultra-high strength steels: influence of the chemical composition of weld metal on microstructure and mechanical properties

Abstract The publication is devoted to the researches of laser-arc hybrid welding ultra-high strength steels Hardox Extreme, Weldox 1100E, Armox 600T. The influence of chemical composition of the weld metal on microstructure and mechanical properties of a welding joint has been researched. The influence of welding mode parameters on welded joint geometry and thermal cycle has been simulated with LaserCAD simulation software. Laser-arc hybrid welding is carried out with filler wire of different chemical composition. High quality welded joints with good formation and tensile strength up to 1780 MPa has been received. Martensite phase, carbides, upper bainite and bainite with granular morphology have been detected in the weld metal.