Fatigue properties of laser and hybrid laser-TIG welds of thermo-mechanically rolled steels

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 772; p. 138780
• Main Authors: Šebestová, Hana, Horník, Petr, Mrňa, Libor, Jambor, Michal, Horník, Vít, Pokorný, Pavel, Hutař, Pavel, Ambrož, Ondřej, Doležal, Pavel
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 20.01.2020; Elsevier BV
• Subjects: Butt welding; Cooling rate; Cyclic loads; Fatigue; Fatigue limit; Fatigue tests; Gas tungsten arc welding; Gas welding; Heat treating; High cycle fatigue; High strength low alloy steels; High-strength steel; HSLA; Hybrid welding; Inert gas welding; Laser beam heating; Laser beam welding; Laser cooling; Laser welding; Laser-TIG; Lasers; Metal fatigue; Metal sheets; Notches; Rare gases; Steel; Surface layers; Surface roughness; Hybrid welding; HSLA; Fatigue; Laser-TIG; Laser welding; High-strength steel

The hybrid laser-tungsten inert gas welding technology was applied to butt weld 3-mm-thick S460MC and S700MC high-strength low-alloy steel sheets. The intent of low-current arc addition was to preheat the material to reduce extremely fast cooling rate accompanying laser welding. High-cycle fatigue t...