Riofrío, Patricio G.Antunes, FernandoFerreira, JoséBatista, António CastanholaCapela, Carlos2026-01-202026-01-202021-09-22Riofrío, P.G.; Antunes, F.; Ferreira, J.; Batista, A.C.; Capela, C. Fatigue Performance of Thin Laser ButtWelds in HSLA Steel. Metals 2021, 11, 1499. https://doi.org/10.3390/met11101499.http://hdl.handle.net/10400.8/15415This work is focused on understanding the significant factors affecting the fatigue strength of laser-welded butt joints in thin high-strength low-alloy (HSLA) steel. The effects of the weld profile, imperfections, hardness, and residual stresses were considered to explain the results found in the S-N curves of four welded series. The results showed acceptable fatigue strength although the welded series presented multiple-imperfections. The analysis of fatigue behavior at low stress levels through the stress-concentrating effect explained the influence of each factor on the S-N curves of the welded series. The fatigue limits of the welded series predicted through the stress-concentrating effect and by the relationship proposed by Murakami showed good agreement with the experimental results.engfatigue strengthlaser butt weldHSLA steelfatigue limit predictionjournal article10.3390/met111014992075-4701