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Fatigue Performance of Thin Laser Butt Welds in HSLA Steel

Authors: P.G. Riofrio; F. Antunes; J. Ferreira; A.C. Batista; C. Capela

Ref.: Metals 11(10), 1499 (2021)

Abstract: This 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.

DOI: 10.3390/met11101499