Yildirim, Halid CanRemes, HeikkiNussbaumer, Alain2020-07-042020-07-042020-07-042020-09-0110.1016/j.ijfatigue.2020.105687https://infoscience.epfl.ch/handle/20.500.14299/169818WOS:000540657100012In HSS welded structures, HFMI allows fatigue strength improvement factors by inducing compressive residual stresses, cold-worked surface region and modifying the weld toe shape. According to the literature, the factors are proposed based on failures at CAL and also checked with a limited dataset at VAL, the latter being more realistic of service loadings. Therefore, this paper investigates the behaviour of HFMI welds at CAL and VAL for R = -0.43. Studies are also performed at the microstructural level for locating the crack initiation and hardness. Fatigue damage sums are evaluated and discussed with the recommended values in the literature.Engineering, MechanicalMaterials Science, MultidisciplinaryEngineeringMaterials Sciencefatigue strength improvementhigh-frequency mechanical impact treatmenthigh-strength steelservice loadingdesignimprovementcurvess700GIS_publitext::journal::journal article::research article