Abstract
Fine-grained steels belonging to the HSLA group (High-Strength Low-Alloy steels) of steels are becoming increasingly popular and are used in both statically and dynamically stressed structures. Due to the method of their production, and thus also the method use to obtain the required mechanical properties, it is really necessary to limit the heat input values for these steels during welding. When applying temperature cycles, HSLA steels in highly heated heat-affected zones (HAZ) reveal intensive grain coarsening and also softening behaviour. This subsequently results in changes in both mechanical and brittle-fracture properties, and the fatigue life of welded joints. While grain coarsening and structure softening have a major effect on the change of strength properties and KCV (Charpy V-notch impact toughness) values of statically stressed welded joints, the effect of these changes on the fatigue life of cyclically stressed welded joints has not yet been quantified. The paper is therefore conceived so as to make it possible to assess and determine the percentage impact of individual aspects of the welding process on changes in their fatigue life. To be more specific, the partial effects of angular deformation, changes that occur in the HAZ of weld, and the notch effect due to weld geometry are assessed.
Highlights
HSLA (High-Strength Low-Alloy) steels are currently one of the preferred types of material among structural steels
HSLA steels in highly heated heat-affected zones (HAZ) reveal intensive grain coarsening and softening behaviour. This subsequently results in changes in both mechanical and brittle-fracture properties, and the fatigue life of welded joints
Attention was focused on quantification of the influence of angular deformation, changes occurring in the HAZ, and the notch effect caused by the weld geometry
Summary
HSLA (High-Strength Low-Alloy) steels are currently one of the preferred types of material among structural steels. The effect of the heat input value on the changes in the fatigue life of welded joints of steels with yield strengths lower than 550 MPa was investigated by, e.g., Šebestová et al [18] and Moravec et al [19]. From the above works, it is not possible to determine the influence of partial aspects of the welding process It is, problematic to assess the effect of, for example, a rigid clamping that reduces the angular deformation of given weldment or intensity of changes that occur in the HAZ. Attention was focused on quantification of the influence of angular deformation, changes occurring in the HAZ, and the notch effect caused by the weld geometry Such information should enable designers and technologists to make more relevant decisions with respect to both welded joint design and the subsequent design of WPS (welding procedure specification)
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