Abstract
The role of the welding seam is to achieve the non-removable joint between two or more parts. In principle, three geometric profiles of the welding seams can be obtained: straight profile; concave profile and convex profile. In practice, this geometric shape of the weld seam profile is very important, both in terms of the resistance of the joint to static stresses and in terms of its fatigue life. There are many factors that can influence the geometric shape of the weld seam: the welding process; welding regime; the nature of the filler materials used, the rehabilitation techniques applied and others. Often, this geometric shape of the weld bead is neglected, which is particularly dangerous due to the fact that an improper geometric shape can generate low mechanical strength in static loads or poor fatigue strength in variable loads. An optimum of the geometric configuration of the welding must be found, which reconciles both situations: the mechanical resistance in case of static stresses and also the fatigue resistance in case of variable loads. In this paper, an analysis will be made with finite elements for the straight and convex profile of the welding seams in the case of fillet welds subjected to fatigue. Several elements will be considered such as: damage; total deformation; fatigue sensitivity versus loading history; equivalent von Misses stress; safety factor.
Highlights
IntroductionBoth for fatigue and for static stresses. In the case of welded constructions in which there are fillet welded joints, stress concentrators make their presence felt in various ways
Welded constructions are loaded, both for fatigue and for static stresses
They were analyzed from the point of view of the fatigue stress and tensile - compression stress cycle of ± 5 kN, two cruciform fillet welded joints, with the weld seam thickness of 5 mm, one having straight shape and the other convex shape weld seams
Summary
Both for fatigue and for static stresses. In the case of welded constructions in which there are fillet welded joints, stress concentrators make their presence felt in various ways. It is known that in the case of fillet welded joints loaded with variable loads, sometimes a great effort is made to reduce the stress concentrators. In this sense, several reconditioning technologies are known, such as the "Grinding weld toe" and the "WIG remelting weld toe" technology [1],[2],[3],[4],[5]. The application of these techniques has no influence on the failures of the statically loaded fillet welded joints In this sense, it is necessary to investigate the influence of stress concentrators on variable loaded, for the fillet welded joints that have the seam thicknesses below 5 mm
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