Abstract
In this study, the effect of weld bead shape on the fatigue strength of lap fillet joints using the gas metal arc welding (GMAW) process was investigated. The base material used in the experiment was 590 MPa grade galvanealed steel sheet with 2.3 mm and 2.6 mm thickness. In order to make the four types of weld beads with different shapes by factors such as length, angle, and area, the welding process, wire feeding speed, and joint shape were changed. The stress-number of cycles to failure (S–N) curve and fatigue strength were obtained from the fatigue test for four types of weld bead, and the cause of the fatigue strength difference was clarified through the analysis of the geometrical factors, such as length, angle, and area of the weld bead. In addition, the relationship between weld bead shape and fatigue strength was discussed.
Highlights
Due to factors such as global warming, depletion of resources, and rising oil prices, the development direction of the global automobile industry is set to increase energy efficiency [1]
It has been reported that the effect of the weld bead on the metallurgical discontinuity is difficult to confirm because the stress concentration effect on the weld bead is dominant in the lap-fillet-joint-shaped arc weld [4]
A number of previous studies have been carried out to clarify the relationship between weld bead shape and fatigue strength in lap fillet joint arc welding
Summary
Due to factors such as global warming, depletion of resources, and rising oil prices, the development direction of the global automobile industry is set to increase energy efficiency [1]. It has been reported that the effect of the weld bead on the metallurgical discontinuity is difficult to confirm because the stress concentration effect on the weld bead is dominant in the lap-fillet-joint-shaped arc weld [4]. The previous studies on the arc weld and fatigue characteristics of lap fillet joints show that the improvement of weld toe angle increases the fatigue strength. The shape of weld beads affecting the fatigue strength in the arc welds of lap fillet joints was investigated. For this purpose, four types of welds with different shapes were fabricated. The relationship between the fatigue strength and the bead shape factor of the weld is discussed
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