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WRC 199
M00000526
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WRC 199 Fatigue Behavior of Aluminum Alloy 5083 Butt Welds
Bulletin / Circular by Welding Research Council, Inc., 1974
W. W. Sanders Jr., S. M. Gannon
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This report discusses the results of a research program on the fatigue behavior of sound weldments in thick aluminum alloys. The specimens of alloy 5083-0 were provided by three aluminum companies and included plain plates, longitudinally welded plates, and transversely welded plates.Axial fatigue tests were conducted on 54 specimens. The results are shown in S-N diagrams. In addition, a supplemental test program was conducted. This program included the study of residual stresses, weld geometry, and weld quality.Conclusions reached from the study are:1. Orientation of the weld in the direction of stress applications is beneficial to fatigue strength of a joint.2. The angle at the toe of the weld reinforcement is the most critical factor in the determination of the fatigue life of an as-welded transverse joint.
3. The actual maximum stress at the weld toe, determined from the nominal stress and stress concentration factor, appears to give a much better indication of expected fatigue life.
4. The fatigue lives of one inch thick welded plates of 5083-0 are significantly lower than those obtained for thin welded plates.