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This Bulletin represents many years of effort by the experts of the Joint Working Group on Fatigue Design Rules. The main points are: on structural hot spot stress, Consideration of aluminum at the effective notch stress method, improvement techniques and multi-axial loading. WRC supports USA participation in IIW via the American Council for IIW, a collaborative body of WRC, the American Welding Society and the Edison Welding Institute. The Bulletin is published under an agreement between WRC and IIW. Commission XIII: Fatigue Behavior of Welded Components and Structures consists of the following Sub-Commissions and Working Groups: Fatigue Testing and Evaluation of Data for Design; Techniques for Improving the Fatigue Strength of Welded Joints; Hot-Spot Stress Method in Fatigue Analysis of Welded Components; The Influence of Weld Defects in Fatigue-Loaded Structures; Life Extension of Welded Structures by Repair, Retrofitting and Structural Monitoring; Fatigue Design Rules. The International Institute of Welding (IIW) has for sixty years served as a remarkable instrument for professionals from many nations to exchange information, work on common problems and prepare publications with recommendations for best practices associated with welding