Abstract
The JSSC Fatigue Design Recommendations specify fatigue design curves on the basis of a lot of fatigue test data for various types of welded joints. These data were obtained earlier than 20 years ago. In the last 20 years, common welding method has been changed from shielded metal arc welding to gas metal arc welding. The difference may mean that the existing fatigue strength categories cannot be applicable to present welded joints. A new fatigue test database was constructed including data after the last issue. Through the database, we have clarified influences of steel grade, welding materials, plate thickness and post weld treatment on the fatigue strength. Based on these results, the JSSC Recommendations have been revised.
