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Fatigue strength of a groove weld on steel backing
AbstractGroove welding made from one side is a common fabrication technique for joints in steel structures. If a steel backing bar is used, current (1988) North American specifications require that it be removed after welding and the weld ground flush if the detail is oriented transversely to the direction of stress and loaded in fatigue. This is an expensive, and in some cases impractical, procedure. British specifications permit the detail to be used but assign a very restrictive fatigue category.In the investigation reported herein, data concerning the fatigue strength of a groove weld with steel backing bar have been obtained experimentally. The backing bar was attached with intermittent fillet welds. A finite element analysis was used to assist in interpretation of the test results.The analysis showed that high local stresses are present at the toe of the fillet weld. However, high stresses also exist at the flush-ground face of the groove weld, and in the physical tests all fatigue cracks started at this side of the detail.When this detail is present in a structure that is subjected to a fatigue loading, Category C of the AASHTO or CSA specifications will provide a suitable basis for design. The selection of categories Class F or G from the British Standard (depending upon the proximity of the fillet welds to the edge of the plate) is too conservative.
Fatigue strength of a groove weld on steel backing
AbstractGroove welding made from one side is a common fabrication technique for joints in steel structures. If a steel backing bar is used, current (1988) North American specifications require that it be removed after welding and the weld ground flush if the detail is oriented transversely to the direction of stress and loaded in fatigue. This is an expensive, and in some cases impractical, procedure. British specifications permit the detail to be used but assign a very restrictive fatigue category.In the investigation reported herein, data concerning the fatigue strength of a groove weld with steel backing bar have been obtained experimentally. The backing bar was attached with intermittent fillet welds. A finite element analysis was used to assist in interpretation of the test results.The analysis showed that high local stresses are present at the toe of the fillet weld. However, high stresses also exist at the flush-ground face of the groove weld, and in the physical tests all fatigue cracks started at this side of the detail.When this detail is present in a structure that is subjected to a fatigue loading, Category C of the AASHTO or CSA specifications will provide a suitable basis for design. The selection of categories Class F or G from the British Standard (depending upon the proximity of the fillet welds to the edge of the plate) is too conservative.
Fatigue strength of a groove weld on steel backing
Kulak, G.L. (author) / Baker, K.A. (author)
Journal of Constructional Steel Research ; 12 ; 261-278
1989-01-01
18 pages
Article (Journal)
Electronic Resource
English
Fatigue strength enhancement of steel girders by post-weld treatment
British Library Online Contents | 2003