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Structural Research Series 366PDF


Title:The Effects Of Weld Geometry On The Fatigue Behavior Of Welded Connrctions
Author(s):Williams, H.E.; Ottsen, Henning; Lawence, F.V.; Munse, W.H.
Subject(s):Welded joints
Abstract:The studies reported herein were concerned with the effects of external geometry on the fatigue behavior of transverse butt welded joints in structural steels. Included were studies of the effects of weld profile, the stress concentrations produced by the weld geometry, and metallurgical aspects of the welds. The weld profile was measured in terms of the radius at the toe of the weld, the flank angle, the width of the weld, and the height of the weld. For the ASTM A 36 and A 441 steels studied, the height of the crown of the weld and the general angle at the toe of the weld appeared to provide the best geometrical correlation with fatigue life -- the shorter lives were obtained from specimens with the highest reinforcement and the largest angle. Thus, the stress concentration produced by the radius at the toe of the weld (determined theoretically and by photoelastic measurement) does not, as had been expected, necessarily define the fatigue behavior of a butt welded joint. The metallurgical studies of the fracture surfaces helped to identify and define the points of fatigue crack initiation in the heat affected zone of the base metal. This aspect of the program demonstrated that the effects of the metallurgical notches and the micro-geometry resulting from the welding process are apparently superimposing on the overall geometrical effects and may have a greater effect on the determination of the sites of crack initiation than such external geometrical parameters as the radius or angle at the toe of the weld.
Issue Date:1970-08
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-366
Genre:Technical Report
Sponsor:Project IHR-64 , Illinois Cooperative Highway Research Program
Date Available in IDEALS:2010-01-08

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