Abstract

In the present study, stress distribution of butt welded joints with various amounts of reinforcement metal and undercut defect has been investigated under uniaxial tension for a full penetration by systematically conducting a series of two-dimensional finite element (FE) models. The FE analysis indicated that the amount of reinforcement metal in weld zone has an important effect on stress distribution. For 120° of the reinforcement angle that designating reinforcement metal in weld joint, and 0.5 mm of toe radius, the value of stress concentration factor (SCF) exceeds 3.3 σ 0. The analyses show that SCF takes much higher values in both low reinforcement angle and ratio of toe radius to plate thickness ( R/ t). As for joints with undercut defects, it is concluded that severity of SCF is mainly controlled by the ratio of depth to radius of undercut ( h/ r) and width ( W). In addition to undercut defect, the presence of reinforcement metal, SCF noticeably increases with decreasing the reinforcement angle; it attains maximum value (7.4 σ 0) for h/ r = 5 and W = 3 mm. However, for the joints having wider undercut defects, the influence of reinforcement metal on SCF is found to be relatively lower; SCF is 6.7 σ 0 for W = 6 mm. Finally, an attempt has been made to construct simple relationships among the SCF of the weld joint, reinforcement angle, undercut defect and dimensionless parameters defining weld toe detail.

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