Restraint Stresses and Strains Due to Slit Weld in Rectangular Plate (Report II) : Effective Restraint Intensities of a Slit in a Thick Finite Plate(Welding Mechanics, Strength & Design)

概要

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In recent years, according to the scaling up of welding structures, the demand for welding of thicker plates increases. In case of the first pass weld of a thick plate, the throat thickness is smaller than the thickness of base plate. In this case, it is hard to presume that the thickness of base plate at the groove is entirely effective. For this reason, two dimensional restraint intensities estimated on the assumption that the plate thickness is entirely effective cannot be used as dynamical measures for cold cracking caused by the first pass weld in the case of a thick plate. In this paper, two types of restraint intensities are analyzed by three dimensional elastic analysis with the aid of the finite element method. From the calculated results, the effect of the small throat thickness and the influence of the shape of groove on the restraint intensity are studied. Moreover, assuming that the first pass weld is laid deviated from the center of the plate thickness, the influence of the eccentricity is also investigated. Based on these results, general formulae to evaluate effective restraint intensities are proposed. Henceforth, it is no more necessary to conduct a three dimensional elastic analysis which requires a huge amount of computing time and expense.
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