Research on Stress Concentration at the Toe of Butt Welds in Pressure Pipelines
The safety assessment of planar defects in circumferential welds in the standard GB/T 19624-2019 mainly considers the sum of axial membrane stress and bending stress,but does not consider the influence of stress concentration effect on film stress.This paper is based on the struc-tural stress analysis method of ASME VIII weld fatigue.The influence of seam residual height h and seam width b of 14 mm plate thickness on the stress concentration of butt weld was analyzed by ABAQUS.The results show that when the width b is constant,the stress concentration coefficient Km of the weld structure increases with an increase of the residual height h.When the residual height h reaches a certain value,the Km value basically remains constant,and the maximal of the Km value depends on the width b.Consequently,the functional relationship between Km and width b within a specific residual height h and width b is proposed,as Km=0.97+0.021b.The research content has important engineering guiding value for the safety evaluation of pressure pipelines with defects and fatigue analysis of butt weld.
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