Abstract
The load bearing capacity of pipeline weld joints with varying wall thicknesses and strength mismatch was assessed using finite element analyses. The structural integrity of API X65-API X80, API X42-API X65, and API X42-API X80 weld joints was investigated under tensile, internal pressure and bending load.Pipe joint combinations with an outer diameter of 762 mm (30 inches) had wall thickness ratios of 1.22, 1.54, and 1.89. The pipe joint's end face with different wall thicknesses was machined with a taper angle of 4°∼45° along the longitudinal direction of the low strength and thick pipe.According to parametric studies, the tensile strength and moment of a pipe joint with a wall thickness ratio less than 1.5 were unaffected by the wall thickness ratio and taper angle; however, those of a pipe joint with a wall thickness ratio greater than 1.5 were significantly reduced at low taper angles. The wall thickness ratio and taper angle had no effect on the failure pressure of the pipe joint with different wall thicknesses.
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