Specifies rx, the crotch radius of the formed lip on an extruded welding tee. This is also the intersection weld crotch radius for WRC329 calculations. Specifying this value can result in a 50% reduction in the stress intensification at the WRC 329 intersection. If you attempt to reduce the stress riser at a fabricated intersection by guaranteeing that there is a smooth transition radius from the header to the branch pipe, then you may reduce the resulting stress intensification by a factor of 2.0.
For B31J, this property applies to welding tees, extruded tees, and sweepolets. See Type or Intersection Types.
Default Values
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When no value is defined, the software uses zero.
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When no value is defined for an extruded tee with B31J, the software uses 0.05*(outside diameter of the branch pipe)
When welding tee and welded-in contour insert tee (sweepolet) geometries meet the
B31J dimensional requirements of a smooth crotch radius and an increased crotch thickness, flexibility factors and SIFs can be reduced. See Reduction of SIFs and Flexibility Factors in B31J Methods.