Thin-walled butt welded stress intensification factors and stress indices
- General Dynamics Electric Boat Div., Groton, CT (United States)
The baseline for the butt weld stress intensification factor (SIF or i-factors) of 1.0 for nominal pipe wall thickness equal to or greater than 0.237 inch is largely based on the Markl`s fatigue tests performed during the late forties and early fifties. An attempt to address piping products with nominal wall thicknesses less than 0.237 inch has resulted in the ASME Section 3 Code increasing the SIF to a maximum value of 1.9 in lieu of 1.0 for a girth butt weld. A corresponding increase in the C-stress index for Class 1 girth butt welds has also been incorporated into the ASME Section 3 Code for Class 1 components. Based on an evaluation of data obtained from the fatigue testing of eleven thin-walled Alloy 625 girth butt welds (t = 0.103 inches), it has been shown that an i-factor of 1.0 is adequate for thicknesses less than 0.237.
- OSTI ID:
- 124706
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1332-0
- Country of Publication:
- United States
- Language:
- English
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