Effects of weld metal profile on the fatigue life of integrally reinforced weld-on fittings

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Welding Research Council Bulletin; (United States)

OSTI ID:7149994

Woods, G E ^[1]; Rodabaugh, E C ^[2]

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1. M.W. Kellogg Co., Houston, TX (United States)
2. Rodabaugh (E.C.), Dublin, OH (United States)

The cyclic fatigue life of fabricated tee intersections, including integrally reinforced weld-on fittings, has been a topic of discussion in the recent past. The discussion has centered around questions concerning the accuracy of the ASME B31.3 Code equations in calculating the stress intensification factors, (SIFs), for these types of intersection geometries. The SIF of an intersection is an indicator of the fatigue life of the intersection when it is subjected to bending moments caused by thermal, flow, or mechanically induced cyclical displacements. Schneider, Rodabaugh, and Woods concur that inaccuracies in the Code SIF equations do exist and that these equations should be revised. This report presents new Markl type SIF data on the B.W.Pipet (BWP), an integrally reinforced weld-on branch fitting, manufactured by WFI International, Inc., in Houston, Texas. The scope of this research project was to determine the influence of the installation weld metal profile of the Pipet to the run pipe on the SIF. The SIF data were then compared to calculated SIF values using equations from the American Society of Mechanical engineers (ASME) B31.1, ASME B31.3, and ASME Section 3, Subsection NC, for the purpose of determining which Code equation may be the most appropriate for calculating the SIF for these particular fittings.

• OSTI ID: 7149994
• Journal Information: Welding Research Council Bulletin; (United States), Journal Name: Welding Research Council Bulletin; (United States) Vol. 392; ISSN 0421-2118; ISSN WRCBB3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
ALLOYS
CARBON STEELS
FATIGUE
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
LIFETIME
MECHANICAL PROPERTIES
PIPE FITTINGS
PIPES
SERVICE LIFE
STEEL-ASTM-A105
STEEL-ASTM-A106
STEELS
STRESS INTENSITY FACTORS
WELDED JOINTS