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

Abstract

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 calculatingmore » the SIF for these particular fittings.« less

Authors:
 [1];  [2]
  1. M.W. Kellogg Co., Houston, TX (United States)
  2. Rodabaugh (E.C.), Dublin, OH (United States)
Publication Date:
OSTI Identifier:
7149994
Resource Type:
Journal Article
Journal Name:
Welding Research Council Bulletin; (United States)
Additional Journal Information:
Journal Volume: 392; Journal ID: ISSN 0421-2118
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; PIPE FITTINGS; STRESS INTENSITY FACTORS; PIPES; WELDED JOINTS; STEEL-ASTM-A105; STEEL-ASTM-A106; FATIGUE; SERVICE LIFE; ALLOYS; CARBON STEELS; IRON ALLOYS; IRON BASE ALLOYS; JOINTS; LIFETIME; MECHANICAL PROPERTIES; STEELS; 420200* - Engineering- Facilities, Equipment, & Techniques; 360103 - Metals & Alloys- Mechanical Properties

Citation Formats

Woods, G E, and Rodabaugh, E C. Effects of weld metal profile on the fatigue life of integrally reinforced weld-on fittings. United States: N. p., 1994. Web.
Woods, G E, & Rodabaugh, E C. Effects of weld metal profile on the fatigue life of integrally reinforced weld-on fittings. United States.
Woods, G E, and Rodabaugh, E C. 1994. "Effects of weld metal profile on the fatigue life of integrally reinforced weld-on fittings". United States.
@article{osti_7149994,
title = {Effects of weld metal profile on the fatigue life of integrally reinforced weld-on fittings},
author = {Woods, G E and Rodabaugh, E C},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/7149994}, journal = {Welding Research Council Bulletin; (United States)},
issn = {0421-2118},
number = ,
volume = 392,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 1994},
month = {Wed Jun 01 00:00:00 EDT 1994}
}