Analytical Study on Fatigue Strength Reduction Factor of Small-Diameter Socket-Welded Pipe Joints

[+] Author and Article Information
M. Higuchi, A. Nakagawa

Production Engineering Department, Ishikawajima-Harima Heavy Industries Co., Ltd., 1 Shin-nakahara, Isogo-ku, Yokohama, 2358501 Japan

K. Iida

The University of Tokyo, Oodomari, Koshigaya-shi, Japan

M. Hayashi

Mechanical Engineering Research Laboratory, Hitachi Ltd., Kandatsu-cho, Tsuchiura-shi, Japan

T. Yamauchi

Kobe Shipyard Machinery Works, Mitsubishi Heavy Industries Ltd., Wadasaki, Hyougo-ku, Kobe, Japan

M. Saito

Nuclear Energy Division, Toshiba Corporation, Shinsugita, Isogo-ku, Yokohama, Japan

M. Sato

Welding Engineering Department, Japan Power Engineering and Inspection Corporation, Akasaka, Minato-ku, Tokyo, Japan

J. Pressure Vessel Technol 120(2), 157-163 (May 01, 1998) (7 pages) doi:10.1115/1.2842234 History: Received September 01, 1997; Revised January 26, 1998; Online February 11, 2008


Four-point bending and rotating bending fatigue tests were conducted on socket-welded joints made of carbon, stainless, and Cr-Mo steels for clarification of the effects of diameter, welding pass sequence and post-weld heat treatment (PWHT) on fatigue strength. The results were evaluated quantitatively. Fatigue strength of socket-welded joints was found to strongly depend on weld pass sequences in fillet welds, this being possibly due to large change in residual stress distribution at roots and toes. The effects of residual stress were thus examined quantitatively by comparison of fatigue strength of PWHT stress-free specimens with that of as-welded specimens. By the modified Goodman’s method, the lowest S-N curve corresponding to maximum tensile residual stress and the highest S-N curve corresponding to maximum compression residual stress were obtained for different steels and diameters. Conventional S-N data of socket-welded joints were situated between these two limiting curves. Based on the lowest curve, fatigue strength reduction factors of socket-welded joints were proposed.

Copyright © 1998 by The American Society of Mechanical Engineers
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