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RESEARCH PAPERS

Effects of Crack Starter Bead Preparation in Drop-Weight Test on Nil-Ductility Transition Temperature

[+] Author and Article Information
M. Higuchi

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

T. Yamauchi

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

Y. Tanaka

Babcock-Hitachi Corp., Takara-cho, Kure, Japan

K. Iida

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

J. Pressure Vessel Technol 121(2), 196-202 (May 01, 1999) (7 pages) doi:10.1115/1.2883686 History: Received October 13, 1997; Revised November 05, 1998; Online February 11, 2008

Abstract

The procedure for making crack starter weld deposit on drop-weight test (DWT) specimens was altered from two passes to one pass in about 1990. The effects of some parameters of crack starter weld process on drop-weight test results were studied. Results of this study indicated that length of overlap of the second pass and height of crack starter beads were most effective on nil-ductility temperature (T NDT ). When overlap length and bead height of two-pass deposit were small enough, T NDT obtained by two-pass deposit became lower than one-pass T NDT , the discrepancy being by as much as 25°C. T NDT values for 24 Japanese steels were determined using two different DWT methods, one-pass deposit and two-pass deposit having small overlap length and bead height. The difference of T NDT depending on DWT method could be seen only for high-toughness low-alloy steel base metals. For other materials (i.e., low-to-medium-toughness low-alloy steel base metals, weld metals, and high-toughness carbon steels), T NDT S by two-pass and one-pass deposits were essentially the same. For lower-toughness steels, T NDT was frequently lower than the temperature of v T cv − 33°C), and thus, the reference nil-ductility temperature RT NDT was determined from Charpy impact test results. These results can be taken as a way of interpreting the past toughness evaluations made for operating plants using the two-pass T NDT .

Copyright © 1999 by The American Society of Mechanical Engineers
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