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Proceedings Paper

Prediction of liquation crack initiation at HAZ of laser weldment based on three-dimensional strain analysis at elevated temperature
Author(s): Motomichi Yamamoto; Kenji Shinozaki; Mitsuru Kitamura; Makoto Shirai
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Paper Abstract

The purpose of this study is to develop thermal and dynamic three dimensional strain analysis method for the laser weldment in order to obtain the plastic strain at elevated temperature in HAZ of the laser weldment, and to develop the prediction method of liquation crack initiation in HAZ of laser weldment. The U-type hot cracking test was performed as an experimental evaluation method for liquation cracking susceptibility of laser weldments of Inconel 718. At the same time, thermal and dynamic three dimensional elastplastic strain analyses were performed by FEM for U-type hot cracking test specimens. Heat transfer analysis and elastplastic strain analysis for laser weldments were confirmed by experiments. From this analysis, it becomes clear that the plastic strain at elevated temperature affects liquation crack initiation in HAZ, and the critical strain at elevated temperature, which controlled liquation crack initiation, can be calculated precisely by using this proposed analysis method.

Paper Details

Date Published: 3 March 2003
PDF: 6 pages
Proc. SPIE 4831, First International Symposium on High-Power Laser Macroprocessing, (3 March 2003); doi: 10.1117/12.497897
Show Author Affiliations
Motomichi Yamamoto, Hiroshima Univ. (Japan)
Kenji Shinozaki, Hiroshima Univ. (Japan)
Mitsuru Kitamura, Hiroshima Univ. (Japan)
Makoto Shirai, National Space Development Agency of Japan (Japan)

Published in SPIE Proceedings Vol. 4831:
First International Symposium on High-Power Laser Macroprocessing
Isamu Miyamoto; Kojiro F. Kobayashi; Koji Sugioka; Reinhart Poprawe; Henry Helvajian, Editor(s)

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