レーザ超音波による溶接状態の可視化手法の検討
スポンサーリンク
概要
- 論文の詳細を見る
This paper discusses a research on 2-dimensionl visualization of a spot weld piece using laser-ultrasonic technique. This laser-ultrasonic apparatus can scan a surface on a weld piece, and get ultrasonic longitudinal signals on several hundred measurement points per 10mm order. We analyzed these signals by Frequency Response Characteristic from 10MHz to 100MHz, and showed that the ultrasonic attenuation was related to the gain, and the ultrasonic propagation velocity was related to the phase, for frequency domain spectrum. At result, it was appeared that the gain of nugget parts was less than the gain of parents, and the phase of HAZ was latter than the phase of parents and nuggets. From these results, we made maps on frequency domain spectrum, and could realize to visualize the parent and the nugget, the HAZ on a weld piece. In addition, using Electron Back Scatter Diffraction, it was shown that the gain was effected by the crystal diameters, the phase was effected by the crystal directions.
著者
-
秋濱 一弘
(株)豊田中央研究所 試作開発部
-
木下 雅夫
(株)豊田中央研究所 機械システム研究部
-
日比野 良一
(株)豊田中央研究所 機械システム研究部
-
大澤 正敬
(株)豊田中央研究所 機械システム研究部
-
蝦名 正輝
(株)豊田中央研究所 機械システム研究部
-
門浦 弘明
(株)豊田中央研究所 分析研究部