| Evaluation of TiAI and 40Cr diffusion bonding quality using ultrasonic reflection spectrum |
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| 作者姓名： | 栾亦琳 刚铁 |
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| 作者单位： | State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin,150001 |
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| 摘 要： |
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| 关 键 词： | 超声波测试 反射光谱 扩散压焊 焊接材料 |
Evaluation of TiAI and 40Cr diffusion bonding quality using ultrasonic reflection spectrum |
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| Luan Yilin and Gang Tie,.Evaluation of TiAI and 40Cr diffusion bonding quality using ultrasonic reflection spectrum[J].China Welding,2007,16(2):72-76. |
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| Authors: | Luan Yilin and Gang Tie |
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| Affiliation: | State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001. |
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| Abstract: | Combined with ultrasonic pulse-echo technique, reflection spectrum analysis was introduced to evaluate TiAl and 40Cr diffusion bonding quality. Frequency dependence of reflection coefficient was used to distinguish perfect bonding from imperfect bonding. It is found that the reflection coefficient from perfect bonding interface does not vary with frequency. When the size of imperfections is much smaller than the wavelength of ultrasound, the reflection coeffwient depends on frequency. When the size of imperfections is the same order of or even larger than the wavelength of ultrasound, the reflection coeffwient does not exhibit frequency dependence. However the amplitude of imperfect interface is higher than the amplitude of perfect bonding interface. A combination of reflection spectrum analysis and ultrasonic pulse-echo technique provides more accurate information about the bonding quality of dissimilar materials. |
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| Keywords: | ultrasonic testing reflection spectrum diffusion bonding dissimilar materials |
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