caa a22 4500 606173218 CHVBK 20210128100732.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10921-015-0281-0 doi (NATIONALLICENCE)springer-10.1007/s10921-015-0281-0 Ultrasonic Time-of-Flight Diffraction Testing with Linear Frequency Modulated Excitation for Austenitic Stainless Steel Welds [Elektronische Daten] [Sen Cong, Tie Gang, Jia-ying Zhang] The main problems for ultrasonic inspection of austenitic stainless steel welds are low signal to noise ratio (SNR) and detection accuracy, caused by anisotropic and heterogeneous material structure with bulky columnar crystal. In order to overcome the problems mentioned above, a linear frequency modulated (LFM) pulse with a large time-bandwidth product can be used as the exciting signal in the ultrasonic inspection of the austenitic stainless steel welds, which can both enhance the average transmitted power and increase the SNR and time resolution by pulse compression process. Therefore, the ultrasonic time-of-flight diffraction (TOFD) technique with the LFM excitation was carried out to realize an accurate sizing and locating detection in austenitic stainless steel welds. Compared with the conventional TOFD testing, the SNR can be increased 12-15dB, and the measured accuracy is also enhanced obviously. Accordingly the measured depth error is less than 0.81% and the length error is less than 2.5%. The proposed method can both enhance the capabilities of the ultrasonic inspection of austenitic welds and the measurement accuracy of ultrasonic TOFD testing. Springer Science+Business Media New York, 2015 LFM excitation nationallicence Ultrasonic testing nationallicence Austenitic stainless steel nationallicence Pulse compression nationallicence Cong Sen State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001, Harbin, China aut Gang Tie State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001, Harbin, China aut Zhang Jia-ying State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001, Harbin, China aut Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/2(2015-06-01), 1-11 0195-9298 34:2<1 2015 34 10921 https://doi.org/10.1007/s10921-015-0281-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10921-015-0281-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cong Sen State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Gang Tie State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 700 1- Zhang Jia-ying State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001, Harbin, China aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/2(2015-06-01), 1-11 0195-9298 34:2<1 2015 34 10921