The Study of Identification Method for the Welding Defect Source of Low-Alloy High-Strength Steel Based on AE Technology

Abstract:

Three-bending test has been performed on the standard specimen and welding specimen with defect of low-alloy and high-strength steel in order to simulate the failure process of structural parts under loading, and the AE activities (number of hits) and stress-strain curve were measured during the whole loading process. The law of acoustic emission signals at different deformation stages has been investigated and the relation between AE characteristic parameters and the different deformation stages has been established. The typical AE waveforms such as friction noise, plastic deformation, welding microcrack initiation and propagation are obtained, which are analyzed by using spectrum characteristics analytical method. The spectrum characteristic parameters such as average frequency, peak frequency and frequency centroid, energy percentage of frequency spectrum part I and III of the typical AE defect signals are extracted, the distributing range of which are initially set. Study shows these five parameters have a closely relation with the nature of the AE signals, and based on these characteristics parameters different AE sources can be preliminary identified correctly. The study can provide some guidance to the practical application of AE acoustic emission technology in the industrial field.

• Periodical: Key Engineering Materials (Volumes 467-469)
• Pages: 1580-1585
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.467-469.1580
• Online since: February 2011
• Authors: Yan Tao Dou, Xiao Li Xu, Wei Wang, Si Qin Pang
• Keywords: Acoustic Emission (AE), Defect Resource Identification, High Strength Steel (HSS), Low Alloy Steel

References

[1] N. Bailey, Weldability of high strength steels, Welding and Metal Fabrication, 1933(8), 389-393.

[2] Zhang Wenyue ete, Research on hardening factor of welding HAZ, China Welding, 1992，1(l)，l-8.

[3] Bertil Ahlbon, Fast Bridge Svetsen special issue, Swedish Welding Society, 1995, 26-27.

[4] ZHOU Xin, Welding technology of high strength low-alloy steel in construction machinery, Electric Welding Machine, 2010(5), 187~189.

[5] DavisJR. ASM handbook. Non-destructive evaluation and quality control, vol. 17. Materials Park (OH): ASM International; (1994).

[6] Effect of martensite phase volume fraction on acoustic emission signals using wavelet packet analysis during tensile loading of dual phase steels.

DOI: 10.1016/j.matdes.2010.01.019

[7] Lee CS, HuhJH, Li DM , Shin DH. Acoustic emission behavior during tensile tests of low carbon steel welds. ISIJ Int 1999; 39(4): 365-370.

DOI: 10.2355/isijinternational.39.365

[8] Khamedi R, Fallahi A, Zoghi H. The influence of morphology and volume fraction of martensite on AE signals during tensile loading of dual-phase steels. Int J Recent Trend Eng 2009; 1(5): 30-34.

DOI: 10.1016/j.matdes.2010.01.019

[9] WU ZhanWen, SHEN Gong Tian, WANG ShaoMei, Characteristics of Acoustic Emission Testing During the Propagating of External Crack on the Crane Box Beam, 2008, 30(9): 635-639.

[10] Charles Brooks, Ashok Choudhury, Charlie R. BrooksA Failure Analysis of Engineering Materials 2003(1): 227~231 Summary This paper is writed by word 2003. Phone number: [phone] Fax number: [phone] E-mail address: dyt0743@sina. com.