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Feasibility study of acoustic emission monitoring of hot cracking in GTAW weld

机译：GTAW焊缝热裂纹声发射监测的可行性研究

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摘要

Acoustic emission testing can be used to detect the energy emitted from material fracture and the advantage of this method is the real time monitoring, however the weld metal discontinuities are normally inspected by using conventional NDT methods such as Penetrant Testing (PT), Magnetic particle Testing (MT), Ultrasonic Testing (UT) and Radiographic Testing (RT) after the completion of welding. The weld defect must be repaired, which involves the cost and consumes a lot of time as well as reduce the reliability of manufactures. This paper presents the application of acoustic emission (AE) technique for monitoring and detecting the discontinuities during welding. In this study, gas tungsten arc welding (GTAW) was selected as test process. Carbon steel plate and autogenous welding technique were used to simulate the hot crack. The data acquisition (DAQ) and AE sensor were used to capture the acoustic signal generated during welding. The AE signals were amplified and filtered by using a preamplifier. Then, signals were modified by wavelet transforms (WT) technique and classified by Fast Fourier Transform (FFT) technique. The results showed the possibility to use AE technique for monitoring and detecting the low signal amplitude generated from crack by using frequency domain. The advantage of this research is to propose the technique for monitoring the weld metal discontinuities during welding.
机译：声发射测试可用于检测材料破裂产生的能量，该方法的优点是实时监控，但是通常使用常规的NDT方法（例如渗透剂测试（PT），磁粉测试）检查焊缝金属的不连续性（MT），超声波测试（UT）和射线照相测试（RT）。焊接缺陷必须修复，这涉及成本，并且消耗大量时间，并且降低了制造的可靠性。本文介绍了声发射（AE）技术在监测和检测焊接过程中的不连续性中的应用。在这项研究中，选择了钨极氩弧焊（GTAW）作为测试过程。碳钢板和自焊接技术模拟了热裂纹。数据采集​​（DAQ）和AE传感器用于捕获焊接过程中产生的声音信号。通过使用前置放大器放大和过滤AE信号。然后，信号通过小波变换（WT）技术进行修改，并通过快速傅立叶变换（FFT）技术进行分类。结果表明，利用AE技术通过频域监测和检测裂纹产生的低信号幅度的可能性。这项研究的优势是提出了一种在焊接过程中监测焊接金属不连续性的技术。

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  • 来源
  • 会议地点 Bangkok(TH)
  • 作者

    Sittisak Charunetratsamee; Bovornchok Poopat; Chalermkiat Jirarungsatean;

  • 作者单位

    Department of Production Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok, 10140, Thailand;

    Department of Production Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok, 10140, Thailand;

    Department of Production Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok, 10140, Thailand;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Acoustic Emission; Welding; Discontinuities; Monitoring;

    机译：声发射；焊接;间断性；监控方式;

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