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    Volume 46, Issue 5 (February 2018)

    Postweld Heat Treatment Characterization of Mild Steel (E6013) Welded Areas Using Wavelet Transform of Ultrasonic Testing Signals

    (Received 15 June 2016; accepted 17 March 2017)

    Published Online: 09 February 2018

    CODEN: JTEVAB

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    Abstract

    Ultrasonic testing (UT) is a widely used nondestructive testing technique. The research presented here aims to relate UT signal features to the hardness of welded mild steel material that has undergone postweld heat treatment. The weld specimens were heat treated at different temperatures to emulate different levels of postweld heat treatments in the study. Using destructive methods, the hardness of all the specimens, a mechanical property, is computed. The change in the attenuation of UT signals is related to the change in the hardness. Possible classification of the UT signals acquired from weld areas in terms of different levels of postweld heat treatment is also explored using the continuous wavelet transform (CWT) technique. The CWT technique has been applied to the raw UT signals to compute the wavelet coefficients. Different candidate wavelets are investigated to decide which wavelet offers the best discriminatory strength between UT signals acquired from the samples with postweld heat treatment of different levels. The resulting empirical relationships between hardness and UT signal features are reported in this research work. These relationships will enable the inspectors to predict the hardness of the weld specimen under test just through in situ UT.

    Author Information:

    Khan, Tariq M. R.
    Department of Electrical and Power Engineering, Pakistan Navy Engineering College, National University of Sciences & Technology, Karachi,

    Maqsood, Amna
    Department of Electrical and Power Engineering, Pakistan Navy Engineering College, National University of Sciences & Technology, Karachi,

    Warraich, Saad A.
    Department of Electrical and Power Engineering, Pakistan Navy Engineering College, National University of Sciences & Technology, Karachi,

    Khalid, Saeed
    Department of Electrical and Power Engineering, Pakistan Navy Engineering College, National University of Sciences & Technology, Karachi,


    Stock #: JTE20160315

    ISSN:0090-3973

    DOI: 10.1520/JTE20160315

    Author
    Title Postweld Heat Treatment Characterization of Mild Steel (E6013) Welded Areas Using Wavelet Transform of Ultrasonic Testing Signals
    Symposium ,
    Committee E07