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Analysis of vibration signal responses on pre induced tunnel defects in friction stir welding using wavelet transform and empirical mode decomposition

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Defence technology（防务技术） 2019年第6期15卷 885-896页

作者： J.Rabi t.balusamy R.Raj Jawahar Vinayaka Mission’s Kirupananda Variyar Engineering College SalemIndia Department of Mechanical Engineering Government College of EngineeringSalemIndia Department of Mechanical Engineering Dynamech Design SolutionsChennaiIndia

Among many condition-monitoring systems in welding operation,Defect identification is an important method to ensure the precision in finishing *** stir welding is a solid state welding process used to join two metals without the use of electrode at lower *** aim of this present work is to identify and localize the tunnel defect in aluminum alloy and measure the distance of the defect zone in the time domain of the vibration signal during Friction stir *** vibration signals are captured from the experiments and the burst in the vibration signal is focused in the analysis.A signal-processing scheme is proposed to filter the noise and to measure the dimensional parameters of the defect *** proposed technique consists of discrete wavelet transform(DWt),which is used to decompose the *** enveloping technique is applied on the decomposed zero padded *** continuous wavelet transform(CWt) has been implemented on detailed signal followed by a time marginal integration(tMI) of the CWt *** mode decomposition(EMD) is used to replace the detailing coefficients from DWt with Intrinsic Mode Function(IMF).Statistical parameters such as mean,kurtosis,S.D and crest factor have been extracted from the final filtered signal for validating the defect welds from the control defect free *** produced were found to be that kurtosis is 7.4402 for tunnel defect induced weld and 3.3862 for defect free *** the increase in kurtosis value predicts the defect zone impact in the *** measurement of the defect zone of the cut 1(voids) and cut 2(tunnel grooves) in correlation with the processed signal is found to produce a much redundant results with an error rate of 0.02.

关键词： welding friction alloy

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Characterization of magnetically impelled arc butt welded t11 tubes for high pressure applications

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Defence technology（防务技术） 2015年第3期11卷 244-254页

作者： R.SIVASANKARI V.balusamy P.R.VENKAtESWARAN G.BUVANASHEKARAN K.GANESH KUMAR Department of Metallurgical Engineering PSG College of Engineering Welding Research Institute Bharat Heavy Electricals Limited

Magnetically impelled arc butt(MIAB) welding is a pressure welding process used for joining of pipes and tubes with an external magnetic field affecting arc rotation along the tube circumference. In this work, MIAB welding of low alloy steel(t11) tubes were carried out to study the microstructural changes occurring in thermo-mechanically affected zone(tMAZ). to qualify the process for the welding applications where pressure could be up to 300 bar, the MIAB welds are studied with variations of arc current and arc rotation time. It is found that tMAZ shows higher hardness than that in base metal and displays higher weld tensile strength and ductility due to bainitic transformation. the effect of arc current on the weld interface is also detailed and is found to be defect free at higher values of arc currents. the results reveal that MIAB welded samples exhibits good structural property correlation for high pressure applications with an added benefit of enhanced productivity at lower *** study will enable the use of MIAB welding for high pressure applications in power and defence sectors.

关键词：磁控电弧磁场影响高压力应用压力焊接特性对焊驱动

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