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Gao H.,Innerspec Technologies Inc. | Lopez B.,Innerspec Technologies Inc. | Minguez X.,Innerspec Technologies Europe | Chen J.,Nanjing Entry Exit Inspection and Quarantine Bureau
Proceedings of 2015 IEEE Far East NDT New Technology and Application Forum, FENDT 2015 | Year: 2015

Weld inspection is a recurring topic in nondestructive testing because of the potential safety and environmental impact associated to poor weld quality. Thick-wall, multi-pass welds are very common in construction, bridge building, ship building, pressure vessel, and many other industries. This paper presents a novel technique to provide process and quality control of a partially completed weld after each individual weld pass, which can provide significant savings in time and money. The technique uses electromagnetic acoustic transducer (EMAT) to generate surface acoustic waves that detect defects on the top-most layer of a multi-pass weld. The paper describes the theory and empirical verification on a partially finished weld with 100mm thick base metal. © 2015 IEEE.


Weinmeister F.,Innerspec Technologies Inc.
Technical Paper - Society of Manufacturing Engineers | Year: 2012

The presentation covers the use of electro magnetic acoustic transducer (EMAT) technology for longitudinal weld inspection of ERW tubes. Traditional methods and EMAT solutions are described. EMAT is also presented as a solution for surface inspection, thickness measurement, and skelp inspection. © 2011 Innerspec Technologies, Inc.


Gao H.,Innerspec Technologies Inc. | Ali S.M.,Innerspec Technologies Inc. | Lopez B.,Innerspec Technologies Inc.
AIP Conference Proceedings | Year: 2010

Nondestructive testing of austenitic welds is very important for nuclear, petrochemical, and many other industries. Due to the strong material anisotropy and coarse grain size in the dendritic weld zone, shear horizontal (SH) wave mode is much superior to conventional shear vertical (SV) and longitudinal wave modes. In this paper, an electromagnetic acoustic transducer (EMAT) is designed and used for the inspection of two austenitic weld samples. Compared with piezoelectric transducers, EMAT has lower efficiency in sound generation due to low conductivity of austenitic stainless steel material and strong attenuation in the weld zone. However, using our EMAT probe and cutting edge pulser and receiver, good signal to noise ratio is achieved in our testing. The angle beam EMAT probe successfully detected all defects in the samples with good signal to noise ratio including a 2% defect. The capability of detection a defect across a 2″ inch thick and 2″ wide austenitic weld zone is also demonstrated in the paper. © 2010 American Institute of Physics.


Monks J.S.,Innerspec Technologies Inc.
Iron and Steel Technology | Year: 2010

The in-line electromagnetic acoustic transducers (EMAT) ultrasonic weld inspection method used for ERW tube mills using guided ultrasonic waves is presented. The interaction of elastic waves in the presence of a magnetic field induces currents in the receiving EMAT coil circuit. The magnetostriction produces additional stresses for ferromagnetic conductors that enhance the signals to much higher levels than could be obtained by the Lorentz force alone. The guided waves for ERW weld inspection offer several advantages such as guided waves fill the volume of the material independent of thickness, enabling inspection of the entire weld, and detect hook cracks, zipper welds, lack of fusion. Other advantages include that separate transmitter and receiver permits normalization of the signal for self-calibration, and allows for up to 55° of weld drift with a minimum amount of sensors, resulting in cost-effective systems, easier to install and maintain.


Gao H.,Innerspec Technologies Inc. | Lopez B.,Innerspec Technologies Inc.
Materials Evaluation | Year: 2010

Austenitic welds are widely used in nuclear, petrochemical and process industries. The strong material anisotropy and coarse grain structure in the dendritic weld zone makes these welds very difficult to inspect with conventional techniques. It is well-known that the shear horizontal (SH) wave is well-suited for this inspection and that electromagnetic acoustic transducer (EMAT) is the best technique for generating this wave mode, but the lack of equipment has precluded its application in the field. This paper presents the development of one channel and phased array EMAT systems and results from tests conducted on samples provided by the Electric Power Research Institute (EPRI). The results show the potential of this new equipment for austenitic weld inspection, which opens up new possibilities for research and field use.


Gao H.,Innerspec Technologies Inc. | Ali S.,Innerspec Technologies Inc. | Lopez B.,Innerspec Technologies Inc.
NDT and E International | Year: 2010

This paper presents an efficient method for the detection of delamination using a combined technology of ultrasonic guided wave and electromagnetic acoustic transducer (EMAT). The material for inspection studied in this paper is a three-layered brass/copper/brass metal composite for coin stocks. We first observed a cyclic behavior of wave sensitivity to delamination width in the experiment. This observation is then confirmed with finite element simulation. We found out that the cyclic behavior is related to the phase velocity of the converted wave modes in the two subsystems after delamination. To compensate for the cyclic behavior, two wave modes are used in an industrial inspection system to ensure effective detection of delamination in the composite sample. The inspection speed achieved with this EMAT inspection system is 1.8 m2/s. © 2010 Elsevier Ltd. All rights reserved.

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