Detecting Stress Corrosion Cracking with Eddy Current Array Technology Cracking
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1 Detecting Stress Corrosion Cracking with Eddy Current Array Technology Cracking Emilie Peloquin, : emilie.peloquin@olympus ossa.com Advanced Technical Support Team Lead Americas Olympus Scientific Solutions Americas Houston, TX. U.S.A. Myriam Anzola MsC Ingeniera Mecánica, MBA dircomercial@tecsud.com Tecsud S.A.S., Bogotá, Colombia. Keywords: Stress Corrosion Cracking; Eddy Current Array; Magnetic Particle and Liquid Penetrant replacement. 1. Abstract. The inspection world is always striving for efficiency without compromising accuracy. This paper examines the replacement of Liquid Penetrant and Magnetic Particle testing two methods that are highly time consuming and limited in accuracy with Eddy Current technology. Eddy Current has been long known in the aerospace industry for its accuracy in crack inspection of aluminum. Using the same technology, it is now possible to multiplex the signals to create an array of coils (Eddy Current Array). ECA not only provides accurate detection, but permits the creation of a C Scan image of the returned signal building a visual reference that is easy to interpret, as well as a means to evaluate depth of the indications. This presentation will discuss the multiple advantages of using Eddy Current Array over other conventional methods and will demonstrate examples of previous inspections for comparison. 2. Problem. Stress corrosion cracking (SCC) is the growth of crack formation in a corrosive environment. It can lead to unexpected sudden failure of normally ductile metals subjected to a tensile stress, especially at elevated temperature in the case of metals (1)
2 Fig. 1. Stress Corrosion Cracking There are different techniques of detect SCC like : Wet Fluorescent Magnetic Particle Testing (aka Wet MT) White Contrast Magnetic Particle Testing (MT) Depth sizing with Ultrasound (UT) or Phased Array (PA) Eddy Current Array (ECA) Fig. 2. Section of Carbon Steel Pipe with SCC found with White Contrast Magnetic Particle Testing
3 3. How does Eddy Current works? Eddy current testing is based on the physics phenomenon of electromagnetic induction. In an eddy current probe, an alternating current flows through a wire coil and generates an oscillating magnetic field. If the probe and its magnetic field are brought close to a conductive material like a metal test piece, a circular flow of electrons known as an eddy current will begin to move through the metal like swirling water in a stream. That eddy current flowing through the metal will in turn generate its own magnetic field, which will interact with the coil and its field through mutual inductance. Changes in metal thickness or defects like near surface cracking will interrupt or alter the amplitude and pattern of the eddy currents and the resulting magnetic field. This in turn affects the movement of electrons in the coil by varying the electrical impedance of the coil. The eddy current instrument plots changes in the impedance amplitude and phase angle, which can be used by a trained operator to identify changes in the test piece. Eddy current density is highest near the surface of the part, so that is the region of highest test resolution. The standard depth of penetration is defined as the depth at which the eddy current density is 37% of its surface value, which in turn can be calculated from the test frequency and the magnetic permeability and conductivity of the test material. Thus, variations in the conductivity of the test material, its magnetic permeability, the frequency of the AC pulses driving the coil, and coil geometry will all have an effect on test sensitivity, resolution, and penetration. There are many factors that will affect the capabilities of an eddy current inspection. Eddy currents traveling in materials with higher conductivity values will be more sensitive to surface defects but will have less penetration into the material, with penetration also being dependent on test frequency. Higher test frequencies increase near surface resolution but limit the depth of penetration, while lower test frequencies increase penetration. Larger coils inspect a greater volume of material from any given position, since the magnetic field flows deeper into the test piece, while smaller coils are more sensitive to small defects. Variations in permeability of a material generate noise that can limit flaw resolution because of greater background variations. While conductivity and permeability are properties of the test material that are outside of the operator's control, the test frequency, coil type, and coil size can be chosen based on test requirements. In a given test, resolution will be determined by the probe type while detection capability will be controlled by material and equipment characteristics. Some inspections involve sweeping through multiple frequencies to optimize results, or inspection with multiple probes to obtain the best resolution and penetration required to detect all possible flaws. It is always important to select the right probe for each application in order to optimize test performance (2).
4 Fig. 3. Basic Principles a Inducing a current into a coil will create a magnetic field (in blue). b When the coil is placed over a conductive part, opposed alternating currents (eddy currents, in red) are generated. c The defects in the part will disturb the path of the eddy currents (in yellow). Fig. 4. Conventional Eddy Current Equipment and signal 4. The Eddy Current Array: Eddy Current Array testing, or ECA, is a technology that provides the ability to simultaneously use multiple eddy current coils that are placed side by side in the same probe assembly. Each individual coil produces a signal relative to the phase and amplitude of the structure below it. This data is referenced to an encoded position and time and represented graphically as a C scan image showing structures in a planar view. In addition to providing visualization through C scan imaging, ECA allows coverage of
5 larger areas in a single pass while maintaining high resolution. ECA can permit use of simpler fixture, and can also simplify inspection of complex shapes through custom probes built to fit the profile of the test piece (2). Advantages of Eddy Current Array Testing: Allows inspection through paint or thin coatings No need to clean the part Large coverage (probe length) Very fast scanning C Scan Color Imagery Defect depth evaluation Easy Archiving (Saving Data) and post Analysis 5. Technology: The SCC can be inspected with Eddy Current Array with the combination of the following elements: the OmniScan MX TM with ECA module, a surface probe or a flex array probe, an encoder. Fig. 5 OmniScan and Eddy Current Array Results with the OmniScan
6 6. Conclusion: The Eddy Current Array is a very efficient replacement of Liquid Penetrant and Magnetic Particle testing to do inspection of SCC. The Eddy Current Array Technology (ECA) not only provides accurate detection, but permits the creation of a C Scan image of the returned signal building a visual reference that is easy to interpret, as well as a means to evaluate depth of the indications. References: 1. ASM International, Metals Handbook (Desk Edition) Chapter 32 (Failure Analysis), American Society for Metals, (1997) pp to Nelligan T.; Candelwood C., Introduction to Eddy Current Testing.
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