Analytical and Experimental Approaches for the Sizing of Fatigue Cracks in Inconel Welds by Eddy Current Examination

2004 ◽  
Author(s):  
Weiying Cheng ◽  
Ichirou Komura ◽  
Mitsuharu Shiwa
Keyword(s):  
Eddy Current ◽  
Power Plants ◽  
Base Alloy ◽  
Fatigue Cracks ◽  
Flaw Detection ◽  
Current Method ◽  
Nickel Base Alloy ◽  
Eddy Current Method ◽  
Experimental Approaches ◽  
Nickel Base

Cracks by SCC (stress corrosion cracking) and high cycle fatigue were detected at the welded joints of nickel based alloy of reactor vessel, pressurizer and core internal of nuclear power plants in recent years. To ensure the integrity of plants, it is necessary to improve NDT (non-destructive testing) techniques for reliable detection and evaluation of defects in the nickel-base alloy. Basic studies on the flaw detection and characterization by eddy current examination of inconel, a typical nickel-base alloy, are carried out. Specimens made of inconel and inconel weld metal are prepared, fabricated with EDM (Electro-Discharge Machining) notches and fatigue cracks. The detecting and sizing capability of eddy current method is investigated through analytical and experimental approaches. Numerical analysis helps in choosing an appropriate probe and examination condition, and evaluating a crack from the measured signals. All or part of a planar crack is reconstructed using an inversion approach. The result from ECT (eddy current testing) is compared with that of UT (ultrasonic testing). The research presented in this paper shows that by choosing a proper testing situation, eddy current examination is feasible for the detection and sizing of surface-breaking cracks in inconel welds.

Eddy Current Examination of Fatigue Cracks in Inconel Welds

2006 ◽  
Vol 129 (1) ◽  
pp. 169-174 ◽  
Author(s):  
Weiying Cheng ◽  
Ichiro Komura ◽  
Mitsuharu Shiwa ◽  
Shigeru Kanemoto
Keyword(s):  
Eddy Current ◽  
Nuclear Power ◽  
Power Plants ◽  
Base Alloy ◽  
Fatigue Cracks ◽  
Current Method ◽  
Destructive Testing ◽  
Eddy Current Method ◽  
Nickel Base ◽  
Basic Studies

Basic studies on the eddy current examination of defects in Inconel, a typical nickel-base alloy used in the reactor vessel, pressurizer, and core internal of nuclear power plants, are carried out. The detecting and sizing capability of the eddy current method is investigated through analytical and experimental approaches. Probe’s detectability is numerically evaluated, and appropriate probe and examination conditions are correspondingly selected. The numerical signal calculation and crack reconstruction approach is confirmed in terms of the study of the eddy current examination of electrodischarge machining notches in Inconel base metal, and further applied to eddy current examination of fatigue cracks in Inconel welds. The profiles of fatigue cracks are reconstructed using eddy current testing signals. Crack depths estimated by eddy current reconstruction agree well with that of ultrasonic testing and are consistent with the crack depths revealed from destructive testing. The research presented in this paper shows that by choosing a proper testing situation, eddy current examination is feasible for detecting and sizing of surface-breaking cracks in Inconel welds.

An Eddy-Current Method of Flaw Detection in Nonmagnetic Metals

1941 ◽  
Vol 8 (1) ◽  
pp. A22-A26
Author(s):  
Ross Gunn
Keyword(s):  
Eddy Current ◽  
Eddy Currents ◽  
Flaw Detection ◽  
Current Method ◽  
Test Sample ◽  
Current Pattern ◽  
Eddy Current Method ◽  
Recorded Performance ◽  
Alternating Magnetic Fields ◽  
Nonmagnetic Metals

Abstract An equipment suitable for the location of surface or submerged flaws in nonmagnetic metals is described. A predetermined pattern of electrical eddy currents is induced in a perfect test sample by alternating magnetic fields. Sensitive pickup coils properly disposed in relation to the eddy currents measure only the departures of the eddy-current pattern from the pattern in the perfect sample. The departures are indicated on a meter or may be recorded. Performance data are given for a universal type of search unit especially adapted for general surveys.

scholarly journals Investigation of welds by the method of the magneto-optical eddy current flaw detection

2018 ◽  
Vol 185 ◽  
pp. 02014 ◽  
Author(s):  
Nazar Lugovskoy ◽  
Vladimir Berzhansky ◽  
Dmitry Filippov ◽  
Anatoliy Prokopov ◽  
Alexandr Shuyskyy
Keyword(s):  
Mathematical Modeling ◽  
Magnetic Fields ◽  
Eddy Current ◽  
Eddy Currents ◽  
Flaw Detection ◽  
Current Method ◽  
Epitaxial Films ◽  
Eddy Current Method ◽  
Ferrite Garnet ◽  
Conducting Materials

The paper deals with the magneto-optical eddy current method of flaw detection of conducting materials, in which epitaxial films of ferrite garnet are used as sensors. In particular, the possibilities of visualization of welded seams in magnetic and non-magnetic samples, as well as the defectoscopy of the seams themselves, are considered. The second part of the work is devoted to mathematical modeling of the distribution of the magnetic fields of eddy currents near similar defects.

Grinding Burns Testing — New NDT Method? Do You Need Qualified Specialists for This?

NDT World ◽  
2021 ◽  
pp. 28-31
Author(s):  
Martin W. Seidel ◽  
Antje Zösch ◽  
Konstantin Härtel ◽  
Gunnar Morgenstern
Keyword(s):  
Eddy Current ◽  
Chemical Etching ◽  
Flaw Detection ◽  
Current Method ◽  
Machine Building ◽  
Theory And Practice ◽  
Final Exam ◽  
Eddy Current Method ◽  
Grinding Burn ◽  
Multi Stage

The highly loaded components used in machine building, automotive and aviation must have no thermal damage during grinding, the so-called grinding burn. In less loaded components, the grinding burn shall not exceed a certain level agreed between the manufacturer and the customer. In industrial practice, etching, Barkhausen-Rausch methods and eddy current are used to detect burns. To reliably perform inspection according to any of the methods, it is necessary that the flaw detection experts have sufficient knowledge and skills. This is particularly relevant for the multi-stage chemical etching process. In 2015, at the request of Turkish partners, IMQ developed the course "Inspection of grinding burns using chemical etching" in accordance with ISO 14104 and AMS 2649. Since then, more than 70 participants from several European countries have successfully completed this two-day course. In cooperation with DGZfP Ausbildung und Training GmbH, IMQ has developed a new course for the training of flaw detectors in the burns inspection during grinding. In addition to the etching method, the course included the eddy current method and the Barkhausen method, as well as liquid penetrant testing and magnetic powder testing. The content of the course, practical exercises and elements of the final exam in theory and practice are presented.

Initiation of PWSCC in Nickel Base Alloy 182

2013 ◽  
Author(s):  
Mickaël Wehbi ◽  
Jérôme Crépin ◽  
Thierry Couvant ◽  
Cécilie Duhamel
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Base Alloy ◽  
Nickel Base Alloy ◽  
Pressurized Water ◽  
Material Environment ◽  
Primary Water ◽  
Water Reactors ◽  
Nickel Base ◽  
Actual Initiation

To date, welded nickel base alloy 182 used in Pressurized Water Reactors (PWRs) components have shown a higher susceptibility to Primary Water Stress Corrosion Cracking (PWSCC) during laboratory tests than in power plants. However, an increasing number of cracks reported in American, Swedish and Japanese nuclear power plants on Alloy 182 enlighten the need for a predictive initiation model of PWSCC. Initiation of PWSCC involves several factors such as material, environment and loading history, interacting with each other. Building such a model first requires to focus on these parameters separately, in order to have a better understanding of the involved mechanisms at a local scale in crack initiation. This study focuses on the correlation between EBSD/strain field results to improve the accuracy of the actual initiation model [1] involving local parameters.

scholarly journals Nickel-Base Alloy Solutions for Ultrasupercritical Steam Power Plants

2013 ◽  
Vol 55 ◽  
pp. 221-225 ◽  
Author(s):  
D.L. Klarstrom ◽  
L.M. Pike ◽  
V.R. Ishwar
Keyword(s):  
Power Plants ◽  
Base Alloy ◽  
Nickel Base Alloy ◽  
Steam Power ◽  
Steam Power Plants ◽  
Nickel Base

Flaw detection of alloys using the eddy-current method

2016 ◽  
Vol 52 (1) ◽  
pp. 32-37 ◽  
Author(s):  
S. F. Dmitriev ◽  
A. O. Katasonov ◽  
V. N. Malikov ◽  
A. M. Sagalakov
Keyword(s):  
Eddy Current ◽  
Flaw Detection ◽  
Current Method ◽  
Eddy Current Method
Sign in / Sign up

Export Citation Format

Share Document