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eddy current method

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Published: 01 April 2013
Fig. 11 Eddy current flaw detection method for cold-drawn hexagonal bars. (a) Location of artificial flaws ranging from 0.5 to 19 mm (0.020 to ¾ in.) below probe position. (b) Schematic of setup for standard voltage comparison (encircling coil) method (left) and plot of signals obtained More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720345
EISBN: 978-1-62708-305-8
... Abstract Wrought tubular products are nondestructively inspected chiefly by eddy current techniques (including the magnetic flux leakage technique) and by ultrasonic techniques. The methods discussed in this chapter include eddy current inspection, flux leakage inspection, ultrasonic inspection...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720321
EISBN: 978-1-62708-305-8
..., rotating type eddy current flaw detection has been used in combination with rotating ultrasonic flaw detection to detect surface defects and inside flaws, respectively, in a two step process. However, the high cost and inefficiency of this method have prompted the development of a system with a rotating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720183
EISBN: 978-1-62708-305-8
... inspection, quite high rates of production can be attained. While liquid penetrant inspection is primarily a manual operation, the equipment requirements are less than for magnetic particle or eddy current inspection. Liquid Penetrant Inspection Liquid penetrant inspection is a nondestructive method...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720293
EISBN: 978-1-62708-305-8
..., liquid penetrant inspection, eddy current inspection, and magnetic particle inspection, which can also reveal discontinuities situated immediately below the surface. All these inspection methods require clean and relatively smooth surfaces for effective results. Methods for Detecting Internal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060149
EISBN: 978-1-62708-261-7
...-ray, and eddy current testing. fracture toughness metallography fatigue testing hardness testing nondestructive testing tensile testing THE LEVEL OF QUALITY of a product or service may be judged by the customer based upon conformance to the relevant set of specifications or standards...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720411
EISBN: 978-1-62708-305-8
... of nondestructive inspection of weldments including visual inspection, liquid penetrant inspection, magnetic particle inspection, radiographic inspection, ultrasonic inspection, leak testing, and eddy current and electric current perturbation inspection. The chapter also describes the properties of brazing filler...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220009
EISBN: 978-1-62708-341-6
... reviews the mechanistic basis for induction heating and provides an example of eddy-current distribution in a solid bar. The chapter defines two important concepts in the technology of induction heating: equivalent resistance and electrical efficiency. The chapter concludes with a discussion of methods...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720365
EISBN: 978-1-62708-305-8
... these flaws include visual, magnetic particle, liquid penetrant, ultrasonic, eddy current, and radiographic inspection. This chapter provides a detailed discussion on the characteristics, process steps, applications, advantages, and limitations of these methods. It also describes the flaws caused...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720001
EISBN: 978-1-62708-305-8
... testing methods discussed are liquid penetrant inspection, magnetic particle inspection, eddy current inspection, radiographic inspection, and ultrasonic testing. chemical analysis coordinate measuring machines hardness testing machine vision metallography nondestructive testing tensile...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050245
EISBN: 978-1-62708-311-9
... account for about 50% of all NDT testing, with ultrasonic and x-ray methods accounting for about another third. Eddy current accounts for approximately 10%. All other methods were about 2%. Table 12.4 provides examples on the relative uses and merits of various NDT methods from an operational viewpoint...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500301
EISBN: 978-1-62708-317-1
..., such as tensile test and bulge test. Nondestructive methods, such as eddy current testing, avoid this problem. Furthermore, these methods can be used online without disturbing the production rate as well as make it possible to automatically monitor each and every sheet ( Ref 15.2 , 15.25 ). Theory of Eddy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930085
EISBN: 978-1-62708-359-1
.... There are five principal test methods: penetrant testing, magnetic-particle testing, eddy-current testing, radiographic testing, and ultrasonic testing. Although visual inspection is not strictly a test method, it does have an important role in NDE procedures and is often the only inspection method used...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220143
EISBN: 978-1-62708-341-6
... development and may find some use in the future. These methods include those based on ultrasonics, eddy-current detection, and real-time measurement of coil current or impedance during induction heating. Each of these is briefly discussed below. Ultrasonic Methods<xref ref-type="fn" rid="t65220143-fn6">[6...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930057
EISBN: 978-1-62708-359-1
... welded pipe and tubing because eddy currents are relatively insensitive to flaws that do not extend to the surface or into the near-surface layer. Magnetic particle inspection and liquid penetrant inspection are not suitable for detecting subsurface gas porosity. These methods are restricted...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220001
EISBN: 978-1-62708-341-6
... Vacuum Induction Melting Ingots Billets Castings “Clean” steels Nickel-base superalloys Titanium alloys As its name implies, induction heating relies on electrical currents that are induced internally in the material to be heated–i.e., the workpiece. These so-called eddy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860163
EISBN: 978-1-62708-348-5
... by Morrison (1967) . 5.2.3 Eddy Current Method An ac technique that has proven very useful in relative resistivity determinations is the eddy current decay method. The basis for the method is described by Bean, DeBlois, and Nesbitt (1959) , and detailed description of a working system is given...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870333
EISBN: 978-1-62708-314-0
..., shear wave), bond tests (resonance, pitch/catch, mechanical impedance) and eddy current (single and dual frequency). Summary of bond testing techniques Table 12.1 Summary of bond testing techniques Resonance method Transducer is driven at the resonance frequency (25–500 kHz), causing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440159
EISBN: 978-1-62708-262-4
... to the interior is by inducing current into a steel workpiece. The induced current has a tendency to swirl in much the same fashion as a pool of water swirls when stirred with a stick. The swirling effect of the current is known as eddy current, and it induces heat. The eddy current effect probably is the major...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220241
EISBN: 978-1-62708-341-6
... larger eddy currents in the workpiece. Fig. 9.1 Concentrating effect of a permeable core on a magnetic flux field Materials for Flux Concentrators Materials for flux concentrators are of two basic types: (1) packages of laminated silicon steel punchings used at frequencies below 10 kHz...