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Description of ASTM-A966 2012ASTM A966 / A966M - 08(2012)Standard Practice for Magnetic Particle Examination of Steel Forgings Using Alternating CurrentActive Standard ASTM A966 / A966M | Developed by Subcommittee: A01.06 Book of Standards Volume: 01.05 ASTM A966 / A966MSignificance and Use For ferromagnetic materials, magnetic particle examination is widely specified for the detection of surface and near-surface flaws such as cracks, laps, seams, and linearly oriented nonmetallic inclusions. Such examinations are included as mandatory requirements in some forging standards such as Specifications A508/A508M and . Use of alternating current as the power source for magnetic particle examination imposes a significant restriction on the detection of subsurface indications, so that the procedure is essentially limited to the finding of flaws that are open to the surface. Attention therefore is drawn to the need to have the component in the finish-machined condition before conducting the magnetic particle examination. The presence of residual magnetic fields in a component may be undesirable, and an advantage of the use of an AC power source for magnetic particle examination is that an acceptable level of demagnetization can be readily achieved. 1. Scope 1.1 This practice covers a procedure for the magnetic particle examination of steel forgings using alternating current as the power source. The procedure will produce consistent results upon which acceptance standards can be based. This practice does not contain acceptance limits or recommended quality levels. 1.2 Only alternating 50 60 cycle current shall be used as the electric power source for any of the magnetizing methods. 1.3 When subsurface indications are sought in forgings, then dc magnetization in accordance with Practice A275/A275M should be used. 1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Unless the order specifies the applicable M specification designation [SI units], the inch-pound units shall be used. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM Standards A275/A275M Practice for Magnetic Particle Examination of Steel Forgings A508/A508M Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels A963/A963M Specification for Deep Drawing Steel (DDS), Sheet, Carbon, Cold-Rolled Other Document PracticeNo.SNT-TC-1A Supplement B--Magnetic Particle Method Available from American Society for NonDestructive Testing, 1711 Arlingate Lane, P.O. Box 28518, Columbus, OH 43228-0518.Keywords ac magnetization; circular magnetization; dry method; ferritic steel forgings; fluorescent method; longitudinal magnetization; surface flaw detection; wet method ; A-C (alternating-current) magnetic properties; Magnetic particle inspection; Magnetic properties; Steel forgings ICS Code ICS Number Code 77.040.20 (Non-destructive testing of metals) DOI: 10.1520/A0966_A0966M-08R12 ASTM International is a member of CrossRef. ASTM A966 / A966MThis book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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