ASTM_E_1158_-_14.pdf

Designation:E115814Standard Guide forMaterial Selection and Fabrication of Reference Blocks forthe Pulsed Longitudinal Wave Ultrasonic Testing of Metaland Metal Alloy Production Material1This standard is issued under the fixed designation E1158;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This guide covers general procedures for the materialselection and fabrication of reference blocks made of metal ormetal alloys and intended to be used for the examination of thesame or similar production materials by pulsed longitudinalultrasonic waves applied perpendicular to the beam entrysurface.Primary emphasis is on solid materials but some of thetechniques described may be used for midwall examination ofpipes and tubes of heavy wall thickness.Near-surface resolu-tion in any material depends upon the characteristics of theinstrument and search unit employed.1.2 This guide covers the fabrication of reference blocks foruse with either the immersion or the contact method ofultrasonic examination.1.3 Reference blocks fabricated in accordance with thisguide can be used to determine proper ultrasonic systemoperation.Area-amplitude and distance-amplitude curves canalso be determined with these reference blocks.1.4 This guide does not specify reference reflector sizes orproduct rejection limits.It does describe typical industryfabrication practices and commonly applied tolerances wherethey lend clarity to the guide.In all cases of conflict betweenthis guide and customer specifications,the customer specifica-tion shall prevail.1.5 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.6 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and to determine the applicability of regula-tory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E127 Practice for Fabricating and Checking Aluminum Al-loy Ultrasonic Standard Reference Blocks3E428 Practice for Fabrication and Control of Metal,Otherthan Aluminum,Reference Blocks Used in UltrasonicTestingE1316 Terminology for Nondestructive Examinations3.Terminology3.1 DefinitionsFor definitions of terms used in this guide,see Terminology E1316.4.Summary of Guide4.1 This guide describes a method of selecting suitablereference block material from current or previous productionand the subsequent fabrication and checking of the resultingultrasonic reference blocks.5.Significance and Use5.1 This guide is intended to illustrate the fabrication ofultrasonic reference blocks that are representative of theproduction material to be examined.Care in material selectionand fabrication can result in the manufacture of referenceblocks that are ultrasonically similar to the production materialthus eliminating the reference block as an examination vari-able.6.Material Selection6.1 It is good practice to use a sample removed from theproduction lot of material as the reference block material.When this is not possible the following guidelines should befollowed.1This guide is under the jurisdiction of ASTM Committee E07 on Nondestruc-tive Testing and is the direct responsibility of Subcommittee E07.06 on UltrasonicMethod.Current edition approved June 1,2014.Published July 2014.Originally approvedin 1990.Last previous edition approved in 2009 as E1158-09.DOI:10.1520/E1158-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The reference blocks in Practice E127 are used to check the performance ofultrasonic examination equipment and for standardization and control of ultrasonicexaminations of aluminum alloy products.The ultrasonic response of the blocks inPractice E127 is evaluated against a standard target.The blocks described in thisstandard are used for the examination of production material and may be used toestablish accept-reject criteria.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 The reference block material should be of the samegeneral shape and dimensions,surface finish,chemicalcomposition,and microstructure as the production material tobe examined.6.3 To ensure that the material chosen is suitable for use asreference block material and is free of potentially interferingreflectors,ultrasonically examine the reference bl