1、Designation:E12715Standard Practice forFabrication and Control of Aluminum Alloy UltrasonicStandard Reference Blocks1This standard is issued under the fixed designation E127;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This practice covers a procedure for
3、 fabricating alumi-num alloy ultrasonic standard reference blocks that can be usedfor assessing performance of ultrasonic testing equipment andfor standardization and control of ultrasonic tests of aluminumalloy products using pulsed longitudinal waves introduced intotest material either by the dire
4、ct-contact method or by theimmersion method.(1-18).2NOTE1Practice E428 and Guide E1158 also describe procedures forselecting material,fabricating blocks,and checking response.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibilit
5、y of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3E317 Practice for Evaluating Performance Characteristics ofUltrasonic Pulse-Echo Testing Instruments
6、and Systemswithout the Use of Electronic Measurement InstrumentsE428 Practice for Fabrication and Control of Metal,Otherthan Aluminum,Reference Blocks Used in UltrasonicTestingE1065 Practice for Evaluating Characteristics of UltrasonicSearch UnitsE1158 Guide for Material Selection and Fabrication of
7、Reference Blocks for the Pulsed Longitudinal Wave Ul-trasonic Testing of Metal and Metal Alloy ProductionMaterialE1316 Terminology for Nondestructive ExaminationsE1324 Guide for Measuring Some Electronic Characteristicsof Ultrasonic Testing InstrumentsE2375 Practice for Ultrasonic Testing of Wrought
8、 ProductsB594 Practice for Ultrasonic Inspection of Aluminum-AlloyWrought Products3.Terminology3.1 DefinitionsFor definitions of terms not specific to thispractice,refer to Terminology E1316.3.2 Definitions of Terms Specific to This Standard:3.2.1 angular errorthe condition observed in ultrasonictes
9、ts of reference blocks when the response from the holebottom is not maximum while the search unit is positioned toobtain either a maximum number of back reflections from areference block or a maximum indication from its entrysurface.Angular error results when the entry surface,holebottom,and back su
10、rface are not parallel to each other.3.2.2 area-amplitude response curvea curve showing therelationship between different areas of reflecting targets locatedat a constant distance in an ultrasonic transmitting medium andtheir respective amplitudes of ultrasonic response.3.2.3 entry surfacethe end of
11、 a reference block throughwhich ultrasonic energy must pass when reflections from thehole bottom are obtained.3.2.4 hole bottomthe flat reflecting surface in a referenceblock that is obtained by making the entire end of a drilled holesmooth and flat using best machining practices.The holebottom is p
12、arallel to the entry surface of the block.3.2.5 hole sizethe diameter of the hole in a reference blockthat determines the area of the hole bottom.3.2.6 metal distancethe distance in a reference block fromits entry surface to the hole bottom.4.Summary of Practice4.1 Aluminum alloy stock is ultrasonic
13、ally evaluated toensure freedom from significant discontinuities and is thenprecisely fabricated into cylindrical blocks of prescribedlengths.Asingle,flat-bottom hole of specific diameter is drilledto a constant depth into the end of each block at its center,and1This practice is under the jurisdicti
14、on of ASTM Committee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.06 onUltrasonic Method.Current edition approved June 1,2015.Published June 2015.Originallyapproved in 1958.Last previous edition approved in 2010 as E127-10.DOI:10.1520/E0127-15.2The boldface num
15、bers in parentheses refer to the list of references at the end ofthis practice.3For 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
16、ASTM website.*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 the blocks are grouped into sets according to hole size andblock length,or metal distance.4.2 Each block is checked ultrasonically using a calibratedultrasonic test system at a prescribed test frequency.Distance-amplitude and area-amplitude characteristics are establishedfor sets of fabricated blocks using spec
