Designation:A939/A939M−15StandardPracticeforUltrasonicExaminationfromBoredSurfacesofCylindricalForgings1ThisstandardisissuedunderthefixeddesignationA939/A939M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversabasicprocedureofultrasonicallyinspectingcylindricalforgingswithboresfromtheboresurface.1.2Thispracticeappliestothemanualtestingmode.Itdoesnotrestricttheuseofothertestingmodes,suchasmechanizedorautomated.1.3Thispracticeappliestocylindricalforgingshavingboresizesequaltoorgreaterthan2.5in.[64mm].1.4Thispracticeisexpressedininch-poundandSIunits;however,theinch-poundunitsshallapplyunlessthepurchaseorderorcontractspecifiestheapplicable“M”specificationdesignation(SIunits).ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A788/A788MSpecificationforSteelForgings,GeneralRe-quirements2.2ASNTStandard:3SNT-TC-1ARecommendedPracticeforNon-destructivePersonnelQualificationsandCertification3.SignificanceandUse3.1Thispracticeshallbeusedwhenultrasonicinspectionfromtheboresurfaceisrequiredbytheorderorspecificationforinspectionpurposesinwhichtheacceptanceoftheforgingisbasedonlimitationsofthenumber,amplitude,orlocationofdiscontinuitiesoracombinationthereof,whichleadstoultra-sonicindications.3.2Theacceptancecriteriashallbestatedclearlyasorderrequirements.3.3Th...
