(214028),;TOFD,,A,BCD,,TOFD2090,,():(1);(2);(3),;(4),UT,UTTOFD(),,ABCD(),11.1,(1)1.2,,,;,(a)10(b)44(c)41(),(),(),2,,,3,,,:(1);(2)120023()©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.232UT,,,,UT,,(),,TOFD(),BCD,,,UT2.1,,,,4,:,;,,,A:(),(),UT,:(1)AB;(2)D;(3)C(P)(),(a)(b)45BC,6D20705UTBC2()20023©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.6UTD2.2TOFD2.2.1TOFD1970SilkM.G.TOFD(TimeofFlightDiffrac2tion):,,D(6):(1);(2);(3);(4)(a)(b)TOFDA7TOFD():,,,360(7),,,5MHz1010mm,H10;TOFD,(66mm),C1.8,K1.8,H1.72.2.2TOFDTOFD,,,,,TOFD,DTOFDD,(8)TOFD,,,,33.1X32mm,,:,115mm645,:1mm,:,2mm,TOFD(15mm),(13.5mm)TOFD,,,2mm320023()X():Ni80%,Cr14%;Fe6%©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.3.240mm(SUS304),(45)10mm,,,10mm,,8TOFD(AD)20mm10mm,,,23mm3.33.3.1,ASTM(E19611998),,23mm,TOFD91012mm912mm4()20023©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1012mm3.3.2UT(),,,UT,UT,,UT,UT,1001320mm,635mm,;,1UT11999,,19992000ETPM2000DNV.20004(1)UT,,,,,TOFD,;TOFD,,UT(2),UT,,UT(+TOFD),,,,UT,,(3)UT,,,UT,,UT(4)UT,UTBCD,,,(5),UT,UT,UT,1E.A.Ginzel.ReportontheEvaluationofaPhasedArraySystemUsingtheZonalDiscrimina2tionTechniqueforPipelineGirthWeldInspectionR.The15thWorldConferenceonNondestruc2tiveTesting.2000.102.TOFDJ.,1995,10:72793.µÆ}¨Ì,2001,49(10):68724.µÆ}¨Ìº·ÉÓ,2001,49(10):73835E.Ginzel,P.denBoer,MervHoff.ApplicationofMechanisedUltrasonicInspectiontoManuallyWeldedPipelineGirthWeldsJ.UTOnlineJour2nal,1996520023()©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.