焊缝超声波检测中缺陷指示长度的测定

(,310020)MEASUREMENTOFTHEINDICATINGLENGTHOFWELDDEFECTINULTRASONICINSPECTIONCHENGMao(ZhejiangBoilerandPressureVesselInspectionInstitute,Hangzhou310020,China):TG115.28+5:B:100026656(2002)0320129203,,,,,,,11.1Dc()Dc1()Dc2()(),,Dc1()[1]Dc1()=P(r,)P(r,0)=2J1(KDsin)KDsin(1)J1P(r,)rP(r,0)rD:2001208207KK=2/Dc2(),(1),,Dc1()=Dc2(),Dc()=[Dc1()]2[2],(6dB,Dc=0.5)1/10(20dB,Dc=0.1),w6w20(1),y=KDsin,Dc=0.5y=1.62w6=arcsin0.52D29DDc=0.1y=2.77w20=arcsin0.88D50D1.21,w6,S,L6;S1,L6w20,S,L20;S1,L20L,L6LL6,S,6dB,92124320023NDTVol.24No.3Mar.2002©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1L6,20dBL20;LL6LL20,LS16dB,L6LL6,L,SL6,,,,,,,,,,,,,LLx,Lx()Lx=2hKtgxhK=tgx2,,,,2.12,,,,232.23,,,,;,,,2.34a,T,,,;,,,,,,,,,,,(4),(EL),,T,,,,4031:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.T,,,,,,,,,2.4,,,,,,;,,5,(SL),,l2;(EL),,l1l25,,,,16dB,210dB,,,,,,,,,,,,,,,,,,,,,,,6mm,,,3JB47301994,,6dB;,,6dB(GB113451989);,(1)6dB6dB,,,,(2),,,(3)6dB,,,,(4),(5),,,,4,,,,,,,,:[1].(,)[Z].:,1995.[2],,,,.B[M].:,1985.131:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.