钢轨焊缝平面状缺陷探测研究

(,100081),STUDYONULTRASONICDETECTIONOFPLANEDEFECTSINTHEWELDSOFRAILSLiLianxiuXiongXiaolanZhongDongmin(MetalsandChemistryResearchInstitute,ChinaAcademyofRailwaySciences,Beijing)AbstractTheplanedefectsinrailweldsandtheirdetectionaredescribed.Therelationshipbetweenechoheightandthepositionofaflawinpitch2catchmode,andthepropagationlawofacousticwavesandtheselectionoftheoffsetangleofaprobefortheinspectionofrailfilletinthecaseofusingsingleprobearemainlydiscussed.KeywordsRailWeldDefectProbeUltrasonicinspection,,,;,,,,,,,,,,11.11,,,,LL=2htgB=2Kh(1)K=tgBB1h,LBh,B,L,(h),L,L,,,L,,1,;2,K,,,K,,,93322820008NDTVol.22No.8Aug.2000©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2K,,1.2,,,,,,,,,,,x1,x2,,,[1],PP=GõSx1x2=GõSx(m-x)(2)mm=x1+x2xx1x2SG,,x1x2,,,(2)dPödx=0x=mö2,x1=x2,,,x1x2,;,x1x2,,13mm,B=37,K=1.18mm,40mm,H,176mm,,,H,,H,(2)13mmHömmödBödBHömmödBödB52712020.722302715020.0216027.32816519.9199022.1262,3,,,,3,,,,,,,[2],,()NN=sin-1(sinBsinWcos2H-cosBsin2H)(3)W,H,(3)3XOZ,O,O1,O2,OO1,O1O2(3)N=0,W=sin-1tg2HKKsinW=tg2H(4)(4),043:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.(XOZ),,WKH2K2K2.5,,,2W()KH6.3414.0418.4326.56.415.515.422.0222.02.55.26.012.311.317.5016.5,,,XOZ,,(4),,XOZnn=csin2H(5)cc1215mm3(1),,,,,,,,;,(2),,,,KH,W=sin-1(tg2HöK),,,1..:,1980.2..,1993,15(3):61-62:19992082092000200020006161862,28,18,CTXGB17925-1999CTX,()20003,2000200091113,:74501,:430074,:02728780170125405,:027287801267()143:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.