【英文标准名称】:StandardPracticeforMechanizedUltrasonicTestingofGirthWeldsUsingZonalDiscriminationwithFocusedSearchUnits
【原文标准名称】:使用带聚焦检测装置的带状识别机械化超声检验环型焊缝的标准实施规范
【标准号】:ASTME1961-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E07.06
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:触点;试验方法;超声检验;超声波学;单位;焊接;焊缝
【英文主题词】:contactfocusedsearchunits;girthwelds;mechanizedultrasonics
【摘要】:Thispracticeisintendedprimarilyforthemechanizedultrasonicexaminationofpipegirthweldsusedintheconstructionofgasandoilpipelines.Thispractice,withappropriatemodificationsduetochangesinweldprofile,mayalsobeusedtoexaminerepairedwelds.ManualtechniquessuchasdescribedinPracticeE164mayalsobeusedtoexamineproductionorrepairedwelds.Thispractice,withappropriatemodifications,mayalsobeusedtoexamineotherformsofbuttweldsincludinglongseams.Techniquesusedaretobebasedonzonaldiscriminationwherebytheweldisdividedintoapproximatelyequalverticalexaminationsections(zones)eachbeingassessedbyapairofultrasonicsearchunits.SeeFig.1fortypicalzones.Thicknessesofmaterialexaminedarenormally7to25mm[0.28to1.00in.]andpipediameters15cm[6.0in.]andgreaterbutthisstandardmayapplytootherthicknessesanddiametersifthetechniquescanbeproventoprovidetherequiredzonaldiscrimination.Examinationzonesaretypically2to3mm[0.08to0.12in.]inheight.Formostapplicationsthiswillrequiretheuseofcontactfocusedsearchunitstoavoidinterferingsignalsoriginatingfromoff-axisgeometricreflectorsandtoavoidexcessiveoverlapwithadjacentzones.FIG.1SchematicRepresentationofWeldZonesandDiscontinuities1.1Thispracticecoverstherequirementsformechanizedultrasonicexaminationofgirthwelds.Evaluationisbasedupontheresultsofmechanizedultrasonicexamination.AcceptancecriteriaarebaseduponflawlimitsdefinedbyanEngineeringCriticalAssessment(ECA)orotheraccept/rejectcriteriadefinedbytheContractingAgency.1.2Thispracticeshallbeapplicabletothedevelopmentofanexaminationprocedureagreeduponbetweentheusersofthispractice.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninbracketsareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H26;J33
【国际标准分类号】:
【页数】:12P.;A4
【正文语种】: