ASTM B548-2003(2009) Standard Test Method for Ultrasonic Inspection of Aluminum-Alloy Plate for Pressure Vessels《压力容器用铝合金板的超声波检验的标准试验方法》.pdf
《ASTM B548-2003(2009) Standard Test Method for Ultrasonic Inspection of Aluminum-Alloy Plate for Pressure Vessels《压力容器用铝合金板的超声波检验的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM B548-2003(2009) Standard Test Method for Ultrasonic Inspection of Aluminum-Alloy Plate for Pressure Vessels《压力容器用铝合金板的超声波检验的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B548 03 (Reapproved 2009)Standard Test Method forUltrasonic Inspection of Aluminum-Alloy Plate for PressureVessels1This standard is issued under the fixed designation B548; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers pulse-echo ultrasonic inspectionof aluminum-alloy plate of thickness equal to o
3、r greater than0.500 in. (12.7 mm) for use in the fabrication of pressurevessels. The ultrasonic test is employed to detect gross internaldiscontinuities oriented in a direction parallel to the rolledsurface such as cracks, ruptures, and laminations, and toprovide assurance that only plate that is fr
4、ee from rejectablediscontinuities is accepted for delivery.1.2 The inspection method and acceptance criteria includedin this standard shall be limited to plate of the followingaluminum alloys: 1060, 1100, 3003, Alclad 3003, 3004, Alclad3004, 5050, 5052, 5083, 5086, 5154, 5254, 5454, 5456, 5652,6061,
5、 and Alclad 6061.1.3 This test method applies only to ultrasonic tests usingpulsed longitudinal waves which are transmitted and receivedby a search unit containing either a single crystal or acombination of electrically interconnected multiple crystals.Ultrasonic tests employing either the through-t
6、ransmission orthe angle-beam techniques are not included.1.4 This test method shall be used when ultrasonic inspec-tion as prescribed herein is required by the contract, purchaseorder, or referenced plate specification.1.5 The values stated in inch-pound units are to be regardedas standard. The valu
7、es given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to esta
8、blish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Stand
9、ards:2E114 Practice for Ultrasonic Pulse-Echo Straight-Beam Ex-amination by the Contact MethodE214 Practice for Immersed Ultrasonic Testing by theReflection Method Using Pulsed Longitudinal Waves3E317 Practice for Evaluating Performance Characteristicsof Ultrasonic Pulse-Echo Testing Instruments and
10、 Systemswithout the Use of Electronic Measurement Instruments2.3 Other Standards:ASNT Recommended Practice for Nondestructive TestingPersonnel Qualification and CertificationUltrasonicTesting MethodSNT-TC-1A43. Summary of Method3.1 The plate is inspected ultrasonically by scanning onerolled surface
11、with a beam of pulsed longitudinal waves whichis oriented in a direction perpendicular to the entry surface ofthe plate. The ultrasound is transmitted into the plate either bythe direct contact, immersion, or liquid-column couplingmethod. During the scan, an indication representing the firstback ref
12、lection is observed on the A-scan screen of the testinstrument.3.2 When the test system sensitivity level is appropriatelyadjusted, a discontinuity is detected during the scan by notingan isolated indication associated with a loss of the first backreflection indication. The apparent size of the disc
13、ontinuity isdetermined by measuring the total area in the scanned entrysurface of the plate where the isolated indication and the lossof back reflection persist. The estimated discontinuity size andlocation are then compared with suitable acceptance criteria.NOTE 1Additional information describing u
14、ltrasonic tests by thedirect contact method and by the immersion method is available inPractices E114 and E214.1This test method is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is under the jurisdiction of Subcommittee B07.03 onAluminum Alloy Wrought Products.Current ed
15、ition approved Dec. 1, 2009. Published January 2010. Originallyapproved in 1971. Last previous edition approved in 2003 as B548 03. DOI:10.1520/B0548-03R09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of AST
16、MStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.4Available fromAmerican Society for Nondestructive Testing (ASNT), P.O. Box28518, 1711 Arlingate Ln., Columbus
17、, OH 43228-0518, http:/www.asnt.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Significance and Use4.1 A number of factors such as the condition of the entryand back surfaces of the plate, the inclination of the ultrasonicbea
18、m with respect to the entry surface, and the performancecharacteristics of the test system may cause either a reductionof isolated indications or a substantial loss of back reflectionand thereby could seriously impair the reliability of the testprocedure outlined in this standard.4.2 Accurate evalua
19、tions of discontinuity size also may belimited significantly by variations in beam characteristicswhich exist in most search units. For this reason, discontinuitysize as determined by the test procedure outlined in this methodis regarded as “apparent” or “estimated” in recognition of thelimited quan
20、titative value of the measurement.4.3 Because a large number of interacting variables in a testsystem can adversely influence the results of an ultrasonic test,the actual quantitative effects of detected discontinuities uponthe mechanical properties of the inspected plate are difficult toestablish.
21、Consequently, this ultrasonic inspection method isnot applicable as an exclusive indicator of the ultimate qualityand performance of pressure vessels but provides a reliablecontrol of plate quality to avoid failure during the formingprocess for fabrication of vessels.5. Apparatus5.1 Test InstrumentA
22、ny electronic device that producespulsed longitudinal waves and displays ultrasonic reflectionson an A-scan indicator when used with an appropriate searchunit is satisfactory. The instrument shall provide stable, linearamplification of received pulses at a selected test frequency andshall be free fr
23、om significant interface signal interference at therequired sensitivity level.5.2 Search UnitThe search unit recommended for thisstandard is the flat nonfocusing type, and contains a piezoelec-tric crystal which generates and receives longitudinal waves atthe rated frequency when connected to the te
24、st instrumentthrough a suitable coaxial cable. A dual-crystal search unitcontaining both a transmitting and a receiving crystal in onecontainer may be used provided the test instrument willaccommodate two-crystal operation and the resulting pulse-echo test is equivalent to that obtained with a searc
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