1、AN AMERICAN NATIONAL STANDARD ASME B16.25-2012(Revision of ASME B16.25-2007)Buttwelding EndsCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright ASME International Provided by IHS under licen
2、se with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16.25-2012(Revision of ASME B16.25-2007)ButtweldingEndsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016 USACopyright ASME International Provided by IHS under license with ASME Not fo
3、r ResaleNo reproduction or networking permitted without license from IHS-,-,-Date of Issuance:December 20,2012The next edition of this Standard is scheduled for publication in 2017.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Periodically c
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12、ise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license wi
13、th ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B16 Committee.viSummary of Changes.vii1Scope.12Transition Contours.13Welding Bevel Design.24Preparation of Inside Diameter of Welding End.25Toleranc
14、es.3Figures1Maximum Envelope for Welding End Transitions.42Bevels for Wall Thickness Over 3 mm(0.12 in.)to 22 mm(0.88 in.),Inclusive.53Weld Bevel Details for Wall Thickness Over 22 mm(0.88 in.).64Weld Bevel Details for GTAW Root Pass Wall Thickness Over3 mm(0.12 in.)to 10 mm(0.38 in.),Inclusive.75We
15、ld Bevel Details for GTAW Root Pass Wall Thickness Over10 mm(0.38 in.)to 25 mm(1.0 in.),Inclusive.76Weld Bevel Details for GTAW Root Pass Wall Thickness Over25 mm(1.0 in.).8Table1Dimensions of Welding Ends.9Mandatory AppendicesIInch Table.13IIReferences.18Nonmandatory AppendixAQuality System Program
16、.19iiiCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOREWORDIn July 1953,the American Welding Society presented a proposal on Welding End Preparationto Sectional Committee B16 of the American Standards Association(ASA),with the recommenda-tion that it be considered as a candidate for an American Standard.The proposal was expandedto include welding preparation for flanges and valves covered b
