1、Specification forBare Electrodesand Rods forSurfacingAWS A5.21/A5.21M:2011An American National Standard550 N.W. LeJeune Road, Miami, FL 33126AWS A5.21/A5.21M:2011An American National StandardApproved by theAmerican National Standards InstituteDecember 23, 2010Specification for BareElectrodes and Rod
2、s for Surfacing5th EditionSupersedes AWS A5.21:2001Prepared by theAmerican Welding Society (AWS) A5 Committee on Filler Metals and Allied MaterialsUnder the Direction of theAWS Technical Activities CommitteeApproved by theAWS Board of DirectorsAbstractThis specification prescribes the requirements f
3、or classification of bare electrodes and rods for surfacing. Solid surfacingelectrodes and rods are classified on the basis of the composition of the material as manufactured. Metal cored and fluxcored composite (tubular) surfacing electrodes and rods are classified on the basis of the chemical comp
4、osition ofthe deposited weld metal. Tubular tungsten carbide bare rods are classified on the basis of the mesh range, quantity, andcomposition of the tungsten carbide granules. A guide is appended to the specification as a source of informationconcerning the characteristics and applications of the c
5、lassified electrodes.iiAWS A5.21/A5.21M:2011International Standard Book Number: 978-0-87171-787-0American Welding Society550 N.W. LeJeune Road, Miami, FL 33126 2011 by American Welding SocietyAll rights reservedPrinted in the United States of AmericaPhotocopy Rights. No portion of this standard may
6、be reproduced, stored in a retrieval system, or transmitted in anyform, including mechanical, photocopying, recording, or otherwise, without the prior written permission of the copyrightowner.Authorization to photocopy items for internal, personal, or educational classroom use only or the internal,
7、personal, oreducational classroom use only of specific clients is granted by the American Welding Society provided that the appropriatefee is paid to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, tel: (978) 750-8400; Internet:.iiiAWS A5.21/A5.21M:2011Statement on the Use of
8、American Welding Society StandardsAll standards (codes, specifications, recommended practices, methods, classifications, and guides) of the AmericanWelding Society (AWS) are voluntary consensus standards that have been developed in accordance with the rules of theAmerican National Standards Institut
9、e (ANSI). When AWS American National Standards are either incorporated in, ormade part of, documents that are included in federal or state laws and regulations, or the regulations of other govern-mental bodies, their provisions carry the full legal authority of the statute. In such cases, any change
10、s in those AWSstandards must be approved by the governmental body having statutory jurisdiction before they can become a part ofthose laws and regulations. In all cases, these standards carry the full legal authority of the contract or other documentthat invokes the AWS standards. Where this contrac
11、tual relationship exists, changes in or deviations from requirementsof an AWS standard must be by agreement between the contracting parties.AWS American National Standards are developed through a consensus standards development process that bringstogether volunteers representing varied viewpoints an
12、d interests to achieve consensus. While the AWS administers theprocess and establishes rules to promote fairness in the development of consensus, it does not independently test, evalu-ate, or verify the accuracy of any information or the soundness of any judgments contained in its standards.AWS disc
13、laims liability for any injury to persons or to property, or other damages of any nature whatsoever, whetherspecial, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, or relianceon this standard. AWS also makes no guarantee or warranty as to the
14、 accuracy or completeness of any informationpublished herein.In issuing and making this standard available, AWS is neither undertaking to render professional or other services for oron behalf of any person or entity, nor is AWS undertaking to perform any duty owed by any person or entity to someonee
15、lse. Anyone using these documents should rely on his or her own independent judgment or, as appropriate, seek theadvice of a competent professional in determining the exercise of reasonable care in any given circumstances. It isassumed that the use of this standard and its provisions are entrusted t
16、o appropriately qualified and competent personnel.This standard may be superseded by the issuance of new editions. Users should ensure that they have the latest edition.Publication of this standard does not authorize infringement of any patent or trade name. Users of this standard acceptany and all
17、liabilities for infringement of any patent or trade name items. AWS disclaims liability for the infringement ofany patent or product trade name resulting from the use of this standard.Finally, the AWS does not monitor, police, or enforce compliance with this standard, nor does it have the power to d
18、o so.On occasion, text, tables, or figures are printed incorrectly, constituting errata. Such errata, when discovered, are postedon the AWS web page (www.aws.org).Official interpretations of any of the technical requirements of this standard may only be obtained by sending a request,in writing, to t
19、he appropriate technical committee. Such requests should be addressed to the American Welding Society,Attention: Managing Director, Technical Services Division, 550 N.W. LeJeune Road, Miami, FL 33126 (see Annex B).With regard to technical inquiries made concerning AWS standards, oral opinions on AWS
20、 standards may be rendered.These opinions are offered solely as a convenience to users of this standard, and they do not constitute professionaladvice. Such opinions represent only the personal opinions of the particular individuals giving them. These individualsdo not speak on behalf of AWS, nor do
21、 these oral opinions constitute official or unofficial opinions or interpretations ofAWS. In addition, oral opinions are informal and should not be used as a substitute for an official interpretation.This standard is subject to revision at any time by the AWS A5 Committee on Filler Metals and Allied
22、 Materials. It mustbe reviewed every five years, and if not revised, it must be either reaffirmed or withdrawn. Comments (recommenda-tions, additions, or deletions) and any pertinent data that may be of use in improving this standard are requiredand should be addressed to AWS Headquarters. Such comm
23、ents will receive careful consideration by the AWS A5Committee on Filler Metals and Allied Materials and the author of the comments will be informed of the Committeesresponse to the comments. Guests are invited to attend all meetings of the AWS A5 Committee on Filler Metals andAllied Materials to ex
24、press their comments verbally. Procedures for appeal of an adverse decision concerning all suchcomments are provided in the Rules of Operation of the Technical Activities Committee. A copy of these Rules can beobtained from the American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.This pa
25、ge is intentionally blank.ivAWS A5.21/A5.21M:2011vAWS A5.21/A5.21M:2011PersonnelAWS A5 Committee on Filler Metals and Allied MaterialsJ. S. Lee, Chair ChevronH. D. Wehr, 1st Vice Chair Arcos Industries, LLCJ. J. DeLoach, Jr., 2nd Vice Chair Naval Surface Warfare CenterR. K. Gupta, Secretary American
26、 Welding SocietyT. Anderson ESAB Welding therefore each system must be used indepen-dently of the other, without combining values in any way. In selecting rational metric units, AWS A1.1, Metric PracticeGuide for the Welding Industry, and ISO 544 Welding consumables Technical delivery conditions for
27、 welding fillermaterials Type of product, dimensions, tolerances and marking, are used where suitable. Tables and figures make useof both U.S. Customary and SI Units, which, with the application of the specified tolerances, provides for interchange-ability of products in both the U.S. Customary and
28、SI Units.This newly metricated edition has a new “Rounding-off Procedure.”AWS F3.2, Ventilation Guide for Weld Fume, hasbeen referenced in A5.2. Detailed safety information in the annex has been replaced by reference to the AWS Safety andHealth Fact Sheets. Detailed information about standard sizes
29、and packaging has been replaced with reference to AWSA5.02/A5.02M. Added subclause 2(d) in A2.5 regarding requesting of new classifications. Significant changes such asthese are shown in Italic font.Historical background for the document is as follows:ANSI/AWS A5.21-70 Specification for Composite Su
30、rfacing Welding Rods and ElectrodesANSI W3.21-73ANSI/AWS A5.21-80 Specification for Composite Surfacing Welding Rods and ElectrodesAWS A5.21:2001 Specification for Bare Electrodes and Rods for SurfacingComments and suggestions for the improvement of this standard are welcome. They should be sent to
31、the Secretary,AWS A5 Committee on Filler Metals and Allied Materials, American Welding Society, 550 N.W. LeJeune Road, Miami,FL 33126.This page is intentionally blank.viiiAWS A5.21/A5.21M:2011ixAWS A5.21/A5.21M:2011Table of ContentsPage No.Personnel vForeword.viiList of Figures.xList of Tables.x1. S
32、cope.12. Referenced Documents13. Classification24. Acceptance .25. Certification .26. Rounding-Off Procedure 27. Summary of Tests 77.1 Solid Electrodes or Rods77.2 Metal Cored and Flux Cored Composite (Tubular) Electrodes and Rods .77.3 Tungsten Carbide Rods 78. Retest 99. Chemical Composition Requi
33、rements.910. Method of Manufacture1011. Standard Sizes and Lengths .1012. Finish and Uniformity.1013. Standard Package Forms1014. Winding Requirements .1015. Filler Metal Identification.1016. Packaging .1217. Marking of Packages.12Annex A (Informative)Guide to AWS Specification for Bare Electrodes a
34、nd Rods for Surfacing .13Annex B (Informative)Guidelines for the Preparation of Technical Inquiries 25AWS Filler Metal Specifications by Material and Welding Process 27AWS Filler Metal Specifications and Related Documents.29xAWS A5.21/A5.21M:2011List of TablesTable Page No.1 Solid and Cored Iron Bas
35、e Electrodes and RodsChemical Requirements32 Solid Cobalt and Nickel Base Bare Electrodes and RodsChemical Composition Requirements.43 Metal Cored and Flux Cored Composite Cobalt and Nickel-Base Bare Electrodes and RodsChemical Composition Requirements 54 Solid and Cored Copper Base Electrodes and R
36、odsChemical Composition Requirements.65 Mesh Size and Quantity of Tungsten Carbide (WC) Granules in the Core of TungstenCarbide Bare Rods and Electrodes .76 Chemical Composition Requirements for Tungsten Carbide Granules77 Standard Sizes of Bare Electrodes and Rods Using Solid Drawn or Composite (Tu
37、bular) Wire.118 Standard Sizes for Cast Electrodes and Rods .119 Standard Sizes for Tungsten Carbide (WC) Rods 12A.1 Discontinued and Transferred Electrode and Rod Classifications22List of FiguresFigure Page No.1 Pad for Chemical Analysis of Undiluted Weld Metal 8AWS A5.21/A5.21M:201111. Scope1.1 Th
38、is specification prescribes the requirements for the classification of bare electrodes and rods for surfacing. Thespecification does not provide for classification of electrode-flux combinations for submerged arc welding.1.2 Safety and health issues and concerns are beyond the scope of this standard
39、 and, therefore, are not fully addressedherein. Some safety and health information can be found in the nonmandatory annex Clauses A5 and A10. Safety andhealth information is available from other sources, including, but not limited to, ANSI Z49.1, Safety in Welding, Cutting,and Allied Processes,1and
40、applicable federal and state regulations.1.3 This specification makes use of both U.S. Customary Units and the International System of Units (SI). The measure-ments are not exact equivalents; therefore, each system must be used independently of the other without combining inany way when referring to
41、 material. The specification with the designation A5.21 uses U.S. Customary Units. The speci-fication A5.21M uses SI Units. The latter are shown within brackets or in appropriate columns in tables and figures.Standard dimensions based on either system may be used for sizing of filler metal or packag
42、ing or both under A5.21 orA5.21M specifications.2. Referenced DocumentsThe following documents are referenced within this publication. For undated references, the latest edition of the referencedstandard shall apply. For dated references, subsequent amendments to, or revisions of, any of these publi
43、cations do not apply.2.1 AWS Standards2AWS A3.0M/A3.0, Standard Welding Terms and DefinitionsAWS A5.01M/A5.01 (ISO 14344), Procurement Guidelines for ConsumablesWelding and Allied ProcessesFlux andGas Shielded Electrical Welding ProcessesAWS A5.02/A5.02M, Specification for Filler Metal Standard Size
44、s, Packaging, and Physical AttributesAWS F3.2, Ventilation Guide for Weld Fume2.2 ANSI StandardsANSI Z49.1, Safety in Welding, Cutting, and Allied Processes2.3 ASTM Standards3ASTM E 29, Standard Practice of Using Significant Digits in Test Data to Determine Conformance with Specifications1ANSI Z49.1
45、 is published by American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.2AWS standards are published by American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.3ASTM standards are published by ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.Specificatio
46、n for BareElectrodes and Rods for SurfacingAWS A5.21/A5.21M:20112ASTM A36/A36M, Standard Specification for Carbon Structural SteelASTM B 214, Standard Test Method for Sieve Analysis of Metal PowdersASTM A 285/A 285M, Standard Specification for Pressure Vessel Plates, Carbon Steel, Low- and Intermedi
47、ate-TensileStrength2.4 ISO Standards4ISO 544, Welding Consumables Technical delivery conditions for welding filler materials Type of product, dimensions,tolerances and markingISO 80000-1, Quantities and units Part 1: General3. Classification3.1 The surfacing electrodes and rods covered by this speci
48、fication are classified according to the following:3.1.1 Solid surfacing electrodes and rods are classified on the basis of the composition of the material as manufactured(or the stock from which it was made) (see Tables 1, 2, and 4).3.1.2 Metal cored and flux cored composite (tubular) surfacing ele
49、ctrodes and rods, except for tungsten carbide rods,are classified on the basis of the composition of an undiluted weld deposit, as shown in Tables 1, 3, and 4.3.1.3 Tubular tungsten carbide surfacing rods are classified on the basis of the mesh range, quantity, and compositionof the tungsten carbide granules, as shown in Tables 5 and 6.3.2 Material classified under one classification shall not be classified under any other classification in this specification.4. AcceptanceAcceptance5of the welding electrodes and rods shall be in accordance with the provisions of AWS A5.
