AWS A5.21/A5.21M:2011

An American National Standard

Specification for Bare Electrodes and Rods for Surfacing

AWS A5.21/A5.21M:2011

An American National Standard

Approved by the American National Standards Institute

December 23, 2010

Specification for Bare Electrodes and Rods for Surfacing

5th Edition

Supersedes AWS A5.21:2001

Prepared by the American Welding Society (AWS) A5 Committee on Filler Metals and Allied Materials

Under the Direction of the AWS Technical Activities Committee

Approved by the AWS Board of Directors

Abstract

This specification prescribes the requirements for classification of bare electrodes and rods for surfacing. Solid surfacing electrodes and rods are classified on the basis of the composition of the material as manufactured. Metal cored and flux cored composite (tubular) surfacing electrodes and rods are classified on the basis of the chemical composition of the deposited weld metal. Tubular tungsten carbide bare rods are classified on the basis of the mesh range, quantity, and composition of the tungsten carbide granules. A guide is appended to the specification as a source of information concerning the characteristics and applications of the classified electrodes.

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© 2011 by American Welding Society

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Statement on the Use of American Welding Society Standards

All standards (codes, specifications, recommended practices, methods, classifications, and guides) of the American Welding Society (AWS) are voluntary consensus standards that have been developed in accordance with the rules of the American National Standards Institute (ANSI). When AWS American National Standards are either incorporated in, or made 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 changes in those AWS standards must be approved by the governmental body having statutory jurisdiction before they can become a part of those laws and regulations. In all cases, these standards carry the full legal authority of the contract or other document that invokes the AWS standards. Where this contractual relationship exists, changes in or deviations from requirements of an AWS standard must be by agreement between the contracting parties.

AWS American National Standards are developed through a consensus standards development process that brings together volunteers representing varied viewpoints and interests to achieve consensus. While the AWS administers the process 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 disclaims liability for any injury to persons or to property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, or reliance on this standard. AWS also makes no guarantee or warranty as to the accuracy or completeness of any information published herein.

In issuing and making this standard available, AWS is neither undertaking to render professional or other services for or on behalf of any person or entity, nor is AWS undertaking to perform any duty owed by any person or entity to someone else. Anyone using these documents should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. It is assumed that the use of this standard and its provisions are entrusted to 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 accept any and all liabilities for infringement of any patent or trade name items. AWS disclaims liability for the infringement of any 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 do so.

On occasion, text, tables, or figures are printed incorrectly, constituting errata. Such errata, when discovered, are posted on 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 the 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 standards may be rendered. These opinions are offered solely as a convenience to users of this standard, and they do not constitute professional advice. Such opinions represent only the personal opinions of the particular individuals giving them. These individuals do not speak on behalf of AWS, nor do these oral opinions constitute official or unofficial opinions or interpretations of AWS. 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 Materials. It must be 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 required and should be addressed to AWS Headquarters. Such comments will receive careful consideration by the AWS A5 Committee on Filler Metals and Allied Materials and the author of the comments will be informed of the Committee’s response to the comments. Guests are invited to attend all meetings of the AWS A5 Committee on Filler Metals and Allied Materials to express their comments verbally. Procedures for appeal of an adverse decision concerning all such comments are provided in the Rules of Operation of the Technical Activities Committee. A copy of these Rules can be obtained from the American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.

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Personnel

AWS A5 Committee on Filler Metals and Allied Materials

J. S. Lee, Chair Chevron

H. D. Wehr, 1st Vice Chair Arcos Industries, LLC

J. J. DeLoach, Jr., 2nd Vice Chair Naval Surface Warfare Center

R. K. Gupta, Secretary American Welding Society

T. Anderson ESAB Welding & Cutting Products

J. M. Blackburn Naval Sea Systems Command

J. C. Bundy Hobart Brothers Company

D. D. Crockett The Lincoln Electric Company

R. V. Decker Weldstar

D. A. DelSignore Consultant

J. DeVito ESAB Welding & Cutting Products

H. W. Ebert Consultant

D. M. Fedor The Lincoln Electric Company

J. G. Feldstein Foster Wheeler North America

S. E. Ferree ESAB Welding & Cutting Products

D. A. Fink The Lincoln Electric Company

G. L. Franke Naval Surface Warfare Center

R. D. Fuchs Böhler Welding Group USA, Incorporated

1. M. Henson J. W. Harris Company, Incorporated

2. D. Kiser Special Metals

P. J. Konkol Concurrent Technologies Corporation

1. J. Kotecki Damian Kotecki Welding Consultants

   1. Kvidahl Northrop Grumman Ship Systems

      1. Y. Lau Canadian Welding Bureau

         T. Melfi The Lincoln Electric Company

         1. Menon Stoody Company

   2. T. Merlo RevWires LLC

B. Mosier Polymet Corporation

A. K. Mukherjee Siemens Power Generation Incorporated

T. C. Myers American Bureau of Shipping

C. L. Null Consultant

K. C. Pruden Hydril Company

1. D. Reynolds, Jr. Consultant

K. Roossinck Northrop Grumman Ship Systems

P. K. Salvesen Det Norske Veritas (DNV)

K. Sampath Consultant

W. S. Severance ESAB Welding & Cutting Products

M. J. Sullivan NASSCO—National Steel & Shipbuilding

R. Sutherlin ATI Wah Chang

R. A. Swain Euroweld, Limited

K. P. Thornberry Care Medical, Incorporated

M. D. Tumuluru U.S. Steel Corporation

H. J. White HAYNES International

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Advisors to the AWS A5 Committee on Filler Metal and Allied Material

R. L. Bateman Electromanufacturas, S. A.

J. E. Beckham Chrysler LLC

R. A. Daemen Consultant

C. E. Fuerstenau Lucas-Milhaupt, Incorporated

J. P. Hunt Consultant

S. Imaoka Kobe Steel Limited

W. A. Marttila Chrysler LLC

D. R. Miller ABS Americas

M. P. Parekh Consultant

M. A. Quintana The Lincoln Electric Company

E. S. Surian National University of Lomas de Zamora

AWS A5G Subcommittee on Hardfacing Filler Metals

R. Menon, Chair Stoody Company

1. K. Gupta, Secretary American Welding Society

   F. Broshjeit Farrel Corporation

   J. Dezelle Kennametal Energy Mining

   S. P. Iyer Weartech International, Incorporated

   W. E. Layo Midalloy

   J. G. Postle Postle Industries, Incorporated

   V. B. Rajan The Lincoln Electric Company

   1. P. Yelistratov Caterpillar, Incorporated

Advisor to the AWS A5G Subcommittee on Hardfacing Filler Metals

J. B. Wu Deloro Stellite Group

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Foreword

This foreword is not part of AWS A5.21/A5.21M:2011, Specification for Bare Electrodes and Rods for Surfacing, but is included for informational purposes only.

The method of manufacture of the core wire was the prime consideration for earlier revisions of AWS A5.21. All elec- trodes and rods included composite (tubular) cores. Both bare and covered electrodes were included in the same specifi- cation.

The previous revision of A5.21:2001, like that of A5.13: 2000, departed from the earlier format by eliminating the method of manufacture of the core wire as a factor for classification. All electrodes and rods now classified in accor- dance with A5.21:2001 are uncoated. Covered electrodes previously included, were then classified in accordance with the revision of A5.13:2000. Some solid bare electrodes and rods previously classified in accordance with A5.13-80 had been incorporated into the previously revised A5.21:2001.

This document is the first of the A5.21 specifications which makes use of both U.S. Customary Units and the Interna- tional System of Units (SI). The measurements are not exact equivalents; 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 Practice Guide for the Welding Industry, and ISO 544 Welding consumables — Technical delivery conditions for welding filler materials — Type of product, dimensions, tolerances and marking, are used where suitable. Tables and figures make use of 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 SI Units.

This newly metricated edition has a new “Rounding-off Procedure.”AWS F3.2, Ventilation Guide for Weld Fume, has been referenced in A5.2. Detailed safety information in the annex has been replaced by reference to the AWS Safety and Health Fact Sheets. Detailed information about standard sizes and packaging has been replaced with reference to AWS A5.02/A5.02M. Added subclause 2(d) in A2.5 regarding requesting of new classifications. Significant changes such as these are shown in Italic font.

Historical background for the document is as follows:

ANSI/AWS A5.21-70 Specification for Composite Surfacing Welding Rods and Electrodes

ANSI W3.21-73

ANSI/AWS A5.21-80 Specification for Composite Surfacing Welding Rods and Electrodes

AWS A5.21:2001 Specification for Bare Electrodes and Rods for Surfacing

Comments and suggestions for the improvement of this standard are welcome. They should be sent to the Secretary, AWS A5 Committee on Filler Metals and Allied Materials, American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.

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Table of Contents

Page No.

Personnel v

Foreword vii

List of Figures x

List of Tables x

1. Scope 1

2. Referenced Documents 1

3. Classification 2

4. Acceptance 2

5. Certification 2

6. Rounding-Off Procedure 2

7. Summary of Tests 7

   1. Solid Electrodes or Rods 7

   2. Metal Cored and Flux Cored Composite (Tubular) Electrodes and Rods 7

   3. Tungsten Carbide Rods 7

8. Retest 9

9. Chemical Composition Requirements 9

10. Method of Manufacture 10

11. Standard Sizes and Lengths 10

12. Finish and Uniformity 10

13. Standard Package Forms 10

14. Winding Requirements 10

15. Filler Metal Identification 10

16. Packaging 12

17. Marking of Packages 12

Annex A (Informative)—Guide to AWS Specification for Bare Electrodes and Rods for Surfacing 13

Annex B (Informative)—Guidelines for the Preparation of Technical Inquiries 25

AWS Filler Metal Specifications by Material and Welding Process 27

AWS Filler Metal Specifications and Related Documents 29

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List of Tables

Table Page No.

1. Solid and Cored Iron Base Electrodes and Rods—Chemical Requirements 3

2. Solid Cobalt and Nickel Base Bare Electrodes and Rods—Chemical Composition Requirements 4

3. Metal Cored and Flux Cored Composite Cobalt and Nickel-Base Bare Electrodes and Rods—

   Chemical Composition Requirements 5

4. Solid and Cored Copper Base Electrodes and Rods—Chemical Composition Requirements 6

5. Mesh Size and Quantity of Tungsten Carbide (WC) Granules in the Core of Tungsten

   Carbide Bare Rods and Electrodes 7

6. Chemical Composition Requirements for Tungsten Carbide Granules 7

7. Standard Sizes of Bare Electrodes and Rods Using Solid Drawn or Composite (Tubular) Wire 11

8. Standard Sizes for Cast Electrodes and Rods 11

9. Standard Sizes for Tungsten Carbide (WC) Rods 12

A.1 Discontinued and Transferred Electrode and Rod Classifications 22

List of Figures

Figure Page No.

1 Pad for Chemical Analysis of Undiluted Weld Metal 8

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Specification for Bare Electrodes and Rods for Surfacing

1. Scope

   1. This specification prescribes the requirements for the classification of bare electrodes and rods for surfacing. The specification does not provide for classification of electrode-flux combinations for submerged arc welding.

   2. Safety and health issues and concerns are beyond the scope of this standard and, therefore, are not fully addressed herein. Some safety and health information can be found in the nonmandatory annex Clauses A5 and A10. Safety and health information is available from other sources, including, but not limited to, ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes,1 and applicable federal and state regulations.

   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 in any way when referring to 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 packaging or both under A5.21 or A5.21M specifications.

      
      

2. Referenced Documents

   The following documents are referenced within this publication. For undated references, the latest edition of the referenced standard shall apply. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply.

   1. AWS Standards2

      AWS A3.0M/A3.0, Standard Welding Terms and Definitions

      AWS A5.01M/A5.01 (ISO 14344), Procurement Guidelines for Consumables—Welding and Allied Processes—Flux and Gas Shielded Electrical Welding Processes

      AWS A5.02/A5.02M, Specification for Filler Metal Standard Sizes, Packaging, and Physical Attributes

      AWS F3.2, Ventilation Guide for Weld Fume

   2. ANSI Standards

      ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes

   3. ASTM Standards3

ASTM E 29, Standard Practice of Using Significant Digits in Test Data to Determine Conformance with Specifications

1 ANSI Z49.1 is published by American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.

2 AWS standards are published by American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.

3 ASTM standards are published by ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.

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