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AWS A5.20/A5.20M:2005 (R2015) Specification for Carbon Steel Electrodes for Flux Cored Arc Welding
standard by American Welding Society, 01/12/2005
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AWS A5.20/A5.20M:2005 (R2015)
An American National Standard
Approved by the American National Standards Institute
July 28, 2015
Supersedes ANSI/AWS A5.20-95
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
This specification prescribes the requirements for classification of carbon steel electrodes for flux cored arc welding. The requirements include chemical composition and mechanical properties of the weld metal and certain usability char- acteristics. The AWS A5.20/A5.20M specification also includes optional, supplemental designators for improved tough- ness and diffusible hydrogen and to indicate conformance to special mechanical property requirements when the weld metal is deposited using both low heat input, fast cooling rate and high heat input, slow cooling rate procedures. Addi- tional requirements are included for standard sizes, marking, manufacturing and packaging. A guide is appended to the specification as a source of information concerning the classification system employed and the intended use of carbon steel flux cored electrodes.
This specification makes use of both U.S. Customary Units and the International System of Units (SI). Since these are not equivalent, each system must be used independently of the other.
AWS A5.20/A5.20M:2005 (R2015)
ISBN: 978-0-87171-868-6
© 2015 by American Welding Society
All rights reserved Printed in the United States of America
Photocopy Rights. No portion of this standard may be reproduced, stored in a retrieval system, or transmitted in any form, including mechanical, photocopying, recording, or otherwise, without the prior written permission of the copyright owner.
Authorization to photocopy items for internal, personal, or educational classroom use only or the internal, personal, or educational classroom use only of specific clients is granted by the American Welding Society provided that the appropriate fee is paid to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, tel: (978) 750-8400; Internet:
<www.copyright.com>.
AWS A5.20/A5.20M:2005 (R2015)
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 governmen- tal bodies, their provisions carry the full legal authority of the statute. In such cases, any changes in those AWS stan- dards 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.
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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, 8669 NW 36 St, # 130, Miami, FL 33166.
AWS A5.20/A5.20M:2005 (R2015)
AWS A5 Committee on Filler Metals and Allied Materials
H. D. Wehr, Chair Arcos Industries, LLC
J. J. DeLoach, Jr., 1st Vice Chair Naval Surface Warfare Center
R. D. Fuchs, 2nd Vice Chair Böhler Welding Group USA, Incorporated
R. K. Gupta, Secretary American Welding Society
T. Anderson ITW Welding North America
J. C. Bundy Hobart Brothers Company
J. L. Caron Haynes International, Incorporated
D. D. Crockett Consultant
R. V. Decker Weldstar
D. M. Fedor The Lincoln Electric Company
J. G. Feldstein Foster Wheeler North America
D. A. Fink The Lincoln Electric Company
G. L. Franke Consultant
M. Henson J. W. Harris Company, Incorporated
D. Kiser Consultant
P. J. Konkol Concurrent Technologies Corporation
D. J. Kotecki Damian Kotecki Welding Consultants
G. Kvidahl Ingalls Shipbuilding
Y. Lau Canadian Welding Bureau
J. S. Lee Chevron
R. Logan Babcock & Wilcox
T. Melfi The Lincoln Electric Company
M. T. Merlo Welding Development Consulting
M. Merlo-Joseph Apeks Supercritical
B. Mosier Polymet Corporation
K. Mukherjee Siemens Power Generation, Incorporated
T. C. Myers Lutech Resources
A. Pletcher Select-Arc
D. Praster NuWeld, Incorporated
C. Pruden BP Americas
K. Roossinck Ingalls Shipbuilding
P. K. Salvesen Det Norske Veritas (DNV)
K. Sampath Chart Industries
F. A. Schweighardt Air Liquide Industrial US LP
W. S. Severance ESAB Welding and Cutting Products
M. F. Sinfield Naval Surface Warfare Center
D. Singh GE Oil & Gas
P. E. Staunton Shell EDG
C. Sutherlin ATI Wah Chang
A. Swain Euroweld, Limited
J. Zhang Indalco Alloys, Incorporated
AWS A5.20/A5.20M:2005 (R2015)
Advisors to the AWS A5 Committee on Filler Metal and Allied Material
D. R. Bajek Chicago Bridge and Iron
J. E. Beckham FCA Fiat Chrysler Automobiles
M. Blackburn Naval Sea Systems Command
P. Campion Carpenter Technology
T. A. Davenport PRL Industries
D. A. DelSignore Consultant
J. DeVito Consultant
W. D. England ITW Welding North America
S. E. Ferree Consultant
R. J. Fox Hobart Brothers Company
E. Fuerstenau Lucas-Milhaupt, Incorporated
S. Imaoka Kobe Steel Limited
S. J. Knostman Hobart Brothers
A. Marttila WAMcom Consulting, LLC
R. Menon Victor Technologies
A. Miller Kennametal, Incorporated
M. A. Quintana The Lincoln Electric Company
D. Sparkowich Nerac, Inc orporated
M. J. Sullivan NASSCO—National Steel & Shipbuilding
M. D. Tumuluru U.S. Steel
H. J. White CB&I
AWS A5M Subcommittee on Carbon and Low-Alloy Steel Electrodes for Flux Cored Arc Welding and Metal Cored Electrodes for Gas Metal Arc Welding
D. Crockett, Chair Consultant
M. T. Merlo, Vice Chair Welding Development Consulting
K. Gupta, Secretary American Welding Society
J. C. Bundy Hobart Brothers Company
J. DeLoach, Jr. Naval Surface Warfare Center
G. L. Franke Consultant
D. W. Haynie Kobelco Welding of America, Incorporated
S. R. Jana Kiswel Limited
L. Kuiper Euroweld, Limited
Y. Lau Canadian Welding Bureau
M. Merlo-Joseph Apeks Supercritical
T. C. Myers Lutech Resources
J. S. Ogborn The Lincoln Electric Company
B. A. Pletcher Select-Arc
M. F. Sinfield Naval Surface Warfare Center
R. B. Smith Consultant
R. A. Swain Euroweld, Limited
Advisors to the AWS A5M Subcommittee on Carbon and Low Alloy Steel Electrodes for Flux Cored Arc Welding and Metal Cored Electrodes for Gas Metal Arc Welding
J. E. Campbell WeldTech Solutions Corporation
D. D. Childs Mark Steel Corporation
S. E. Ferree Consultant
K. K. Gupta Westinghouse Electric Corporation
S. Imaoka Kobe Steel Limited
W. E. Layo Midalloy
D. R. Miller ABS
M. P. Parekh Consultant
M. A. Quintana The Lincoln Electric Company
H. D. Wehr Arcos Industries, LLC
AWS A5.20/A5.20M:2005 (R2015)
AWS A5 Committee on Filler Metals and Allied Materials
D. A. Fink, Chair The Lincoln Electric Company
J. S. Lee, 1st Vice Chair Chicago Bridge & Iron Company
H. D. Wehr, 2nd Vice Chair Arcos Industries LLC
R. K. Gupta, Secretary American Welding Society
*R. L. Bateman Electromanufacturas S A
J. M. Blackburn Naval Surface Warfare Center
**B. S. Blum Consultant
R. S. Brown Consultant
J. C. Bundy ITW Hobart Brothers
R. J. Christoffel Consultant
*G. Crisi Universidade Presbiteriana
D. D. Crockett The Lincoln Electric Company
*R. A. Daemen Consultant
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 Energy Corporation
S. E. Ferree ESAB Welding & Cutting Products
***G. L. Franke Consultant
R. D. Fuchs Böhler Thyssen Welding USA, Incorporated
C. E. Fuerstenau Lucas-Milhaupt, Incorporated
J. A. Henning Consultant
*J. P. Hunt Consultant
M. Q. Johnson Los Alamos National Laboratory
S. D. Kiser Special Metals
P. J. Konkol Concurrent Technologies Corporation
D. J. Kotecki The Lincoln Electric Company
***L. G. Kvidahl Northrop Grumman Ship Systems
A. S. Laurenson Consultant
K. F. Longden Canadian Welding Bureau
W. A. Marttila Daimler-Chrysler Corporation
R. Menon Stoody Company
M. T. Merlo Welding Development Consulting
D. R. Miller ABS Americas
*B. Mosier Polymet Corporation
C. L. Null NAVSEA
M. P. Parekh Consultant
*D. Park Consultant
L. Peaslee Wall Colmonoy Corporation
*M. A. Quintana The Lincoln Electric Company
D. Reynolds, Jr. Consultant
*Advisor
**Deceased
***Special Contributor
AWS A5.20/A5.20M:2005 (R2015)
AWS A5 Committee on Filler Metals and Allied Materials (Continued)
P. K. Salvesen Det Norske Veritas (DNV)
K. Sampath Consultant
W. S. Severance ESAB Welding & Cutting Products
*E. R. Stevens Stevens Welding Consulting
M. J. Sullivan NASSCO—National Steel and Shipbuilding
*E. S. Surian Air Liquide Argentina S.A.
R.C. Sutherlin Wah Chang
R. A. Swain Euroweld, Ltd.
R. D. Thomas, Jr. R. D. Thomas and Company
P. Thornberry J. W. Harris Company, Incorporated
*S. Tsutsumi Kobe Steel Ltd.
T. Vernam AlcoTec Wire Company
*F. J. Winsor Consultant
AWS A5M Subcommittee on Carbon and Low Alloy Steel Electrodes for Flux Cored Arc Welding
D. D. Crockett, Chair The Lincoln Electric Company
M. T. Merlo, 1st Vice Chair Welding Development Consulting
R. K. Gupta, Secretary American Welding Society
J. C. Bundy ITW Hobart Brothers
J. E. Campbell WeldTech Solutions Corporation
D. D. Childs Mark Steel Corporation
L. A. Craig ABB-CE
J. J. DeLoach, Jr. Naval Surface Warfare Center
S. E. Ferree EASB Welding & Cutting Products
G. L. Franke Consultant
*K. K. Gupta Westinghouse Electric Corporation
D. Haynie Kobelco Welding of America, Incorporated
M. Q. Johnson Los Alamos National Laboratory
W. E. Layo Midalloy
K. F. Longden Canadian Welding Bureau
R. Menon Stoody Company
D. R. Miller ABS Americas
*M. P. Parekh Consultant
Marie Quintana The Lincoln Electric Company Lea Roberts CWB Group
R. A. Swain Euroweld, Ltd.
R. D. Thomas, Jr. R. D. Thomas & Company
*S. Tsutsumi Kobe Steel, Ltd.
H. D. Wehr Arcos Industries LLC
* Advisor
AWS A5.20/A5.20M:2005 (R2015)
This foreword is not part of AWS A5.20/A5.20M:2005 (R2015), Specification for Carbon Steel Electrodes for Flux Cored Arc Welding, but is intended for informational purposes only.)
This document is the first of the A5.20 specifications which uses both U.S. Customary Units and the International Sys- tem of Units (SI) throughout. 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 554, Welding consumables—Technical delivery conditions for welding filler metals—Type of product, dimensions, tolerances and markings, 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 interchangeabil- ity of products in both the U.S. Customary and SI Units.
The current document is the third revision of the initial joint ASTM/AWS document issued in 1969. Since it was devel- oped by a subcommittee of the AWS Committee on Filler Metals and Allied Materials, the use of flux cored electrodes has been stimulated by developments in electrode manufacturing technology that have permitted the production of smaller diameter electrodes and by improvements in formulation of the core ingredients. This 2005 revision includes the following significant changes:
Heat input limits are now applied to the preparation of mechanical property test assemblies.
Maximum tensile strength limits have been added for all multiple pass classifications.
Mechanical property tests are required on additional electrode sizes.
Chemical composition limits have been modified.
Welding parameters are specified for diffusible hydrogen testing.
Optional supplemental designators (D and Q) have been added to identify high and low cooling rate mechanical property testing for FEMA and Navy applications.
The evolution took place as follows:
Historical Background
AWS A5.20-69 Specifications for Mild Steel Electrodes for Flux Cored Arc Welding
ANSI W3.20-1973
ANSI/AWS A5.20-79 Specification for Carbon Steel Electrodes for Flux Cored Arc Welding ANSI/AWS A5.20-95 Specification for Carbon Steel Electrodes for Flux Cored Arc Welding AWS A5.20/A5.20M:2005 Specification for Carbon Steel Electrodes for Flux Cored Arc Welding
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, 8669 NW 36 St, # 130, Miami, FL 33166.
AWS A5.20/A5.20M:2005 (R2015)
Page No.
Personnel (Reaffirmation) v
Personnel (Original) vii
Foreword ix
List of Tables xii
List of Figures xii
Scope 1
Normative References 1
Classification 2
Acceptance 6
Certification 6
Rounding Procedure 7
Summary of Tests 7
Retest 8
Test Assemblies 8
Chemical Analysis 13
Radiographic Test 14
Tension Test 15
Bend Test 15
Impact Test 16
Fillet Weld Test 16
Diffusible Hydrogen Test 18
“D” and “Q” Optional Supplemental Designator Tests 19
Method of Manufacture 22
Standard Sizes 23
Finish and Uniformity 23
Standard Package Forms 23
Winding Requirements 24
Filler Metal Identification 24
Packaging 25
Marking of Packages 25
Annex A (Informative)—Guide to AWS Specification for Carbon Steel Electrodes for Flux Cored Arc Welding 27
Annex B (Informative)—Guidelines for Preparation of Technical Inquiries for AWS Technical Committees 39
AWS Filler Metal Specifications by Material and Welding Process 41
AWS Filler Metal Specifications and Related Documents 43
AWS A5.20/A5.20M:2005 (R2015)
Table Page No.
1U A5.20 Mechanical Property Requirements 3
1M A5.20M Mechanical Property Requirements 3
Electrode Usability Requirements 5
Tests Required for Classification 7
Base Metal for Test Assemblies 12
Heat Input Requirements and Suggested Pass and Layer Sequence for Multiple Pass Electrode Classifications 12
Weld Metal Chemical Composition Requirements for Classification to A5.20/A5.20M 14
Dimensional Requirements for Fillet Weld Usability Test Specimens 17
Diffusible Hydrogen Limits for Weld Metal 19
Procedure Requirements for “D” and “Q” Optional Supplemental Designators 21
Mechanical Property Requirements for “D” and “Q” Optional Supplemental Designators 22
Standard Sizes and Tolerances of Electrodes 23
Packaging Requirements 24
Comparison of Classifications 29
Figure Page No.
A5.20/A5.20M Classification System 4
Pad for Chemical Analysis of Deposited Weld Metal 8
Test Assembly for Mechanical Properties and Soundness of Weld Metal 9
Test Assembly for Transverse Tension and Longitudinal Guided Bend Tests for Welds Made
with Single-Pass Electrodes 10
Fillet Weld Test Assembly 11
Dimensions of Fillet Welds 17
Alternate Methods for Facilitating Fillet Weld Fracture 18
Radiographic Standards for Test Assembly in Figure 3 20
Standard Spools—Dimensions of 4 in, 8 in, 12 in, and 14 in [100 mm, 200 mm, 300 mm, and
350 mm] Spools 25
Standard Spools—Dimensions of 22 in, 24 in, and 30 in [560 mm, 610 mm, and 760 mm] Spools 26