AWS B4.0:2016-AMD1 Standard Methods for Mechanical Testing of Welds

About this publication

Product Description

AWS B4.0:2016-AMD1, Standard Methods for Mechanical Testing of Welds, provides standardized mechanical test methods applicable to welds and welded joints. The document is intended for welding engineers, testing laboratories, inspectors, qualification personnel, fabrication organizations and others who need consistent procedures for preparing, testing and reporting mechanical test specimens taken from welded materials.

The standard describes the significance of the covered tests, applicable reference documents, required testing apparatus, specimen preparation, test procedures and reporting requirements. It does not establish the required mechanical properties or acceptance criteria for a particular weldment. Those requirements are supplied by the applicable construction code, material specification, engineering specification or qualification standard.

Edition and Amendment Status

AWS B4.0:2016 is the eighth edition of the AWS mechanical-testing standard and supersedes AWS B4.0:2007. The current AWS catalog product incorporates Amendment 1 and is identified as AWS B4.0:2016-AMD1.

Amendment 1 modifies portions of the fracture-toughness testing requirements associated with Charpy V-notch testing. It does not create a new edition; the underlying publication remains the eighth edition issued in 2016.

Scope

The standard establishes methods for mechanical testing of welds. It describes the significance of each test, required or applicable testing apparatus, preparation of test specimens, test procedures and example reporting practices.

The standard expressly does not define required mechanical properties or acceptance criteria for weld metal. Users must obtain those limits from the governing welding code, construction standard, material specification, project specification or other applicable document.

Units of Measurement

AWS B4.0:2016-AMD1 makes sole normative use of U.S. Customary Units. Approximate SI equivalents are provided in parentheses or appropriate table and figure columns for comparison.

This distinction is important when preparing specimens or evaluating dimensional requirements because the U.S. Customary values are the controlling values of this particular B4.0 edition.

Tension Tests

Clause 4 covers tension testing of welds and welded joints. The section follows a structured format addressing the scope of the test, normative references, nomenclature, summary of methods, significance, apparatus, specimens, procedures, reporting and commentary.

The tension-test material includes multiple specimen configurations for evaluating welded joints and deposited weld metal. These tests can be used to determine tensile behavior under conditions established by the applicable governing specification.

Round Tensile Specimens

The standard illustrates round tensile specimens used for mechanical testing of weld metal and welded joints. Specimen preparation is controlled so that the resulting test is representative of the material or weld region being evaluated.

Transverse Tension Testing

Transverse tension specimens are addressed for welded plate configurations. These specimens are oriented so that the weld and associated regions are evaluated across the welded joint.

All-Weld-Metal Tensile Testing

The standard also addresses all-weld-metal tensile testing where the objective is to characterize deposited weld metal rather than the complete joint. Informative Annexes C and D provide additional recommended practices for all-weld-metal tensile testing of narrow-groove welds and narrow-groove pipeline girth welds.

Shear Tests

Clause 5 addresses shear testing. As with the other principal mechanical test sections, AWS B4.0 provides information on the significance of the method, apparatus, specimen preparation, procedure and reporting.

Shear tests are used where the mechanical behavior of a welded joint under shear loading is relevant to qualification, procedure development or engineering evaluation.

Bend Tests

Clause 6 covers bend testing of welded joints. Bend tests are widely used in welding procedure and welder qualification because they provide a practical means of evaluating weld and heat-affected-zone behavior under severe deformation.

The standard establishes specimen preparation, apparatus and procedural guidance that can be referenced by welding codes and qualification programs requiring standardized bend tests.

Fracture Toughness Tests

Clause 7 addresses fracture toughness testing. This section covers test methods used to evaluate the resistance of welded materials to fracture under specified test conditions.

The fracture-toughness section references applicable ASTM and ISO test methods and includes requirements relating to test apparatus, specimen preparation, procedure and reporting.

Charpy V-Notch Testing

Charpy V-notch impact testing is specifically addressed within the fracture-toughness provisions. The test provides a standardized means of evaluating energy absorbed during fracture of a notched specimen at specified test conditions.

Amendment 1 revises the referenced ASTM document for Charpy V-notch testing from ASTM A370 to ASTM E23 in Clauses 7.2, 7.5.1 and 7.7.1.

Amended Charpy Specimen Figure

Amendment 1 also replaces Figure 7.1, the Charpy V-notch impact specimen figure. The revised figure provides dimensional tolerances and requirements associated with notch geometry, specimen cross section, specimen length, surface finish and ligament dimensions.

Additional Fracture Toughness References

The fracture-toughness section references additional ASTM methods addressing areas such as drop-weight testing, plane-strain fracture toughness, dynamic tear testing, general fracture toughness measurement and reference-temperature determination for ferritic steels.

Hardness Tests

Clause 8 covers hardness testing of welds and welded joints. The standard provides example hardness-test locations for butt welds and fillet welds and discusses the apparatus, specimen condition, testing procedure and reporting needed for consistent evaluation.

Hardness measurements can be used to characterize weld metal, heat-affected zones and base material where hardness is important to fabrication procedure development, material evaluation or service requirements.

Break Tests

Clause 9 addresses destructive break-testing methods, including nick-break testing and fillet-weld break testing.

These methods allow examination of fractured weld surfaces and are commonly associated with welding procedure and personnel qualification activities where internal weld quality or fusion characteristics must be evaluated.

Nick-Break Tests

The standard includes several nick-break specimen and fixture configurations, including pipe-based fixtures, vise and anvil testing arrangements, flash butt weld specimens, branch-joint connections and pipe-sleeve specimens.

The variety of configurations reflects the different joint geometries and qualification applications in which destructive break testing can be used.

Fillet-Weld Break Tests

The fillet-weld break section includes specimen configurations for procedure qualification, primer-coated materials, galvanized materials, welder qualification and tack-welder qualification.

The standard also illustrates the method used to load and break the fillet-weld specimen for subsequent evaluation.

Weldability Testing

Clause 10 provides a substantial collection of standardized weldability tests. These test methods are used to investigate susceptibility to cracking or other welding-related metallurgical behavior under controlled test conditions.

AWS B4.0 includes nine individual weldability methods, allowing engineers and researchers to select test configurations appropriate to the material behavior or welding condition being investigated.

Controlled Thermal Severity Test

The Controlled Thermal Severity, or CTS, test is included as a standardized weldability method. The standard provides fixture information, specimen configuration, cooling-bath arrangement, sectioning guidance and optional microhardness locations.

A suggested CTS data sheet is also included to support consistent documentation of test conditions and results.

Cruciform Test

The cruciform test provides a restrained welded-joint configuration for investigating cracking behavior. AWS B4.0 includes assembly details and locations for sectioning and examination of cracks within the test specimen.

Implant Test

The implant test is included as another controlled weldability method for evaluating cracking behavior under defined welding and loading conditions.

Lehigh Restraint Test

The Lehigh restraint test evaluates weldability using a restrained test configuration. Its inclusion provides users with another established method for studying cracking sensitivity under controlled conditions.

Varestraint Test

The Varestraint test is included for evaluation of cracking susceptibility under imposed strain during welding. It is frequently associated with research and procedure development involving solidification and hot-cracking behavior.

Oblique Y-Groove Test

The oblique Y-groove method is included among the standard's weldability tests. It uses a restrained groove configuration to evaluate cracking susceptibility under defined welding conditions.

Welding Institute of Canada Test

The Welding Institute of Canada, or WIC, test is another cracking evaluation method included in the standard's weldability-testing section.

Trough Test

The trough test provides an additional controlled test configuration for investigating weldability and cracking behavior.

Gapped Bead-on-Plate Test

The Gapped Bead on Plate, or GBOP, test is included as the ninth weldability method in Clause 10 and provides a standardized specimen and procedure for evaluating selected welding behavior.

Process-Specific Tests

Clause 11 contains test methods associated with particular welding processes or joint types. The two major categories are stud weld testing and resistance weld testing.

Stud Weld Tests

AWS B4.0 provides methods for mechanical evaluation of stud welds. These procedures supply a standardized basis for testing welded studs where required by a governing fabrication or qualification standard.

Resistance Weld Tests

The standard also includes mechanical test methods for resistance welds. The procedures address test configurations applicable to joints produced using resistance welding processes.

Test Apparatus

For the major test methods, B4.0 identifies the equipment or apparatus needed to perform the test. The apparatus requirements are coordinated with applicable ANSI, ASTM, API and other reference documents where appropriate.

Using defined apparatus helps laboratories and fabricators produce comparable results rather than relying on improvised test equipment or loading arrangements.

Specimen Preparation

Specimen geometry and preparation are fundamental to mechanical testing because changes in dimensions, orientation, surface condition or extraction location can affect test results.

The standard therefore provides specimen configurations, dimensional details and preparation guidance for the covered mechanical and weldability tests.

Test Procedures

Each principal section provides procedural guidance describing how the test is to be conducted. The procedures work with the specified apparatus and specimen geometry to provide consistent mechanical-test methods across laboratories and fabrication organizations.

Reporting Requirements

AWS B4.0 includes reporting requirements and example test-results sheets. Proper reporting helps document specimen identification, test conditions, measured results and other information needed to interpret or reproduce the test.

The reporting framework is useful for welding procedure qualification records, material evaluation programs, research programs and quality-control testing.

Relationship to ASTM and API Test Methods

The standard identifies applicable ANSI, ASTM and API documents for individual mechanical test methods. AWS B4.0 does not attempt to replace every general materials-testing standard; instead, it adapts and organizes mechanical testing specifically for welds and welded joints.

This allows welding professionals to use established general test methods while applying specimen configurations and procedures appropriate to welded materials.

Acceptance Criteria Are Not Included

A critical limitation of the standard is that it does not establish the mechanical-property values or acceptance criteria that a weld must satisfy.

A construction code or specification may require, for example, particular tensile strength, impact energy, bend-test performance or hardness limits. AWS B4.0 explains how to perform the applicable test, while the governing document determines whether the result is acceptable.

2016 Eighth Edition Changes

The 2016 edition is the eighth edition of a document first issued in 1942. AWS states that this edition added two informative annexes addressing tensile testing of narrow-groove welds and updated several figures.

The two added annexes provide recommended practices for all-weld-metal tensile testing of narrow-groove welds and narrow-groove pipeline girth welds.

Amendment 1

Amendment 1 is incorporated into the current AWS B4.0:2016 reprint. The amendment makes targeted corrections to the fracture-toughness section rather than rewriting the entire standard.

• Clause 7.2 replaces the Charpy reference to ASTM A370 with ASTM E23.
• Clause 7.5.1 replaces ASTM A370 with ASTM E23 for Charpy V-notch testing apparatus.
• Clause 7.7.1 replaces ASTM A370 with ASTM E23 for Charpy V-notch test procedure requirements.
• Figure 7.1 is replaced with a revised Charpy V-notch impact specimen figure and dimensional tolerances.

Informative Annex A — Bibliography

Annex A provides a bibliography of technical references supporting the mechanical-testing methods and related welding-test practices addressed in the standard.

Informative Annex B — Official Interpretations

Annex B explains the AWS procedure for requesting an official interpretation of a technical requirement in the standard.

Informative Annex C — Narrow-Groove Weld Tensile Testing

Annex C provides recommended practice for all-weld-metal tensile testing of narrow-groove welds. This material was added in the eighth edition to address challenges associated with obtaining representative tensile specimens from narrow-groove weld deposits.

Informative Annex D — Narrow-Groove Pipeline Girth Welds

Annex D provides recommended practice for all-weld-metal tensile testing of narrow-groove pipeline girth welds. It includes specimen preparation and dimensional information specifically oriented toward pipeline welding applications.

Edition History

The mechanical-testing standard was first published in 1942 as AWS A4.0-42. Subsequent editions were issued in 1974, 1977, 1985, 1992, 1998 and 2007 before publication of the eighth edition in 2016.

Across these revisions, the standard expanded to include additional fracture-toughness, hardness, weldability and process-specific testing methods.

American National Standard

AWS B4.0:2016-AMD1 is identified by AWS as an American National Standard developed under ANSI consensus procedures.

Technical Committee

The standard was prepared by the AWS B4 Committee on Mechanical Testing of Welds under the direction of the AWS Technical Activities Committee.

Who Should Use AWS B4.0:2016-AMD1

• welding engineers and welding procedure developers;
• mechanical testing laboratories;
• Certified Welding Inspectors and quality-control personnel;
• fabricators performing procedure qualification testing;
• welder and welding operator qualification facilities;
• materials and metallurgical engineers;
• pipeline welding and testing organizations;
• research and development laboratories;
• structural and pressure-equipment fabricators;
• organizations evaluating weldability or fracture behavior;
• personnel responsible for mechanical-test specimen preparation and reporting.

Why This Standard Matters

Mechanical test results are meaningful only when specimens, apparatus and test procedures are sufficiently controlled. Small differences in specimen geometry, extraction location, loading method or test setup can make results difficult to compare.

AWS B4.0 provides a welding-specific framework for standardizing those activities. Its coverage ranges from common qualification tests such as tension, bend and fillet-weld break testing to specialized fracture-toughness and weldability tests used in engineering evaluation and research.

Product Features

• 8th edition of AWS B4.0
• Incorporates Amendment 1
• American National Standard
• Establishes mechanical test methods for welds and welded joints
• Covers tension testing
• Covers shear testing
• Covers bend testing
• Covers fracture-toughness testing
• Includes Charpy V-notch testing
• Covers hardness testing
• Includes nick-break and fillet-weld break tests
• Includes nine weldability test methods
• Covers CTS, cruciform, implant, Lehigh restraint and Varestraint tests
• Covers oblique Y-groove, WIC, trough and GBOP tests
• Includes stud-weld mechanical testing
• Includes resistance-weld testing
• Provides specimen preparation and apparatus guidance
• Includes reporting requirements and example test-result sheets
• Includes recommended narrow-groove weld tensile-testing practices
• Uses U.S. Customary Units with approximate SI equivalents

Product Details

• Standard: AWS B4.0:2016-AMD1
• Title: Standard Methods for Mechanical Testing of Welds
• Publisher: American Welding Society
• Edition: 8th Edition, 2016, incorporating Amendment 1
• Publication Year: 2016
• Print ISBN: 978-0-87171-889-1
• Page Count: 184
• ANSI Status: American National Standard
• Technical Committee: AWS B4 Committee on Mechanical Testing of Welds
• Previous Edition: AWS B4.0:2007
• Units: U.S. Customary Units with approximate SI equivalents
• Amendment: Amendment 1 incorporated into the current reprint
• Language: English
• Publication Type: Standard

Edition Status Note

AWS B4.0:2016-AMD1 remains the current B4.0 publication listed by the American Welding Society. It is the eighth edition of the standard and supersedes AWS B4.0:2007. Amendment 1 is incorporated into the current reprint and updates selected fracture-toughness provisions and the Charpy V-notch specimen figure without creating a new edition.