AS 3679.2 - 2010 Structural steel - Welded I sections

This Standard specifies requirements for the production and supply of welded I sections for general structural and engineering purposes. This Standard does not cover the following: (a) Structural steel—Hot-rolled bars and sections. (b) Steel plates for pressure equipment. (c) Structural steel—Hot-rolled plates, floorplates and slabs. (d) Carbon steels and carbon-manganese steels—Hot-rolled bars and semifinished products. (e) Structural steel hollow sections. (f) Steel reinforcing bars for concrete. (g) Structural and pressure vessel steel—Quenched and tempered plate. (h) Built-up I sections fabricated in accordance with AS 3990, AS 4100 or NZS 3404. NOTE: Guidelines to purchasers on requirements that should be specified by the purchaser and those that should or may be agreed on at the time of enquiry and order are specified in Appendix A. Product conformity with this Standard is specified in Appendix B.

Australian/New Zealand Standard ™

Structural steel Part 2: Welded I sections

AS/NZS 3679.2:2010

This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee BD-023, Structural Steel It was approved on behalf of the Council of Standards Australia on 28 October 2010 and on behalf of the Council of Standards New Zealand on 5 November 2010

This Standard was published on 26 November 2010

The following are represented on Committee BD-023:

Austroads

Australian Chamber of Commerce and Industry

Australian Industry Group

Australian Steel Association

Australian Steel Institute

Bureau of Steel Manufacturers of Australia

Business New Zealand

Steel Construction New Zealand

The University of New South Wales

The University of Sydney

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This Standard was issued in draft form for comment as DR 07235

Australian/New Zealand Standard ™

Structural steel

Part 2: Welded I sections

COPYRIGHT

© Standards Australia Limited/Standards New Zealand

All rights are reserved No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher, unless otherwise permitted under the Copyright Act 1968 (Australia) or the Copyright Act 1994 (New Zealand)

Jointly published by SAI Global Limited under licence from Standards Australia Limited, GPO Box 476, Sydney, NSW 2001 and by Standards New Zealand, Private Bag 2439, Wellington 6140

Originated in Australia as AS 3679.2—1991

Jointly revised and designated AS/NZS 3679.2:1996

Third edition 2010

I sections being subjected to dynamic and other special loads

The contents of this edition align with:

AS

3597 Structural and pressure vessel steel—Quenched and tempered plate

AS/NZS

1163 Structural steel hollow sections

3678 Structural steel—Hot-rolled plates, floorplates and slabs

3679 Structural steel

3679.1 Part 1: Hot-rolled bars and sections

This edition incorporates the following major changes to the previous edition:

(a) Redundant grades 250, 250L0, 250L15, 350, 350L0 and 350L15 have been removed (b) The mandatory requirement for test reports and test certificates to be performed by third-party accredited laboratories

(c) The introduction of mandatory minimum information required on test certificates (d) The inclusion of Appendix B on product conformity as a mandatory provision for conformance with this Standard

(e) The web-to-flange testing frequency has been revised and moved to Appendix B (f) Section dimensions has been moved to the new Appendix C

To permit the steel industry time to adjust to the new edition of the Standard, the 1996 edition of AS/NZS 3679.1 will remain ‘available superseded’ and will be withdrawn 12 months from the date of publication of this Standard

A statement expressed in mandatory terms in a note to a table is deemed to be a requirement

CONTENTS

Page

1 SCOPE 4

2 NORMATIVE REFERENCES 4

3 DEFINITIONS 5

4 DESIGNATION 6

5 MATERIALS 6

6 MANUFACTURING PROCESS 6

7 MANUFACTURING TOLERANCES 7

8 MECHANICAL TEST REQUIREMENTS 8

9 WELD QUALITY, TESTING AND EXAMINATION 8

10 IDENTIFICATION, CERTIFICATION AND INDEPENDENT TESTS 8

11 ROUNDING OFF NUMBERS 9

APPENDICES A PURCHASING GUIDELINES 15

B PRODUCT CONFORMITY 17

C DIMENSIONS 19

D MEASUREMENT OF CAMBER AND SWEEP IN WELDED I SECTIONS 22

E WELDED SECTIONS FOR FRACTURE CRITICAL APPLICATIONS 23

BIBLIOGRAPHY 24

STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND

Australian/New Zealand Standard

This Standard does not cover the following:

(a) Structural steel—Hot-rolled bars and sections

(b) Steel plates for pressure equipment

(c) Structural steel—Hot-rolled plates, floorplates and slabs

(d) Carbon steels and carbon-manganese steels—Hot-rolled bars and semifinished products

(e) Structural steel hollow sections

(f) Steel reinforcing bars for concrete

(g) Structural and pressure vessel steel—Quenched and tempered plate

(h) Built-up I sections fabricated in accordance with AS 3990, AS 4100 or NZS 3404

NOTE: Guidelines to purchasers on requirements that should be specified by the purchaser and those that should or may be agreed on at the time of enquiry and order are specified in Appendix A

Product conformity with this Standard is specified in Appendix B

For New Zealand only, additional requirements for welded steel sections for fracture critical applications are specified in Appendix E

2 NORMATIVE REFERENCES

The following documents are indispensable for the application of this Standard:

NOTE: References for informative purposes are included in the Bibliography

AS

1365 Tolerances for flat-rolled steel products

1391 Metallic materials—Tensile testing at ambient temperature

2706 Numerical values—Rounding and interpretation of limiting values

AS/NZS

1554 Structural steel welding

1554.1 Part 1: Welding of steel structures

3678 Structural steel—Hot-rolled plates, floor plates and slabs

NZS

3404 Steel structures Standard

3404.1 Part 1: Materials, fabrication, and construction

To imply a capability or possibility and refers to the ability of the user of the Standard, or

to a possibility that is available or that might occur

AS/NZS 3679.2 = number of this Standard

300 and 400 = nominal minimum yield stress of the steel

L15 = low temperature impact test at −15°C

6.2 Plate cutting or preparation

Plates shall be stripped to size using either thermal or mechanical cutting processes to produce an edge condition that ensures the welds comply with AS/NZS 1554.1, Category SP

The procedure used shall produce cut edges equal to the quality resulting from thermal cutting

Edges, not incorporated in welds, shall have a surface finish of Class 3 or better Edges, incorporated in welds, shall have a surface finish of Class 2 or better as defined in WTIA, Technical Note 5

NOTE: WTIA, Technical Note 5 gives guidance on cutting procedures together with replicas of cut surfaces

Web-to-flange welds may be complete or incomplete penetration joints, depending on the web thickness or the welding procedure

NOTES:

1 For automatic welding, the equipment may or may not perform the loading and unloading of the work

2 Additional welding or strengthening may be undertaken by the purchaser, if necessary

3 The availability of welded I sections with complete penetration joints is subject to negotiation between manufacturer and purchaser

6.3.3 Butt welds

Butt welds in flange or web components are permitted if the required length of the member

is greater than the available rolled length of the component The joints shall be penetration butt welds, ground flush in the longitudinal direction of the section and subject

complete-to 100% ultrasonic testing Butt joints in any component shall be completed before the component is welded to another component of the member

6.4 Welding used in the repair of production welding

Weld repair of defects in production welding shall result in the penetration and joint properties equivalent to those produced by automatic welding Welding shall be in accordance with AS/NZS 1554.1, Category SP The repair weld shall be ground to make it flush with the original production weld

7 MANUFACTURING TOLERANCES

7.1 General

Variations from nominal dimensions of a welded I section shall not exceed the appropriate limits given in Tables 1 and 2, and Figures 1 to 4 These tests shall be performed by a laboratory accredited by signatories to the International Laboratory Accreditation Corporation (ILAC) through their Mutual Recognition Agreement (MRA), in the field and class of testing, on behalf of the manufacturer for the purpose of establishing compliance with this Standard The appropriate log or further details of the ILAC (MRA) signatory shall be also noted on the document

NOTE: In Australia, ILAC (MRA) accredited bodies include National Association of Testing Authorities (NATA) and in New Zealand they include International Accreditation New Zealand (IANZ)

7.2 Web and flange thickness

The tolerances on web and flange thicknesses shall be in accordance with those specified for plates in AS 1365

8 MECHANICAL TEST REQUIREMENTS

The tensile strength determined by the welded web-to-flange test shall conform to the limits given in Table 3, as appropriate

9 WELD QUALITY, TESTING AND EXAMINATION

To assess compliance with Clause 6.3 and Table 3, the following shall be performed:

(a) Visual examination of welds produced

(b) Welded web-to-flange tensile test (see Clause 8, and Figures 5 and 6)

(c) Macro test of welds at the same test frequency as specified in Clause B2.2 and Figures 5 and 6

(d) Non-destructive examination by suitable means of weld repair to establish that all repairs are of equal quality to production welds

Specimens prepared for welded web-to-flange tension tests and for macro examination shall

be fully representative of the welds throughout the length of the welded I section, and the welded I section shall be fully representative of a production run Specimens shall not be taken at any place where a weld has been repaired or differs in any way from the standard weld produced during the production run

Welded web-to-flange test shall be carried out in accordance with AS 1391

10 IDENTIFICATION, CERTIFICATION AND INDEPENDENT TESTS

10.1 Identification

The welded I section sizes shall be clearly and legibly identified as follows:

(a) The manufacturer’s name or mark, or both

(b) The grade of steel and designation (see Clause 4)

(c) The product to be identified with this Standard

(d) The welded section number

Records shall be maintained identifying the heat numbers of the steel used in each welded I section

Where identification is by means of die-stamping, low-stress stamps shall be used for impact tested grades

NOTES:

1 If the identified portion of the product is subsequently removed, then these identifications are

to be transferred to each remaining portion of the product

2 Manufacturers making a statement of compliance with this Standard on a product, packaging

or promotional material related to that product are advised to ensure that such compliance is capable of being verified

10.2 Certification

10.2.1 Certificate of compliance

If requested by the purchaser at the time of enquiry and order, the manufacturer should provide a certificate of compliance that includes a statement that the product complies with this Standard

10.2.2 Test reports

A test report shall provide results relating to the following:

(a) Tests performed by the manufacturer for the purpose of establishing compliance with this Standard

(b) Additional tests as agreed between the purchaser and the manufacturer

10.2.3 Minimum requirements for certificates of compliance

Any certificate or report issued by the manufacturer shall be written in English alphanumeric characters and shall have the following:

(a) Manufacturer’s, supplier’s and testing authority’s name

(b) Certificate/report number

(c) Date

(d) Product, testing specification and grade, e.g AS/NZS 3679.2 300 Grade

(e) Product designation (see Figures C1 and C2)

(f) Heat numbers to identify the steel used in manufacturing each welded I section

(g) Length, bundle, pack or unique identifier of welded I sections to which the certificate

or report applies

(h) Tests performed by the manufacturer for the purpose of establishing compliance with this Standard

(i) Additional tests as agreed between the purchaser and the manufacturer

(j) Statement acknowledging material being supplied in accordance with Items (a) to (i) (k) Signatory from manufacturer, supplier and testing authority attesting to Items (a)

to (k)

10.3 Independent tests

In the event of a dispute as to the compliance of the steel with this Standard, the referee testing shall be carried out by independent laboratories accredited by signatories to ILAC (MRA)

11 ROUNDING OFF NUMBERS

11.1 General

For the purpose of deciding whether a particular requirement of this Standard is complied with, the determined value, observed or calculated, shall be rounded off in accordance with

AS 2706

The number of significant places retained in the rounded-off value shall be the same as that

of the specified value in the appropriate material Standard

11.2 Welded web-to-flange test

The determined value of tensile strength shall be rounded off to the nearest 10 MPa

TABLE 1 PERMISSIBLE VARIATIONS IN STRAIGHTNESS

FOR WELDED I SECTIONS

Sections with a flange width (b f)

approximately equal to the depth (d):

(a) Lengths of 14 m and less

1000

Length but not more than 10 mm (b) Lengths greater than 14 m

10 mm +

1000 14000 Length −

All other sections

1000 Length

NOTE: Owing to the extreme variation in the elastic flexibility of welded

reproducible sweep measurements Measuring of sweep shall be in accordance with Appendix D

TABLE 2 PERMISSIBLE VARIATIONS IN LENGTH

FOR WELDED I SECTIONS

Permissible variation from specified length, mm Specified length, m

Under Over

TABLE 3 TENSILE TEST REQUIREMENTS FOR WELDED

WEB-TO-FLANGE TEST

Grade to

AS/NZS 3678

Specified minimum tensile strength MPa

12

16 and greater

4.30 5.16 6.88

12

16 and greater

4.80 5.76 7.68 NOTE: For web plate thicknesses greater than 16 mm, the web-to-flange weld is to develop the specified minimum tensile strength of a 16 mm thick web only (see Clause 8.2)

NOTES:

1 Dimensions d0, d, a1 and a0 are measured parallel with the centre-line of the web Dimensions bf and

b f/2 ± e are measured parallel with the plane of the flange

2 Dimension d is measured at the centre-line of the web

1 2 3 4 5 6

Permissible variation of depth

Permissible variation of flange width

Permissible out-of- square on each flange

Permissible total out- of-square

Permissible web off-centre Designation

FIGURE 1 PERMISSIBLE VARIATIONS IN CROSS-SECTIONAL DIMENSIONS

FOR WELDED BEAMS

NOTES:

1 Dimensions d0, d, a1 and a0 are measured parallel with the centre-line of the web Dimensions bf and

b f/2 ±e are measured parallel with the plane of the flange

2 Dimension d is measured at the centre-line of the web

Permissible variation of depth

Permissible variation of flange width

Permissible out-of- square on each flange

Permissible total out- of-square

Permissible web off-centre Designation

FIGURE 2 PERMISSIBLE VARIATIONS IN CROSS-SECTIONAL DIMENSIONS

FOR WELDED COLUMNS