ASTM WK75029

    New Specification for Laser and Laser Hybrid Welded Carbon Steel Sharp Cornered Structural Hollow Sections

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    Developed by Subcommittee: A01.09 | Committee A01 | Contact Staff Manager



    WK75029

    1. Scope

    1. Scope 1.1This specification covers laser or laser hybrid welded carbon steel sharp cornered square, rectangular, or special shape structural tubing for welded, riveted, or bolted construction for industrial, buildings and general structural purposes. Note: There is no standard for other sharp cornered laser or laser hybrid welded carbon steel structural shapes. Appendix A provides guidance on the specification of beams, tees, channels, angles and custom shapes. 1.2The structural hollow sections produced to this specification with a periphery of 112 in. [2845 mm] or less, and a specified wall thickness of 1.000 in. [25.4 mm] or less. 1.3This specification establishes the minimum requirements for manufacturing of sharp cornered laser welded carbon steel hollow sections and requires the welds to, at minimum, match the strength of the base metal. 1.4This specification refers to A36 for chemical requirements, but the mechanical test requirements are determined by section xx.xx of this standard. 1.5The text of this specification contains notes and footnotes that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements. 1.6The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.7This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    Keywords

    laser welded hollow structural sections; laser fused hollow structural sections; structural carbon steel; buildings; industrial;

    Rationale

    The scope of AWS D1.1 states, This code contains the requirements for fabricating and erecting welded steel structures but it does not cover dedicated production methods for structural shapes. Architectural and industrial applications are increasingly using precision sharp cornered laser- and laser-hybrid products. In building applications, structural aluminum doesnt satisfy the structural requirements so structural engineers are specifying HSS sections but the standard product does not satisfy the requirements because it has round corners making laser welded product necessary. These products are being used in life safety critical applications such as supporting walls and egress stairs. In a series of emails last year, Mr. Elhert of Novum Structures, a fabricator who purchases the product, communicated the need for this ASTM standard, while mentioning that a standard already exists for stainless steel. Since then, manufacturers of this product Montanstahl and Stainless Structurals and three additional fabricators who purchase laser welded carbon steel, TriPyramid, Feature Walters and Mistral Architectural Metal & Glass, have written letters of support. Structural engineers need a standard to which they can specify as well as assurance of quality and some are specifying ASTM A1069/A1069M, which is for laser and laser hybrid welded stainless steel, when ordering carbon steel. ANSI/AISC 360 provides the expected weld design strength but does not limit the welding methods that can be used or establish quality requirements. Engineers are assuming that all welded sections, including laser and laser hybrid carbon and alloy steel shapes, meet AISC 360 weld strength tables. AWS D1.1 is typically referenced in project specifications but does not provide requirements for laser and laser hybrid welding. The goal of this standard is to fill the existing specification gap so that engineers have a means of ordering a high quality carbon steel product. The stainless steel standard, ASTM A1069, is proposed as a model for this work since it uses the existing laser and laser hybrid AWS and ISO standards to set minimum requirements for process and operator qualification and requires adherence to the requirements of the existing relevant ASTM standards setting a logical baseline for production of standard product. There are ISO and AWS standards for laser and laser hybrid operator and process qualification which apply to all steels. So, referencing them avoids a conflict between standards and unnecessary standard length while capitalizing on the expertise of those standard setting bodies. While these standards set welding requirements, base metal /input shape requirements and final product dimensional tolerances are equally important in producing a high quality shape. This standard is being sponsored by A01.09 Carbon Steel Tubular Shapes and focused on HSS. Custom laser and laser hybrid carbon steel structural shapes other than HSS are purchased so a non-mandatory appendix is planned to provide guidance for specifiers of these products since it has been determined that there is currently no A01 subcommittee that is an appropriate fit for a standard covering these products.

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:
    12-02-2020

    Technical Contact:
    Catherine Houska

    Status:
    Draft Under Development