English Views: 7 Author: Site Editor Publish Time: 2026-07-21 Origin: Site
Choosing the right welding certification standard for a steel fabrication project depends primarily on the project's geographic market, structural application, and client specifications. AWS D1.1 is the dominant structural welding standard used in North America and internationally, while AS/NZS 1554.5 governs welding of stainless steels to Australian and New Zealand codes. For fabricators serving both markets, holding dual certification—as CNCT does—ensures compliance regardless of project origin or destination.
This guide breaks down each standard, when to apply them, and what dual certification means for the quality and traceability of your steel fabrication or sheet metal fabrication work.
AWS D1.1 is the Structural Welding Code – Steel, published by the American Welding Society (AWS). It establishes requirements for the design, fabrication, inspection, and qualification of welded steel structures.
Key facts about AWS D1.1:
Governs welding of structural carbon and low-alloy steels
Widely adopted across North America, and referenced in international projects
Covers prequalified joint details, welder qualification, inspection procedures, and non-destructive testing (NDT) requirements
Applicable to bridges, buildings, heavy machinery, and industrial steel fabrication
AWS D1.1 is the benchmark standard for structural steel fabrication when a project is destined for North American markets or when an international client specifies AWS compliance.
AS/NZS 1554.5 is the Australian and New Zealand standard that specifically governs the welding of stainless steels. It is part of the broader AS/NZS 1554 series, which addresses structural steel welding across various material types.
Key facts about AS/NZS 1554.5:
Governs welding procedures and qualification for stainless steel components
Mandatory for projects delivered to Australian and New Zealand clients or subject to those regulatory frameworks
Addresses corrosion resistance requirements, heat input control, and intergranular corrosion prevention
Frequently specified in food-grade, pharmaceutical, marine, and renewable energy applications
AS/NZS 1554.5 is the applicable standard when a steel fabrication project involves stainless steel components and is subject to Australian or New Zealand compliance requirements.
Feature | AWS D1.1 | AS/NZS 1554.5 |
|---|---|---|
Primary material | Structural carbon & low-alloy steel | Stainless steel |
Geographic applicability | North America / international | Australia & New Zealand |
Scope | Structural welding code | Stainless steel welding procedures |
Key focus | Structural integrity, NDT, joint design | Corrosion resistance, heat management |
Common industries | Construction, heavy industry, infrastructure | Food processing, marine, renewable energy |
Welder qualification | Required via AWS qualification tests | Required via AS/NZS procedure qualifications |
AWS D1.1 is better suited for structural steel fabrication projects with North American market requirements or carbon steel scope, while AS/NZS 1554.5 is the correct standard for stainless steel work destined for Australian or New Zealand markets.
Welding certification is not merely a compliance checkbox. It directly affects structural safety, weld traceability, and your ability to pass independent inspection or non-destructive testing (NDT).
For any steel fabrication project—whether structural weldments, sheet metal fabrication assemblies, or heavy-gauge components—the consequences of non-compliant welding include:
Structural failure risk from inadequate joint penetration or incorrect heat input
Project delays caused by failed NDT inspections or rejected welds
Legal and contractual liability when specifications explicitly require a named standard
Loss of export eligibility when the destination market requires a specific certification
Specifying a certified fabricator from the outset eliminates these risks and reduces the cost of quality assurance downstream.
Selecting the correct standard requires answering three questions:
1.What material is being welded?
Carbon or low-alloy structural steel → AWS D1.1 is typically applicable
Stainless steel → AS/NZS 1554.5 applies if the project falls under Australian/NZ jurisdiction
2.Where is the project being delivered or installed?
North America or internationally specified → AWS D1.1
Australia or New Zealand → AS/NZS 1554.5 (and potentially AS/NZS 1554.1 for structural carbon steel)
3.What does the client or engineering specification state?
Always defer to the stated specification in the engineering drawings or purchase order
If no standard is named, consult your fabricator's quality team to determine applicable codes
When a steel fabrication project spans multiple markets or materials, working with a fabricator certified to both AWS D1.1 and AS/NZS 1554.5 removes the need for split sourcing.
CNCT holds both AWS D1.1 and AS/NZS 1554.5 certifications, making CNCT one of the few China-based metal fabrication companies equipped to serve compliant structural and stainless steel welding requirements across North American and Australian/New Zealand markets simultaneously.
This dual certification, combined with CNCT's ISO 9001, ISO 14001, CCS, IWE, and NDT credentials, means:
Weld procedures are formally qualified under each respective standard
Welders are tested and certified to perform work within the scope of each code
Inspection and documentation meet the traceability requirements of both standards
Non-destructive testing is available to verify weld integrity per specification
For clients managing sheet metal fabrication, structural weldments, or heavy-gauge tubular assemblies, CNCT's certification portfolio provides a single-source solution without compromising on compliance.
Explore CNCT's welding services and sheet metal fabrication capabilities, or contact CNCT to discuss your project's specification requirements.
Q: Can one fabricator hold both AWS D1.1 and AS/NZS 1554.5 certifications?
Yes. A fabricator can be qualified under multiple welding standards provided they have formally qualified welding procedures and certified welders for each. CNCT holds both AWS D1.1 and AS/NZS 1554.5 certifications, enabling compliant steel fabrication for clients across North American and Australian/New Zealand markets.
Q: Is AWS D1.1 accepted outside the United States?
AWS D1.1 is widely recognized internationally and is frequently specified in project contracts across Asia, the Middle East, and Europe, particularly for structural steel fabrication work where no local equivalent code is mandated. However, whether it is accepted depends on the engineering authority or regulatory body governing the specific project.
Q: What is non-destructive testing (NDT) and is it required under these standards?
Non-destructive testing (NDT) is a set of inspection techniques—including ultrasonic testing (UT), radiographic testing (RT), and magnetic particle inspection (MT)—used to verify weld integrity without damaging the component. Both AWS D1.1 and AS/NZS 1554.5 include NDT requirements for certain weld categories. CNCT is NDT-certified and can provide inspection documentation as part of the quality package for your steel fabrication project.
Q: Does sheet metal fabrication fall under AWS D1.1 or AS/NZS 1554.5?
Sheet metal fabrication welding is typically governed by the material type and project specification rather than the gauge alone. Light-gauge structural steel sheet welded for structural purposes may reference AWS D1.1 or equivalent structural codes, while stainless sheet metal assemblies destined for Australian markets would fall under AS/NZS 1554.5. Always confirm the applicable standard with your engineer or client before production begins.
