AWS D1.5: Bridge Welding Code
Specialized welding code for bridge construction covering higher strength steels and fatigue-critical applications. AWS D1.5 specifies stricter inspection requirements than AWS D1.1 for high-stress bridge members.
The American Welding Society (AWS) publishes the welding codes that name the qualified procedures, qualified welders, and weld-NDE acceptance criteria used across structural and fabrication contracts.
Building codes (e.g. AISC 360) cite AWS D1 directly; structural steel work in the U.S. is effectively gated by AWS qualification packages.
AWS D1.5 is invoked when the scope of work matches its title — bridge welding code — and when the contract or regulatory regime cites it as the controlling document.
Methods covered
Industries
- Bridge Construction
- Infrastructure
- Personnel qualification: examinations under AWS D1.5 must be performed by inspectors qualified and certified to a recognised scheme (typically ASNT SNT-TC-1A, CP-189, or ISO 9712 depending on jurisdiction), with documented training hours, vision tests, and a controlling written practice.
- Written procedure: every examination requires a written, controlled procedure that names the method, equipment, calibration steps, scanning pattern, and acceptance criteria — and is qualified before first use.
- Equipment verification: ultrasonic instruments must be verified against a calibration block (V1, V2, IIW, or job-specific reference) at intervals defined by the procedure — typically before use, every four hours of scanning, on operator change, and at end of shift.
- Image-quality verification: every radiograph or digital exposure carries a penetrameter / IQI of the type and thickness specified by the standard; the IQI must be visible and at the required sensitivity for the radiograph to be acceptable.
- Radiation safety: source handling, exclusion zones, dosimetry, and source recordkeeping must follow the licensing authority's rules in addition to the inspection standard itself.
- Magnetic-particle technique: magnetisation method (yoke, prods, central conductor, multidirectional), field strength verification (pie gauge, Hall-effect meter, or QQI), and demagnetisation are all specified in the written procedure.
- Acceptance criteria: indications are evaluated against the standard's tabulated limits (length, depth, alignment, frequency); any indication exceeding the criteria is recorded, dispositioned, and either repaired or evaluated for fitness-for-service.
- Documentation: examination reports must include enough information for a third party to reproduce the inspection — equipment serial numbers, calibration records, inspector ID, sketches of indications, and the controlling procedure revision.
- Latest Edition
- 2020
- First Published
- 1995
- Scope
- Bridge Welding Code — fracture-critical and non-fracture-critical members of steel highway bridges; co-published with AASHTO.
- Acceptance Criteria
- Stricter than D1.1 — fracture-critical members require CVN-toughness-qualified WPS, RT/UT on every CJP weld, zero tolerance for cracks.
- Calibration / Qualification
- Welders per Cl. 5; NDE personnel per AWS QC1; fabricators must be AISC certified for major bridges in many jurisdictions.
Key Clauses Inspectors Cite
- Cl. 5 — Welding Process Requirements
- Cl. 6 — NDE
- Cl. 12 — Fracture Control Plan (FCP) for FCM
- Annex 1 — Fracture Control Plan
Companion / Parent Standards
AWS D1.1 · AASHTO LRFD Bridge Design Specs · AISC 360
Sample Contract Language
“All welding of fracture-critical members shall conform to AWS D1.5:2020 Cl. 12 Fracture Control Plan; 100% NDE; CVN-qualified procedures.”
AWS D1.5 is maintained on its publishing organisation's revision cycle. The version cited in any contract or written inspection program should be tracked so that revisions can be reviewed against the existing inspection plan and any clause changes worked into the next procedure update.
On a typical Bridge Construction job, AWS D1.5 is reproduced inside the inspection company's written procedure, the procedure is qualified for the customer, and each examination report cites the procedure revision back to the controlling clause of the standard.
What does AWS D1.5 cover?
AWS D1.5 (Bridge Welding Code) is published by AWS. Specialized welding code for bridge construction covering higher strength steels and fatigue-critical applications.
Is AWS D1.5 mandatory or voluntary?
AWS D1.5 is a consensus standard. It becomes mandatory when invoked by a contract, by another code that cites it (for example ASME Section V calling out an ASTM practice), or by a regulator that has adopted it into law in a specific jurisdiction.
Who is qualified to perform inspections under AWS D1.5?
Inspections under AWS D1.5 must be performed by personnel qualified and certified to a recognised NDT certification scheme — most commonly ASNT SNT-TC-1A or CP-189 in the United States, ISO 9712 in much of the rest of the world, and NAS 410 for aerospace work. The written practice that controls qualification must be in place before any examination is started.
Which other standards are commonly cited alongside AWS D1.5?
AWS D1.5 is most often cited together with the parent code that brings it into the contract — typically ASME Section V or VIII for U.S. pressure equipment, AWS D1.1 for structural welding, API 510/570/653 for in-service petroleum equipment, or the matching EN/ISO standard for European and international work.
Standard Code
AWS D1.5
Organization
AWS
Methods Covered
4 method(s)
Industries
2 sector(s)
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