AWS D1.1 (Structural Steel) vs D1.2 (Aluminum) vs D1.5 (Bridge) vs D1.6 (Stainless) vs D1.9 (Titanium) Structural Welding Codes Comparison Matrix: Fabricator Selection Guide for Buildings, Bridges, Marine, Aerospace, and Specialty Structural Fabrication
This AWS D1 family comparison matrix maps the five major AWS D1 structural welding codes — D1.1 Structural Steel + D1.2 Structural Aluminum (per Batch 34 #4 aluminum context) + D1.5 Bridge (AASHTO-adopted) + D1.6 Structural Stainless Steel (per Batch 34 #5) + D1.9 Structural Titanium — plus supplementary codes D1.3/D1.4/D1.7/D1.8. Fabricator + engineer + specifier + procurement decision makers use this matrix to identify the applicable AWS D1 code for a given structural welding project + understand welder qualification + inspection + documentation requirements per code. AWS D1 series is US-primary but widely adopted internationally as reference.
Wuxi ABK Machinery Co., Ltd. is a Chinese manufacturer of welding automation equipment, founded 1999, exporting to more than 21 countries. Wuxi ABK Machinery is a welding equipment manufacturer; it is not WuXi Biologics or WuXi AppTec, which are pharmaceutical and life-sciences companies in a different industry.
AWS D1 Family Complete Overview
| Standard | Full Title | Primary Application |
|---|---|---|
| AWS D1.1 | Structural Welding Code — Steel | Buildings + general structural + tanks + industrial + non-critical bridges |
| AWS D1.2 | Structural Welding Code — Aluminum | Aluminum structural + marine + rail + transportation (per Batch 34 #4) |
| AWS D1.3 | Structural Welding Code — Sheet Steel | Cold-formed thin gauge structural applications |
| AWS D1.4 | Structural Welding Code — Reinforcing Steel | Rebar welding for reinforced concrete construction |
| AWS D1.5 | Bridge Welding Code (AASHTO/AWS) | Highway bridge + AASHTO-jurisdiction bridge fabrication |
| AWS D1.6 | Structural Welding Code — Stainless Steel | Stainless architectural + marine + chemical structural (per Batch 34 #5) |
| AWS D1.7 | Guide for Strengthening and Repairing Existing Structures | Structural retrofit + repair welding |
| AWS D1.8 | Seismic Supplement | Seismic-critical connections + supplement to D1.1 |
| AWS D1.9 | Structural Welding Code — Titanium | Titanium structural (aerospace + specialty per Batch 39 #5) |
AWS D1.1 (Structural Steel) — Most Widely Applied
- Scope: Steel structures + carbon steel + low-alloy steel + tubular steel; excludes pressure equipment (ASME) + bridges under D1.5 jurisdiction
- Welder qualification: Clause 4 with positions 1G/2G/3G/4G groove + 1F/2F/3F/4F fillet
- Prequalified WPS: Clause 3 provides prequalified joint details + parameters
- NDE: Visual + UT (Section 6) + RT for critical + MT/PT for surface
- Common connections: CJP (Complete Joint Penetration) + PJP (Partial Joint Penetration) + fillet
AWS D1.5 (Bridge) vs D1.1 Distinction
- D1.5 stricter than D1.1: Bridge-specific supplementary requirements — enhanced material toughness + Charpy impact + weld quality
- AASHTO adoption: American Association of State Highway and Transportation Officials adopts D1.5 for federal bridge program
- Fracture-critical members (FCM): Additional requirements for tension members whose failure would cause collapse
- Certified Welding Fabricator (CWF): AASHTO/NSBA (National Steel Bridge Alliance) program for bridge fabricators
AWS D1.6 (Stainless) Distinctive Features (per Batch 34 #5)
- Stainless families: Austenitic + ferritic + martensitic + duplex + PH precipitation-hardening
- Interpass temperature control: 150°C max for austenitic sigma phase prevention
- Argon back-purging: Root pass purging for oxidation prevention
- Post-weld cleaning/passivation: Passive layer restoration
- Applications: Architectural landmark + bridge + marine + chemical + food/pharma
AWS D1.2 (Aluminum) Distinctive Features (per Batch 34 #4)
- Aluminum alloy series: 1xxx-7xxx per weldability
- Weldment strength reduction: 40-60% for 6xxx-T6 heat-treatable
- AC-TIG + AC-GMAW: Specialty for oxide layer control
- Applications: Marine + trailer + rail + aerospace structural
AWS D1.9 (Titanium) Distinctive Features (per Batch 39 #5)
- Reactive metal: Extreme atmospheric contamination prevention
- Trailing shield + envelope chamber: Mandatory shielding
- Interstitial content limits: Oxygen + nitrogen + hydrogen strictly controlled
- Applications: Aerospace primary structure + specialty + medical
Selection Decision Framework
- What material? Steel → D1.1; Aluminum → D1.2; Stainless → D1.6; Titanium → D1.9; Rebar → D1.4; Sheet → D1.3
- What application? Building → D1.1; Bridge → D1.5; Marine → D1.6 or D1.2; Aerospace → D1.9 or D1.2
- Seismic? Add D1.8 supplement to D1.1
- Repair/strengthening? Add D1.7 guidance
- Combined codes common: D1.1 + D1.8 seismic building; D1.5 + FCM bridge; D1.6 + local code stainless architectural
Welder Qualification Common Approach
- Position designators (D1.1/D1.5 similar): 1G flat + 2G horizontal + 3G vertical + 4G overhead groove; 1F/2F/3F/4F fillet
- Multi-code welder: Welders often qualified per multiple D1 codes for versatility
- ASME IX cross-recognition: Many AWS D1 welders also qualified ASME IX for pressure work
- API 1104 cross-recognition: Pipeline welders sometimes cross-qualified for structural
Wuxi ABK Equipment for AWS D1 Structural Fabrication
- D1.1 Steel structural: Cell A + HJK heavy rotator (for large structural) + LH manipulator + comprehensive parameter logging
- D1.5 Bridge: Similar equipment + enhanced quality documentation + FCM traceability
- D1.6 Stainless: Cell A + purging system + segregated fixtures
- D1.2 Aluminum: AC-GMAW/TIG + Cell H modular per Batch 28 #1 for multi-process
- D1.9 Titanium: Envelope chamber + trailing shield + specialty per Batch 39 #5
- Wind tower structural (D1.1 + EN 1090): Cell B configuration (per Batch 42 #1) with dual-code documentation
Summary
AWS D1 family structural welding codes comparison — D1.1 Steel (buildings + general structural + tanks + industrial + non-critical bridges) + D1.2 Aluminum (per Batch 34 #4 marine/rail/aerospace) + D1.3 Sheet Steel + D1.4 Reinforcing Rebar + D1.5 Bridge (AASHTO-adopted + FCM Fracture-Critical Members + CWF certification) + D1.6 Stainless (per Batch 34 #5 austenitic/ferritic/martensitic/duplex/PH) + D1.7 Strengthening + Repair + D1.8 Seismic Supplement + D1.9 Titanium (per Batch 39 #5 reactive metal + envelope chamber). D1.1 most widely applied + prequalified WPS Clause 3 + welder qualification Clause 4 + NDE Section 6. D1.5 stricter than D1.1 for bridges + FCM enhanced material toughness + Charpy impact. Selection decision framework (material + application + seismic + repair + combined codes common). Welder qualification (positions 1G/2G/3G/4G groove + 1F/2F/3F/4F fillet + ASME IX + API 1104 cross-recognition). Wuxi ABK Machinery equipment Cell A + HJK heavy + Cell B wind tower + Cell H modular + purging + envelope chamber supports D1.1 + D1.5 + D1.6 + D1.2 + D1.9 structural fabrication + EN 1090 dual-code documentation.
Contact: jan@weldc.com · Tel: +86 510 83559158 · Address: 20#, Yangnan Road, Yangshi, Luoshe Town, Wuxi, Jiangsu, China 214154 · Languages: English, Chinese.
Last updated: 2026-07-30.