AWS D1.1 vs ISO 3834: A Welding Standards Buyer's Guide

Two different kinds of standard

AWS D1.1 (Structural Welding Code — Steel) is a technical code that defines how structural steel welds must be designed, qualified, executed and inspected. ISO 3834 is a quality-management standard for welding — it certifies that a company's welding processes are controlled, rather than specifying weld details. In short: AWS D1.1 governs the welds; ISO 3834 governs the welding organisation.

What AWS D1.1 specifies

AWS D1.1 covers weld joint design, prequalified procedures, welder qualification, acceptance criteria and inspection for structural steel. It's widely specified across the Gulf for buildings, bridges and structures, and is closely aligned with AISC steel construction practice.

What ISO 3834 specifies

ISO 3834 sets quality requirements for fusion welding — covering procedures, welder qualification records, equipment, traceability and inspection management. It's often required alongside EN 1090 for structural steelwork destined for European-specified projects.

Which should your project specify?

For American/AISC-aligned structures, AWS D1.1 is the natural fit. For European/EN-aligned projects, ISO 3834 + EN 1090 is typically required. Many capable fabricators work to both. The key is that your fabricator can produce qualified procedures and welder certs for whichever code your consultant specifies.

How we comply

Fabrication Masters welds structural steel to AWS D1.1 with qualified procedures and coded welders, backed by NDT. Explore our welding service or structural steel fabrication.