Aerospace welding guide covering AWS D17.1 specifications, material requirements, quality standards, and processes for aviation and space applications. TIG, electron beam, and laser welding for aerospace alloys.
Aerospace welding operates under the tightest quality standards in the industry. Every weld is documented, inspected, and traceable to the specific welder, procedure, filler lot, and shielding gas batch. A single porosity inclusion that passes visual on a structural steel job would reject an aerospace component.
AWS D17.1 governs fusion welding for aerospace applications. It defines four weld classes based on criticality, from Class A (primary structure, no detectable defects) through Class D (non-critical). Most airframe and engine component welds fall into Class A or B, requiring radiographic or fluorescent penetrant inspection on every joint.
Nadcap accreditation is the facility-level quality system that aerospace primes like Boeing, Airbus, and Lockheed require from their welding subcontractors. It covers process control, welder qualification, equipment calibration, and documentation.
Titanium is used extensively in airframes and engine components for its strength-to-weight ratio. TIG welding titanium requires complete inert gas coverage on the weld, heat-affected zone, and backside of the joint until the metal cools below 800F. Trailing shields and enclosed purge chambers are standard. Any discoloration beyond light straw indicates contamination and rejection.
Nickel superalloys like Inconel 625 and 718 go into turbine engines, exhaust systems, and high-temperature structures. These alloys are weld-sensitive, requiring controlled heat input and often post-weld heat treatment to restore mechanical properties.
Aluminum alloys in aerospace include 2219, 5083, and 6061. TIG with AC current and proper balance control manages the oxide layer. Cleanliness is absolute, not optional.
For general welding career paths in aerospace, see our career paths section. Back to welding applications.
Aerospace welding requirements including AWS D17.1, NadCap accreditation, process control documentation, material traceability, welder certification, and clean room standards.
AWS D17.1 aerospace welding standard breakdown. Covers scope, weld classification (Class A-D), filler metal rules, NDE requirements by class, and how D17.1 differs from D1.1.
How to TIG weld 4130 chromoly steel tubing for aircraft. Covers filler metal selection (ER70S-2 vs ER80S-D2), rosette technique, cluster weld joints, and AWS D17.1 acceptance.