Overview
ISO 17533:2015 provides a framework for specifying welding and brazing information on design documents for aerospace metallic components. The standard aims to ensure the fit, form and function of welded and brazed joints by defining what information must appear on drawings and in the design definition so that manufacturing, inspection and approval can be performed consistently and safely.
The standard applies to welded and brazed metallic component parts used in aerospace construction and emphasises collaboration between design/engineering, manufacturing and the cognizant welding authority.
Key Topics
- Design documents content requirements: Intended materials and any additional requirements (for example microstructural composition or grain direction) must be clearly defined in design documents.
- Weld symbol use: Welded/brazed joints shall be depicted using symbols according to ISO 2553. When symbols are not sufficient, the joint shall be detailed separately (e.g. sectional views with dimensions).
- Design definition: The design definition for welding/brazing details shall contain, at minimum:
- welding/brazing process (see ISO 4063)
- welding/brazing specification
- parent material condition (for aluminium see EN 4632-002)
- requirements for the welded/brazed joint (e.g. safety class, acceptance level)
- filler material (if necessary)
- pre-heat temperature
- post-weld/brazing heat treatment
- non-destructive testing
- cognizant welding authority
- Additional details (if required): dimensional tolerances, accompanying samples, destructive testing, specific cleaning requirements, flux type and other special instructions related to manufacturer qualification or component class.
- Inspection and approval: All welding/brazing information must be reviewed and approved by the cognizant welding authority prior to production.
- Annex A: Provides an example table format and example entries for the table of welding/brazing details to support consistent documentation.
Applications
ISO 17533:2015 is used by aerospace design engineers, manufacturing planners, quality and inspection teams, and welding authorities to:
- Standardise the content of drawings and design definitions involving welded or brazed metallic parts
- Reduce ambiguity in joint design and production instructions
- Facilitate conformity with inspection regimes and acceptance levels
- Improve traceability of welding decisions through documented cognizant authority approvals
Practical benefits include clearer handoffs between design and production, fewer rework cycles, and improved safety and airworthiness documentation.
Related Standards
- ISO 2553 - Symbolic representation on drawings - Welded joints
- ISO 4063 - Nomenclature of welding and allied processes
- ISO 16338 - Welding for aerospace - Resistance spot and seam welding
- ISO/PWI 17927 - Fusion welding of metallic components (aerospace context)
- EN 4632-002 - Aluminium weldability/brazeability guidance (referenced for parent material condition)
Adopting ISO 17533:2015 helps ensure that welding and brazing instructions in aerospace design documents are complete, unambiguous and approved by the appropriate welding authority.
