ISO 17779:2021

Overview

ISO 17779:2021 - "Brazing - Specification and qualification of brazing procedures for metallic materials" - defines requirements for creating, testing and qualifying brazing procedures used to join metallic materials. The standard covers preparation and brazing of test pieces, required examinations and tests, essential variables and their qualified ranges, acceptance criteria, and documentation formats including the preliminary brazing procedure specification (pBPS), brazing procedure qualification record (BPQR) and the qualified brazing procedure specification (BPS). It excludes testing of residual stresses, corrosion resistance and impact properties.

Key topics and technical requirements

• Scope of processes: Applies to a wide range of brazing processes per ISO 857-2 / ISO 4063 with local and global heating, including:
  • Infrared, flame/torch, laser, electron beam, induction, resistance, diffusion, furnace, vacuum, dip-bath, salt-bath, flux bath, immersion and arc weld brazing.
• Test pieces & specimens: Guidelines for representative test-piece designs (lap, butt, sleeve), sizing to allow required destructive and non‑destructive tests, and number of sections/specimens.
• Examination & testing: Minimum testing per EN 12797 and EN 12799 - visual inspection, metallographic examination, and mechanical tests (bend, peel, shear, transverse tensile as applicable). Acceptance levels and re‑testing rules are specified.
• Essential variables: Defines variables that affect procedure qualification (process type, product type, joint type, parent material groups, filler metal/flux, dimensions, flow direction, post‑braze heat treatment, manufacturer-related parameters) and their allowable ranges.
• Documentation: Requires a pBPS for initial specification, a BPQR recording qualification data, and a qualified BPS for production use to ensure repeatability and traceability.
• Quality provisions: General quality requirements are given (informative Annex A); brazing procedure tests must be witnessed by an examiner or examining body.

Practical applications

ISO 17779 is used to:

• Qualify and control repeatable brazing procedures for production brazing of metallic assemblies.
• Define test regimes and acceptance criteria for new brazing methods or materials.
• Document and transfer qualified procedures (BPS/BPQR) between workshops and clients.
• Support quality assurance, procurement specifications and regulatory compliance for brazing operations.

Who should use this standard

• Brazing engineers and technicians preparing procedure specifications
• Quality managers and inspection bodies overseeing brazing qualification
• Manufacturers and workshops producing brazed assemblies
• Examiners and testing laboratories conducting brazing procedure tests

Related standards

Normative and referenced documents include: ISO 857-2, ISO 4063, ISO 13585, ISO 17672, ISO 18279, ISO 18496, and European standards EN 12797 / EN 12799. Note: aerospace brazing is addressed separately (e.g., ISO 11745).

Keywords: ISO 17779, brazing procedures, brazing qualification, BPS, BPQR, brazing tests, metallic materials, brazing standard.