Overview
ISO 15609-3:2004 - "Specification and qualification of welding procedures for metallic materials - Welding procedure specification - Part 3: Electron beam welding" defines the required content of a Welding Procedure Specification (WPS) for electron beam welding (process number 51 per ISO 4063). The standard lists the variables that influence weld quality and properties and provides a structured template (Annex A) for documenting an electron beam welding procedure.
Key topics and requirements
The standard focuses on practical, traceable WPS content. Important technical topics include:
- WPS identification and manufacturer data: WPS ID, manufacturer, reference to WPQR or other qualification records.
- Equipment details: electron gun type, cathode type, unique equipment ID, and any filler feeding system layout.
- Parent materials and dimensions: material designation, product form (forged/cast/rolled), thickness ranges, and outside diameters for cylindrical pieces.
- Joint design and preparation: sketches/dimensions, surface finish, cleaning, degreasing and any shielding requirements.
- Welding technique and passes: tacking pass, welding pass, cosmetic pass (defocused/oscillating beam).
- Welding parameters:
- Electrical: accelerating voltage (kV), beam current (mA) (including pulse parameters), focusing lens current (A) or focus setting, beam deflection/oscillation (DC/AC, shape, frequency, amplitude), overlap, slope up/down and slope profile.
- Mechanical: travel direction, surface travel speed, travel speed ramping, wire/filler feed rate and position.
- Environmental/equipment: working distance (mm), gun pressure and chamber pressure (Pa or mbar).
- Positioning and fixturing: applicable welding positions per ISO 6947, jigs/fixtures, back/front supports and demagnetization procedures (if required).
- Thermal treatments and post-operations: preheating, post-heating, post-weld heat treatment (temperatures and hold times), and any mechanical/chemical operations after welding.
Ranges and tolerances for parameters should be specified where appropriate. Annex A provides an example WPS format to guide documentation.
Applications and users
ISO 15609-3:2004 is used by:
- Welding engineers and procedure writers creating qualified WPS for electron beam welding
- Quality managers and QA/QC professionals in industries requiring documented welding control
- Manufacturers and fabricators in aerospace, automotive, medical devices, energy, defense and research labs who use electron beam welding
- Inspectors and auditors verifying conformance to standardized process documentation
The standard helps ensure repeatable weld quality, traceability, and compliance with customer or regulatory requirements.
Related standards
Keywords: ISO 15609-3:2004, electron beam welding, WPS, welding procedure specification, beam current, accelerating voltage, working distance, beam deflection, welding parameters.