Overview - ISO 4063:2023 (Welding nomenclature and reference numbers)
ISO 4063:2023 establishes a standardized nomenclature and reference-numbering system for welding, brazing, soldering and thermal cutting processes. The fifth edition adds processes for the welding and thermal joining of plastics and updates previous editions. The system assigns a maximum three‑digit reference number to each process (one‑digit main process, two‑digit group, three‑digit sub‑group) and is intended to support computerization, drawings, working papers and welding procedure specifications (WPS).
Examples:
- ISO 4063 – 48 (Cold pressure welding)
- ISO 4063 – 522 + 15 (Gas laser welding combined with plasma arc welding)
- ISO 4063 – 131‑D (MIG welding with short‑circuit transfer)
Key topics and technical requirements
- Process numbering structure: main processes (1 digit), groups (2 digits), sub‑groups (3 digits); max three digits per process.
- Designation format: use “ISO 4063 – ” for full identification.
- Hybrid processes: combine process numbers with “+” when multiple processes operate simultaneously in the same area.
- Process variants: Annex A allows variant codes (letters/numbers) for transfer modes, multi‑electrode setups and other variants (e.g., transfer mode codes B, D, G, S, P).
- Scope coverage: welding (arc, resistance, friction, beam, plastics-specific, etc.), thermal cutting/gouging, brazing, soldering and weld‑brazing.
- Informative annexes: process variants, replaced/obsolete processes, and a list of US acronyms for cross‑reference.
- Intended use: to enable uniform international designation of processes for documentation, automation and specification drafting.
Practical applications and users
ISO 4063:2023 is practical for:
- Welding engineers and metallurgists - consistent process labelling in WPS and procedure specifications.
- Designers and drafters - standardized notation on engineering drawings and BOMs.
- Quality managers and inspectors - unambiguous process identification for inspection and certification.
- Software and PLM developers - database fields, CAD/PLM integrations and electronic records that require standard process codes.
- Procurement and training - clear purchase specifications and curriculum mapping for vocational training.
Common use cases: preparing WPS, tagging processes in CAD drawings, automating manufacturing instructions, creating searchable process libraries and cross‑referencing US/ISO terminology.
Related information
- Prepared by ISO/TC 44 (Welding and allied processes), Subcommittee SC 7 (Representation and terms).
- Annexes provide variant coding and mappings to replaced/obsolete processes and US acronyms for easier international alignment.
Keywords: ISO 4063:2023, welding nomenclature, reference numbers, welding processes, brazing, soldering, thermal cutting, welding procedure specifications, plastics welding, process numbering.
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