ISO 15608:2025

Overview

ISO 15608:2025 – Welding - Grouping system for metallic materials is an international standard developed by ISO that provides a uniform system for grouping metallic materials for welding. The standard is applicable to a broad range of metals and alloys, including steels, aluminium, copper, nickel, titanium, zirconium, cast irons, and cobalt alloys. In addition to welding, ISO 15608:2025 is intended for use in related processes such as heat treatment, forming, and non-destructive testing, making it an essential reference for material grouping across multiple sectors.

This ISO standard facilitates consistency and clarity when selecting materials for various welding and allied operations. By standardizing how materials are classified, it supports safer, more reliable fabrication, quality assurance, and compliance with global industry requirements.

Key Topics

• Uniform Grouping System
  Establishes a logical system for classifying a wide spectrum of metallic materials based on their composition and characteristics relevant to welding.

• Applicable Materials
  The grouping system covers:

  • Steels
  • Aluminium and aluminium alloys
  • Copper and copper alloys
  • Nickel and nickel alloys
  • Titanium and titanium alloys
  • Zirconium and zirconium alloys
  • Cast irons
  • Cobalt alloys

• Cross-Process Relevance
  While optimized for welding, the standard’s grouping is also valuable for heat treatment, forming, and non-destructive testing, providing a unified structure for several technical operations.

• Reference to Regional Standards
  Addresses alignment with European, American, and Japanese material grouping technical reports, ensuring global compatibility and understanding.

Applications

ISO 15608:2025 is widely used by:

• Manufacturers and Fabricators
  It aids in the correct selection and matching of metals during welding, contributing to process efficiency and structural integrity.

• Quality Assurance and Inspection
  Standardized grouping supports quality control, inspection planning, and non-destructive testing. It simplifies the process of verifying material compatibility and conformance.

• Documentation and Certification
  Enables uniform recording of welding qualifications, procedure specifications, and material traceability in compliance with international codes and norms.

• Training and Education
  Serves as a foundational reference for technical training programmes, ensuring consistency in the interpretation of metallurgical grouping across organizations and countries.

• Special Processes
  Provides clarity for selecting materials for heat treatment cycles, forming operations, and testing requirements.

Related Standards

Enhancing its value, ISO 15608:2025 references and aligns with several other standards and technical reports, particularly for international compatibility:

• ISO/TR 20172 – Welding: Grouping systems for materials – European materials
• ISO/TR 20173 – Welding: Grouping systems for materials – American materials
• ISO/TR 20174 – Welding: Grouping systems for materials – Japanese materials

Organizations working with metallic materials and welding processes may need to reference these documents to ensure full compliance and harmonization in global projects.

Practical Value

By using ISO 15608:2025, professionals in welding, fabrication, and testing benefit from:

• Reduced ambiguity in material specification
• Streamlined welding qualification processes
• Improved global trade and project interoperability
• Enhanced safety and performance documentation

ISO 15608:2025 stands as a cornerstone standard for material grouping in welding and allied industries, promoting efficiency, safety, and consistency worldwide.