Overview
EN ISO 18275:2026 sets out the classification requirements for covered electrodes and deposited metal used in manual metal arc welding of high-strength steels. Published by CEN, this international standard defines classification methods and designations for electrodes intended for welding steels with a minimum yield strength above 500 MPa or a minimum tensile strength above 570 MPa.
By aligning classification systems for these covered electrodes, EN ISO 18275:2026 helps ensure welding quality and safety across global industries that rely on high-strength steel structures and components.
Key Topics
- Scope and Classification Systems:
The standard provides a dual-system approach for classification:
- System A: Based on yield strength and an average impact energy of 47 J for the all-weld metal.
- System B: Based on tensile strength and an average impact energy of 27 J for the all-weld metal.
- Suffixes "System A" and "System B" in the standard indicate which requirements apply to each system.
- Test Requirements:
Mechanical testing in both as-welded and post-weld heat-treated conditions is specified, ensuring electrodes meet being fit for demanding applications.
- Chemical Composition and Mechanical Properties:
Covered electrodes are categorized by the mechanical properties (such as yield or tensile strength and elongation), impact toughness, and chemical composition of the weld metal.
- Electrode Covering and Weld Conditions:
The type of electrode covering (e.g., basic or cellulosic) and whether the weld undergoes post-weld heat treatment are included in the designation.
- Designation System:
A detailed symbol-based system covers product type, mechanical properties, chemical composition, covering type, post-weld heat treatment, electrode efficiency, welding position, and diffusible hydrogen content.
Applications
EN ISO 18275:2026 enables manufacturers, welding engineers, and inspectors to:
- Select Suitable Electrodes:
The classification system assists in choosing the correct covered electrodes for manual metal arc (MMA) welding based on required mechanical properties and welding conditions for high-strength steels.
- Weld High-Strength Steels Safely:
Ensures electrodes and welds deliver reliable strength, toughness, and performance - essential in construction, heavy machinery, bridges, shipbuilding, pipelines, and pressure vessels.
- Meet Regulatory and Customer Requirements:
Harmonizes electrode classification globally, supporting compliance with procurement and quality assurance in supply chains across different markets and jurisdictions.
- Support Quality Control and Documentation:
The standard’s symbol system simplifies communication about material and process suitability on packages, certifications, and technical documentation.
Related Standards
Several other international standards are relevant to the selection, testing, and application of welding consumables:
- ISO 2560: Welding consumables - Covered electrodes for manual metal arc welding of non-alloy and fine grain steels - Classification
- ISO 544: Welding consumables - Technical delivery conditions for filler materials and fluxes
- ISO 2401: Determination of efficiency, metal recovery, and deposition coefficient
- ISO 3690: Determination of hydrogen content in arc weld metal
- ISO 6847: Deposition of a weld metal pad for chemical analysis
- ISO 6947: Welding positions
- ISO 14344: Procurement of filler materials and fluxes
Practical Value
Adoption of EN ISO 18275:2026 improves quality, safety, and interoperability in welded steel structures requiring high strength and impact resistance. The standard’s flexible classification system accommodates regional and market preferences while ensuring weld performance criteria are met. This makes it an invaluable tool for anyone specifying, purchasing, or inspecting welding consumables for critical infrastructure and engineering applications.
Keywords: EN ISO 18275:2026, high-strength steel, covered electrodes, manual metal arc welding, welding consumables classification, mechanical properties, electrode selection, welding standards, CEN, ISO 18275.