Overview
EN ISO 5182:2016 (ISO 5182:2016) specifies the required characteristics of materials used for resistance welding electrodes and ancillary equipment - components that carry welding current and transmit force to the workpiece. Adopted by CEN and published as a European Standard, it supersedes EN ISO 5182:2009 and is the international reference for electrode material classification, properties and test methods.
Key topics and technical requirements
- Scope and classification
- Materials are grouped into Group A (copper and copper alloys), Group B (sintered materials) and Group C (dispersion‑strengthened copper, DSC). Examples in the standard include Cu‑ETP, CuCr1, CuCrZr, CuZr, CuCo2Be, W75Cu and other sintered tungsten/copper composites.
- Material properties
- Minimum hardness and electrical conductivity requirements are specified (see Table 3 in the standard). Hardness requirements relate to the intended electrode function rather than general-purpose alloy specs.
- Methods of test
- Vickers hardness test: performed in accordance with ISO 6507-1, using a 300 N load (HV30).
- Electrical conductivity: measured in MS/m or %IACS, typically using ASTM E1004 (eddy‑current method) or another mutually agreed method.
- Softening temperature: defined as the maximum temperature which, if maintained for 2 hours, reduces hardness by no more than 15% from the “as received” value. A formal standard test method is pending; currently agreed between supplier and purchaser when required.
- Designation and documentation
- Materials are designated by group, type and material number (for example: ISO 5182:2016 – A 2/1 for CuCr1).
- Safety note
- Alloys containing beryllium require precautions (e.g., during dry grinding or welding) to avoid inhalation of hazardous dust or fumes.
Applications and who uses this standard
- Primary users
- Electrode manufacturers, welding consumables suppliers, welding equipment designers, metallurgists, quality engineers and procurement teams specifying materials for resistance welding systems.
- Practical uses
- Selecting electrode materials for spot, projection and seam welding.
- Specifying material acceptance criteria (hardness, conductivity, softening resistance) for manufacturing and quality control.
- Comparing sintered vs. wrought electrode options (e.g., tungsten‑copper for high wear and heat resistance, CuCrZr for strength and conductivity balance).
Related standards
- ISO 6507-1 - Metallic materials - Vickers hardness test (test method)
- ASTM E1004 - Electrical conductivity measurement (eddy‑current method)
- EN ISO 5182:2009 - previous edition (superseded)
Keywords: resistance welding, electrode materials, EN ISO 5182:2016, ISO 5182, welding consumables, electrical conductivity, Vickers hardness, dispersion‑strengthened copper, sintered tungsten-copper.
