Overview
EN ISO 14373:2024 - Resistance welding - Procedure for spot welding of uncoated and coated low carbon steels - defines procedural requirements for resistance spot welding assemblies made from uncoated and metallic‑coated or weldable non‑metallic‑coated low‑carbon steels. It is the third edition (ISO 14373:2024) and supersedes EN ISO 14373:2015. The standard covers joints of two or three sheets where single‑sheet thicknesses are between 0.4 mm and 3.0 mm and thickness ratios between sheets do not exceed 3:1.
Key topics and technical requirements
- Material and coatings: Applicable to uncoated and a range of metallic or weldable non‑metallic coatings; the 2024 edition adds new coating types.
- Thickness and stack-up limits: Single sheet thickness 0.4–3.0 mm; sheet thickness ratio ≤ 3:1.
- Equipment scope: Applies to pedestal welders, portable welding guns, automatic/robotic welding equipment, multi‑spot machines and robotic welding machines.
- Weld assessment and testing: Includes requirements for weldability testing, production testing and frequency of testing. Cross‑tension strength (CTS) values are explicitly included in this edition; tensile shear guidance has been revised.
- Electrodes and tooling: Requirements for electrode materials, dimensions and cooling are specified.
- Quality and acceptance: Criteria for weld diameter, weld strength, visual examination, distortion limits and failure descriptions are provided.
- Informative guidance: Annex A (equipment recommendations), Annex B (typical spot‑welding conditions) and Annex C (partial list of applicable steel types) support practical implementation.
- Normative references: Linked standards include ISO 10447, ISO 15609‑5, ISO 15614‑12 and ISO 17677‑1.
Practical applications and users
EN ISO 14373:2024 is designed for practical use in industries and processes that rely on resistance spot welding of low‑carbon steels, including:
- Automotive body assembly and component manufacturing
- Appliance and general sheet‑metal fabrication
- Robotic and automated manufacturing lines
- Welding procedure developers and welding engineers
- Quality assurance, inspection and testing laboratories
- Standards bodies and compliance teams
Users will apply this standard to develop welding procedure specifications (WPS), qualify equipment and tooling, set production test regimes, and verify weld quality for coated and uncoated steel assemblies.
Related standards
Relevant referenced standards for testing and procedure specification:
- ISO 10447 - Testing of welds: peel and chisel testing
- ISO 15609‑5 - Welding procedure specification: Resistance welding
- ISO 15614‑12 - Welding procedure test: Spot, seam and projection welding
- ISO 17677‑1 - Resistance welding vocabulary (spot, projection and seam)
EN ISO 14373:2024 is essential when you need an up‑to‑date, harmonized procedure for resistance spot welding of low‑carbon steels in automated and manual production environments.
