Overview - EN ISO 10447:2022 (Resistance welding: Peel & chisel testing)
EN ISO 10447:2022 is the CEN-adopted international standard that specifies procedures and recommended tooling for peel and chisel testing of resistance spot and embossed projection welds. It applies to welds made in two or more sheets with thicknesses from 0.5 mm to 3.0 mm. The standard’s primary aims are to determine weld size and failure mode (destructive tests) and to provide guidance for non‑destructive verification using chisel tests.
Key topics and technical requirements
- Scope and applicability
- Resistance spot and projection welds in multi-sheet assemblies (0.5–3.0 mm).
- Terminology
- Terms and definitions follow ISO 17677‑1 (spot, projection and seam welding vocabulary).
- Test specimens
- Use actual components for production quality control; use matched test pieces for parameter development while accounting for shunt/impedance effects.
- Chisel testing
- Two main types: destructive (to produce plug or interfacial fracture for weld‑size measurement) and non‑destructive (verification without fracturing the weld).
- Chisel geometry and selection depend on weld diameter, plate thickness and whether the test is destructive or non‑destructive (illustrated designs and tables provided).
- Factors influencing results: chisel shape/condition, hammer type, specimen thickness and positioning, insertion depth.
- Caution recommended when using non‑destructive chisel tests on high‑strength steels; verify by destructive tests before production use.
- Peel testing
- Manual and mechanized peel tests to separate sheets and expose fracture mode and plug size.
- Manual methods use vice, roller (recommended 30 mm diameter for sheets ≤1 mm), pliers or pincers. Mechanized peel testing is covered by ISO 14270.
- Recording & reporting
- Measure weld size and record failure modes; test reporting requirements are specified.
Practical applications and target users
- Useful for welding engineers, quality control technicians, metallurgists, and inspectors involved in resistance welding operations.
- Industries: automotive, electrical appliances, general fabrication and any sector that uses spot or projection resistance welding where verification of joint integrity and weld sizing is required.
- Typical use cases: production quality control, incoming inspection, weld parameter development, and validation of non‑destructive inspection routines.
Related standards
- ISO 17677‑1 - vocabulary for spot, projection and seam welding (terms and definitions).
- ISO 14270 - mechanized peel testing for seam welds (preferred method for certain applications).
Keywords: EN ISO 10447:2022, resistance welding, peel test, chisel test, spot weld testing, projection welds, weld size, failure mode, non‑destructive testing.
