DIN EN ISO 148-2 — Verification of Charpy Pendulum Impact Testing Machines

DIN EN ISO 148-2: Metallic materials — Charpy pendulum impact test — Part 2: Verification of testing machines

DIN EN ISO 148-2 is the German adoption of the EN ISO edition of ISO 148-2. It addresses verification of Charpy pendulum impact testing machines (Pendelschlagwerke), including evaluating key machine components and the accuracy of absorbed-energy readings.

In practice, it is used to establish and maintain confidence that a Charpy impact tester is performing correctly before it is used for materials testing to ISO 148-1 or other Charpy-based requirements.

Quick definition

Document type: Machine verification / calibration and performance verification standard for Charpy pendulum impact testing machines.

Primary purpose: Defines direct and indirect verification approaches to assess whether a pendulum impact tester is suitable for Charpy absorbed-energy measurements.

Used with: Commonly referenced alongside ISO 148-1 (Charpy test method) and ISO 148-3 (reference test pieces for indirect verification / reference machine considerations).

What This Standard Covers

DIN EN ISO 148-2 covers verification of pendulum impact testing machines used for Charpy testing of metallic materials. It addresses verification of the machine and its critical parts, the overall impact energy performance, and the accuracy of results produced by the machine.

Verification approach: The standard describes two complementary verification methods.

• Direct verification (static): Measurement and checking of critical machine characteristics using measurement equipment that is traceable to national or international standards.
• Indirect verification (dynamic): Use of reference test pieces to check performance at different points on the energy scale (requirements for reference test pieces are addressed in ISO 148-3).

Important point for labs: Conformance is tied to completing both direct and indirect verification and meeting the relevant requirements for each.

Why This Standard Matters in Testing

Charpy absorbed energy is often used for material qualification, comparison of heat treatments, and process control. When machine losses, geometry deviations, or scale/measurement issues are present, the reported absorbed energy can shift in ways that are not caused by the material itself.

DIN EN ISO 148-2 gives labs a structured, repeatable way to verify a pendulum impact tester so results are defensible for internal QA/QC, customer specifications, and regulated or audited testing environments.

Common Materials, Product Types, or Applications Covered

DIN EN ISO 148-2 is used in connection with Charpy testing of metallic materials. Typical application areas include:

• Steel and cast products where impact toughness requirements are specified
• Weld procedure qualification and production weld verification programs that include Charpy impact requirements
• R&D and failure-analysis work where Charpy energy is used as a comparative toughness indicator
• General industrial quality control programs using Charpy testing equipment

This standard is primarily about the test machine, so it applies broadly wherever Charpy pendulum impact testers are used rather than being limited to a single alloy class.

Common Test or Verification Workflow

A typical DIN EN ISO 148-2 workflow centers on keeping the impact tester in a qualified state across its operating range.

Common workflow steps:

• Identify the pendulum impact tester configuration(s) in use (capacity range and striker/hammer setup)
• Perform direct verification checks of key machine characteristics using appropriate measurement tools
• Perform indirect verification using suitable reference test pieces to check energy-scale performance
• Document verification results and schedule ongoing verifications at an interval consistent with lab practice and any applicable requirements

Practical caution: Indirect verification depends on having appropriate reference test pieces and following the relevant acceptance rules; this can influence lead time and budgeting for compliance activities.

Equipment Commonly Used for This Standard

Because DIN EN ISO 148-2 focuses on verification of Charpy pendulum impact machines, equipment needs typically include both the impact tester itself and the tools/materials needed to verify it.

Common equipment:

• Charpy pendulum impact testing machine (pendulum impact tester) suitable for metallic materials testing
• Striker/hammer configurations applicable to the machine and test program
• Measurement tools and gauges used during direct verification (for checking critical dimensions and machine characteristics)
• Reference test pieces used for indirect verification (often managed as controlled materials, with traceability documentation)

If you are selecting a new Charpy impact tester or planning a verification-ready setup (including reference specimens and verification tooling), you can request a detailed quote matched to your capacity range, data requirements, and verification workflow.

How to Read This Designation or Revision

DIN EN ISO 148-2 indicates a German (DIN) adoption of the European (EN) adoption of the International Standard (ISO) for ISO 148-2.

Part 2 identifies this document as the machine verification part of the ISO 148 Charpy pendulum impact test series (with related parts addressing the test method and reference test pieces).

Edition/date sensitivity: Requirements for verification frequency, acceptance criteria, and documentation can depend on the cited edition. When a purchase order, customer specification, or lab procedure references “DIN EN ISO 148-2,” it is best practice to confirm the exact year/date of issue being invoked.

Related Standards, Methods, or Frameworks

DIN EN ISO 148-2 is commonly used alongside other documents in the ISO 148 Charpy series.

Often paired with:

• ISO 148-1: Charpy pendulum impact test method (used when running Charpy tests on metallic specimens)
• ISO 148-3: Reference test pieces and related requirements supporting indirect verification activities

When a testing program includes both the Charpy method and machine verification requirements, ensure the machine verification plan aligns with the specific Charpy testing procedure(s) and reporting expectations used in your lab.

Get help specifying a verification-ready Charpy impact setup

If you are planning a new pendulum impact tester purchase, upgrading instrumentation, or building a lab procedure around DIN EN ISO 148-2 verification activities, contact our team to discuss capacity range, striker configuration, documentation expectations, and the practical items needed to support both direct and indirect verification.