From Measurement to Control: Complete Quality Assurance in Shot Peening

Shot peening is often used on parts where failure is not an option: aircraft turbine blades, landing gears, automotive springs, energy components… If the intensity is too low, you risk fatigue cracks. If too high, you risk surface damage. And in many industries, you must prove that the process was correctly applied.

That’s where complete quality assurance (QA) becomes essential, not just checking results, but controlling, documenting, and tracing every step of the process.

Let’s break down the four pillars of a robust QA approach:

1. Certified Almen Strips

• Compliant with SAE J442 and AMS 2430/2432
• Controlled for flatness, hardness, and thickness
• Available with laser-printed serial numbers, flatness values, and certifications

Use laser-measured strips with traceability labels to eliminate operator error and simplify audits.

2. Digital Measurement Tools

• Almen gauges with digital readout (e.g., PA Almen Gage Industrial+)
• Resolution up to 0.0001 inch
• Built-in memory to store arc height readings and timestamps
• Some models integrate with saturation curve software

This reduces subjectivity and allows automatic data logging.

3. Saturation Curve Plotting Software

To comply with SAE J443, you need to:

• Expose strips to multiple durations
• Record arc heights
• Plot a curve
• Identify time T where arc height stabilizes

Software like PA Curve Plotter:

• Automates calculations
• Verifies 10% rule
• Generates printable or exportable reports

4. Traceability and Documentation

Full traceability means logging:

• Strip ID and supplier
• Almen gage model and calibration date
• Operator name
• Media flow, pressure, nozzle position
• Date/time of peening

These logs are essential for:

• Nadcap audits
• OEM compliance (e.g., Airbus, Boeing)
• Internal quality certifications

PA provides complete QA packages combining certified strips, gages, software, and smart valves.

1. Use certified laser-measured Almen strip
2. Mount in calibrated strip holder
3. Peen at various durations → build saturation curve
4. Measure arc height with digital gauge
5. Log all data: strip ID, arc height, time, media flow
6. Export report with signature + PDF traceability

Result: Full compliance with AMS 2430 and SAE J443 in a single digital report.

Modern industry demands:

• Repeatable results
• Process documentation
• Operator-independent procedures
• Audit-ready data

Without a complete QA chain, you are exposed to:

• Certification failure (e.g., Nadcap)
• OEM rejection
• Legal and financial risk in case of failure

Shot peening QA goes far beyond checking a single arc height. It requires:

• Reliable measurement tools
• Validated procedures
• Full traceability
   

Quality isn’t what you say, it’s what you can prove. If your QA system is incomplete, manual, or undocumented, now is the time to upgrade. Working with a peening specialist can help you.