How Automated Eddy Current Testing Improves Aerospace Billet Inspection

Aerospace billets are the starting point for many critical components. Before they can be machined, forged, or transformed into finished parts, manufacturers need confidence that the material is free from surface defects that could impact downstream processing or final component performance.

What is aerospace billet inspection?

Aerospace billet inspection is the process of evaluating high-grade metal billets for surface defects such as cracks, seams, laps, and other discontinuities before machining, forging, or further processing. Inspection helps manufacturers identify material flaws early, reduce scrap and rework, and ensure compliance with quality requirements.

Surface cracks, seams, laps, and other discontinuities can occur during manufacturing, handling, or processing. If these defects are not identified early, they can lead to scrap, rework, machining delays, customer complaints, or quality issues later in production.

If you've ever been responsible for inspecting a large aerospace billet, you know the challenge.

The material is heavy. The surface area is extensive. And somewhere along that surface could be a small defect that is capable of creating a major problem downstream.

Finding that defect can feel like searching for a needle in a haystack.

Especially when you are relying on traditional inspection methods like dye penetrant testing or visual inspection. While these techniques have been used for decades, they often require significant labor, extensive handling, and a great deal of operator judgment.

A technician may spend hours preparing the billet, performing the inspection, evaluating indications, and determining whether a condition is actually rejectable. If an indication is found, additional grinding and reinspection may be required before a final decision can be made.

As they say, "time is money," and this process is often slow, repetitive, and difficult to standardize.

With production schedules tightening and customers expecting documented quality, many manufacturers are asking the same question: How can we inspect large billets faster without sacrificing confidence in the results?

Why Should You Replace Outdated Traditional Inspection Methods?

When you are producing aerospace billets or other high-value materials, every quality decision matters.

The cost of a missed defect can be high, but so can the cost of being overly conservative. A defect that escapes detection can create problems during machining, forging, heat treatment, or final assembly. At the same time, questionable indications often lead to unnecessary grinding, additional inspections, lost production time, and increased labor costs.

That creates a difficult balancing act. Traditional inspection methods were never designed for today's manufacturing demands. They depend heavily on operator judgment, require extensive manual effort, and often make it difficult to achieve consistent results from shift to shift.

Meanwhile, customer expectations continue to evolve. Aerospace manufacturers and their suppliers are increasingly expected to provide traceable inspection data, documented quality records, and objective evidence that material meets specification requirements.

Inspection teams are left asking a few critical questions:

• Are we finding the defects that matter?
• Are we spending time investigating indications that are not really defects?
• Can we inspect material faster without sacrificing quality?
• How do we document inspection results and prove compliance?

This is where automated eddy current testing changes the equation.

How Does Automated Eddy Current Testing Improve Aerospace Billet Inspections?

The new fully automated billet inspection system combines eddy current flaw detection, automatic defect marking, and digital reporting into a single turnkey solution.

Using multiple differential eddy current probes positioned along the billet surface, the system continuously scans for longitudinal, circumferential, and angled defects as the material moves beneath the inspection station. Adjustable roller assemblies accommodate slight bends and material runout, allowing the probes to maintain consistent liftoff throughout the inspection process.

As defects are detected by the system's eddy current testing technology, powered by solutions such as the DEFECTOMAT DA or STATOGRAPH CM, their locations are automatically recorded and marked with paint marking for easy identification and follow-up. Operators no longer need to search for indications after testing is complete. The areas requiring attention are clearly identified and ready for evaluation.

The inspection process is completed at speeds of up to 40mm linear travel per second in standard configuration, dramatically reducing the time required to inspect large billets when compared to traditional dye penetrant testing methods.

Perhaps most importantly, the system helps eliminate uncertainty.

Rather than relying solely on visual interpretation, defects are evaluated against predetermined inspection criteria. If a flaw meets or exceeds the defined acceptance threshold, it is detected, recorded, and marked automatically. This helps ensure that attention is focused on reportable defects rather than questionable indications.

Each billet receives a customizable inspection report documenting defect locations and inspection results. These reports can be archived, shared with customers, or used to support quality audits and traceability requirements.

The result is a streamlined inspection process that allows manufacturers to:

• Reduce inspection time from hours to minutes
• Improve inspection consistency across operators and shifts
• Detect longitudinal, circumferential, and angled surface defects
• Automatically identify and mark defect locations
• Generate digital inspection records for traceability
• Increase throughput without sacrificing quality

The system can operate in fully automated mode for maximum productivity while also allowing manual operation when required. Integrated safety features, including guards and floor sensors, help protect operators while ensuring reliable system performance.

If you are looking to modernize billet inspection, the combination of automated eddy current testing, defect marking, and digital reporting provides a faster, more repeatable alternative to traditional inspection methods.

What Should You Look for in a Modern Billet Inspection System?

Billet inspection has always been a critical part of quality assurance, but today's manufacturing environment demands more than simply finding defects.

Manufacturers are being asked to inspect more material, maintain tighter quality standards, improve traceability, and keep production moving. Traditional inspection methods, such as dye penetrant testing and visual inspection, can still provide value, but they often struggle to deliver the speed, consistency, and documentation required by modern aerospace and specialty metal producers.

Automated eddy current testing offers a different approach. By combining objective flaw detection on a larger scale, automatic defect marking, and digital reporting, manufacturers can reduce inspection time while improving confidence in their quality decisions.

If you are evaluating your current billet inspection process, consider the following questions:

• How much time is spent inspecting each billet?
• How consistent are inspection results between operators and shifts?
• Can defect locations be easily documented and traced?
• How much rework is driven by questionable indications?
• Are quality records sufficient to support customer and audit requirements?

If these questions reveal opportunities for improvement, it may be time to explore a more automated inspection strategy.

We partner with manufacturers to develop turnkey testing solutions that align with their materials, quality requirements, and production goals. Whether you are looking to replace a manual inspection process, increase throughput, improve traceability, or modernize an existing testing line, our team can help you identify the right approach for your application.

Because the goal is not simply to inspect faster. It is to make better quality decisions, reduce uncertainty, and keep material moving through production with confidence.