Surface inspection

Reliably evaluate surface conditions – making quality visible

The surface of a component often directly influences its function, service life, or visual appearance. Damage, machining marks, or surface defects can lead to increased wear, corrosion, or customer complaints.

As part of surface inspection, visible deviations are systematically assessed. Depending on requirements, the inspection is performed manually or fully automated – either as a random sample or as a 100% inspection.

Surface inspection is often the first inspection step within a tiered quality concept.

Which characteristics are inspected?

The following properties, among others, can be evaluated as part of surface inspection:

• Scratches, scuffs, or indentations
• Machining marks or signs of grinding burn
• Damage or material spalling
• Irregularities in coatings or surface structures

The evaluation is based on defined defect catalogs and agreed-upon quality criteria.

Inspection methods used

Surface inspection can involve various methodological approaches:

• Visual testing (VT) – for direct visual assessment of surface features
• Fully automated camera inspection – for reproducible series inspection with image processing
• Penetrant testing (PT) – for suspected fine, surface-open cracks
• Magnetic particle testing (MT) – for ferromagnetic materials with crack-related issues

Depending on the inspection objective, surface inspection can be combined with additional non-destructive testing methods.

Typical applications of surface inspection

Surface inspection is used in particular:

• In incoming goods inspection
• During series production
• In safe-launch phases
• Prior to further processing or coating
• As part of complaint handling

Depending on requirements, the inspection is performed manually, semi-automatically, or fully automatically.

Industries and application areas of surface inspection

Surface inspection is relevant across various industries, including:

• Automotive and supplier industry
• Aerospace
• Machinery and plant engineering
• Medical technology
• Electronics industry
• Metal processing

The specific design of the inspection depends on the component, accessibility, and the respective quality requirements.

Conducting surface inspection at Technomix

Surface inspection is performed based on defined inspection criteria, defect catalogs, and agreed-upon acceptance limits. Depending on the component and quantity, manual visual testing or automated camera systems are used.

For series production applications, automated inspection systems with integrated image processing are available to inspect high volumes in a reproducible and documentable manner.

Organizational integration takes place within the framework of our quality management system in accordance with DIN EN ISO 9001.