CT Scan for the Automotive Industry: Non-Destructive Component Analysis

In short: An industrial CT scan examines a component non-destructively and generates a complete 3D volume model from many X-ray projections – including all internal structures. This makes it possible to evaluate porosities, dimensional deviations, assembly conditions and defects that tactile or optical measurement technology cannot reach. Q-Tech Roding is accredited to DIN EN ISO/IEC 17025 for CT measurements.

The automotive industry operates under high technical and economic pressure: shorter development cycles, more complex components, rising quality requirements. Electromobility, lightweight construction, new materials and tightly scheduled supply chains are fundamentally changing the requirements for industrial quality assurance.

For many inspection tasks, capturing only the external geometry of a component is not enough. What often matters most are internal structures: porosities in cast components, wall thicknesses, joining and assembly conditions, warpage, inclusions or defects in areas that are not accessible tactilely or optically. This is exactly where the strength of industrial computed tomography lies.

A CT scan enables the non-destructive inspection and digitization of components. Many X-ray projections combine to create a three-dimensional volume model that makes external contours and internal structures visible and analyzable. For OEMs, suppliers, toolmakers and development departments, this creates a reliable data basis for component evaluation, defect analysis, first article inspection, tool correction and process optimization.

Q-Tech Roding supports automotive industry companies with industrial computed tomography, optical and tactile measurement technology, and metrological evaluation. As a testing laboratory accredited to DIN EN ISO/IEC 17025 for CT and CMM measurements, Q-Tech delivers traceable, verifiable measurement results for demanding inspection tasks in development and production.

Why CT Scans Are Becoming More Important in the Automotive Industry

Automotive components must be manufactured to be functional, dimensionally accurate and process-reliable. Even small deviations affect assembly, sealing, service life, safety or downstream processes. Lightweight construction, function integration and new manufacturing processes are making components structurally more demanding at the same time.

Classic measurement methods remain indispensable, but reach their limits for certain tasks. Tactile measurements capture defined points and contours very precisely but require accessible measuring surfaces. Optical 3D scans quickly deliver flat external geometries but cannot reach internal features. Industrial computed tomography complements these methods by scanning the component completely and non-destructively.

The CT scan is particularly relevant when components must not be destroyed, cut open or disassembled – for prototypes, high-value single parts, safety-relevant components, or assemblies whose assembly condition itself must be inspected.

CT, Tactile and Optical Measurement Technology in Comparison

The methods do not compete – they complement each other. The real expertise lies in choosing the right method, or the right combination of methods, for the specific inspection task.

What an Industrial CT Scan Reveals

In industrial computed tomography, the component is positioned between the X-ray source and detector and rotated during the measurement. From the recorded 2D X-ray images, the software reconstructs a three-dimensional volume model that maps density differences within the material, which is then evaluated metrologically.

Depending on the component, material, resolution and inspection goal, this can be used to analyze:

• dimensional and form deviations
• internal geometries, channels and cavities
• wall thicknesses and material distribution
• voids, porosities and inclusions
• cracks, bonding defects and structural anomalies
• assembly conditions and installation positions
• deviations between the CAD model and actual geometry
• differences between several real components

The CT scan is therefore not just an imaging method, but the basis for concrete metrological decisions. What matters is not the scan alone, but the professional evaluation of the CT data.

Benefits of CT Scanning for Automotive Components

Non-destructive inspection. The component remains intact during inspection. This makes it possible to examine prototypes, functional samples, expensive single parts and safety-relevant components without cutting them open or rendering them unusable – especially valuable for root cause analysis, series ramp-up and the evaluation of complaints.

Complete 3D data basis. A CT scan generates a complete volume model. Depending on the task, several evaluations can be derived from a single data set: nominal-actual comparison, wall thickness analysis, defect analysis, void and porosity analysis, actual-actual comparison or reverse engineering. This reduces the effort required when different questions are asked about the same component.

Early defect detection. If dimensional deviations, porosities or assembly errors are discovered late, high costs arise from rework, scrap, delivery delays or tooling changes. CT measurements make deviations visible early and narrow down causes more precisely – particularly for tool corrections, first article inspections and series ramp-ups.

Evaluation of internal structures. Cooling channels, cavities, rib structures, joining surfaces, insert parts or hidden assembly areas are not accessible from the outside. This is where CT provides information that purely external measurement technology cannot fully capture – especially for die casting, plastic components, e-mobility components, connectors, housings and assemblies.

Typical Applications in the Automotive Industry

Cast and die-cast parts. Structural components, housings, engine and transmission components, as well as components of electric drives, can exhibit porosities, voids, inclusions or local wall thickness deviations due to the manufacturing process. CT captures these features non-destructively; a porosity analysis shows location, size and function-critical relevance, supplemented by a nominal-actual comparison against tolerances.

Plastic and injection-molded parts. In housings, clips, connectors, brackets and fluid components, injection molding can cause warpage, sink marks, air inclusions, wall thickness deviations or problems with insert parts. The CT scan analyzes external and internal geometry and documents deviations between the CAD model and the real component in a traceable way – a reliable basis for tool corrections.

Electromobility and electrical components. Battery cells, battery housings, power electronics, connectors, as well as e-motor components and their short-circuit rings, place high demands on dimensional accuracy, assembly quality and material condition. CT scans reveal internal structures, joining and contact areas, component positions, deformations or defects. Which features can be reliably evaluated depends heavily on component structure, material combination, density differences and resolution – sound inspection planning is essential here.

Prototypes, first samples and series ramp-up. In development, CT provides an early data basis for design evaluation, tool optimization and design validation; real components are compared non-destructively with CAD data. In first article inspection, it supports the evaluation of dimensional, form and positional deviations as well as internal features.

Assemblies and installation control. Is a component correctly seated? Is an insert positioned correctly? Are there collisions, gaps or shifts? Installation and clearance control inspects the real assembly condition non-destructively, without disassembling – and thereby altering – the assembly.

CT Scan, Nominal-Actual Comparison and Tool Correction

One particularly important application is the nominal-actual comparison: the real component geometry from the CT scan is compared with the CAD model, and deviations are visualized in color and evaluated quantitatively. For tool making and manufacturing optimization, this representation shows not only that a component deviates, but where, in which direction, and to what extent. Tool corrections can thus be derived more precisely and iteration loops shortened.

An actual-actual comparison is also useful as a complement: several real components – from different tool cavities, batches or process parameters – are compared to assess process changes and series variation.

The methodological basis for dimensional CT measurements is set out in the VDI/VDE 2630 guideline, which defines uniform standards for measurement processes.

Not All CT Measurements Are Equal

The quality of a CT result does not depend on the device alone. What matters is component size, material density, wall thicknesses, desired resolution, scan parameters, reconstruction, segmentation and metrological evaluation. A clear conceptual distinction is important here: voxel size, achievable resolution and measurement uncertainty are not the same thing. Especially for multi-material components, very dense materials or large components, inspectability must be realistically assessed in advance.

Reliable results require a clear inspection strategy:

• Which features need to be inspected?
• Which tolerances or limits are relevant?
• Dimensional measurement, defect analysis or pure visualization?
• Is a DAkkS test report required?
• Which data formats are needed for design, QA or supplier communication?
• What resolution is technically sensible and economically reasonable?

A professionally planned CT scan does not deliver as much data as possible, but the right data for the specific inspection decision.

CT Scans at Q-Tech Roding

Q-Tech Roding offers industrial computed tomography as part of a broad metrology service portfolio: CT scans, nominal-actual and actual-actual comparisons, defect analyses, void and porosity analyses, installation and clearance control, tool corrections, reverse engineering and first article inspection reports.

For CT measurements, two accredited ZEISS METROTOM systems are available: the METROTOM 800 (130 kV X-ray tube, measuring volume up to Ø 275 × 360 mm) for smaller and less dense components, and the METROTOM 1500 (225 kV X-ray tube, measuring volume up to Ø 615 × 870 mm) for larger and denser components. Which system and measurement strategy is suitable is decided based on the specific component and inspection requirement. Evaluation is carried out using industry-standard software such as VGSTUDIO MAX and ZEISS Inspect X-Ray.

A key quality factor is accreditation: Q-Tech Roding is one of the few measurement and testing laboratories in Germany accredited by the German Accreditation Body (DAkkS) to DIN EN ISO/IEC 17025 for CMM and CT metrology. The accredited scope covers the determination of dimensional and form deviations using 3D coordinate metrology as well as defect analyses by computed tomography; the currently valid accreditation scope per the DAkkS certificate is authoritative. For automotive customers, this provides a reliable basis when measurement results need to be documented in a traceable and verifiable way – for example in the context of quality requirements such as IATF 16949.

When Does a CT Scan Make Sense for Automotive Components?

A CT scan is particularly worthwhile when at least one of these questions applies:

• Are there internal defects, voids, porosities or inclusions?
• Do internal contours, channels or wall thicknesses match the design?
• Does the real component deviate from the CAD model?
• Does a prototype need to be inspected without destroying it?
• Should a tool be corrected based on real component data?
• Does an assembly condition within an assembly need to be checked?
• Is data needed for reverse engineering or component digitization?
• Is a traceable inspection report required for customers, suppliers or internal QA?

Not every task needs to be solved with CT. Tactile measurements, optical 3D scans or combined strategies are often more economical or precise for individual features. The strength of an experienced metrology partner therefore also lies in choosing the right method.

Conclusion: Reliable Transparency Inside the Component

Industrial computed tomography is a powerful method for the automotive industry when complex components need to be analyzed completely, non-destructively and verifiably. It makes internal structures visible, supports the evaluation of dimensional and form deviations, and provides a sound data basis for development, quality assurance, tool correction and series processes.

The greatest benefit arises when CT data is not viewed in isolation, but feeds into concrete technical decisions: Is the component functional? Where is the deviation? What is the likely cause? What correction makes sense? What evidence is required? Q-Tech Roding combines CT technology with metrological experience, accredited inspection processes and practical evaluation – so companies receive not just CT data, but a reliable basis for decisions.

FAQ: CT Scanning in the Automotive Industry

What is a CT scan in the automotive industry?

A non-destructive inspection method in which a component is captured three-dimensionally using X-ray technology. Many individual images combine to create a volume model that makes external and internal structures visible. CT is used, among other things, for defect analyses, dimensional inspections, nominal-actual comparisons, porosity analyses and installation control.

Which components can be inspected with industrial CT?

Typical examples are die-cast and injection-molded parts, plastic components, housings, connectors, assemblies, e-mobility components, prototypes and components with internal structures. Suitability depends on size, material, density, wall thickness and resolution.

What advantages does CT offer over tactile or optical measurement technology?

Tactile and optical methods are highly effective for many tasks. CT complements them when internal structures, hidden geometries or assembly conditions need to be inspected – the component is captured non-destructively as a complete 3D volume.

Can a CT scan be used for series inspection?

Yes, including in near-series or automated inspection processes. Whether this is economically and technically sensible depends on the inspection features, cycle time, component size, resolution and evaluation logic. CT is often used on a sample basis, during series ramp-up, or for process assurance.

How accurate is an industrial CT scan?

The achievable accuracy depends on the CT system, component size, material, resolution, measurement strategy and evaluation, and should not be stated as a blanket figure. What matters is suitable inspection planning, qualified evaluation and traceable documentation in accordance with VDI/VDE 2630.

When does a DAkkS test report make sense?

When measurement results need to be documented in a particularly reliable, traceable and internationally verifiable way – for example for customer approvals, complaints, safety-relevant components or demanding quality evidence.

How long does a CT scan take?

This depends on component size, material, resolution, number of projections, scope of evaluation and report creation. A simple digitization has different requirements than an accredited measurement or a detailed defect analysis. A reliable estimate is only possible after reviewing the specific component.

Have Your Inspection Task Evaluated Now

Would you like to inspect an automotive component non-destructively, have CT data evaluated, or get an assessment of a specific measurement task? Send us your component or your requirement – Q-Tech Roding will support you with method selection, CT digitization, evaluation and traceable documentation.

Get a free assessment of inspectability  |  Phone: +49 9461 914 93-0  |  Email: info@q-tech-roding.de