Meaning
High-resolution three-dimensional X-ray imaging evaluates the internal structure of joint zones in battery casings without physically sectioning the sample. Performing micro-ct weld inspection allows quality control engineers to detect microscopic voids, cracks, and metal spatter deep within the weld seam. This technique provides a complete volumetric representation of the weld pool and the surrounding heat-affected zone.
It is particularly valuable for validating laser welding parameters during the development of new cell designs.
Technical Execution
Scanning involves rotating the welded assembly through three hundred and sixty degrees while a micro-focus X-ray source projects two-dimensional images onto a high-speed detector. Specialized reconstruction algorithms process these projections to generate a series of cross-sectional slices. These slices are then compiled into a three-dimensional model that can be sliced along any plane.
This digital model allows engineers to measure the precise depth of weld penetration and the volume of any internal porosity.
Defect Resolution
Microscopic pores as small as a few micrometers can be easily resolved and categorized by their size and shape. This high level of detail is necessary to distinguish between harmless process porosity and critical crack initiation sites. The non-destructive nature of the test means that inspected cells can continue to undergo long-term electrochemical testing.
Operational Limit
Long scan times and intensive data processing limit the use of this method to laboratory environments rather than high-speed production lines.
