Liquid penetrant testing (PT)
Liquid Penetrant Testing (PT) is a surface inspection method used to identify discontinuities that are open to the surface of non-porous materials. It is commonly applied to welded joints and machined components where surface integrity is critical.
The process relies on capillary action, where a liquid penetrant is drawn into surface-breaking defects. After a specified dwell time, excess penetrant is removed and a developer is applied to draw out indications, making defects visible under normal or UV light.
Applications
PT is typically used for:
- Detection of fine surface cracks
- Inspection of weld root and toe areas
- Examination of non-ferrous materials
- Identification of fatigue-related surface defects
- Quality verification of finished welded components
Standards & Control
All PT inspections are performed in accordance with applicable international standards, approved Inspection Test Plans (ITPs), and client-specific requirements, ensuring consistency, reliability, and full traceability of results.
Purpose
The purpose of Liquid Penetrant Testing is to reliably detect surface-breaking discontinuities that may affect the performance, safety, or service life of welded structures and components.
