We offer on-site liquid penetrant inspection services. For detecting of surface breaking cracks in non magnetic materials, we use both colour contrast and fluorescent penetrant for highly sensitive inspection.
The test object is coated with a solution that contains a visible or fluorescent dye. Excess solution is then removed from the surface of the object but leaving it in surface breaking defects. A developer is then applied to draw the penetrant out of the defects. With fluorescent dyes, ultraviolet light is used to make the bleed out fluoresce brightly, thus allowing imperfections to be readily seen. With visible dyes, vivid dyes, vivid colour contrasts between the penetrant and developer make "bleed out" easy to see. This method is only applied to detect the defects so called open-to-surface.
The test object is coated with a solution that contains a visible or fluorescent dye. Excess solution is then removed from the surface of the object but leaving it in surface breaking defects. A developer is then applied to draw the penetrant out of the defects. With fluorescent dyes, ultraviolet light is used to make the bleed out fluoresce brightly, thus allowing imperfections to be readily seen. With visible dyes, vivid dyes, vivid colour contrasts between the penetrant and developer make "bleed out" easy to see. This method is only applied to detect the defects so called open-to-surface.
Applications :
Advantages :
Limitations :
- It is used to inspect metals for surface defects
- Weld discontinuities open to surface i.e. cracks, porosity and seams
Advantages :
- It can be used on a wide variety of materials: ferrous and nonferrous metals and alloys, fired ceramics, powdered-metal products, glass, and some types of organic materials
- Portable, relatively inexpensive equipment
- Expedient inspection results
- Results are easily interpreted
- Requires no electrical energy except for light source
- Indications may be further examined visually
- Adapted to volume processing permitted 100 percent surface inspection
Limitations :
- Surface films such as coatings, scale, and smeared metal mask or hide rejectable defects
- Parts should be clean before and after inspection
- Bleed out from porous surfaces can also mask indications
- Remain in contact with body surfaces for extended periods, they may cause skin irritation
- Infrared Thermography
- Remote Visual Inspection
- Thickness Mapping of Boiler Tubes
- Time of Flight Diffraction (TOFD)
- Ultrasonic Phased Array
- Ultrasonic Flaw Detection
- Recordable UT
- Ultrasonic Thickness Gauging
- High Temperature Gauging
- Oxide Scale Measurement
- Magnetic Particle Inspection
- Liquid Penetrant Testing
- Onsite Hardness Testing
- Coating Thickness Measurement
- Material Sorting & Tube Testing
NDTS India (P) Limited
619 & 620, The Great Eastern Galleria
Plot No. 20,Sector 4, Nerul
Navi Mumbai - 400 706.
619 & 620, The Great Eastern Galleria
Plot No. 20,Sector 4, Nerul
Navi Mumbai - 400 706.
Tel. : + 91-22-6138 0600
+ 91-22-2770 3913
+ 91-22-2770 3923
+ 91-22-2772 9077
Fax : + 91-22-2770 3903
Email : info@ndts.co.in
Click here to submit a enquiry form