Fluorescent Liquid Penetrant Inspection
Fluorescent Liquid Penetrant Inspection
Liquid penetrant inspection is a nondestructive testing method used to detect surface flaws such as cracks and fractures in materials. It is applicable to both metallic and nonmetallic materials, provided they are not extremely rough or porous. The process involves applying a penetrant, removing excess, and using a developer to draw out the penetrant from defects, making them visible under inspection.
Types and Methods
Penetrants are categorized into two types: Type 1 (Fluorescent dye) and Type 2 (Visible dye). The methods for applying these penetrants include:
- Method A: Water washable
- Method B: Post emulsifiable, lipophilic
- Method C: Solvent removable
- Method D: Post emulsifiable, hydrophilic
Sensitivity Levels
Sensitivity levels, as per AMS 2644, range from Level ½ (Ultra low sensitivity) to Level 4 (Ultra high sensitivity). The choice of sensitivity level depends on the specifications and the nature of the parts being inspected.
Application Procedures
The document outlines procedures for different methods:
- Method A (Water Washable): Preclean, apply penetrant, dwell, rinse, apply developer, and inspect.
- Method C (Solvent Removable): Preclean, apply penetrant, dwell, remove excess with solvent, apply developer, and inspect.
- Method B/D (Post Emulsifiable): Preclean, apply penetrant, dwell, apply emulsifier, rinse, apply developer, and inspect.
Product Selection
The document provides a detailed list of products for each method, including penetrants, emulsifiers, developers, and cleaners, along with their part numbers and packaging options.
Common Applications
Different industries use specific methods and sensitivity levels based on their requirements:
- Aerospace: Method D Level 4 for critical rotating parts.
- Automotive: Method A Level 1 for non-ferrous components.
- Power Generation: Method A Level 2 for large castings and forgings.
Catalog excerpts
0MA3NAFLJUX Faraday Road, South Dorcan Industrial Estate, Swindon SN3 5HE, UK +44 (0) 1793 524566 [email protected] www.magnaflux.eu
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Fluorescent Liquid Penetrant Inspection Penetrants, Emulsifiers, Developers, & Removers
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Technical Info The Importance of Liquid Penetrant Inspection Liquid penetrant inspection is a nondestructive test method which does not harm the parts being inspected. The testing methods detect cracks, fractures, laps, seams and other flaws that are open to the surface that may have been caused by fatigue, impact, quenching, machining, grinding, forging or overload. The process is used on machined parts, castings, forgings and other items that will be placed into service or already in service requiring maintenance. The process involves applying a penetrant chemical, visible or fluorescent, directly...
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Selecting the Correct Penetrant Method Per AMS 2644 Penetrant Types • Type 1: Fluorescent dye • Type 2: Visible dye Penetrant Methods • Method A: Water washable • Method B: Post emulsifiable, lipophilic • Method C: Solvent removable • Method D: Post emulsifiable, hydrophilic Developer Forms • Form a: Dry powder • Form b: Water soluble • Form c: Water suspendible • Form d: Nonaqueous Type 1 fluorescent • Form e: Nonaqueous Type 2 visible dye Differences Between Sensitivity AMS 2644 Penetrant Sensitivity Levels Sensitivity levels are a classification system for fluorescent liquid penetrants which...
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Technical Info Common Applications Common Terms Background – the surface of the test part against which the indication is viewed. It may be the natural surface of the test part or the developer coating on the surface. Bleedout – the action of an entrapped liquid penetrant in surfacing from discontinuities to form indications. Developer – a material that is applied to Aerospace processes commonly use Method D Level 4 penetrants for safety critical rotating parts including turbine blades. the test surface to accelerate bleedout and to enhance the contrast of indications. Developing Time – the elapsed...
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Fluorescent Liquid Penetrant Testing Method A Water Washable Preclean with Aqueous Cleaner Post Emulsifiable Preclean with Aqueous Cleaner Solvent Removable Preclean Apply Penetrant Dwell for 10−30 min. Apply Penetrant Dwell 10–30 min. Apply Penetrant Method B Apply Emulsifier Apply Emulsifier Remove Excess Penetrant Apply cleaner on cloth and then wipe the part Form a Apply Developer Apply Developer Dwell 10 min. – 4 hr. Apply Developer Apply Developer Dwell 10–60 min. Apply Developer
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Product Selection Select Emulsifier Part Numbers Water Washable *Commonly used product 5 Part Numbers Post Emulsifiable Product Name Part Numbers Removal Type Removal Type Product Name Select Penetrant Select Method Product Name
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Select Developer Select Cleaner/Accessories Product Name Part Numbers Product Name
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- Test stand
- Inspection system
- Automated test bench
- Filtration unit
- Time relay
- VOC-free liquid filtration unit
- Inspection machine
- Analog indicator
- Process panel meter
- Cable grommet
- Manual test station
- Absorption filtration unit
- Refractometer
- Sensor indicator
- Additive
- Visible illumination
- Lux meter
- LED illumination
- Other applications control system