V BC Section V, Article 6, T, Light Meters. No reproduction may be made of this material without written consent of ASME. ASME V Article 6 - PT. ARTICLE 6 SECTION V TABLE T REQUIREMENTS OF A LIQUID PENETRANT. ASNT Sample Test WLD ASME V Article 6 - ARTICLE 6 T T T T T T Code Section, the liquid penetrant method described in this Article shall.
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ASME v Article 6 Liquid Penetrant Examination - Free download as Word Doc . doc), PDF Download as DOC, PDF, TXT or read online from Scribd Code Section, the liquid penetrant method described in this Article shall be used together. ASME V Article 6 - PT - Download as PDF File .pdf), Text File .txt) or read online. Section, the liquid penetrant method described in this Article shall be used. Section, the liquid penetrant method described in this Arti- Provided by IHS under license with ASME .. (b) Article 6 of Section V shall be applied for detail.
Written Procedure Requirements. Miscellaneous Requirements. Control of Contaminants. Surface Preparation. Drying After Preparation. Techniques for Standard Temperatures.
The liquid penetrant examination shall meet the re- quirements of Section V, Article 6.
The weld surfaces shall meet the requirements of QW IX 24 QW Five mockup welds are required to qualify each welder or welding operator. The same rules as that for procedure qualification QW The accep- tance standards of QW The section shall be examined at 10X magnification. Seam welding spec imens sha l l b e p repared as shown in F igure QW The sectioned weldment shall be free of cracks, incomplete penetration, expulsions, and inclu- sions.
Porosity shall not exceed one void in the transverse cross section or three voids in the longitudinal cross sec- tion of a specimen. Material Thickness, in.
Application of Penetrant: The penetrant is then applied to the surface of the item being tested. The penetrant is usually a brilliant coloured mobile fluid with high wetting capability. The dwell time mainly depends upon the penetrant being used, material being tested and the size of flaws sought.
As expected, smaller flaws require a longer penetration time. Due to their incompatible nature one must be careful not to apply solvent-based penetrant to a surface which is to be inspected with a water-washable penetrant.
Excess Penetrant Removal: The excess penetrant is then removed from the surface. The removal method is controlled by the type of penetrant used.
Water-washable, solvent-removable, lipophilic post-emulsifiable, or hydrophilic post-emulsifiable are the common choices.
Emulsifiers represent the highest sensitivity level, and chemically interact with the oily penetrant to make it removable with a water spray. When using solvent remover and lint-free cloth it is important to not spray the solvent on the test surface directly, because this can remove the penetrant from the flaws.
If excess penetrant is not properly removed, once the developer is applied, it may leave a background in the developed area that can mask indications or defects. In addition, this may also produce false indications severely hindering the ability to do a proper inspection.
Also, the removal of excessive penetrant is done towards one direction either vertically or horizontally as the case may be.
Application of Developer: After excess penetrant has been removed, a white developer is applied to the sample. Several developer types are available, including: non-aqueous wet developer , dry powder, water-suspendable, and water-soluble.
Choice of developer is governed by penetrant compatibility one can't use water-soluble or -suspendable developer with water-washable penetrant , and by inspection conditions. When using non-aqueous wet developer NAWD or dry powder, the sample must be dried prior to application, while soluble and suspendable developers are applied with the part still wet from the previous step.
NAWD is commercially available in aerosol spray cans, and may employ acetone , isopropyl alcohol , or a propellant that is a combination of the two. Developer should form a semi-transparent, even coating on the surface. The developer draws penetrant from defects out onto the surface to form a visible indication, commonly known as bleed-out.
Any areas that bleed out can indicate the location, orientation and possible types of defects on the surface.
Inspection: The inspector will use visible light with adequate intensity foot-candles or lux is typical for visible dye penetrant. Ultraviolet UV-A radiation of adequate intensity 1, micro-watts per centimeter squared is common , along with low ambient light levels less than 2 foot-candles for fluorescent penetrant examinations.
Inspection of the test surface should take place after to minute development time, and is dependent on the penetrant and developer used. This time delay allows the blotting action to occur.
The inspector may observe the sample for indication formation when using visible dye.