This British Standard is the UK implementation of EN ISO It is identical to ISO It supersedes BS EN which. ISO specifies acceptance levels for indications from surface breaking imperfections in metallic welds detected by penetrant testing. The acceptance. I.S. EN ISO Acceptance levels (ISO ) . downloading this file, parties accept therein the responsibility of not.
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en - Free download as PDF File .pdf), Text File .txt) or read online for BS en ISO Non-Destructive of Welds-Penetrant Testing of Welds v2. This document (EN ISO ) has been prepared by Technical Committee ISO/TC 44 "Welding and allied processes" in collaboration with Technical. Anyone willing to share:)? EN ISO Non-destructive testing of welds - Penetrant testing of welds - Acceptance levels (ISO.
Below are the main steps of Liquid Penetrant Inspection: 1. Pre-cleaning: The test surface is cleaned to remove any dirt, paint, oil, grease or any loose scale that could either keep penetrant out of a defect, or cause irrelevant or false indications.
Cleaning methods may include solvents , alkaline cleaning steps, vapor degreasing , or media blasting. The end goal of this step is a clean surface where any defects present are open to the surface, dry, and free of contamination. Note that if media blasting is used, it may "work over" small discontinuities in the part, and an etching bath is recommended as a post-blasting treatment.
Application of the penetrant to a part in a ventilated test area. 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. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
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Every care has been taken to ensure that the file is suitable for use by ISO member bod parameters were optimized for printing.
Every care has been taken to ensure that the file is suitable for use by ISO member bodthe unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinanyformorbyan Allrightsreserved. Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinanyformorbyanelectronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherISOattheaddressbe electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherISOattheaddressbeISO's member body in the country of the requester.
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