The course will encourage group discussions around practical problems and provide field expertise on. How to maintain penetrant testing system performance. Standalone penetrant testing equipment for moderate volume liquid penetrant inspection. The ndt liquid penetrant testing pt testing level ii training course will provide theory lectures and practical training to provide the candidate with a preliminary understanding of liquid penetrant test.
Ndt is one of the finest and accurate quality tool used in reducing the costs of testing. After a preselected time interval dwell time, the excess dye is removed from the surface, and then a developer is applied. Liquid penetrant presentation casting metalworking. Objective liquid penetrant processes are nondestructive testing methods for detecting discontinuities that are open to surface. Liquid penetrant testing level 1 this course has been developed in line with snttc1a to develop individuals as asnt level i to perform and report liquid penetrant testing pt results of metals under supervision of asnt level ii and other engineering materials. They may be effectively used in the inspection of both ferrous and nonferrous metals and on nonporous, nonmetallic materials, such as ceramics, plastics and glass. Liquid penetrant testing method booklet contains suggested questions and answers in the liquid penetrant testing method for use in conjunction with recommended personnel qualification and certification in nondestructive testing.
Liquid penetrant testing 2255 ndt handbook, fourth edition. They are nondestructive test ing methods for detecting discontinuities that are open to the surface such as cracks, seams, laps, cold shuts. Liquid penetrant and magnetic particle testing at level 2. Liquid penetrant processes are nondestructive testing methods for detecting discontinuities that are open to surface. Liquid penetrant testing pt is a nondestructive testing method of revealing surface discontinuities. Other nondestructive methods cover a specific area or location and must then be repeated to cover other areas or locations. Liquid penetrant testing1 free download as powerpoint presentation. Question and answer for liquid penetrant testing method. Penetrant inspection, continuousoperation production lines in which the specimens are cleaned, dipped, washed, dried, etc on a time cycle are common. Volume 1, liquid penetrant testing differs from the third edition in many ways. The forging surface detects are laps and bursts which both can easily be identified by performing a liquid penetrant test.
This test method is also nondestructive ndt and does not damage the tested parts. It is a widely applied and lowcost inspection method used to locate surfacebreaking defects in all nonporous materials metals, plastics, or ceramics. Basic processing steps of a liquid penetrant inspection. Nondestructive testing alfa institute of technology, udupi page 18 fig. Pdf nondestructive testing by liquid penetrant testing and. The advantage that a liquid penetrant inspection offers over an unaided visual inspection is that it makes defects easier to see for the inspector. Fluorescent penetrant fade test this test involves the use of the aluminum test blocks in a sidebyside comparison test. Wb200 is a versatile, general purpose penetrant for use on a variety of materials, including aluminum and magnesium. Compact penetrant testing equipment for low volume liquid penetrant inspection. When performing a liquid penetrant test using solvent removable visible dye penetrant, there are several ways to remove excess penetrant from the surface of the part. The two penetrant types are either fluorescent or color contrast dye penetrant. The test object or material is first cleaned and then coated with a visible or fluorescent dye solution.
Among the various methods of nondestructive testing, liquid penetrant is mainly applicable to metallic materials and detects discontinuities of size greater than. An approximation of the temperature may be made with temperature. Understand basic metallurgy where related to ndt and the material tested. Liquid penetrant testing is one of the oldest and simplest ndt methods. Liquid dye penetrant test inspection free ndt sample. The fluorescent penetrant is placed on both sides of the block and processed normally. Understand the advantages and disadvantages of the test method. Purpose the purpose of this procedure is to explain the method of applying the liquid penetration nondestructive test. The developer acts like a blotter and draws penetrant out of imperfections which open to the surface. They vary by type of penetrant and method of cleaning before applying a developer. Liquid penetrant testing in astm standard and references.
Advantages and capabilities of liquid penetrant inspection. Modular penetrant equipment for largescale and highvolume processes. Question and answer for liquid penetrant testing method levels i, ii, and iii for download. Understand the basic principles of penetrant examination. A nondestructive testing ndt procedure suitable for general. However, liquid penetrant testing can only be used to inspect for flaws that break the surface of the sample such as surface cracks, porosity, laps, seams, lack of. Conduct of examinations at levels 1 and 2 v i e n n a, 2 0 1 0 n ondestructive testing. A new chapter on the fluorescent technique and ultraviolet radiation has been added, sections covering safety, materials, and probability of detection have been significantly updated, as have citations to applicable standards. Liquid penetrant testing is probably the most widely used ndt method. Complies with low sulfur and low halogen requirements.
Basic principles of liquid penetrant inspection laboratory testing. The choice of applica tion is usually a matter of preference, but can be influenced by the size and shape of the test piece, the equipment available for conducting the test or the requirements of the test specifications applicable to the samples. They can then be used with any of the three methods of cleaning water washable, postemulsifying, and solvent removable. Liquid penetrant testing detecting flaws on nonporous surfaces. Study 75 liquid penetrant level ii flashcards from eric w.
Which of the methods listed below is generally regarded as most suitable for giving accurate test results. The excess dye is removed from the surface, and then a developer is applied. Recently, equipment to fully automate the visual inspection stage of the process, by robotic handling of the specimen on a programmed procedure with television camera viewing and pattern. The part is a 12 inch thick aluminum plate with a veeweld. Liquid penetrant inspection is capable of examining all of the exterior surfaces of objects. Standard test method for liquid penetrant examination se165 identical with astm speci. The most popular is dye penetrant that is solvent removable. The liquid penetrant testing lpt technique is usually used for the. Pdf development time in liquid penetration testing for metal butt. Pt is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity.
The test is very effective in detecting porosity, cracks, fractures, laps, seams and other flaws that are open to the surface of the test piece and may be caused by fatigue, impact, quenching, machining, grinding, forging. Liquid penetrant testing pt is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on inservice components. Liquid penetrant inspection is a nondestructive test method which does not harm the samples or parts being inspected. Nondestructive testing ndt is commonly thought of a broad field. Decide on the necessary items and products required to complete the job. In penetrant testing, a liquid with high surface wetting characteristics is applied to the surface of a component under test. Liquid penetrant testing is one of the oldest and simplest ndt methods where its earliest versions using kerosene and oil mixture dates back to the 19 t h century. This method of inspection works on the principle of capillary action.
Liquid penetrant testing involves coating the test object with dye penetrant. Volume 1, liquid penetrant tests 142, 142cd, 142wcd supplement to recommended practice no. The surface must be free of oil, grease, water, or other contaminants that may prevent penetrant from entering flaws. This is a common defect that happens in plate material. After allowing the dye penetrant to dwell for a predetermined time, the excess dye is removed and a developer is applied. The test object or material is coated with a visible or fluorescent dye solution. Liquid penetrant testing is a nondestructive material examination procedure used to check for deficiencies such as cracks by spreading a thin liquid dye onto the materials surface, followed by the application of a developer. Pdf nondestructive testing by liquid penetrant testing. Liquid penetrant testing pt, also known as liquid penetrant inspection lpi or dye penetrant testing, is reliable for detecting surfacebreaking flaws in materials with a nonporous surface such as metals, plastics, glass and ceramics. This method is used to reveal surface discontinuities by bleed out of a colored or fluorescent dye from the flaw. One of the most critical steps of a liquid penetrant inspection is the surface preparation. History of penetrant method l etching the surface of the part was etched or pickled by corrosive liquids. The developer aids in the visibility of the dye penetrant, thus revealing the discontinuity. Wb200 is a level 2, method a waterwashable fluorescent penetrant for inspecting castings, extrusions and similar parts.
Learn how liquid penetrant testing products lose performance over time and what you can do to ensure penetrant test reliability november 7, 2017 by cheri stockhausen, product applications manager peak penetrant testing system performance is highly dependent on the integrity of the penetrant materials. The astm e165 standard assists an asnt level iii liquid penetrant test specialist to prepare and write a test procedure. Dye penetrant inspection dp, also called liquid penetrate inspection lpi or penetrant testing pt, is a widely applied and lowcost inspection method used to check surfacebreaking defects in all nonporous materials metals, plastics, or ceramics. Complex shapes can be immersed or sprayed with penetrant to provide complete surface coverage. The technique is based on the ability of a liquid to be drawn into a clean surface discontinuity by capillary action. Use the different types of penetrant products available to industry. More options have developed in the way liquid a variety of penetrant materials are available and selection is often based on the required sensitivity penetrant. The procedure should be written to be fit with the material considered to be tested, expected defect, cost, and other factors. The penetrant may be applied to all nonferrous materials and ferrous materials, although for ferrous components magneticparticle inspection. Pdf as many researches focused on application of nondestructive testing, very less concerned on the critically to reduce the inspection time.361 506 1359 1164 713 598 816 1275 273 270 1368 301 443 919 1268 949 1035 547 1368 1501 453 644 1518 182 1031 1208 218 197 961 1238 1181 921 1203 164 816