Want to know more about NDT methods of testing surfaces? While there are a number of options available, let us focus on the Magnaflux Testing method for this article. We also explore the standard guide for magnetic particle testing, ASTM E709to better understand the role of NDT methods, across industries.
What is the Magnaflux Testing Method?
Magnaflux Machine is an advanced equipment used for testing surfaces for defects. It involves magnetizing a ferromagnetic material and applying magnetic particles to its surface. The principle behind this testing method: Where magnetic fields are dense or leaks from the product surface, the magnetic particles are drawn to it. The collection of magnetic particles in that specific area implies there is discontinuity
Why is Surface Preparation for Magnaflux Machine use
When using magnaflux machines for NDT methods, surface preparation is an important step. The surface must be clean, dry, and free of any impurities like dirt, grease, paint, scale, oil, rust, and other foreign materials. Technicians have to ensure that no materials interfere with the inspection.
A number of methods are used for clean surface preparation, but the most important are: chemically or mechanical methods, grinding or machining.
For example, ultrasonic cleaning methods are effective in keeping surfaces free of moisture, oil, or grease. Other options are available by Magnaflux for NDT cleaning methods. These cleaning systems are for use on a wide range of metal and non-metal surfaces.
Sometimes, surface preparation using grinding or machining becomes necessary as very minute or micro-particles may exist on surfaces and mask indications of unacceptable discontinuities.
Finding Defects with Magnaflux Machine
The most common use of magnaflux equipment is to detect defects. These machines are very effective at finding issues in seams, laminations and shrinks. It helps in finding out cracks, hot tears, laps or flakes as well as welding defects. This NDT method is critical for detecting surface and subsurface flaws in ferromagnetic materials as it determines an item's fitness for use or conformity.
What is ASTM E709?
ASTM E709is a standard guide for magnetic particle testing. It covers techniques for both wet and dry magnetic particle testing. Magnetic particle testing is a non-destructive method for detecting cracks and other discontinuities in ferromagnetic materials.
ASTM defines a guide, as a collection of information or options that doesn't recommend a specific course of action. ASTM E709 provides additional information on the application and interpretation of test results. It is useful for preventive maintenance testing can be applied to raw material, semi finished material, finished material, and welds
Prior to E709, the ASTME1444 was in vogue as the standard ‘practice’ for magnetic particle testing. With the establishment of E709, as the standard ‘guide’ for magnetic testing, users have a proper reference guide to inspection procedures.
ASTM E1444 establishes quality control requirements and guidelines for magnetic particle inspection. ASTM E709 is a supporting document that can be used with ASTM E1444.
ASTM E709 is also used as a baseline standard for procedures by magnetic particle users outside the aerospace industry. ASME, AWS, and API standards all use ASTM E709 as a reference to build their specific requirements
Conclusion
Testing is an important part of every manufacturing unit. For most manufacturers, using NDT methods to find defects in ferromagnetic materials is crucial. They follow ASTM E709 guidelines and implement non-destructive testing methods such as magnetic particle testing. A leading solution to detect surface discontinuity using magnetic particles is the magnaflux machine. Using the appropriate machines and following the best practices such as surface preparation are hallmarks of top-quality manufacturers.
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