Magnetic Particle Testing or Magnetic particle Inspection as conventionally called as Crack Detection, Magnetic flux testing, MPT or MPI testing is one of the most widely used Nondestructive testing NDT method to find surface and subsurface(beneath the surface) flaws using Magnetic flux leakage principle to inspect Ingots, Castings, forgings, rolled plates, sheets, bars, rods, weld joints, shafts, gears, and other engineering components in cast, forged, machined condition, during manufacturing and in-service inspections. In fact MPI testing is the most widely used testing method in any ferrous, steel manufacturing, processing industry.
Trinity NDT– Magnetic particle inspection Labs are equipped with advanced MPI Equipments for in lab and onsite NDT Inspections by our certified NDT MT Level II professionals. In house ASNT NDT Level III experts will closely monitor every Magnetic particle testing MPT inspection activity to meet customer specifications and compliance to international codes, standards and client MPI procedures.
Bench type Wet Stationery Head shot, Coil shot, Central conductor MPI Equipments are used for testing Aerospace and Automotive components at Trinity NDT Labs. Prod Type, magnetic particle inspection AC/DC Yoke type and Permanent magnet type techniques are suitable for onsite MPT testing of structures, pressure vessels, Boiler components, weld joints and large castings which cannot be moved inside the labs.
Trinity NDT MPI testing equipments are PLC controlled and designed to meet Aerospace NDT requirements as per ASTM E 1444 using AC, HWDC & FWDC currents. Equipment is suitable for testing mass production components with great accuracy and repeatability of test results and can produce more than 6000 Amps of current to inspect large components such as Shafts, Hydraulic pistons and machined components.
Fluorescent and Non-fluorescent and or Dry, Wet type techniques are available that suits to every client requirements. Magnetic particle testing equipment, accessories and reference blocks are perfectly calibrated as per standard operating procedures as per international standards.
Our NDT labs at Peenya Industrial Estate, Bengaluru, India are NABL ISO17025 Accredited for Ultrasonic testing, Magnetic Particle inspection, Penetrant testing, FPI testing, Radiography testing and Eddy Current testing. To know more about our NABL accreditation and scope of testing download NABL accreditation certificate of Trinity NDT at Downloads page of this website.
Trinity NDT labs are specially equipped to carry Magnetic particle inspection of ferromagnetic materials for Aerospace NDT applications. FPI testing , Eddy Current testing, MPI testing, Ultrasonic testing, Radiography X-ray facilities meets aerospace standard requirements.
Magnetic particle inspections are carried out as per approved NDT procedures and specifications such as ASTM E 709 – Standard Guide for Magnetic particle testing and ASTM E 1444 standard practice for Magnetic particle testing used for Aerospace NDT applications. Also other standards pertaining to MPI testing are A275/A275M Practice for Magnetic Particle Examination of Steel Forgings, A456/A456M Specification for Magnetic Particle Examination of Large Crankshaft Forgings and American Welding Society AWS Structural Welding codes Acceptance Criteria for Ultrasonic testing - AWS 1.1, 1.3, National Aerospace Laboratories Specifications NDTS and other national and International Standards.
Magnetic particle testing or inspection (MT or MPI testing) is used for quality control and materials testing in all major industries. This includes Magnetic particle testing of castings, forgings, plates, extruded components, weld joints, electrical and electronic component manufacturing, production of steel, pressure vessels, ships, bridges, motor vehicles, machinery and jet engines. In service MPI testing for preventive maintenance is used for detecting impending failure of rail road rolling stock axles, press columns, earth-moving equipment, mill rolls, mining equipment and other machines and components. The flaws to be detected include cracks, inclusions, pipe, laminations, bursts and flakes. They may be inherent in the raw materials, may result from fabrication and heat treatment, or may occur in service from fatigue, corrosion or other causes. MPI testing effective in detecting fatigue cracks during in-service maintenance inspection of power plants, cement plants, sugar plants, petroleum refinery machinery components and structures
The magnetic particle test method is effective for the detection of surface and slightly subsurface discontinuities in ferromagnetic parts. It can be used as an inspection tool at all stages in the manufacture and end use of a product.
Stages of a product’s Life Cycle: Discontinuities can occur in any of the following stages of the product’s life cycle and it can be classified accordingly.
Inherent :As the metal cools and solidifies to produce the original ingot, numerous discontinuities can be introduced. Inherent discontinuities that can be detected by magnetic particle testing include nonmetallic inclusions (sometimes referred to as stringers”) and seams located at the surface.
Primary Processing: When the original material has become solid, it must be worked and formed to produce a rough shaped product. During these processes, the part is said to be in its “primary processing stage”. Typical primary processes include, forging, casting, rolling (hot and cold), extrusion, and drawing. During these processing operations, discontinuities may be produced or existing discontinuities may be modified. Examples of primary processing discontinuities detectable by magnetic particle testing include: Forging burst, Forging laps, Rolling laps, seams, and stringers, Rolling seams, Laminations (at the edges of plates and sheets), Casting shrinkage (at the surface), Casting inclusions (at the surface), Casting cold shuts (at the surface), Casing hot tears (at the surface)
Secondary Processing: After rough shaping metal in the primary processing stage, it is further refined and shaped to produce finished products. This stage is referred to as “secondary processing” and can include such processes as machining, grinding, plating, and heat treatment. These secondary processes may also produce discontinuities or change the appearance of existing ones. Examples of secondary processing discontinuities detectable by magnetic particle testing include: Quench and heat cracks, Grinding cracks (or checks), Machining tears, Plating cracks.
Welding: When parts are joined together by a welding process, numerous discontinuities may be created. The following is a list of welding related discontinuities that may be detected by magnetic particle testing when at or close to the surface. Cracks (longitudinal, transverse, and crater), Lack of fusion, Incomplete penetration (if accessible), Entrapped slag, Inclusions, Overlap or ‘cold’ lap.
In-Service: When the part is put into service and subjected to stresses and environments that may be detrimental to its structure, service discontinuities may result. Those that are detectable by magnetic particle testing include: Fatigue cracks, Stress corrosion cracks, Static failure cracks (overstresses structures)
Types of Components: Examples of materials, and parts that may be inspected using the magnetic particle test method include: Ingots, Billets, Slabs, Blooms, Bar stock, Sheet, Rod, Wire, Castings, Shafts (plain, threaded, or splined), Welds, Bearings and bearing races, Nuts and bolts, Gears, Cylinders, Discs, Forgings, Tubular products and Plates
Industrial Sectors: Magnetic particle testing has many applications throughout industry including but not limited to the following sectors: Petrochemical, Construction, Aircraft and aerospace, Automotive & Shipping (marine), Defense, Nuclear and Transportation.
We at ‘Trinity NDT’ provide reliable inspection services on MPI testing fine tuned to the client needs. Our core competence includes experienced team of NDT Level II, III certified professionals on MT, state of art equipments & approved testing procedures that meets national and international standards. We can perform inspection both in-house and onsite at your site or works. We are serving Pan India including industrial hubs in Bangalore, Chennai, Mumbai, Kochi, Hyderabad, Visakhapatnam-Vizag, Vijayawada, Ranchi, Gurgaon, Noida, Jaipur, Kolkata, Delhi-NCR, Coimbatore, Pune, Nagpur, Patna, Jamshedpur, Ahmedabad, Mangalore, Bhilai-Raipur, Bhubaneswar-Odisha and Hosur Tamilnadu.
Apart from India participants from following countries have been certified at Trinity NDT in Bangalore India. Australia, Azerbaijan, Russia, US, UK, Norway, Dubai, Thailand, Malaysia, Singapore, Papua New guinea, Sri Lanka, Nigeria, South Africa, Kenya, UAE, Saudi Arabia, Oman, Kuwait, Tanzania, Yemen, Ethiopia, Qatar, Philippines, Maldives, Sudan, Bangladesh, Pakistan, Afghanistan, Bhutan, Nepal, Iran, Iraq, Syria, Libya, Cameroon, Angola, Congo, Portugal, Uganda, Mozambique.
Want to learn more about mt & Nondestructive testing ? We would like to share our experience and expertise through NDT & Welding Inspection training certification courses. Join us at our NDT certification course offered by Trinity Institute of NDT Technology, Bangalore, India as per ASNT SNT TC 1A for your Level I & II certification on Ultrasonic testing UT Level I/II. Trinity NDT can also train and certify QA/QC personnel on Eddy Current inspection, Magnetic particle testing, Liquid penetrant testing, Radiography testing, Radiography film interpretation, Visual testing and Ultrasonic thickness gauging. Contact us for more information on courses eligibility, fee structure and training schedules Contact us.
