Ravi Trinity NDT & Welding Blog - Updates on Workshops, seminar, Tech talks on NDT & Welding

What are Eddy Currents? What is eddy current inspection? Eddy current inspection is one of several NDT methods that use the principal of electromagnetism” as the basis for conducting examinations. Eddy currents are created through a process called electromagnetic induction. When alternating current is applied to the conductor, such as copper wire, a magnetic field develops in and around the conductor. If another electrical conductor is brought into the close proximity to this changing magnetic field, current will be induced in this second conductor.  In brief Eddy currents are induced electrical currents that flow in a circular path.  Where do we used Eddy Currents?  • Crack detection     • Material thickness  measurements    • Coating thickness measurements    • Conductivity measurements What are the advantages of Eddy current testing as NDT method? • Eddy current inspection is an excellent  NDT Method f...

Method Equipment Required Enables Detection of Advantages Limitations Remarks Visual Magnifying glass Weld sizing gauge Pocket rule Straight edge Workmanship standards Surface flaws - cracks, porosity, unfilled craters, slag inclusions Warpage, underwelding, overwelding, poorly formed beads, misalignments, improper fitup Low cost. Can be applied while work is in process, permitting correction of faults. Gives indication of incorrect procedures. Applicable to surface defects only. Provides no permanent record. Should always be the primary method of inspection, no matter what other techniques are required. Is the only "productive" type of inspection. Is the necessary function of everyone who in any way contributes to the making of the weld. Radiographic Commercial X-ray or gamma units made especially for inspecting welds, castings and forgings. Film and proces...

'Trinity NDT' carried out raw material NDT on steel Dia 16mm tubes. The cracks observed on ST52 tube material are reproduced here. Some of them are through thickness cracks. The team segregated the defective materials using magnetic particle testing. Visit: www.trinityndt.com to know more about the NDT inspection services and training and certification courses.

Trinity NDT celebrated 9th Anniversary on 01st December 2010.      Posted on 02nd December 2010 at 05.19P(IST)

Images of discontinuities observed after NDT Inspection        Cracks of length around 10-16mm observed on a bearing component during magnetic particle inspection using Yoke type Fluorescent Wet technique Porosity Areas observed on an aerospace component during Liquid Penetrant testing-DPT/PT using Visible Solvent removable Penetrant Technique

Trinity NDT, India inspected LPG tanks for integrity and to find out service induced discontinuities in India. All the weld joints of LPG tanks are tested by Ultrasonic testing using normal beam and angle beam as well. The weld joints also tested for surface and subsurface flaw detection using magnetic particle testing-MPT. Tanks are throughly cleaned to remove All the weld joints got accepted as no harmful flaws observed.Testing of tanks is done as a routine in service inspection by the client using nondestructive testing-NDT. Trinity NDT inspection team is professional in approach with experts having diversified experience to inspect such critical parts for their integrity. Trinity NDT institute for the first time introducing actual inspection case studies exclusively for the candidates attending Level 1, 2 training & certification programs in NDT and welding inspector courses at the institute's training centers all over India. For additional information about inspectio...

Team 'Trinity NDT' carried out magnetic particle testing (inspection)-MPT for a rotary shaft during in-service inspection as a routine test in Bangalore, India. The part is offered for crack detection by magnetic particle testing. It is observed that the part contains clustered cracks of very high intensity in nature. The same shaft is subjected to Ultrasonic testing (inspection) -UT and revealed severe piping flaws inside. The depth of flaws are estimated by Ultrasonic testing - UT and found to be around 45mm from the surface. Team 'Trinity NDT' personnel performed the above tests within the shortest possible time and helped the process plant to take up the production within minutes after replacing with new shaft. Trinity NDT is an inspection services providing company in India and providing inspection services in Ultrasonic flaw detection, magnetic particle testing, dye penetrant testing, radiographic testing/radiography, thickness gauging, material testing ser...