What is Eddy Current Testing?

What is Eddy Current Testing?
What is Eddy Current Testing?

What is Eddy Current Testing?

Based on the principle of electromagnetic induction, the nondestructive testing method is called nondestructive testing, which can nondestructive evaluate some properties of conductive materials and their workpieces by detecting the change of induced eddy current in the tested workpieces, or find defects. In industrial production, eddy current testing is one of the main means to control the quality of various metal materials and a few non-metals (such as graphite, carbon fiber composites, etc.) and their products. Compared with other nondestructive testing methods, eddy current testing is easier to realize automation, especially for profiles such as tubes, rods and wires.

Eddy current test (ET) is that when the conductor is put into the changing magnetic field, due to the induced electric field of the vortex around the changing magnetic field, the induced electric field acts on the free charge in the conductor, causing the charge to move and form eddy current. If the metal workpiece has defects, it will change the intensity and distribution of eddy current field and change the coil impedance. Detecting the change can judge whether there are defects.

What is Eddy Current Testing?

Characteristics of eddy current testing

  1. During detection, the coil does not need to contact the workpiece or coupling medium, so the detection speed is fast.
  2. It has high detection sensitivity for defects on or near the surface of the workpiece, and has good linear indication within a certain range, which can be used for quality management and control.
  3. It can be tested at high temperature, narrow area of workpiece and deep hole wall (including pipe wall).
  4. It can measure the thickness of metal coating or non-metallic coating.
  5. It can test non-metallic materials that can induce eddy current, such as graphite.
  6. The detection signal is an electrical signal, which can be digitized for storage, reproduction, data comparison and processing.
  7. The object must be a conductive material and is only suitable for detecting metal surface defects.
  8. When the through coil is used for ET, the specific position on the circumference of the defect cannot be determined; Rotating probe type et can be positioned, but the detection speed is slow.
What is Eddy Current Testing?

Application of eddy current testing in petrochemical industry
Eddy current testing technology is used for in-service and pre service testing of non-ferrous and ferrous metal pipes (such as copper pipe, titanium pipe, stainless steel pipe, boiler four pipe, etc.) in power plants (thermal power plants, nuclear power plants), petrochemical (oil fields, refineries, chemical plants) and other fields. Intergranular corrosion, wall thickness thinning and outer wall wear of pipes can be reliably detected. All kinds of pipes of Mtsco will also be subject to eddy current nondestructive inspection before delivery to ensure the quality of pipes. The interference signals of support plate and tube plate can be effectively removed in the detection. Acoustic pulse detection technology can be used for rapid detection of various metal or non-metal pipelines; Metal magnetic memory technology is used to diagnose the early damage of ferromagnetic parts of in-service equipment.

What is Eddy Current Testing?
What is Eddy Current Testing?

Nickel Alloy Tube Products:

MTSCO – Austenitic / Duplex steel / Nickel alloy

– To be the most reliable industrial metal service provider in the world

Who MTSCO is?

MTSCO established in 2006, during many years development, nowbecomes a large and professional industrial piping system provider, serving customers from more than 100 countries and regions.

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

What products can we provide?

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy
MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

What materials can we provide?


304/L/H/N, 316/L/H/N/Ti, 321/H, 309/H, 310S, 347/H, 317/L904L

Duplex steel

31803, 32205, 32750, 32760

Nickel alloy

Alloy B/ N10001, Alloy B2/N10665, Alloy B3/N10675, Alloy C4/N06455, Alloy C22/N06022, Alloy C276/N10276, Alloy C2000/N06200, Alloy G35/N06035, Alloy G30/N06030,
Alloy S/N06635, Alloy N/N10003, Alloy X/N06002, Alloy 188/R30188, Alloy 230/N06230,
Alloy 556/R30556, Alloy 600/ N06600, Alloy 601/N06601, Alloy 617/N06617,
Alloy 625/N06625, Alloy 718/N07718, Alloy X750/N07750, Alloy 800/N08800,
Alloy 800H/N08810, Alloy 800HT/N08811, Alloy 825/N08825, Alloy 925/N09925,
Alloy 926/N08926, Alloy 400/ N04400, Alloy K500/N05500
Precipitation-hardening Steels: 254SMO/S31254, 17-4PH, 17-7PH, 15-7PH
Nickel: N4/UNS N02201, N6/UNS N02200

How can MTSCO service customers?

MTSCO’s ISO9001 Quality System is issued by TUV. Our full and professional inspection reports contain two parts, one is self-inspection of the requirements beyond ISO9001, which is 100% inspected by our own QC; another is 100% inspected by professional QC teams.

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

Thank you very much for reading this, I wonder if my presentation will help you with your current problem? Looking forward to hearing from you!


1. Can you provide samples?

Of course, We can provide a few sample tubes for you to inspect and experiment.

2. Can we mark our logo on the product?


3. What is your packing?

Woven bags/Wooden boxes/Wooden reel/Iron reel and other packaging methods.

4. What inspection will you do?

In addition to routine surface and dimensional inspection. We can also do tensile, hardness and chemical composition analysis, and NDT like ultrasonic, eddy current, hydraulic testing.

5. What certificates do you have?


6. What is your minimum order quantity(MOQ)?

According to different types of products, you can consult for details.

7. How long is your delivery time?

Products in stock: Within 5-7 days.

Customized products: 30-90 days, which is determined according to the product category.

8. What is your terms of payment?

T/T, L/C,O/A,D/P……

Feedback about: What is Eddy Current Testing?

Send Inquiry by feedback form learn more about product detail, price, etc. Your email address will not be published. Required fields are marked *

You may also like...