Magnetic Testing (MT)

Acuren Magnetic Testing (MT)

Magnetic Testing identifies surface and near surface flaws in ferromagnetic materials.

Acuren provides inspection systems ranging from:

  • Portable DC or AC yokes
  • Heavy duty DC mobile machines
  • Dry powder, color contrast or fluorescent techniques
  • Stationary, in-house bench systems for high volume inspection requirements
PrinciplesA magnetic field is induced in the object. Iron filings are dusted onto the surface to be tested. If a crack or other defect is present, the filings will cluster along the edges of the flaw. Variations include wet suspension and dry particle.
How and where is it used?Used to check for surface and near surface cracks on defects in a wide variety of manufactured materials and components, including castings, forgings and weldments.
Performed with on-site, portable equipment.

Examples of inspected materials include raw materials, safety critical automotive parts, and infrastructure, such as bridges, storage tanks and other safety critical structures. Parts with irregular shapes.
Applicable Codes/StandardsASTM E1444-05
ASTM A 275/A 275M Test Method for Magnetic Particle Examination of Steel Forgings
ASTM A456 Specification for Magnetic Particle Inspection of Large Crankshaft Forgings
ASTM E543 Practice Standard Specification for Evaluating Agencies that Performing Nondestructive Testing
ASTM E 709 Guide for Magnetic Particle Testing Examination
ASTM E 1316 Terminology for Nondestructive Examinations
ASTM E 2297 Standard Guide for Use of UV-A and Visible Light Sources and Meters used in the Liquid Penetrant and Magnetic Particle Methods

ISO 3059, Non-destructive testing - Penetrant testing and magnetic particle testing - Viewing conditions
ISO 9934-1, Non-destructive testing - Magnetic particle testing - Part 1: General principles
ISO 9934-2, Non-destructive testing - Magnetic particle testing - Part 2: Detection media
ISO 9934-3, Non-destructive testing - Magnetic particle testing - Part 3: Equipment
ISO 17638, Non-destructive testing of welds - Magnetic particle testing
ISO 23279, Non-destructive testing of welds - Magnetic particle testing of welds - Acceptance levels
Form of report or deliverable?Written report indicating the results of the test, including the size, location and orientation of any defects observed.
AdvantagesFast, cost effective, easy to interpret, instant results
Training is less stringent than for UT, RT or ET
Positive and reliable method of testing suitable components
Surface preparation not as critical
LimitationsOnly effective in ferromagnetic materials
Discontinuity detection is limited to at or near surface
Parts need to be de-greased and de-magnetized before and after inspection
Magnetic flux must be normal to the plant of the defect to show indications
AlternativesPT, UT, RT, ET
Certifications of technicians performing the work?Level II Magnetic Particle technician requires 32 hours instruction and 530 hours experience in method.
Rope access applicable?Yes