Magnetic particle inspection is an inspection method used to identify defects on the surface of ferromagnetic materials by running a magnetic current through it. It can also be used to detect defects just beneath the surface of materials.
This presentation was developed to provide students in industrial technology programs, such as welding, an introduction to magnetic particle testing. The material by itself is not intended to train individuals to perform NDT functions but rather to acquaint individuals with the NDT equipment and methods that they are likely to encounter in industry. More information has been included than might necessarily be required for a general introduction to the subject as some instructors have requested at least 60 minutes of material.
Introduction to Nondestructive Testing
Visual Inspection
Penetrant Testing
Radiographic Testing
Ultrasonic Testing
Eddy Current Testing
Welder Certification
Welding is a common joining process used extensively
in automobile industries, aircraft machine frames structural
work ship building and various other fields. The physical
properties of these welds are influenced by several factors. In
order to produce satisfactory weldments which fulfill the
requirement of quality the integrity of quality control is
important. To understand the various defects, their causes and
remedies can help to ensure higher quality and longer lasting
welds. This report contains essential information of surface
irregularities and weld discontinuities. Non destructive testing
(NDT) is a mechanism which helps in finding out of defects of any
item like welds before major harms happen to the item without
affecting its usefulness. This thesis discusses the non destructive
testing of weld structures. There are more than fourteen methods
of NDT in metals, in this thesis the most important ones-Visual,
Ultrasonic, X-ray and penetrant testing are discussed in detail.
The experimental results are discussed and comparisons are
made based on cost, accuracy, safety, time consumption, etc.
Based on these comparisons conclusions and recommendations
are made.
NDT-Nondestructive testing is the process of inspecting, testing, or evaluating materials, components or assemblies for discontinuities, or differences in characteristics without destroying the serviceability of the part or system. In other words, when the inspection or test is completed the part can still be used.
This presentation was developed to provide students in industrial technology programs, such as welding, an introduction to magnetic particle testing. The material by itself is not intended to train individuals to perform NDT functions but rather to acquaint individuals with the NDT equipment and methods that they are likely to encounter in industry. More information has been included than might necessarily be required for a general introduction to the subject as some instructors have requested at least 60 minutes of material.
Introduction to Nondestructive Testing
Visual Inspection
Penetrant Testing
Radiographic Testing
Ultrasonic Testing
Eddy Current Testing
Welder Certification
Welding is a common joining process used extensively
in automobile industries, aircraft machine frames structural
work ship building and various other fields. The physical
properties of these welds are influenced by several factors. In
order to produce satisfactory weldments which fulfill the
requirement of quality the integrity of quality control is
important. To understand the various defects, their causes and
remedies can help to ensure higher quality and longer lasting
welds. This report contains essential information of surface
irregularities and weld discontinuities. Non destructive testing
(NDT) is a mechanism which helps in finding out of defects of any
item like welds before major harms happen to the item without
affecting its usefulness. This thesis discusses the non destructive
testing of weld structures. There are more than fourteen methods
of NDT in metals, in this thesis the most important ones-Visual,
Ultrasonic, X-ray and penetrant testing are discussed in detail.
The experimental results are discussed and comparisons are
made based on cost, accuracy, safety, time consumption, etc.
Based on these comparisons conclusions and recommendations
are made.
NDT-Nondestructive testing is the process of inspecting, testing, or evaluating materials, components or assemblies for discontinuities, or differences in characteristics without destroying the serviceability of the part or system. In other words, when the inspection or test is completed the part can still be used.
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A Brief Presentation On Magnetic Particle Testing
1. A Brief Presentation On
Magnetic Particle Testing
By
Hemanth Kumar J
MTech(Manufacturing Engineering) Student,
School of Mechanical Engineering(SMEC),
Vellore Institute of Technology, Vellore Campus, TN, India-632014
2. A Brief Presentation On Magnetic Particle Testing
Outline of the Presentation
1. What is Magnetic Particle Testing ?
2. Basic Theory of Magnetism
3. How Does Magnetic Particle Testing Work?
4. Magnetic Particle Testing Standards
5. Types of Magnetic Particle Testing
6. Steps Involved In Dry And Wet Particle Testing
7. Magnetization Methods
8. Magnetic Field Indicators
9. Types of Particles Used In Magnetic Particle Testing
10. Applications
11. Advantages & Limitations of Magnetic Particle Testing
3. A Brief Presentation On Magnetic Particle Testing
What is Magnetic Particle Testing?
Magnetic particle inspection is
an inspection method used to
identify defects on the surface
of ferromagnetic materials by
running a magnetic current
through it. It can also be used
to detect defects just beneath
the surface of materials.
5. A Brief Presentation On Magnetic Particle Testing
How Does Magnetic Particle Testing Work?
6. A Brief Presentation On Magnetic Particle Testing
Magnetic Particle Testing Standards
The various magnetic testing standards used globally are as follows:
1. ISO 9934-1:2016 specifies the surface preparation of the part to be tested, magnetization
techniques, requirements and application of the detection media, and the recording and
interpretation of results.
2. ASTM E709-19 is used as a base standard for all magnetic particle testing methods in all
industries.
3. ASTM E1444 is a standard used only for the magnetic particle testing in the aerospace
industries.
4. ASTM E3024 establishes minimum requirements for magnetic particle testing used for the
detection of surface or slightly subsurface discontinuities in ferromagnetic material.
7. A Brief Presentation On Magnetic Particle Testing
Types of Magnetic Particle Testing
Dry Particle Inspection Wet Particle Inspection
8. A Brief Presentation On Magnetic Particle Testing
Steps Involved In Dry
Particle Testing.
1. Prepare the part surface
2. Apply the magnetizing force
3. Dust on the dry magnetic particles
4. Blow off excess magnetic particles
5. Terminate the magnetizing force
6. Inspect for indications
Steps Involved In Wet Particle
Testing
1. Prepare the surface
2. Apply the suspension
3. Apply the magnetizing force
4. Inspect for indications
9. A Brief Presentation On Magnetic Particle Testing
Magnetization Methods
Prod Technique
Longitudinal magnetization
technique
Circular Magnetization
Technique
10. A Brief Presentation On Magnetic Particle Testing
Magnetization Methods
Yoke Technique Multidirectional Magnetization Technique
11. A Brief Presentation On Magnetic Particle Testing
Magnetic Field Indicators
1. Determining whether a magnetic field is of adequate strength and in the proper direction is critical
when performing magnetic particle testing.
2. Knowing the direction of the field is important because the field should be as close to perpendicular to
the defect as possible and no more than 45 degrees from normal.
3. Being able to evaluate the field direction and strength is especially important when inspecting with a
multidirectional machine, because when the fields are not balanced properly, a vector field will be
produced that may not detect some defects.
4. The various indicators are as follows:
a. Ketos Ring
b. Gauss Meter
c. Quantitative Quality Indicator (QQI)
d. Pie Gage
12. A Brief Presentation On Magnetic Particle Testing
Magnetic Field Indicators(Cont)
Ketos Ring
Gauss Meter
13. A Brief Presentation On Magnetic Particle Testing
Magnetic Field Indicators(Cont.)
Quantitative Quality Indicator (QQI)
Pie Gage
14. A Brief Presentation On Magnetic Particle Testing
Types of Particles Used In Magnetic Particle Testing
Dry Particles Wet Particles
15. A Brief Presentation On Magnetic Particle Testing
Applications
Crankshaft Inspection Underwater Weld Inspection
16. A Brief Presentation On Magnetic Particle Testing
Applications(Cont.)
Weldment Inspection Boiler Weld Inspection
17. A Brief Presentation On Magnetic Particle Testing
Advantages & Limitations of Magnetic Particle Testing
Advantages Limitations
Simple to use Surface/ Subsurface detection only
Inexpensive Only suitable for magnetic materials
Rapid results No indication of defect depths
Little surface preparation Detection is needed in two directions
More sensitive than visual inspection
18. A Brief Presentation On Magnetic Particle Testing
References
1. https://www.nde-ed.org/NDETechniques/MagParticle/Equipment/Particles.xhtml
2. https://www.nationalboard.org/index.aspx?pageID=164&ID=377
3. https://www.sisco.kobelco.com/english/service/nondestructiveness/mt.html