Non-destructive testing lets you observe the materials or objects without causing any damage to them, and by doing this you are able to still use the parts. This is because this method of testing looks for the differences in features of the materials or objects without destroying the part.
There are many types of NDT which are used for different materials or objects; here is a list of some of the different methods that are used:
· Penetrant Testing
· Magnetic Particle Testing
· Ultrasonic Testing
· Eddy Current Testing
· Radiographic Testing
· Visual inspection
· Leak testing
· Infrared testing
The list above are only a few NDT methods, however they each have their own advantages and disadvantages.
Advantages
Penetrant Testing:
You can test large areas of surfaces or volumes of materials at low cost and very quickly. Also minimum skill is required when you are using this type of testing.
Magnetic Particle Testing:
The equipment costs are very low and you are able to inspect large amounts of complex parts quickly. You get immediate results because this is a fast process
Ultrasonic Testing:
Ultrasonic testing can be used on a wide range of materials, and by using this type of testing you can inspect the thickness of the material. Only one side access is required and minimum part preparation is required.
Eddy Current Testing:
This type of testing is not only used for flaw detection, but it is also used to detect the defects of the surface and near surface. It also produces immediate results.
Radiographic Testing:
By using this technique you can inspect layered objects without disassembling them. This type of testing is also used to inspect nearly all materials.
Disadvantages
Penetrant Testing:
A lot of cleaning is required in this method; this is to remove all chemicals. Therefore chemical handling is one of the main disadvantages of this type of testing. Also this process only works on smooth surfaces; this is not a process to use when you have a rough or porous surface.
Magnetic Particle Testing:
This testing works best with smooth surfaces because rough surfaces interfere with this type of testing. Another disadvantage of magnetic particle testing is that only ferromagnetic materials can be examined.
Ultrasonic Testing:
Skill and training is required when using this type of testing. Similar to the other techniques rough surfaces may interfere with the testing and also with this type of testing, thin parts may be hard to inspect.
Eddy Current Testing:
When you are testing larger materials it an be very time consuming. Unlike the other types of testing skill and training is crucial and is more extensive.
Radiographic Testing:
Radiation can be a hazard for people working with this testing, this is one of the main disadvantages. Therefore as a result of this extensive operator training and skills are required.
These are only a fraction of the advantages and disadvanges of a variety of NDT methods. Each of the NDT methods have their own advantages and disadvantages. Therefore when you are trying to find out the properties of materials or objects such as impact resistance, ductility, yield and ultimate tensile strength, fracture toughness and fatigue strength, you need to make sure that you do research to find out which type of method you believe would be best suited for your testing.
http://www.euroteck.co.uk/
There are many types of NDT which are used for different materials or objects; here is a list of some of the different methods that are used:
· Penetrant Testing
· Magnetic Particle Testing
· Ultrasonic Testing
· Eddy Current Testing
· Radiographic Testing
· Visual inspection
· Leak testing
· Infrared testing
The list above are only a few NDT methods, however they each have their own advantages and disadvantages.
Advantages
Penetrant Testing:
You can test large areas of surfaces or volumes of materials at low cost and very quickly. Also minimum skill is required when you are using this type of testing.
Magnetic Particle Testing:
The equipment costs are very low and you are able to inspect large amounts of complex parts quickly. You get immediate results because this is a fast process
Ultrasonic Testing:
Ultrasonic testing can be used on a wide range of materials, and by using this type of testing you can inspect the thickness of the material. Only one side access is required and minimum part preparation is required.
Eddy Current Testing:
This type of testing is not only used for flaw detection, but it is also used to detect the defects of the surface and near surface. It also produces immediate results.
Radiographic Testing:
By using this technique you can inspect layered objects without disassembling them. This type of testing is also used to inspect nearly all materials.
Disadvantages
Penetrant Testing:
A lot of cleaning is required in this method; this is to remove all chemicals. Therefore chemical handling is one of the main disadvantages of this type of testing. Also this process only works on smooth surfaces; this is not a process to use when you have a rough or porous surface.
Magnetic Particle Testing:
This testing works best with smooth surfaces because rough surfaces interfere with this type of testing. Another disadvantage of magnetic particle testing is that only ferromagnetic materials can be examined.
Ultrasonic Testing:
Skill and training is required when using this type of testing. Similar to the other techniques rough surfaces may interfere with the testing and also with this type of testing, thin parts may be hard to inspect.
Eddy Current Testing:
When you are testing larger materials it an be very time consuming. Unlike the other types of testing skill and training is crucial and is more extensive.
Radiographic Testing:
Radiation can be a hazard for people working with this testing, this is one of the main disadvantages. Therefore as a result of this extensive operator training and skills are required.
These are only a fraction of the advantages and disadvanges of a variety of NDT methods. Each of the NDT methods have their own advantages and disadvantages. Therefore when you are trying to find out the properties of materials or objects such as impact resistance, ductility, yield and ultimate tensile strength, fracture toughness and fatigue strength, you need to make sure that you do research to find out which type of method you believe would be best suited for your testing.
http://www.euroteck.co.uk/