Saturday, January 5, 2019
Liquid penetrant testing advantages and disadvantages
Advantages and Disadvantages of Penetrant Testing.
Like all nondestructive inspection methods, liquid penetrant inspection has both advantages and disadvantages. In other words Dye penetration inspection has it’s own advantages and disadvantages compared to other non-destructive testing methods.
Like all NDT inspection methods, liquid penetrant testing has both advantages and disadvantages. The method has high sensitivity to small surface discontinuities. Large areas and large volumes of parts/materials can be inspected rapidly and at low cost.
It is generally accepted that liquid penetrant testing has the following advantages: Sensitive to small surface discontinuities. Few material limitations—works on metallic, non-metallic, magnetic, non-magnetic, conductive, and non-conductive materials.
Advantages of the penetrant method of Non-Destructive Examination are: It is a very sensitive method, capable of finding extremely fine flaws. It can be used on magnetic and non-magnetic metals, some plastics and glass. Small objects, with awkward shapes, can be inspected.
Like all nondestructive inspection methods, liquid penetrant inspection has both advantages and disadvantages. In other words Dye penetration inspection has it’s own advantages and disadvantages compared to other non-destructive testing methods.
Like all NDT inspection methods, liquid penetrant testing has both advantages and disadvantages. The method has high sensitivity to small surface discontinuities. Large areas and large volumes of parts/materials can be inspected rapidly and at low cost.
It is generally accepted that liquid penetrant testing has the following advantages: Sensitive to small surface discontinuities. Few material limitations—works on metallic, non-metallic, magnetic, non-magnetic, conductive, and non-conductive materials.
Advantages of the penetrant method of Non-Destructive Examination are: It is a very sensitive method, capable of finding extremely fine flaws. It can be used on magnetic and non-magnetic metals, some plastics and glass. Small objects, with awkward shapes, can be inspected.
Metal crack detection spray
There are some crack detection developer sprays. Those sprays highlights very fine cracks. They are also suitable for pressure testing & leak detection. As an example FLAWFINDER DEVELOPER is an aerosol applied white powder which is designed to draw the penetrant out of a flaw, and enhance the definition, to facilitate detection when used in conjunction with FLAWFINDER crack detection spray.
If you search throughout the internet you can easily find out all of the information about the Magnaflux product: crack detection spray / multi-use Spotcheck® SK series. For more information you can contact a supplier or the parent company.
There is a product called Dye Penetrant Crack Finder Kit. This kit did the job. It was less expensive than other kits probably due to smaller aerosol can. This will be fine with you if you only needed it for one inspection.
You can use this product For Detecting Cracks and Leaks in Metal Surfaces: Dye Penetrant Standard Developer, Non-Aqueous Wet, 12 oz Aerosol Can.
You can use those products to perform a surface crack detection using two of the most common nondestructive testing methods: liquid penetrant testing and magnetic particle testing.
You can use the GOODSON Glow Crack Detection sprays to find surface cracks in cast iron and aluminum under blacklights.
When using or performing dy-mark, dymark, flawcheck, crack detection, flaw finder the first two steps are to spray the test area with the Dy-Mark Flawchek Cleaner and wipe the surface with a cloth.
If you search throughout the internet you can easily find out all of the information about the Magnaflux product: crack detection spray / multi-use Spotcheck® SK series. For more information you can contact a supplier or the parent company.
There is a product called Dye Penetrant Crack Finder Kit. This kit did the job. It was less expensive than other kits probably due to smaller aerosol can. This will be fine with you if you only needed it for one inspection.
You can use this product For Detecting Cracks and Leaks in Metal Surfaces: Dye Penetrant Standard Developer, Non-Aqueous Wet, 12 oz Aerosol Can.
You can use those products to perform a surface crack detection using two of the most common nondestructive testing methods: liquid penetrant testing and magnetic particle testing.
You can use the GOODSON Glow Crack Detection sprays to find surface cracks in cast iron and aluminum under blacklights.
When using or performing dy-mark, dymark, flawcheck, crack detection, flaw finder the first two steps are to spray the test area with the Dy-Mark Flawchek Cleaner and wipe the surface with a cloth.
Tuesday, January 1, 2019
Dye Penetrant Inspection
Nondestructive Testing
Dye Penetrant Inspection
Dye penetrant examination is an important method of
non-destructive testing of materials.
This is the basic principle: often the surface of a
workpiece is covered with rust or paint which masks the material defects as
shown in the sectional view.
Therefore, the first step is always the pre-cleaning of the
test piece surface.
This must be done very thoroughly so that any defects
present here it is a crack are open to the surface.
In the second step that penetrant is applied to the test
piece usually a red colored low viscosity oil.
Due to the penetrance high surface wetting capability it
penetrates into the defects and cracks.
After several minutes of dwell time the third step is to
rinse the path surface cautiously with water.
The water removes the penetrance completely from the surface
but leaves it in the crack.
Now the fourth step after drying the test piece a developer
supplied on to the surface.
The developer is a fine grained white powder suspended in a
liquid it forms an even coating on the surface after drying it draws penetrant
from the crack out onto the surface.
The location of the crack is indicated clearly on the
surface and this is how it is carried out in practice.
We wish to inspect two samples a segment of a worm gear
shaft and a broken bicycle crank arm. Both test pieces have already been
cleaned.
First in line is the worm gear shaft.
The material tester applies the penetrant.
After a dwell time of about 10 minutes she removes the
excess penetrant from the surface by rinsing the test piece gently with water.
She takes care not to rinse for an unnecessary long time.
Because the penetrant is supposed to stay in the defects.
Now she dries the surface of the sample with a cloth to
absorb the excess water.
As the final step she applies the developer and lets it dry.
That's it. Several cracks are indicated on the surface in
deep red color.
Next the broken bicycle crank arm has to undergo the die
penetration test.
Spraying with penetrant, allowing to soak, rinsing, drying
and applying developer.
Clearly additional cracks are indicated on the fragments.
Finally the pros and cons at a glance:
Advantages of this test method are
- almost all materials can be tested and the method is
simple and low-cost for a single inspection.
Disadvantages are:
- only suitable for surface defects
- no information about the depth of flaws can be gained and
rough surfaces are difficult to test.
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