Hi Friends!
Magnetic particle testing is a method to detect surface and sub surface defects on ferrous materials or its weldment by magnetizing the spot by suitable means.
Generally we can able to find the defects embedded from 2 to 3 mm depth .
The images of fluorescent magnetic particle testing image with defect as below,
Hi Friends!
Ultrasonic testing is a non destructive testing method to identify surface and subsurface defects in metals by introducing high frequency sound waves emitted by ultrasonic sensors .
Steel plate lamination, Weld defects can be identified by using this method.
We can able to identify the material homogeneous by using this method.
The basic schematic diagram is as below,
DYE PENETRATION TEST
I.PURPOSE
It is a non destructive testing method for detecting discontinuities such as cracks, seams, laps, cold shuts and lamination that are open to surface. They may be effectively used in the inspection of both ferrous ,non-ferrous ,non-porous, non-metallic materials, such as steels, ceramics, plastics , glass etc.,
II. WORKING PRINCIPLE
The working principle of "Dye penetration examination" is capillary action that is how fluids penetrate into cracks (or discontinuities) on the surface of a material.
III.APPARATUS REQUIRED
1.Cleaner is used to clean oil and grease on testing surface.
2.Developer is used for blotting action.
3.Penetrant
is used to penetrate on surface defects
IV.TEST PROCEDURE
1.Hence the testing kits are highly flammable, it is much better to maintain surface temperature in between 15 to 60 deg. C .
2.Clean the surface by cleaner and ensure the surface free from Oil and grease after cleaning.
2.Apply penetrant on testing surface to be inspected.
3.The time after application of penetrant is known as dwelling time should be minimum of ten minutes.
4.After dwelling time the penetrant on the part is removed by cleaner.
5.Developer
should be applied on surface after cleaning .The recommended blotting time is 7
minutes.
V.INTERPRETATION OF RESULTS
1.Crack or similar opening will show a line
2.Gross porosity may produce large indications.
3.Small porosity shows as minor dots.
General recommendations :
Cracks ,
Lack of fusion not accepted .Rounded indications may be acceptable based on
application.
VI.POST CLEANING
Thorough
cleaning is mandatory on tested surface to avoid any corrosive action on
surface due to chemicals.
VII.REPORT OF EXAMINATION
The results of liquid penetrant test should be recorded as shown below,
1.Part name
2.Test spot identification
3.Material specification
4.Acceptance standard
5.Observations
6.Result
of interpretation
VIII.FEW IMAGES OF DYE PENETRATION TEST
Hi Friends! Magnetic particle testing is a method to detect surface and sub surface defects on ferrous materials or its weldment by m...
