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1、 Content Concept of penetration detection 1 Principles of penetration testing 2 Portable penetration detection system 3 Concept of penetration detection Concept of penetration detection Permeation testing is a non-destructive testing method that uses the osmotic action of a permeate agent with a flu
2、orescent dye(fluorescence method)or a red dye(coloring method)to show defect traces.merit Surface opening defects such as cracks,folding,porosity,cold space and looseness can be inspected for non-porous materials.Not limited by the materials microstructure and chemical composition,it can not only ch
3、eck non-ferrous metals,but also non-porous materials such as plastics,ceramics and glass,with high detection sensitivity.Concept of penetration detection It is simple to operate,inexpensive and is not limited by the nature of the material.limitations Only the surface opening defects of the workpiece
4、 can be detected,and the defects that are blocked by contaminants or closed after mechanical treatment cannot be effectively detected.Not suitable for checking workpieces made of porous or loose materials and workpieces with too rough surfaces.Concept of penetration detection Principles of penetrati
5、on testing Wetting phenomenon Principles of penetration testing It is the interaction force between liquids that is greater than the force between liquid molecules and solid molecules,which is called solids that are not wet by liquids,such as mercury shrinking into mercury beads on glass plates.The
6、first phenomenon Wetting phenomenon Principles of penetration testing The interaction force between the individual molecules of the liquid is less than the interaction force between the liquid molecules and the solid molecules,which is called the solid being wet by the liquid,just like the water dro
7、plets on a clean glass plate,the water droplets will slowly disperse.The second phenomenon Principles of penetration testing The wetting liquid is concave and rising in the capillary,and the phenomenon of the unwrided liquid is convex and descending in the capillary is called capillary.Capillarity P
8、rinciples of penetration testing principle The osmotic liquid containing a colorant or fluorescent substance and with high permeability,under the action of wetting and capillary,penetrates into the surface opening defect of the workpiece,the osmotic solution is washed,dried and coated with a develop
9、er,and the osmotic fluid in the defect is reabsorbed to the surface of the workpiece under capillary action,thereby forming traces of defects.And through visual or special lamps,observe the defect traces for defect assessment.Principles of penetration testing Portable penetration detection system Po
10、rtable penetration detection system Portable penetration testing equipment Sensitivity test block Portable devices Portable penetration testing equipment Osmotic spray tank Remover spray tank device Wipe a cloth(Tissue)lamp Brush If the fluorescence method is used,ultraviolet lamps should also be in
11、stalled.note Matters The nozzle should be kept at a certain distance from the surface of the workpiece to ensure that the detector is atomized and applied evenly.1 The spray tank should be kept away from the source of the fire to avoid causing a fire.2 Empty tanks can only be scrapped after the seal
12、 has been broken.3 Portable penetration testing equipment Sensitivity test block The purpose of using contrast blocks in permeation testing is to test the performance of permeation testing materials under the same conditions and the ability to show defect traces.01 Aluminum alloy test block 02 Stain
13、less steel chrome crack test block 03 Brass plate nickel plated chrome layer crack test block Sensitivity test block Aluminum alloy test block It is suitable for the sensitivity comparison test of two different permeate agents without affecting each other,and also for the sensitivity comparison test of the same permeate under different process operations.Type of test block Sensitivity test block Stainless steel chrome crack test block It is mainly used to verify the sensitivity of operating methods and process systems.Type of test block Thanks for watching