presentation on zyglo penetrant inspection

1. SEMINAR PRESENTATION
ON
ZYGLO FLUORESCENT PENETRANT TEST
SUBMITTED TO:
MR. ANSHU ANAND
(ASST. PROF.)
SUBMITTED BY:
ASHISH KUMAR
1313340033

2. INTRODUCTION
 It is simple,reliable and economical testing method of NDT , that
helps to locate and identify surface defects
 It is used for inspecting defects in materials like Alumininum, Copper,
plastics, stainless steel, titanium or ferrous materials etc.
 Defects which is to be inspected may be seams, forging laps,
porosity, cold shuts, fatigue crack, heat treat cracks etc.
It is a quick and accurate process for locating surface flaws

3. STEPS INVOLVED IN ZYGLO FLUORESCENT
PENETRANT TEST
There are six steps involved in this testing method
1. Part preparation or precleaning
2. Application of penetrant
3. Removal of penetrant
4. Part drying
5. Application of developers
6. inspection

4. 1.PART PREPARATION
Precleaning is done before application of penetrant and used for
effective inspection
It is used to remove rust, greese, oil, wax, paint etc. from the surface
of material
Thin cleaners like caustic and acid are used to remove paints
Aqueous cleaners are used to remove oil
Clean and completely dry part is to be inspected before applying
penetrant

5. 2.Application Of Penetrant
After cleaning of part,zyglo penetrant is applied by spraying,brushing
or immersing
After application a waiting time is required,for the penetrant action
takes place
This waiting time is called as Dwell time
Dwell time is depends on the material being inspected and the type
of defect

6. 3.Removal Of Penetrant
Zyglo testing involves four method for removing penetrants
a) Lipophilic method (Post emulsifier):
• In this method emulsifiers are usually applied on it by dipping it in a tank followed
by draining for 2-4 minutes
• Then it is wasged off with water
b) Hydrophilic method (Post Remover):
• The PR method prevents excessive penetrant removal because it only provides
limited solvent action
• A water spray pre-rinse removes excessive penetrant,when part is immersed in a
tank for 20 sec. to 5 minutes
• After immersion post-rins removes any remaining penetrant by water spraying

8. Removal of penetrant cont……
c) Water washable:
• In this method, spray washing is done with water at temp. of 50-100 F
• Black light is used to determine the removal of penetrants
• Overwashing of penetrant is to be avoided in this method
d) Solvent removal method:
• This method is used when use of water as penetrant remover is
ineffective

9. 4.PART DRYING
It involves the drying of part with hot air dryer at temp.
below 160 F
Overdrying is avoided as overdrying can reduce
effectiveness of inspection

10. 5.Application of developers
Developers draws penetrants out of the cracks making
defects indication much more prominent
Zyglo method involves use of three types of developers:
a) Dry powder developer
b) Aqueous developer
c) Non-Aqueous developer

12. 6.INSPECTION
After the application of developer ,a 10 min. dwell time for
developer is required
Then part placed in a dark area for inspection
For Zyglo fluorescent penetrant test MAGNAFLUX ZB-100F
Black light is used

13. POST CLEANING
 After the inspection is complete, post cleaning is a
good idea
This step usually a water spray, removes most
inspection materials
Brushing is normally required to remove non-
aqueous developers

14. ADVANTAGES
High sensitive to small surface discontinuities
Large areas and large volumes of parts/materialscan
be inspected rapidly and at low cost
Parts with complex geometry shapes are routinely
inspected

15. DISADVANTAGES
Penetrant stains clothes and skin and must be treated with
care
The method is limited to surface defects
Training is required for the inspector
Post cleaning of acceptable parts or materials is required

16. SAFETY PRECAUTION
• Wear protective gloves to avoid skin irritation
• Do not smoke or eat while using NDT materials
• Wash hands thoroughly after using NDT materials
• Avoid clothing contact with NDT materials
• Avoid breathing spray mists, air borne powders and solvent vapors
• Store all NDT materials in closed containers well apart from open
flames or other heat sources