PT Test Presentaion for awareness of DPT

DPT inspection

1. LIQUID DYE PENETRANT
TESTING

2. INTRODUCTION
PRINCIPLE
•CAPILLLARY ACTION

3. SURFACE PREPRATATION
Detergent Cleaning
Vapor Degreasing
Steam Cleaning
Solvent Cleaning
Ultrasonic Cleaning
Rust and Surface Scale Removal
Paint Removal
Etching

4. DPT PROCESS

5. SURFACE PREPARATION

6. APPLY PENETRANT
BRUSHING
SPRAYING
SOAKING
POURING

9. THE TIME GIVEN TO THE PENETRANT TO
PENETRATE IN TO THE DISCONTINUITIES. IT
DEPENDS UP ON THE MATERIAL COMPOSITION
AND SURFACE CONDITION. 5 TO 30 MIN.
DWELL TIME

10. 1.WATER WASHABLE PENETRANT
(a). VISIBLE
(b). FLUORESCENT PENETRANT
2. SOLVENT REMOVAL PENETRANT
(a) VISIBLE
(b). FLUORESCENT PENETRANT
3.POST EMULSIFIER PENETRANT
(a)VISIBLE
(b)FLUORESCENT PENETRANT
EXCESS PENETRANT REMOVAL

11. DEVELOPER
1.Dry Developer
2. Non-aqueous Wet Developer
3. Water–Based Wet Developer
(a) Water soluble
(b) Water Suspend

12. APPLY DEVELOPER
1. SPRAYING
2. DIPPING
3. POURING

13. Interpretation is carried out
(a) Normal Lamp
(b) Black Lamp or Ultraviolet Lamp
Indication
RELEVANT INDICATION
(a) Rounded indication
(b) Linear Indication
NON REVELANT INDICATION
FALSE INDICATION
INTERPRETATION

14. TRUE OR RELEVANT INDICATION
Continuous Line
Intermittent Line
Round
Small Dots

19. POST CLEANING
POST CLEANING IS THE PROCESS OF
REMOVAL OF DEVELOPER AND THE
PENETRANT FROM THE TEST SPECIMEN
INORDER TO PREVENT FROM FURTHER
CHEMICAL REACTION WHICH MIGHT
REDUSE THE LIVE OF THE PRODUCT. IT IS
CARRIED OUT AFTER THE
INTERPRETATION.

21. ADVANTAGES
SIMPLE
NO ELECTRONIC SYSTEMS
CHEAPER
LESS SKILL REQUIRED
APPLICABLE TO BOTH FINISHED & UNFINISHED
PRODUCTS
♦PORTABLE

22. DISADVANTAGES
SURFACE DEFECTS CAN ONLY BE DETECTED
POROUS MATERIALS PRODUCE FALSE
INDICATIONS