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Presented By:- VASUDEVANAND VINAYAK NANCHE V.J.T.I. Mumbai / J.N.V. Sindhudurg Guided By:- Mr. MoKhan L&T Powai
M/S LARSEN & TOUBRO, POWAI - 400072 Electrical & Electronics Business Group (EBG) Dept : Switchgear Quality Control & Reliability (SQR)
Brazing- Brazing is a metal-joining process in which two pieces of metal are joined with a third molten filler metal, which distributed between two close-fitting parts by capillary action. Brazed joints are stronger than the two metals being bonded together.
C-Scan Ultrasonic Non-destructive Testing- Some flaws such as inclusion, incomplete penetration, porosity, etc. may occur during brazing. This setup was originally developed to detect / locate these kinds of flaws. 	C-scan is a two dimensional graphical presentation, in which the discontinuity echoes are displayed in a top view, on the test surface. 	C-scan image of the bonding interface can be obtained, from which the system can auto measure & evaluate bonding rate (in %) of a bonded interface.
C-Scan Ultrasonic Non-destructive Testing- Principles of pulse-echo techniques- When the ultrasonic sound transmitted in an object, echoes will come back from discontinuities, flaws or boundaries in the object, which will be amplified & displayed on a cathode-ray oscilloscope, showing their amplitude & flight time in the form of C-Scan image.
Principles of pulse-echo techniques Cathode-ray oscilloscope water Probe T S B F Component T-transmitted wave S-Surface echo F-Flaw echo B-Bottom echo
Schematic diagram of the equipment in C-scan system
Setup for C-Scan Ultrasonic Non-destructive Testing
Confirmation of the test result: Milling test has been carried out & milled surface has been compared to the C-Scan image obtained before milling of the contact assembly. Additional mechanical testing like shear strength test, torque test & pull test etc. Compare mechanical testing results with previously measured bonding % of brazed joints. Hence we can make our report strong enough to ensure brazing quality.
Project Shearing Fixture for brazed Joints By – Vasudevanand Nanche SQR-QA
Shearing fixture for Brazed joints. Synopsis ,[object Object]
 What is shear?
 Working principle of the Fixture.
 Advantages of the Fixture.,[object Object]
 Development / Audit
 Advantage over Chisel Test
 Bonding V/s Shear strength,[object Object]

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Shearing fixture

  • 1. Presented By:- VASUDEVANAND VINAYAK NANCHE V.J.T.I. Mumbai / J.N.V. Sindhudurg Guided By:- Mr. MoKhan L&T Powai
  • 2. M/S LARSEN & TOUBRO, POWAI - 400072 Electrical & Electronics Business Group (EBG) Dept : Switchgear Quality Control & Reliability (SQR)
  • 3. Brazing- Brazing is a metal-joining process in which two pieces of metal are joined with a third molten filler metal, which distributed between two close-fitting parts by capillary action. Brazed joints are stronger than the two metals being bonded together.
  • 4. C-Scan Ultrasonic Non-destructive Testing- Some flaws such as inclusion, incomplete penetration, porosity, etc. may occur during brazing. This setup was originally developed to detect / locate these kinds of flaws. C-scan is a two dimensional graphical presentation, in which the discontinuity echoes are displayed in a top view, on the test surface. C-scan image of the bonding interface can be obtained, from which the system can auto measure & evaluate bonding rate (in %) of a bonded interface.
  • 5. C-Scan Ultrasonic Non-destructive Testing- Principles of pulse-echo techniques- When the ultrasonic sound transmitted in an object, echoes will come back from discontinuities, flaws or boundaries in the object, which will be amplified & displayed on a cathode-ray oscilloscope, showing their amplitude & flight time in the form of C-Scan image.
  • 6. Principles of pulse-echo techniques Cathode-ray oscilloscope water Probe T S B F Component T-transmitted wave S-Surface echo F-Flaw echo B-Bottom echo
  • 7. Schematic diagram of the equipment in C-scan system
  • 8. Setup for C-Scan Ultrasonic Non-destructive Testing
  • 9. Confirmation of the test result: Milling test has been carried out & milled surface has been compared to the C-Scan image obtained before milling of the contact assembly. Additional mechanical testing like shear strength test, torque test & pull test etc. Compare mechanical testing results with previously measured bonding % of brazed joints. Hence we can make our report strong enough to ensure brazing quality.
  • 10. Project Shearing Fixture for brazed Joints By – Vasudevanand Nanche SQR-QA
  • 11.
  • 12. What is shear?
  • 13. Working principle of the Fixture.
  • 14.
  • 16. Advantage over Chisel Test
  • 17.
  • 18. Shear always occurs between the points in the least resisting region, where forces are applied in opposite direction.
  • 19.
  • 20. Shearing fixture for Brazed joints. Polarity Testing Setup
  • 21.
  • 22. Flexibility / Multi purpose.
  • 23. Safe & easy to use.
  • 24. Design to have long life.
  • 25. Can be used for Trouble shooting analysis.
  • 26.