PAMP: PowerPoint Presentation – 03.2009
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USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
M. Genel, D. Manara, B. Badiello, A. Pozzi, A. Tessier - Laboratory of Assay and Analysis PAMP Presented by M. Genel
PAMP: PowerPoint Presentation – 03.2009
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USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
“What you can see and that can be seen it is only shape and colour, what you can ear and that can be heard it is only name and p and colour, name and sound. But how can mankind believe that shape sound can be enough to understand the object !…”
Chuang Tzu (370 - 318 a C. C.)) Chinese philosopher
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PAMP: PowerPoint Presentation – 03.2009
Introduction - Reference Frame
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
International norm ASTM E1816-07
Standard practice for Ultrasonic Testing Using Electromagnetic Acoustic Transducer
ASTM E797
Practice for measuring thickness by manual ultrasonic pulseecho contact method
UNI EN 14127:2004
Non destructive check- Thickness measurement with ultrasonic probe
PAMP: PowerPoint Presentation – 03.2009
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Introduction – Requirement
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
Objective and formal quality control system of our product
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PAMP: PowerPoint Presentation – 03.2009
Materials and Methods
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
Theory: Ultrasound
APPLICATION
SUBSONIC RANGE
AUDIBLE RANGE
PAMP: PowerPoint Presentation – 03.2009
ULTRASONIC RANGE
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Materials and Methods
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
Transducers
PAMP: PowerPoint Presentation – 03.2009
Materials and Methods
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USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
Instrumentation Krautkramer USM 35X Universal Ultrasonic Flaw Detector
Sound velocity 1,000 to 15,000 m/s, Display delay From -10 to 1,000 mm (340 μs) Probe delay 0 to 200 μs Auto calibration 2 point calibration Pulse intensity 220 pF, 1 nF Damping 50 ohms, 500 ohms Pulse repetition frequency 4 to 1,000 Hz, variable in 10 steps Frequency ranges (-3 dB) 0.2 to 1 MHz 0.5 to 4 MHz 0 8 to 8 MHz 0.8 MH 2 to 20 MHz Gain 0 to 110 Db Fine gain 4 dB, continuously variable in 40 steps Rectification Full-wave, negative and positive half-wave, RF mode Reject Linear, 0 to 80 % screen height Variable in steps of 1 %
PAMP: PowerPoint Presentation – 03.2009
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Results – Layering
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
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PAMP: PowerPoint Presentation – 03.2009
Results
– Gas bubbles
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
DISSIPATION OF SIGNAL
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Results – Inclusions
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
REFLECTION OF SIGNAL
TOOL DROPPED DURING CASTING
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PAMP: PowerPoint Presentation – 03.2009
Results- Counterfeit
Good Standard Bar
PAMP: PowerPoint Presentation – 03.2009
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
“Metal inside Bar”…
Different Metal Bar
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Remarks
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
Control asked from market Continuous quality improvement (ISO 9001) Not equivalent check but support routine check Not definitive check : if bar has not expected ultrasonic profile, but it comply to routine check, it is remelted or/and it is assigned to other use.
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PAMP: PowerPoint Presentation – 03.2009
Conclusion
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
•
Rapid method (we check all bars produced)
•
Non destructive method
•
Quality check of melting and casting
•
Market standard controls fitting
PAMP: PowerPoint Presentation – 03.2009
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Thank you for your attention
For any further questions please contact
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PAMP: PowerPoint Presentation – 03.2009
Bibliography
USE OF ULTRASONIC ANALYSIS FOR THE QUALITY CONTROL OF GOLD STANDARD LARGE BARS
Industrial Applications of Ultrasound -A Review II. Measurements, Tests, and Process Control Using Low-Intensity Ultrasound-L. C. Lynwnworth - IEEE Transactions on sonics and ultrasonics,, VOL. su-22,, N. 2,, March 1975 ASTM E1816-07. Standard practice for Ultrasonic Testing Using Electromagnetic Acoustic Transducer ASTM E797. Practice for measuring thickness by manual ultrasonic pulse-echo contact method UNI EN 14127:2004. Non destructive check- Thickness measurement with ultrasonic probe
PAMP: PowerPoint Presentation – 03.2009
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