Thermal eddy current testing of metallization quality of printed circuit boards (PCB)

2000 ◽  
Author(s):  
D. G. Savushkin
Keyword(s):  
Eddy Current ◽  
Printed Circuit Boards ◽  
Eddy Current Testing ◽  
Circuit Boards ◽  
Current Testing ◽  
Printed Circuit

scholarly journals Novel eddy current testing sensor for the inspection of printed circuit boards

2001 ◽  
Vol 37 (4) ◽  
pp. 2010-2012 ◽  
Author(s):  
D. Kacprzak ◽  
T. Taniguchi ◽  
K. Nakamura ◽  
S. Yamada ◽  
M. Iwahara
Keyword(s):  
Eddy Current ◽  
Printed Circuit Boards ◽  
Eddy Current Testing ◽  
Circuit Boards ◽  
Current Testing ◽  
Printed Circuit

scholarly journals Introduction of a Base-Model for Eddy Current Testing of Printed Circuit Boards

2008 ◽  
Vol 44 (11) ◽  
pp. 4015-4017 ◽  
Author(s):  
H. Bayani ◽  
M. Nishino ◽  
S. Yamada ◽  
M. Iwahara
Keyword(s):  
Eddy Current ◽  
Printed Circuit Boards ◽  
Eddy Current Testing ◽  
Circuit Boards ◽  
Current Testing ◽  
Printed Circuit

Eddy-current testing of the wear resistance of laser-hardened carburized chromonickel steel and the quality of laser hardening of drill bits

2009 ◽  
Vol 45 (10) ◽  
pp. 698-710 ◽  
Author(s):  
A. V. Makarov ◽  
E. S. Gorkunov ◽  
Yu. M. Kolobylin ◽  
L. Kh. Kogan ◽  
L. G. Korshunov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Laser Hardening ◽  
Current Testing ◽  
Drill Bits

Eddy Current and Metal Magnetic Memory Testing Nondestructive Evaluation for Superficial Defects of Old Cylinder Barrel

2016 ◽  
Vol 850 ◽  
pp. 107-112
Author(s):  
Chang Liang Shi ◽  
Shi Yun Dong ◽  
Wei Xue Tang ◽  
Hao Zhan
Keyword(s):  
Stress Concentration ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Magnetic Memory ◽  
Memory Testing ◽  
Metal Magnetic Memory ◽  
Current Testing ◽  
Cylinder Barrel ◽  
Metal Magnetic Memory Testing

Eddy current testing and metal magnetic memory testing, cooperated with special testing devices, were applied to detect the superficial defects of old cylinder barrel. It was indicated that there were three types of the signals, which were non-defect signals, discontinuous peak signals and continuous peak signals. Non-defect signals indicated that there was no defect in cylinder barrel, and the discontinuous peak signals denoted that there was circumferential cracking, and the continuous peak signals showed that there was longitudinal cracking in the surface of cylinder barrel. The amplitude of eddy current testing signals characterizes the depth of cracking, and the gradient of magnetic signals descript the degree of stress concentration. The method mentioned above detects the cracking and stress concentration in the superficial coat of old cylinder barrel, which effectively guarantee the quality of automobile cylinder.

scholarly journals Development of a Physical Separation Route for the Concentration of Base Metals from Old Wasted Printed Circuit Boards

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1014
Author(s):  
Pedro Jorge Walburga Keglevich de Buzin ◽  
Weslei Monteiro Ambrós ◽  
Irineu Antônio Schadach de Brum ◽  
Rejane Maria Candiota Tubino ◽  
Carlos Hoffmann Sampaio ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Electronic Devices ◽  
Preliminary Evidence ◽  
Composition Analysis ◽  
Base Metals ◽  
Circuit Boards ◽  
Physical Separation ◽  
Printed Circuit ◽  
Processing Circuit

Wastes from old electronic devices represent a significant part of the electronic scrap generated in developing countries, being commonly sold by collectors as low-value material to recycling hubs abroad. Upgrading the quality of this waste type could drive the revenue of recyclers, and thus, boost the recycling market. On this basis, this study investigated the possibility of concentrating metals from old wasted printed circuit boards through a physical separation-based route. Preparation of samples comprised fragmentation, size classification, density, and magnetic separation steps, followed by chemical and macro composition analysis. Cu, Al, Fe, and Sn constituted the major metals encountered in the scraps, including some peak concentrations of Zn, Sb, Pb, Ba, and Mn. Four distinct concentrate products could be obtained after suitable processing: (a) a light fraction composed of plastics and resins; (b) an aluminum concentrate; (c) a magnetic material concentrate, containing mainly iron; (d) a final concentrate containing more than 50% in mass of copper and enriched with nonferrous metals. Preliminary evidence showed that further processes, like the separation of copper wires through drumming, can potentially improve the effectiveness of the proposed processing circuit and should guide future works.

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