J
John A. Hopkins
Researcher at University of Tennessee
Publications - 37
Citations - 455
John A. Hopkins is an academic researcher from University of Tennessee. The author has contributed to research in topics: Laser & Laser beam welding. The author has an hindex of 11, co-authored 36 publications receiving 441 citations. Previous affiliations of John A. Hopkins include University of Tennessee Space Institute.
Papers
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Journal ArticleDOI
Melt pool dynamics during laser welding
TL;DR: In this paper, the dynamics of the melt pool and keyhole during CO2 laser welding using high-speed video photography and the laser reflectometer technique were investigated using a low-power argon laser beam, focused on the weld pool, provided illumination to obtain a direct image of weld pool surface.
Patent
Method for marking, tracking, and managing hospital instruments
Mary Helen McCay,T. Dwayne McCay,John A. Hopkins,John Brice Bible,Frederick A. Schwartz,Narendra B. Dahotre,C. Michael Sharp +6 more
TL;DR: In this article, a method for marking, tracking, and managing hospital instruments with information indicative of the manufacturer, part number, and serial number of each instrument is presented. But this method is limited to the use of surgical trays and kits.
Proceedings ArticleDOI
A concept for a hydrodynamic model of keyhole formation and support during laser welding
TL;DR: A concept for keyhole formation during laser welding is proposed in this paper, where the hydrodynamic motion of the melt is taken into account, and growth of the keyhole is attributed to the melt displaced from the laser focus due to vaporization recoil pressure.
Patent
Method for increasing wear resistance in an engine cylinder bore and improved automotive engine
Yucong Wang,Barry J. Brandt,John Brice Bible,Narendra B. Dahotre,John A. Hopkins,Mary Helen McCay,T. D. McCay,Fredrick A. Schwartz +7 more
TL;DR: In this paper, a method for enhancing the wear resistance of an iron engine cylinder bore was proposed, where laser alloying of the cylinder bore with selected precursors was used to enhance the resistance to wear caused by the corrosion caused by automotive ethanol fuel.
A Concept for a Hydrodynamic Model of Keyhole Formation and Support During Laser Welding
TL;DR: In this paper, a concept for keyhole formation during laser welding is proposed, where the hydrodynamic motion of the melt is taken into account, and growth of the keyhole is attributed to the melt displaced from the laser focus due to vaporization recoil pressure.