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Motion Sensor:keyhole motion sensing light,Sensitive motion detective sensor, opening door in dark is so easy, Using Advanced PIR sensing technology, Naito, Y.; Katayama, S.; Matsunawa, A. Keyhole behavior and liquid flow in molten pool during laser arc hybrid welding. Proc. SPIE. 2003, 3888, 34–45. [ Google Scholar] [ CrossRef]

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There are many applications for the dissimilar copper/stainless steel welding like the chemical industries, power generation, electric, electronic, and cryogenics. It is very useful in the case of resulting hybrid products which merge the excellent electric and thermal conductivity of copper with essential weight and cost saving [ 4]. These calculations indicate that the surface tension pressure for copper ( P s.c) is less than that for steel ( P s.s), which may be the direct reason for the elongation of the rear keyhole surface towards the copper more than the steel as this force is responsible for the keyhole curvature closing. 5.2. Effect of Welding Speed

Zhou, K.; Cai, L.L. Online Nugget Diameter Control System for Resistance Spot Welding. Int. J. Adv. Manuf. Technol. 2013, 68, 2571–2588. [ Google Scholar] [ CrossRef] Cho, J.H.; Na, S.J. Implementation of real-time multiple reflection and Fresnel absorption of laser beam in keyhole. J. Phys. D Appl. Phys. 2006, 39, 5372–5378. [ Google Scholar] [ CrossRef] If you are a person who avoids complex installations, then you can consider a device that has a long cell life.In this paper, a deep learning based on processing the monitoring system by a high-speed camera and MATLAB image processing was proposed for laser welding [ 22].

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