Keyhole Light Lamp, PIR Infrared IR Wireless Auto Sensor Motion Detector Door Keyhole 4 LED Light Lamp, Night Work Day Standby, Easy to Apply, Tap Lights-Battery Operated (Gold)

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Cui, L.; Chen, B.X.; Qian, W. Microstructures and mechanical properties of dissimilar Al/Steel butt joints produced by autogenous laser keyhole welding. Metals 2017, 7, 492. [ Google Scholar] [ CrossRef] Rai, R.; Elmer, J.W.; Palmer, T.A.; DebRoy, T. Heat transfer and fluid flow during keyhole mode laser welding of tantalum, Ti-6AI-4V, 304L stainless and vanadium. J. Phys. D Appl. Phys. 2007, 40, 5753–5766. [ Google Scholar] [ CrossRef] Battery Powered:Lights need the power to work properly. The source of power can be the electricity of your home from wires or built-in batteries. If you are easy to install the wires with the lamp, then you can consider any device that gets power directly from home electric wires this will assist you to rid of charging the lamp again and again. 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 A simplified sketch of the keyhole geometry of steel/copper welding for different laser welding speeds.

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Wu, D.Y.; Hua, X.M.; Fang, L. Understanding of spatter formation in fiber laser welding of 5083 aluminum alloy. Int. J. Heat Mass Transfer. 2017, 113, 730–740. [ Google Scholar] [ CrossRef] This Small Mini Led Sensor Light offers ideal gentle light for the bedroom, baby room, closet, closets, cabinet, corridor, workshop, basement, garage, stairwell, oil depots, roof, door, drawer, trunk, garage entrances and other places. Energy Saving Mini and elegant appearance; Environment protective material, flexibility and bright.Energy saving and long service life.LED light source is completely green, no pollution. Low-Carbon,Saving energy.

Pang, S.Y.; Chen, L.L.; Zhou, J.X. A three dimensional sharp interface model for self consistent keyhole and weld pool dynamics in deep penetration laser welding. J. Phys. D Appl. Phys. 2011, 44, 025301. [ Google Scholar] [ CrossRef] 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]. Experiments on high laser power continuous welding on copper/stainless steel plates were conducted in previous work [ 23]. Owing to the high heat, the keyhole phenomenon occurred in the melt pool. The keyhole and melt pool images were captured by a high-speed camera. In the present paper, these images are treated by MATLAB software to observe the behavior of the keyhole and the melt pool under the effect of changing such welding parameters as the laser power, the laser welding speed, and the laser shift from the centerline. 2. Material and Experimental Procedures

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The data used to support the findings of this study are available from the corresponding author upon request. Conflicts of Interest Durability:This is a point you should consider in every product while shopping. The lamp should be durable for a longer period, so you do have not to replace it again and again. This lamp is easy to mount anywhere; it comes with double-sided tape so you can mount it anywhere. Because of a complete wireless installation, it will not take over 5 minutes to install this lamp. 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] a) Schematic of laser dissimilar metals welding experimental setup. (b) Extracted the original image of the weld pool [ 19].

Yang, J.; Li, Y.L.; Zhang, H. Microstructure and mechanical properties of pulsed laser welded Al/steel dissimilar joint. Trans. Nonferr. Met. Soc. China 2016, 26, 994–1002. [ Google Scholar] [ CrossRef] 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] Tan, W.D.; Shin, Y.C. Analysis of multi-phase interaction and its effects on keyhole dynamics with a multi-physics numerical model. J. Phys. D Appl. Phys. 2014, 47, 345501. [ Google Scholar] [ CrossRef][ Green Version]Rai, R.; Burgardt, P.; Milewski, J.O.; DebRoy, T. Heat transfer and fluid flow during electron beam welding of 21Cr-6Ni-9Mn steel and Ti-6AI-4V alloy. J. Phys. D Appl. Phys. 2009, 42, 025503. [ Google Scholar] [ CrossRef] Figure 12 shows that the keyhole area, length, and width match parallel to each other and that all three increase from 1 to 4 kW within laser speed ( V = 2 m/min) which leads to increase of all keyhole dimensions, with increasing laser power to reach a saturated region at 5 kW. This may be because of the increases of keyhole opening (M.A) which leads to more laser radiation loss.

Xue, Z.Q.; Hu, S.S.; Lee, D.K. Molten pool characterization of laser lap welded copper and aluminum. J. Phys. D Appl. Phys. 2013, 46, 495501. [ Google Scholar] [ CrossRef] Siegman, A.E. Defining, measuring, and optimizing laser beam quality. SPIE 1990, 1224, 2–13. [ Google Scholar] Pang, S.Y.; Chen, W.D.; Zhou, J.X. Self consistent modeling of keyhole and weld pool dynamics in tandem dual beam laser welding of aluminum alloy. J. Mater. Process. Technol. 2015, 217, 131–143. [ Google Scholar] [ CrossRef]

It is evident from Figure 16 that as the travel speed increases, the recoil pressure on the copper front wall keyhole surface ( P r.c) becomes higher than the recoil pressure on the steel front wall surface ( P r.s). Because the interaction time between laser and front keyhole surface decreases with increasing laser travel speed, this, therefore, suggests that the recoil pressure has a dynamic magnitude depending on the rate of heat transfer of the metal. This is often expressed in terms of “thermal conductivity.” The thermal conductivity of copper (401 W/m °C) is very high compared with steel 316 L (16.3 W/m °C), and this may explain why the keyhole elongated more in the direction of the copper front wall.