Laser welding components for electric vehicles with a high-power blue laser system

2020 ◽  
Vol 32 (2) ◽  
pp. 022038 ◽  
Author(s):  
M. S. Zediker ◽  
R. D. Fritz ◽  
M. J. Finuf ◽  
J. M. Pelaprat
Keyword(s):  
Laser Welding ◽  
Electric Vehicles ◽  
High Power ◽  
Laser System ◽  
Blue Laser

Laser absorption in high-power fiber laser welding of stainless steel and aluminum alloy

2008 ◽  
Author(s):  
Naoyuki Matsumoto ◽  
Yousuke Kawahito ◽  
Masami Mizutani ◽  
Seiji Katayama
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Fiber Laser Welding ◽  
Laser Absorption

A Design of IPMSM for High-Power Electric Vehicles with Wide-Field-Weakening Control Region

2021 ◽  
pp. 1-1
Author(s):  
Cheon-Ho Song ◽  
In-Soo Song ◽  
Hui-Seong Shin ◽  
Chung-Hui Lee ◽  
Ki-Chan Kim
Keyword(s):  
Control Region ◽  
Electric Vehicles ◽  
High Power ◽  
Wide Field ◽  
Field Weakening

Compact high power Raman laser system using phase-modulated sidebands amplified by a single tapered amplifier

CPEM 2010 ◽  
2010 ◽  
Author(s):  
K. S. Lee ◽  
S. E. Park ◽  
T. Y. Kwon ◽  
S. B. Lee ◽  
J. Kim
Keyword(s):  
High Power ◽  
Laser System ◽  
Raman Laser

Segmentation of Molten Pool Infrared Images Using Morphology during High Power Disk Laser Welding

2012 ◽  
Vol 201-202 ◽  
pp. 91-94
Author(s):  
Yan Xi Zhang ◽  
Xiang Dong Gao
Keyword(s):  
Laser Welding ◽  
High Power ◽  
Molten Pool ◽  
Welding Process ◽  
Histogram Equalization ◽  
Welding Quality ◽  
Infrared Images ◽  
Traditional Methods ◽  
Disk Laser ◽  
Laser Welding Process

Configuration of a molten pool is related to the laser welding quality. Analyzing the configuration of a molten pool is important to monitor the laser welding process. This paper proposes a method of segmentation of a molten pool and its shadow during high power disk laser welding, consequently provides the groundwork for reconstruction of the molten pool and analysis of welding quality. Subsection linear stretching histogram equalization was applied to enhance the contrast of the original images firstly, and then edge detection was used to highlight the edges. After that we used the morphology filtering method to produce the segmentation mask, and then combined the mask with the original images to get the final segmentation results. Also, the proposed method was compared with other traditional methods. The experimental results showed that our method not only could give better segmentation results and process large quantities images automatically, but also overcame the less-segmentation problems of traditional methods.

Optical thin films for high power LD-pumped Nd: YVO 4 457 nm blue laser

2006 ◽  
Author(s):  
Yikun Bu ◽  
Quan Zheng ◽  
Qinghua Xue ◽  
Longsheng Qian
Keyword(s):  
Thin Films ◽  
High Power ◽  
Blue Laser

Minimization of Heat-Affected Zone Size in Welded Ultra-Fine Grained Steel under Cooling by Liquid Nitrogen during Laser Welding

2007 ◽  
Vol 539-543 ◽  
pp. 4063-4068 ◽  
Author(s):  
Hideki Hamatani ◽  
Yasunobu Miyazaki ◽  
Tadayuki Otani ◽  
Shigeru Ohkita
Keyword(s):  
Laser Welding ◽  
Liquid Nitrogen ◽  
Heat Affected Zone ◽  
Laser System ◽  
Heat Removal ◽  
Plate Temperature ◽  
Fine Grained ◽  
Laser Beam Irradiation ◽  
Average Grain Size ◽  
Plume Temperature

Ultra-fine grained steel (UFGS) with an average grain size of less than 1μm has been developed and is expected to demonstrate superior properties. However, its welded heat-affected zone, HAZ, substantially affecting the strength of a welded joint, will be easily softened after welding. Therefore, minimization of UFGS’s HAZ size during laser welding was carried out using the cooling conductor liquid nitrogen. It was found that a shielding gas with adequate flow rate for the liquid nitrogen depth was used to displace nitrogen on the area of laser beam irradiation to stabilize the weld bead. Also, because YAG laser system was mainly used because it has a lower laser induced plasma or plume temperature, which results in a decreased occurrence of pit and blowhole. HAZ size minimization strongly depends on the initial plate temperature. Reduced initial plate temperature shrinks the specific heated temperature range in which softening occurs. However, due possibly to decreasing thermal conductivity under room temperature, which prevents heat removal, the benefit of reducing the initial plate temperature is limited. The optimal initial temperature to minimize the HAZ size, in the present work, was found to be 123K.

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