scholarly journals Elucidation of laser welding phenomena and factors affecting weld penetration and welding defects

2010 ◽  
Vol 5 ◽  
pp. 9-17 ◽  
Author(s):  
Seiji Katayama ◽  
Yousuke Kawahito ◽  
Masami Mizutani
Keyword(s):  
Laser Welding ◽  
Weld Penetration ◽  
Factors Affecting ◽  
Welding Defects

Characterization of Fusion Lines Obtained with Laser Welding on Ductile Iron Plates

2016 ◽  
Vol 254 ◽  
pp. 33-42
Author(s):  
Ioan Catalin Mon ◽  
Mircea Horia Tierean ◽  
Eugen Cicala ◽  
Michel Pilloz ◽  
Iryna Tomashchuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Welding Speed ◽  
Ductile Iron ◽  
Continuous Laser ◽  
Welding Defects ◽  
Criteria For Selection ◽  
Selection Of ◽  
Melted Metal

This paper studies the ductile iron (DI) weldability using laser welding. For performing an Yb:YAG continuous laser was used, with a maximum power of 6 kW. The parametrical window power (P) - welding speed (S) was explored by carrying out the fusion lines on ductile iron plates without preheating, to determinate areas of weldability (complete penetration, correct geometry) to allow further characterization. The criteria for selection of focus areas were the geometry of the fusion lines and the absence of the welding defects. The unsatisfactory domains were characterized by: collapse of the melted metal, incomplete penetration, low fusion lines quality (geometry, compactness). In present study, several values of power and welding speed have been tested to identify their influence on geometry, compactness of the joints and mechanical properties. As result, the power-welding speed diagram for feasible domains of laser welding was generated.

Noise Reduction During Acoustic Monitoring of Laser Welding of High-Strength Steels

2009 ◽  
Author(s):  
Wei Huang ◽  
Radovan Kovacevic
Keyword(s):  
Laser Welding ◽  
Noise Reduction ◽  
Acoustic Signal ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Weld Penetration ◽  
Acoustic Signatures ◽  
Reduction Methods ◽  
Laser Welding Process

During the laser welding process of high-strength steels, different defects, such as a partial weld penetration, spatters, and blow-through holes could be present. In order to detect the presence of defects and achieve a quality control, acoustic monitoring based on microphones is applied to the welding process. As an effective sensor to monitor the laser welding process, however, the microphone is greatly limited by intensive noise existing in the complex industrial environment. In this paper, in order to acquire a clean acoustic signal from the laser welding process, two noise reduction methods are proposed: one is the spectral subtraction method based on one microphone and the other one is the beamforming based on a microphone array. By applying these two noise reduction methods, the quality of the acoustic signal is enhanced, and the acoustic signatures are extracted both in the time domain and frequency domain. The analysis results show that the extracted acoustic signatures can well indicate the different weld penetration states and they can also be used to study the internal mechanisms of the laser-material interaction.

Laser welding defects detection in automotive industry based on radiation and spectroscopical measurements

2009 ◽  
Vol 49 (1-4) ◽  
pp. 133-145 ◽  
Author(s):  
Sergio Saludes Rodil ◽  
Roberto Arnanz Gómez ◽  
José M. Bernárdez ◽  
Fernando Rodríguez ◽  
Luis J. Miguel ◽  
...  
Keyword(s):  
Laser Welding ◽  
Automotive Industry ◽  
Welding Defects

Welding defects detection based on deep learning with multiple optical sensors during disk laser welding of thick plates

2019 ◽  
Vol 51 ◽  
pp. 87-94 ◽  
Author(s):  
Yanxi Zhang ◽  
Deyong You ◽  
Xiangdong Gao ◽  
Nanfeng Zhang ◽  
Perry P. Gao
Keyword(s):  
Deep Learning ◽  
Laser Welding ◽  
Optical Sensors ◽  
Thick Plates ◽  
Disk Laser ◽  
Welding Defects

Effect of plume on weld penetration during high-power fiber laser welding

2016 ◽  
Vol 28 (2) ◽  
pp. 022003 ◽  
Author(s):  
Jianglin Zou ◽  
Wuxiong Yang ◽  
Shikai Wu ◽  
Yue He ◽  
Rongshi Xiao
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Weld Penetration ◽  
Fiber Laser Welding
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