Development of ultra deep penetration welding with 10 kW fiber laser

2008 ◽  
Author(s):  
Xudong Zhang ◽  
Eiji Ashida ◽  
Seiji Katayama ◽  
Masami Mizutani
Keyword(s):  
Fiber Laser ◽  
Deep Penetration ◽  
Deep Penetration Welding

scholarly journals Deep Penetration Welding of Thick Section Steels with 10 kW Fiber Laser

2009 ◽  
Vol 27 (2) ◽  
pp. 64s-68s ◽  
Author(s):  
Xudong Zhang ◽  
Eiji Ashida ◽  
Seiji Katayama ◽  
Masami Mizutani
Keyword(s):  
Fiber Laser ◽  
Deep Penetration ◽  
Thick Section ◽  
Deep Penetration Welding

Detection of Seam Offset Based on Molten Pool Characteristics during High-Power Fiber Laser Welding

2012 ◽  
Vol 549 ◽  
pp. 1064-1068
Author(s):  
Jian Bin Liang ◽  
Xiang Dong Gao ◽  
De Yong You ◽  
Zhen Shi Li ◽  
Wei Ping Ruan
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Molten Pool ◽  
High Energy ◽  
High Energy Density ◽  
Deep Penetration ◽  
Characteristic Parameters ◽  
Fiber Laser Welding ◽  
Deep Penetration Welding

Laser welding includes the heat conduction welding and the deep penetration welding. Deep penetration welding can not only penetrate the material completely, but also can vaporize the material. An important phenomenon during deep penetration welding is that molten pool in the weldment will appear a keyhole. The formation of the keyhole leads to a deep penetration weld with a high aspect ratio and this is the most advantageous feature of welding by high-energy-density beams. Small focus wandering off weld seam may result in lack of penetration or unacceptable welds, and largely reduce heating efficiency. In a fiber laser butt-joint welding of Type 304 austenitic stainless steel plate with a high power 6kW continuous wave fiber laser, an infrared sensitive high-speed video camera was used to capture the dynamic images of the molten pools. The configurations of molten pools were analyzed through image processing techniques such as median filtering, partial Otsu threshold segmentation and Canny edge to obtain the edge of keyholes and molten pools. The circular degree and the area of keyholes and the width and average gray of molten pools were defined as characteristic parameters to reflect the seam offset between the laser beam and the weld center. By analyzing the change of characteristic parameters during welding process, it was found that these parameters were related to the seam offset. Welding experimental results and analysis of characteristic parameters confirmed that the seam offset could be monitored and distinguished by molten pools configuration during high-power fiber laser welding.

Research on Formation Process of Keyhole During Fiber Laser Deep Penetration Welding

2020 ◽  
Vol 57 (7) ◽  
pp. 071402
Author(s):  
赵乐 Zhao Le ◽  
韩雪 Han Xue ◽  
邹江林 Zou Jianglin ◽  
郑凯 Zheng Kai ◽  
肖荣诗 Xiao Rongshi ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Formation Process ◽  
Deep Penetration ◽  
Laser Deep Penetration Welding ◽  
Deep Penetration Welding

Microstructures and Properties of Fiber Laser Welded ACM522 Magnesium Alloy Joint

2009 ◽  
Vol 610-613 ◽  
pp. 911-914 ◽  
Author(s):  
Jun Liu ◽  
Jun Hui Dong ◽  
K. Shinozaki
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Fiber Laser ◽  
Laser Power ◽  
Weld Bead ◽  
Deep Penetration ◽  
Fiber Laser Welding ◽  
Bead Width ◽  
Welding Joints ◽  
Deep Penetration Welding

The microstructure, mechanical properties, hardness, rules and mechanism of various parameters on formation of weld bead of Mg alloy ACM522 using a fiber laser welding were investigated. The results showed that sound welds without major defects could be produced and the mechanical properties of welding joints were good. With the increase of laser power, the penetration depth and bead width of the weld bead all increased. The mechanism of welding transformed from the conduction welding mode to the deep penetration welding mode and the weld beads aspect ratio became higher with the increase of heat input. The microstructure of weld metal was significantly finer and the hardness of weld metal was higher than that of the base metal.

OCT-Einschweißtiefenüberwachung bei Unterdruck/OCT-based weld penetration monitoring at reduced ambient pressure – Influence of reduced ambient pressure on the OCT signal quality in laser deep penetration welding

2021 ◽  
Vol 111 (11-12) ◽  
pp. 863-868
Author(s):  
Thorsten Mattulat ◽  
Ronald Pordzik ◽  
Peer Woizeschke
Keyword(s):  
Penetration Depth ◽  
Ambient Pressure ◽  
Laser Beam Welding ◽  
In Situ Monitoring ◽  
Deep Penetration ◽  
Weld Penetration ◽  
Laser Deep Penetration Welding ◽  
Deep Penetration Welding ◽  
Non Destructive

Die optische Kohärenztomographie (OCT) erlaubt die zerstörungsfreie In-situ-Überwachung der Einschweißtiefe beim Laserstrahlschweißen. Für dieses Verfahren wird hier der Einfluss von verringerten Umgebungsdrücken auf die Messqualität untersucht. Es wird gezeigt, dass sich bei niedrigerem Umgebungsdruck deutlich größere Signalanteile aus dem Bereich des Bodens der Dampfkapillare zurückerhalten lassen. Auf diese Weise steigen die effektive Messfrequenz und die Erkennbarkeit von Änderungen der Einschweißtiefe.   Optical coherence tomography (OCT) enables non-destructive in-situ monitoring of the weld penetration depth during laser beam welding. For this technology, the influence of reduced ambient pressures on the measurement quality is investigated. It is shown that significantly larger signal components are obtained from the bottom of the vapor capillary at lower ambient pressure increasing the applicable measurement frequency and the detectability of changes in the weld penetration depth.

Simulation of Three-Dimensional Transient Behavior of Molten Pool in Laser Deep Penetration Welding

2016 ◽  
Vol 43 (11) ◽  
pp. 1102004
Author(s):  
夏胜全 Xia Shengquan ◽  
何建军 He Jianjun ◽  
王 巍 Wang Wei ◽  
吕学超 Lü Xuechao ◽  
张彤燕 Zhang Tongyan
Keyword(s):  
Molten Pool ◽  
Three Dimensional ◽  
Transient Behavior ◽  
Deep Penetration ◽  
Laser Deep Penetration Welding ◽  
Deep Penetration Welding
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