Laser power modulation at the threshold from heat-conduction to deep-penetration welding

2010 ◽  
Author(s):  
Peter Stritt ◽  
Rudolf Weber ◽  
Thomas Graf ◽  
Steffen Müller ◽  
Christian Ebert
Keyword(s):  
Heat Conduction ◽  
Laser Power ◽  
Deep Penetration ◽  
Power Modulation ◽  
Deep Penetration Welding

scholarly journals Utilizing Laser Power Modulation to Investigate the Transition from Heat-Conduction to Deep-Penetration Welding

2011 ◽  
Vol 12 ◽  
pp. 224-231 ◽  
Author(s):  
Peter Stritt ◽  
Rudolf Weber ◽  
Thomas Graf ◽  
Steffen Müller ◽  
Christian Ebert
Keyword(s):  
Heat Conduction ◽  
Laser Power ◽  
Deep Penetration ◽  
Power Modulation ◽  
Deep Penetration Welding

Analysis of Characteristics of Mg Alloy Welded Joint by Laser Welding

2011 ◽  
Vol 314-316 ◽  
pp. 949-952
Author(s):  
Hong Jian Xiu ◽  
Jun Liu ◽  
Jun Hui Dong ◽  
Ping Xu
Keyword(s):  
Heat Conduction ◽  
Laser Welding ◽  
Weld Metal ◽  
Welding Speed ◽  
Heat Input ◽  
Welded Joint ◽  
Mg Alloy ◽  
Deep Penetration ◽  
Deep Penetration Welding ◽  
Main Factor

The microstructure, the regular and mechanism of various parameters on formation of weld bead of Mg alloy AMCa403 using a laser welding were investigated. The results show that sound welds without major defects can be produced. Two welding modes of deep penetration welding, heat conduction welding were found, and heat input was found to be the main factor for welding mode and shape. The microstructure of weld metal is significantly finer than the base metal. At the same power, with the increase of welding speed, the microstructure of weld metal is much finer.

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.

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

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.

scholarly journals Suppression of Porosity by Laser Power Modulation

2007 ◽  
Vol 25 (2) ◽  
pp. 328-335 ◽  
Author(s):  
Isao KAWAGUCHI ◽  
Susumu TSUKAMOTO ◽  
Goro ARAKANE ◽  
Kazuhiro NAKATA
Keyword(s):  
Laser Power ◽  
Power Modulation
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