CO laser deep-penetration welding: a comparative study to CO2 laser welding

1995 ◽  
Author(s):  
Martin Schellhorn ◽  
Hartwig von Buelow
Keyword(s):  
Laser Welding ◽  
Comparative Study ◽  
Co2 Laser ◽  
Deep Penetration ◽  
Co Laser ◽  
Laser Deep Penetration Welding ◽  
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.

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

Numerical Simulation of Temperature Field during Laser Deep Penetration Welding

2011 ◽  
Vol 675-677 ◽  
pp. 865-867
Author(s):  
Ren Ping Wang ◽  
Y.P. Lei
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Computational Analysis ◽  
Energy Equation ◽  
304 Stainless Steel ◽  
Deep Penetration ◽  
Governing Equations ◽  
Laser Deep Penetration Welding ◽  
Deep Penetration Welding ◽  
Laser Keyhole Welding

A computational analysis is achieved during laser deep penetration welding. Multiple reflection and absorption are implemented simultaneously with the ray tracing technique in the keyhole. With all the governing equations including continuity, momentum and energy equation, the VOF method is adopted to trace the free surface of the molten pool. Temperature field is achieved by numerical simulation. The laser keyhole welding experiments on 304 stainless steel sheet showed that the computational results agree well with experimental results.

Microstructure and Mechanical Properties of Aluminum Alloy/High Strength Steel Double Beam Laser Deep Penetration Welded Joint

2019 ◽  
Vol 944 ◽  
pp. 448-457
Author(s):  
Hong Xi Chen ◽  
Li Cui ◽  
Dong Qi Lu ◽  
Yao Qing Chang ◽  
Xu Xia ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Strength Steel ◽  
High Strength ◽  
Deep Penetration ◽  
Mechanical Resistance ◽  
Lap Joint ◽  
Beam Laser ◽  
Double Beam ◽  
Laser Deep Penetration Welding ◽  
Deep Penetration Welding

A new dual beam laser deep penetration welding technology for lap joint of 1.5 mm thick aluminum alloy and high strength steel was explored in this paper, and the effects of three different beam energy ratios (RS=0.25,0.33,0.5) on weld formation, interface microstructure and mechanical properties were studied. The result shows that under certain conditions of other parameters, double beam laser deep penetration welding process can be applied to lap joint of aluminum alloy / high strength steel with good weld shape when RS=0.25,0.33,0.5. As RS increases from 0.25 to 0.5, the penetration of the weld reduces from 575 μm to 424.2μm, the thickness of intermetallic compound (IMC) layer at the interface between aluminum alloy and weld metal reduces from 3.4 μm to 2.5 μm, the average microhardness of the IMC layer decreases from 771.1 HV to 571.9 HV, the mechanical resistance of the joint raises from 95.7N/mm to 115.2N/mm. When RS=0.5, double beam laser deep penetration welding of aluminum alloy / high-strength steel joints has the highest mechanical resistance of joints, because of the relatively good plastic ductility of the joint.

Optic-Electrical Signal Analysis of Plasma Fluctuation Characteristics in Laser Deep Penetration Welding

2018 ◽  
Vol 45 (4) ◽  
pp. 0402001
Author(s):  
邱文聪 Qiu Wencong ◽  
杨立军 Yang Lijun ◽  
刘桐 Liu Tong ◽  
赵德金 Zhao Dejin
Keyword(s):  
Signal Analysis ◽  
Electrical Signal ◽  
Deep Penetration ◽  
Laser Deep Penetration Welding ◽  
Plasma Fluctuation ◽  
Deep Penetration Welding
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