Structural Behavior of an EN AW-6060 Profile during and Immediately after Welding by a Laser-Laser-Hybrid System

2006 ◽  
Vol 10 ◽  
pp. 133-142 ◽  
Author(s):  
Michael F. Zäh ◽  
Sven Roeren
Keyword(s):  
Residual Stresses ◽  
Hybrid System ◽  
Fe Simulation ◽  
Laser System ◽  
Structural Behavior ◽  
Welded Structure ◽  
Cooling Phase ◽  
Laser Hybrid ◽  
Power Diode ◽  
High Power Diode Laser

This paper describes the analysis of thermal and mechanical effects during welding and the following cooling-phase on a welded structure. An off-the-shelf aluminum-profile, as used in other simulation sub-projects of the research center, was chosen as a sample part for the simulation tests. Taking up an important production scenario of lightweight-production, the frontal closing of two profiles is modeled. The development of residual stresses and the distortion is investigated by a thermo-mechanical FE-simulation. The virtually examined process is provided by a hybrid, bifocal laser system consisting of both an Nd:YAG-laser and a high power diode laser (HPDL). For comparison, a single Nd:YAG-process was simulated, too. The theoretically different generation of residual stresses can be verified within the simulation.

High-power diode laser system near 1 μm and comparative tissue interaction studies

1994 ◽  
Author(s):  
Charles G. Dupuy ◽  
C. J. Hwang ◽  
David Benenati ◽  
H. Thomas Simmonds ◽  
Richard J. Fu ◽  
...  
Keyword(s):  
Diode Laser ◽  
High Power ◽  
Laser System ◽  
Tissue Interaction ◽  
Interaction Studies ◽  
Power Diode ◽  
High Power Diode Laser

Laser Bifocal Hybrid Welding of Aluminum

2006 ◽  
Vol 10 ◽  
pp. 65-78 ◽  
Author(s):  
Andreas Trautmann ◽  
Michael F. Zäh
Keyword(s):  
Energy Transfer Efficiency ◽  
Experimental Investigations ◽  
Hybrid Welding ◽  
Melt Pool ◽  
Laser Hybrid Welding ◽  
Laser Hybrid ◽  
Power Diode ◽  
High Power Diode Laser ◽  
Welding System ◽  
Conduction Mode

This paper renders research into the fundamentals governing the melt pool dynamics of a hybrid bifocal laser welding system consisting of an Nd:YAG and a high power diode laser (HPDL). The resulting superposition of keyhole by heat conduction mode welding is assayed for extruded aluminum. In particular the diffusion of the surface oxygen layer is considered. By comparing the results attainable by bifocal laser hybrid welding to the constituent laser processes synergetic effects of the laser hybrid can be demonstrated. These are namely the doubling of the welding speed from 2.0 min-1 to 4.0 m min-1, the reduction of the roughness of the weld surface from 60 om to approximately 10 om and an increase in energy transfer efficiency. The experimental investigations verifying these synergies are outlined and discussed.

Study of Residual Stress Surface Distribution on Laser Welded Steel Sheets

2013 ◽  
Vol 486 ◽  
pp. 3-8 ◽  
Author(s):  
Zdenek Pala ◽  
Kamil Kolařík ◽  
Nikolaj Ganev ◽  
Jiří Čapek
Keyword(s):  
Residual Stresses ◽  
Laser Beam ◽  
Laser Welding ◽  
Diode Laser ◽  
High Power ◽  
The Body ◽  
Laser Weld ◽  
Steel Sheets ◽  
Power Diode ◽  
High Power Diode Laser

Advent of high power diode laser has substantially contributed to the popularity of laser welding in industry where its virtues such as low heat input and good weld strength are highly appreciated. However, one of the drawbacks of the laser welding is distortion of the welded bodies that is closely linked with the generation and/or redistribution of residual stresses in the vicinity of the weld. In this contribution, mapping of surface macroscopic residual stresses in two directions, i.e. parallel and perpendicular to the welds, were performed for two bodies. The first contained a weld created with the high power diode laser beam speed of 2 m/min and the second with the speed of 15 m/min. Our aim was to compare not only resulting fields of residual stresses, but also to perform qualitative assessment of the possible presence of crystallographic texture and gain a qualitative apprehension about the grain sizes in the vicinity of a laser weld joining two steel sheets. Larger distortion of the body with a laser weld is exhibited by the sample manufactured with approximately 8 times bigger speed of laser beam. This sample is in the immediate vicinity characterized by substantial compressive residual stresses in the direction perpendicular to the weld.

Optical design and development of a fiber coupled high-power diode laser system for laser transmission welding of plastics

2012 ◽  
Vol 51 (12) ◽  
pp. 124301 ◽  
Author(s):  
Eva Rodríguez-Vidal ◽  
Iban Quintana ◽  
Jon Etxarri ◽  
Urko Azkorbebeitia ◽  
Deitze Otaduy ◽  
...  
Keyword(s):  
Diode Laser ◽  
High Power ◽  
Laser System ◽  
Optical Design ◽  
Design And Development ◽  
Laser Transmission Welding ◽  
Power Diode ◽  
High Power Diode Laser
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