Energy Efficient Laser Beam Welding of Metals with a Ultra-High Brightness Direct-Diode Laser System

2015 ◽  
Vol 805 ◽  
pp. 162-170 ◽  
Author(s):  
Artur Laukart ◽  
Michael Dobler ◽  
Stefanie Kohl ◽  
Haro Fritsche ◽  
Andreas Grohe ◽  
...  
Keyword(s):  
Power Consumption ◽  
Laser Beam ◽  
Numerical Simulations ◽  
Diode Laser ◽  
Laser Beam Welding ◽  
Laser Wavelength ◽  
Efficient Production ◽  
High Brightness ◽  
Laser Systems ◽  
Conventional Laser

The rising level of automation in the automotive industry also involves the use of more and more machines and with that an increase in power consumption. This requires the employment of more efficient production processes with higher efficiency. Laser beam welding offers the opportunity to substitute conventional laser sources like solid state lasers with ultra-high brightness direct-diode laser systems which have the advantage of less power consumption at a comparable beam quality. However, the absorption of laser radiation on metallic surfaces depends on the wavelength, thus the effect of the direct-diode laser wavelength on the welding process has to be investigated. In our research the effect of the laser wavelength on energy efficiency was studied by means of numerical simulations. Furthermore, experimental investigations were carried out to validate the numerical solutions. Different aluminum alloys and steel materials which are used in the automotive environment were investigated within the experiments. Due to the current lack of direct-diode laser systems with a laser power comparable to conventional laser systems, numerical simulations were also used to analyze these future systems. Thus we were able to assess the increase of efficiency in laser beam welding which will be achievable with future high-power direct-diode laser systems.

scholarly journals Experimental and Numerical Investigations of Laser Beam Welding with an Ultra-high Brightness Direct-diode Laser

2016 ◽  
Vol 83 ◽  
pp. 1397-1403 ◽  
Author(s):  
Artur Laukart ◽  
Stefanie Kohl ◽  
Haro Fritsche ◽  
Andreas Grohe ◽  
Bastian Kruschke ◽  
...  
Keyword(s):  
Laser Beam ◽  
Diode Laser ◽  
Laser Beam Welding ◽  
High Brightness ◽  
Numerical Investigations

scholarly journals Pulsed UV Laser Processing of Carbosilane and Silazane Polymers

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 372 ◽  
Author(s):  
Samuel Ligon ◽  
Gurdial Blugan ◽  
Jakob Kuebler
Keyword(s):  
Laser Beam ◽  
Laser Processing ◽  
Scanning Speed ◽  
Inert Atmosphere ◽  
Laser Wavelength ◽  
Uv Laser ◽  
Glass Substrates ◽  
Polymer Precursors ◽  
Laser Systems ◽  
Pre Treatment

Freestanding SiCNO ceramic pieces with sub-mm features were produced by laser crosslinking of carbosilane and silazane polymer precursors followed by pyrolysis in inert atmosphere. Three different pulsed UV laser systems were investigated, and the influence of laser wavelength, operating power and scanning speed were all found to be important. Different photoinitiators were tested for the two lasers operating at 355 nm, while for the 266 nm laser, crosslinking occurred also without photoinitiator. Pre-treatment of glass substrates with fluorinated silanes was found to ease the release of green bodies during solvent development. Polymer crosslinking was observed with all three of the laser systems, as were bubbles, surface charring and in some cases ablation. By focusing the laser beam several millimeters above the surface of the resin, selective polymer crosslinking was observed exclusively.

High brightness diode laser systems as direct cutting tools

2014 ◽  
Author(s):  
H. Wahab ◽  
J. Gröninger ◽  
K. Dickmann ◽  
P. Bruns ◽  
M. Voß ◽  
...  
Keyword(s):  
Diode Laser ◽  
Cutting Tools ◽  
High Brightness ◽  
Laser Systems ◽  
Direct Cutting

Methods for Slow Axis Beam Quality Improvements Leading to High Brightness Multi-kW Direct Diode Laser Systems

2014 ◽  
Author(s):  
Haiyan An ◽  
Yihan Xiong ◽  
Ching-Long Jiang ◽  
Berthold Schmidt ◽  
Georg Treusch
Keyword(s):  
Diode Laser ◽  
Beam Quality ◽  
Quality Improvements ◽  
High Brightness ◽  
Slow Axis ◽  
Laser Systems

Developments and Trends in Laser Welding of Sheet Metal

2005 ◽  
Vol 6-8 ◽  
pp. 59-70 ◽  
Author(s):  
Frank Vollertsen
Keyword(s):  
Laser Beam ◽  
Sheet Metal ◽  
Spot Welding ◽  
Laser Beam Welding ◽  
Hot Cracking ◽  
Thick Sheet ◽  
Laser Systems ◽  
Thick Sheet Metal ◽  
Metal Welding ◽  
Remarkable Progress

There is some remarkable progress in laser beam welding of sheet metal which is driven by the advent of improved laser systems and process technologies. Here, potentials for reducing distortion and avoiding hot cracking are highlighted, and examples of current developments are given in the field of thin and thick sheet metal welding including spot welding of difficult-to-weld materials and material combinations.

scholarly journals Investigation of Metallurgical and Mechanical Properties of Laser Beam Welded and Post-weld Heat Treated DP1400 Steel

2021 ◽  
Author(s):  
Raghawendra P. S. Sisodia ◽  
Marcell Gáspár
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Diode Laser ◽  
Lath Martensite ◽  
Laser Beam Welding ◽  
Sheet Thickness ◽  
Ductile Failure ◽  
Tensile Tests ◽  
Coarse Grained ◽  
Weld Heat

AbstractIn this paper, the effect of autogenous diode laser beam welding (LBW) and the influence of post weld heat treatment (PWHT) on microstructural changes and mechanical properties of dual phase DP1400 high strength steel (HSS) butt welded joint are studied and presented. LBW and PWHT were performed on 1 mm sheet thickness using 3 and 5 kW diode laser systems, respectively. The technology ensures high quality welded joints in HSS and facilitate the welding and PWHT by same process and equipment. Microstructure evaluation was performed using optical and scanning electron microscopy. Related to the mechanical properties, tensile tests, fractography of fractured tensile specimens and three-point bending tests were carried out. The microstructural examination presented the constituents of martensite and ferrite in the heat affected zone (HAZ) and fusion zone (FZ) consists of predominantly lath martensite with ferrite and some bainite. Tempered martensite was observed after PWHT in HAZ and FZ. The hardening peaks observed in coarse-grained and fine-grained subzones were significantly reduced by the novelty technology, i.e. PWHT and thereby cold cracking sensitivity. The fractography of the fractured tensile specimens showed characteristic features of ductile failure.

scholarly journals Laser beam welding setup for the coaxial combination of two laser beams to vary the intensity distribution

2022 ◽  
Author(s):  
M. Möbus ◽  
P. Woizeschke
Keyword(s):  
Laser Beam ◽  
Penetration Depth ◽  
Intensity Distribution ◽  
Laser Beam Welding ◽  
Sample Surface ◽  
Laser Beams ◽  
Deep Penetration ◽  
Focal Position ◽  
Laser Systems ◽  
Laser Sources

AbstractDeep-penetration laser beam welding is highly dynamic and affected by many parameters. Several investigations using differently sized laser spots, spot-in-spot laser systems, and multi-focus optics show that the intensity distribution is one of the most influential parameters; however, the targeted lateral and axial intensity design remains a major challenge. Therefore, a laser processing optic has been developed that coaxially combines two separate laser sources/beams with different beam characteristics and a measuring beam for optical coherence tomography (OCT). In comparison to current commercial spot-in-spot laser systems, this setup not only makes it possible to independently vary the powers of the two laser beams but also their focal planes, thus facilitating the investigation into the influence of specific energy densities along the beam axis. First investigations show that the weld penetration depth increases with increasing intensities in deeper focal positions until the reduced intensity at the sample surface, due to the deep focal position, is no longer sufficient to form a stable keyhole, causing the penetration depth to drop sharply.

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