scholarly journals Influence of oscillation frequency and focal diameter on weld pool geometry and temperature field in laser beam welding of high strength steels

Procedia CIRP ◽  
2018 ◽  
Vol 74 ◽  
pp. 470-474 ◽  
Author(s):  
Vincent Mann ◽  
Konstantin Hofmann ◽  
Kerstin Schaumberger ◽  
Tobias Weigert ◽  
Stephan Schuster ◽  
...  
Keyword(s):  
Temperature Field ◽  
Laser Beam ◽  
Weld Pool ◽  
Oscillation Frequency ◽  
Laser Beam Welding ◽  
High Strength Steels ◽  
High Strength ◽  
Weld Pool Geometry

scholarly journals Microstructure of Joints Made in High-Strength Steels Using the Robotic Laser Beam Welding Process

2020 ◽  
pp. 91-97
Author(s):  
Lechosław Tuz ◽  
Krzysztof Sulikowski
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Hardness Distribution ◽  
Key Factors ◽  
Welding Technology ◽  
Heat Treated ◽  
Made In

The paper presents the evaluation of weldability of unalloyed high strength heat-treated steels using of a laser beam welding robotic station. The key factors and properties affecting the usability of the aforesaid welding technology when welding the above-named steels were identified on the basis of the assessment of the microstructure and the measurements of hardness distribution in the related butt welded joints.

scholarly journals Reduced finite-volume model for the fast numerical calculation of the fluid flow in the melt pool in laser beam welding

2021 ◽  
Vol 1135 (1) ◽  
pp. 012010
Author(s):  
Jonas Wagner ◽  
Peter Berger ◽  
Philipp He ◽  
Florian Fetzer ◽  
Rudolf Weber ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Laser Beam ◽  
Finite Volume ◽  
Weld Pool ◽  
Welding Speed ◽  
Laser Beam Welding ◽  
Melt Flow ◽  
Finite Volume Model ◽  
Volume Model ◽  
Weld Pool Geometry

Abstract In this paper we propose a reduced two-dimensional finite-volume model for the fast calculation of the melt flow. This model was used to determine the influence of the welding speed, viscosity in the melt and vapour flow inside of the keyhole on the fluid flow field, the temperature distribution, and the resulting weld-pool geometry for laser beam welding of aluminium. The reduced computational time resulting from this approach allows the fast qualitative investigation of different aspects of the melt flow over a wide range of parameters. It was found that the effect of viscosity within the melt is more pronounced for lower welding speeds whereas the effect of friction at the keyhole walls is more pronounced for higher welding speeds. The weld-pool geometry mainly depends on the welding speed.

Modelling of the Heat Flux Density Distribution for Laser Beam Welding

2011 ◽  
Vol 183 ◽  
pp. 241-248 ◽  
Author(s):  
A. Marmołowski ◽  
W. Kiełczyński
Keyword(s):  
Heat Source ◽  
Laser Beam ◽  
Flux Density ◽  
Weld Pool ◽  
Thermal Field ◽  
Laser Beam Welding ◽  
Butt Joint ◽  
Numerical Calculations ◽  
Model Parameters ◽  
Weld Pool Geometry

Great interest of the laser beam welding in industry is a new theoretical task, making planning the welding procedure specification and the quality control of welded joints easier. Estimating and calculating the dimensions of a weld pool and temperature distribution near weld mainly concern heat source modelling. In the presented work calculations of welding pool shape and thermal field for cylindrical-powered-normally model of heat source have been presented. Parameters of the model of heat source and weld pool geometry were determined using analytical-numerical calculations. The results of numerical calculations were compared with the experimental data for butt joint made by CO2 laser beam. Comparable results have been observed. Practical recommendations for assumptions of model parameters - the flux density energy distribution of the heat source in case of calculations of the thermal field in the vicinity of a weld pool are given.

Numerical simulation of weld pool geometry in laser beam welding

2000 ◽  
Vol 33 (6) ◽  
pp. 662-671 ◽  
Author(s):  
W Sudnik ◽  
D Radaj ◽  
S Breitschwerdt ◽  
W Erofeew
Keyword(s):  
Numerical Simulation ◽  
Laser Beam ◽  
Weld Pool ◽  
Laser Beam Welding ◽  
Weld Pool Geometry

scholarly journals Testing of New Materials and Computer Aided Optimization of Laser Beam Welding of High-Strength Steels

2015 ◽  
Vol 78 ◽  
pp. 255-264 ◽  
Author(s):  
M. Sokolov ◽  
A. Salminen ◽  
E.I. Khlusova ◽  
M.M. Pronin ◽  
M. Golubeva ◽  
...  
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
High Strength Steels ◽  
High Strength ◽  
New Materials ◽  
Computer Aided

Laser Beam Welding of Advanced High-Strength Steels (Dual Phase Steels)

2021 ◽  
pp. 141-148
Author(s):  
P. V. S. Lakshminarayana ◽  
Jai Prakash Gautam ◽  
P. Mastanaiah ◽  
G. Madhusudan Reddy ◽  
K. Bhanu Sankara Rao
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
High Strength Steels ◽  
High Strength ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Advanced High Strength Steels

Laser Beam Welding of New High Strength Steels for Auto Body Construction

2007 ◽  
Vol 344 ◽  
pp. 723-730 ◽  
Author(s):  
H. Haferkamp ◽  
O. Meier ◽  
K. Harley
Keyword(s):  
Laser Beam ◽  
Weld Seam ◽  
Laser Beam Welding ◽  
High Strength Steels ◽  
High Strength ◽  
Absorption Capacity ◽  
Manganese Steel ◽  
New Materials ◽  
Ultra High Strength Steels ◽  
Iron Manganese

With the regard to the development of modern car bodies the focus lies on low production costs, environmental sustainability and high security standards. In order to meet these requirements the weight of modern car bodies has to be reduced consistently. Amongst other things, this becomes possible by the use of new high and ultra high strength steels. These materials are characterised by their high strength, good ductility and a high absorption capacity. In addition they have a lower density in comparison to other steels. TRIP and TWIP steel belong to these high and ultra high strength steels as well as iron-manganese steel. The development of new materials also puts new demands on the joining technologies used for producing semi finished products and parts of car bodies. Due to its high flexibility, its good automation and the minor influence on the work piece, laser beam welding is an established procedure in the automotive series production. The high cooling rates in combination with a carbon equivalent of the new materials which is usually higher then 0.4% lead to a martensitic solidification of the weld seam. Martensite is characterized by its low ductility and thus affects the forming capability as well as the absorption capacity of the welded parts. In order to avoid this effect a new process has been developed within the scope of the collaborative research program 362 (SFB 362, 1993-2005) at the Laser Zentrum Hannover. Using that process the weld seam structure is inductively annealed directly after the welding process. Experiments with high strength steel like TRIP700 and H320LA have shown that the tempering leads to an increase of ductility. The process is suitable for butt joints and overlap joints and is to be transferred into industrial usage within the scope of the project “Laser Beam Welding of Car Body Parts Made of High and Ultra High Strength Steel”. Based on the results obtained in the SFB 362 continuous investigations will be made in order to qualify the process for boron alloyed steel and iron-manganese steel.

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