Validating predictions of keyholing phenomenon in laser weld models

2002 ◽  
Author(s):  
Aaron Hall ◽  
Allen Roach ◽  
Gerald Knorovsky
Keyword(s):  
Laser Weld

PREDICTION OF LASER WELD BEAD PROFILE THROUGH AN INVERSE PROBLEM APPROACH

2018 ◽  
Author(s):  
Elisan dos Santos Magalhães ◽  
Luiz Eduardo dos Santos Paes ◽  
Milton Pereira ◽  
Sandro Metrevelle Marcondes de Lima e Silva
Keyword(s):  
Inverse Problem ◽  
Weld Bead ◽  
Laser Weld ◽  
Bead Profile

scholarly journals Microstructural Characterization of Laser Weld of Hot-Stamped Al-Si Coated 22MnB5 and Modification of Weld Properties by Hybrid Welding

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3943
Author(s):  
Hana Šebestová ◽  
Petr Horník ◽  
Šárka Mikmeková ◽  
Libor Mrňa ◽  
Pavel Doležal ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Fusion Zone ◽  
Microstructural Characterization ◽  
Tensile Tests ◽  
Laser Weld ◽  
Martensitic Microstructure ◽  
Laser Welds ◽  
Weld Properties ◽  
Weld Fusion Zone

The presence of Al-Si coating on 22MnB5 leads to the formation of large ferritic bands in the dominantly martensitic microstructure of butt laser welds. Rapid cooling of laser weld metal is responsible for insufficient diffusion of coating elements into the steel and incomplete homogenization of weld fusion zone. The Al-rich regions promote the formation of ferritic solid solution. Soft ferritic bands cause weld joint weakening. Laser welds reached only 64% of base metal's ultimate tensile strength, and they always fractured in the fusion zone during the tensile tests. We implemented hybrid laser-TIG welding technology to reduce weld cooling rate by the addition of heat of the arc. The effect of arc current on weld microstructure and mechanical properties was investigated. Thanks to the slower cooling, the large ferritic bands were eliminated. The hybrid welds reached greater ultimate tensile strength compared to laser welds. The location of the fracture moved from the fusion zone to a tempered heat-affected zone characterized by a drop in microhardness. The minimum of microhardness was independent of heat input in this region.

scholarly journals Influence of process parameters on thermal cycle and intermetallic compounds formation in high speed laser weld-brazing of aluminium-steel angle joints

2018 ◽  
Vol 26 ◽  
pp. 690-699 ◽  
Author(s):  
Guillaume Filliard ◽  
Mohamed El Mansori ◽  
Mathieu De Metz-Noblat ◽  
Christian Bremont ◽  
Anthony Reullier ◽  
...  
Keyword(s):  
Intermetallic Compounds ◽  
Process Parameters ◽  
Thermal Cycle ◽  
High Speed ◽  
Laser Weld ◽  
Influence Of Process Parameters ◽  
Steel Angle

Monitoring of laser weld penetration using sensor fusion

2002 ◽  
Vol 14 (2) ◽  
pp. 114-121 ◽  
Author(s):  
Allen Sun ◽  
Elijah Kannatey-Asibu ◽  
Mark Gartner
Keyword(s):  
Sensor Fusion ◽  
Weld Penetration ◽  
Laser Weld

scholarly journals Macro-Modelling of Laser Micro-Joints for Understanding Joint Strength in Electric Vehicle Battery Interconnects

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3552
Author(s):  
Abhishek Das ◽  
Richard Beaumont ◽  
Iain Masters ◽  
Paul Haney
Keyword(s):  
Joint Strength ◽  
Structural Model ◽  
Design Stage ◽  
Structural Modelling ◽  
Laser Weld ◽  
Computationally Efficient ◽  
Early Design Stage ◽  
Lap Shear ◽  
Battery Module ◽  
Modelling Approach

Laser micro-welding is increasingly being used to produce electrically conductive joints within a battery module of an automotive battery pack. To understand the joint strength of these laser welds at an early design stage, micro-joints are required to be modelled. Additionally, structural modelling of the battery module along with the electrical interconnects is important for understanding the crash safety of electric vehicles. Fusion zone based micro-modelling of laser welding is not a suitable approach for structural modelling due to the computational inefficiency and the difficulty of integrating with the module model. Instead, a macro-model which computationally efficient and easy to integrate with the structural model can be useful to replicate the behaviour of the laser weld. A macro-modelling approach was adopted in this paper to model the mechanical behaviour of laser micro-weld. The simulations were based on 5 mm diameter circular laser weld and developed from the experimental data for both the lap shear and T-peel tests. This modelling approach was extended to obtain the joint strengths for 3 mm diameter circular seams, 5 mm and 10 mm linear seams. The predicted load–displacement curves showed a close agreement with the test data.

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