Influence of remote-laser-welding parameters for an 8 kW fibre laser on the seam quality of steels

2008 ◽  
Author(s):  
Florian Oefele ◽  
Jan Musiol ◽  
Michael F. Zaeh
Keyword(s):  
Laser Welding ◽  
Fibre Laser ◽  
Welding Parameters ◽  
Remote Laser Welding

scholarly journals Dissimilar Metals Laser Welding between DP1000 Steel and Aluminum Alloy 1050

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 102 ◽  
Author(s):  
António Pereira ◽  
Ana Cabrinha ◽  
Fábio Rocha ◽  
Pedro Marques ◽  
Fábio Fernandes ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Laser Welding ◽  
Mechanical Tests ◽  
Welding Parameters ◽  
Dissimilar Metals ◽  
Butt Welding ◽  
Electron Microscopes ◽  
1050 Aluminum Alloy ◽  
Scanning Electron Microscopes

The welding of dissimilar metals was carried out using a pulsed Nd: YAG laser to join DP1000 steel and an aluminum alloy 1050 H111. Two sheets of each metal, with 30 × 14 × 1 mm3, were lap welded, since butt welding proved to be nearly impossible due to the huge thermal conductivity differences and melting temperature differences of these materials. The aim of this research was to find the optimal laser welding parameters based on the mechanical and microstructure investigations. Thus, the welded samples were then subjected to tensile testing to evaluate the quality of the joining operation. The best set of welding parameters was replicated, and the welding joint obtained using these proper parameters was carefully analyzed using optical and scanning electron microscopes. Despite the predicted difficulties of welding two distinct metals, good quality welded joints were achieved. Additionally, some samples performed satisfactorily well in the mechanical tests, reaching tensile strengths close to the original 1050 aluminum alloy.

Effect of Laser Welding Parameters on Forming Behavior of Tailor Welded Blanks

2012 ◽  
Vol 445 ◽  
pp. 406-411 ◽  
Author(s):  
R. Safdarian Korouyeh ◽  
Hassan Moslemi Naeini ◽  
M.J. Torkamany ◽  
J. Sabaghzadee
Keyword(s):  
Laser Welding ◽  
Nd:Yag Laser ◽  
Dissimilar Materials ◽  
Uniaxial Tensile ◽  
Welding Parameters ◽  
Uniaxial Tensile Test ◽  
Tailor Welded Blanks ◽  
Weld Properties ◽  
Single Sheet

Tailor Welded Blanks (TWB) are blanks in which two or more sheets of similar or dissimilar materials, thicknesses, coatings etc. are welded together to form a single sheet before forming. Forming behavior of TWBs is affected by thickness ratio, strength ratio, weld conditions such as weld properties, weld orientation, weld location etc. In this work, Nd:YAG laser welding will be use to weld TWB with different thickness in experimental test. Nd:YAG laser welding parameters such as pulse duration, welding velocity, frequency and peak power will affect formability of TWBs. Taguchis design of experiments methodology is followed to design of experiment and obtain the percentage contribution of factors considered. Erichsen formability test and uniaxial tensile test (ASTM-E8) will be use in experiment setup to compare result of different welding parameters on formability quality of TWBs.

In the Jewelry, Brazing and Laser Welding with Parameter Optimization

2012 ◽  
Vol 57 (2) ◽  
pp. 525-537
Author(s):  
M. Kallek ◽  
S. Ataoglu ◽  
Y. Yagci ◽  
H. Bozkurt ◽  
A. Gulluoglu
Keyword(s):  
Laser Welding ◽  
Parameter Optimization ◽  
The Other ◽  
Welding Parameters ◽  
Gold Alloys ◽  
Carat Gold ◽  
Weld Joints ◽  
Different Color ◽  
Jewelry Industry

In the Jewelry, Brazing and Laser Welding with Parameter OptimizationIn this study, brazing and laser welding were experimentally compared for 9, 14 and 18 carat gold alloys in different color. The gold alloys were joined by laser welding and brazing and the microstructure, hardness, chemical composition, color of the weld joints were investigated. According to study, in laser welding, voltage, pulse duration, pulse diameter and frequency are the most important welding parameters that influence the quality of joints. Welded joints are characterized using three geometric parameters: penetration depth, width of heat affected zone and underfill defects. Finally, optimum laser welding parameters of different color of 9, 14 and 18 carat gold alloys were determined. It is observed that laser welding has numerous advantages compared to the other joining techniques used in the jewelry industry.

scholarly journals Power Control during Remote Laser Welding Using a Convolutional Neural Network

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6658
Author(s):  
Alex Božič ◽  
Matjaž Kos ◽  
Matija Jezeršek
Keyword(s):  
Neural Network ◽  
Laser Welding ◽  
Convolutional Neural Network ◽  
Welding Parameters ◽  
Interaction Zone ◽  
Full Penetration ◽  
Optical Triangulation ◽  
Advanced Control ◽  
Metal Sheets ◽  
Remote Laser Welding

The increase in complex workpieces with changing geometries demands advanced control algorithms in order to achieve stable welding regimes. Usually, many experiments are required to identify and confirm the correct welding parameters. We present a method for controlling laser power in a remote laser welding system with a convolutional neural network (CNN) via a PID controller, based on optical triangulation feedback. AISI 304 metal sheets with a cumulative thickness of 1.5 mm were used. A total accuracy of 94% was achieved for CNN models on the test datasets. The rise time of the controller to achieve full penetration was less than 1.0 s from the start of welding. The Gradient-weighted Class Activation Mapping (Grad-CAM) method was used to further understand the decision making of the model. It was determined that the CNN focuses mainly on the area of the interaction zone and can act accordingly if this interaction zone changes in size. Based on additional testing, we proposed improvements to increase overall controller performance and response time by implementing a feed-forward approach at the beginning of welding.

Research on Laser Micro Welding of an Aluminum Alloy Pressure Sensor

2015 ◽  
Vol 1114 ◽  
pp. 160-165 ◽  
Author(s):  
Robert Ciobanu ◽  
Octavian Donţu ◽  
Daniel Besnea ◽  
Victor Constantin ◽  
Doina Cioboata
Keyword(s):  
Aluminum Alloy ◽  
Laser Welding ◽  
Surrounding Medium ◽  
Laser Beam Welding ◽  
Pressure Sensors ◽  
Welding Process ◽  
Welding Parameters ◽  
Surface Pretreatment ◽  
Very High

This paper presents in detail the laser welding of a new mechatronic component belonging to the pressure sensors made ​​by aluminum alloy AW2007. Due to very high reflectivity of aluminum alloys, fast oxidation, the absorption of gases from the surrounding medium, special difficulties arise at laser beam welding and most situations require appropriate surface pretreatment. Given these issues, the paper present an experimental study on the influence of welding parameters on the seam quality for the aluminum alloy AW2007. In addition of the study regarding the influence of welding parameters, such as, laser power, welding speed, we conducted an analysis on the influence of the initial temperature of the material on the quality of the weld. Besides these aspects the paper presents a constructive solution for a device used to optimize the laser welding process of the sensor.

Coupled Computational Fluid Dynamic and Finite Element Multiphase Modeling of Laser Weld Bead Geometry Formation and Joint Strengths

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
S. Marimuthu ◽  
R. M. Eghlio ◽  
A. J. Pinkerton ◽  
L. Li
Keyword(s):  
Laser Welding ◽  
Fluid Dynamic ◽  
Weld Bead ◽  
Surface Topology ◽  
Fibre Laser ◽  
Welding Parameters ◽  
Bead Geometry ◽  
Weld Quality ◽  
Weld Bead Geometry ◽  
Cross Sectional

Laser welding is used extensively in industry for joining various materials in the assembly of components and structures. Localized melting followed by rapid cooling results in the formation of a weld bead and generation of residual stress. Selection of the appropriate combination of input parameters and understanding their effects is important to achieve the required weld quality with a smooth welding surface. In the present work, a sequentially coupled thermo-structural multiphase analysis was carried out with the objectives of predicting the effect of laser parameters on the change in surface topology of the weld bead and its subsequent effect on structural properties. The work shows that the laser welding parameters strongly affect the weld bead shape, which eventually affects the weld quality. A net shaped weld bead demonstrates better performance in terms of stress distribution and distortion than other weld bead shapes. The numerical simulation results were compared with the experimental observations performed on a mild steel sheet using a fibre laser and the results are in good agreement in terms of weld bead cross-sectional profile and strength.

scholarly journals Analysis of Autogenous Laser Welding in Low Carbon and Large Thickness Steel

2021 ◽  
Vol 4 (2) ◽  
Author(s):  
Daniel Kohls ◽  
Carlos Enrique Ninõ Bohorquez ◽  
Enori Gemilli ◽  
Majorie Anacleto Bernardo
Keyword(s):  
Laser Welding ◽  
Filler Metal ◽  
Base Material ◽  
Welding Parameters ◽  
Low Carbon ◽  
Protective Layers ◽  
Welding Defects ◽  
Welding Processes ◽  
Random Defects

With the use of laser welding, it is possible to join different steel, with different thicknesses, with or without the action of protective layers. The quality of laser radiation makes it possible to get certain characteristics that are impossible to get by other processes, such as high welding speeds, less metallurgical effects suffered by the heat-affected zone (ZAC), and this process also does not require filler metal, therefore it is free from possible contamination. Combined with traditional welding methods, laser welding produces narrower weld beads, allowing for better prevention of corrosion and thermal distortions. Although the process already has high industrial knowledge, some random defects, such as porosities and inconsistencies, are still found. This work presents a systematic study to determine the influence of laser welding parameters and how these parameters influence welding defects. For this, the experimental part was carried out in the welding laboratory - LABSOLDA, of the Federal University of Santa Catarina - UFSC, during the laser welding processes, a welding speed of 2.4 m/min was reached. For this experiment, argon was used as a shielding gas and 1020 steel was used as the base material.

scholarly journals Weld Geometry Investigation on Dissimilar Boron Steel Laser Welded for TWB Application

2019 ◽  
Vol 16 (4) ◽  
pp. 7364-7374
Author(s):  
M. N. M. Salleh ◽  
M. Ishak ◽  
M. H. Aiman ◽  
M. M. Quazi ◽  
A. M. Hanafi
Keyword(s):  
Tensile Strength ◽  
Laser Welding ◽  
Low Power ◽  
Peak Power ◽  
Continuous Wave ◽  
Fibre Laser ◽  
Boron Steel ◽  
Welding Parameters ◽  
Transition Line ◽  
Power Laser

The pulse wave (PW) mode is an excellent replacement for continuous wave (CW) mode f laser welding in the tailor-welded blank (TWB) application for the automotive ndustry. Due to its ability to produce higher peak power in low power laser pulse mode, he weld penetration and high weld quality can be achieved similarly to the utilization of very high power laser of CW mode. This present work was carried out to investigate the ffect of pulse laser welding parameters of a dissimilar thickness of boron steel for the TWB application. Low power fibre laser with 200 W average power was chosen in this xperimental work. Response surface method (RSM) was used for the design of xperiment (DOE) by applying Box-behnken design (BBD) since there were three rocess factors involved. The process factors are peak power (PP), welding speed (WS) nd focal position (FP) and tensile strength is the response for the weld joint. The metallurgical analysis was conducted at the cross section of sample possessing highest nd lowest tensile strength. Boron steel was successfully welded by using low power fibre aser with PW mode in butt joint configuration. It was found that the highest tensile trength possessed fracture located at the base metal, which is convincing the strength of he joint. For microstructure, finer grain produced at the centre of the fusion zone (FZ) ompared to the FZ near the transition line which produced coarser and medium grain. Finer grain size in FZ contributes to the higher microhardness value and tensile strength f the joint compared to the BM region.

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