Parameters of Laser Welding and their Influence of Weld Seam

2015 ◽  
Vol 818 ◽  
pp. 260-263
Author(s):  
Peter Balog ◽  
Janette Brezinová ◽  
Peter Pastorek
Keyword(s):  
Laser Welding ◽  
Automotive Industry ◽  
New Technologies ◽  
Beam Quality ◽  
Laser System ◽  
Base Material ◽  
Lap Joints ◽  
Welding Parameters ◽  
Beam Diameter ◽  
Butt Welding

Lap joints are most used joints in automotive industry. These types of welds are usually created by spot welding, but new technologies who came to automotive industry considerably do weld process faster. Paper deals with laser welding parameters and their influence of weld seams. The parameters of welding are readjusting according to shape of weld, impurities of surface and gap. Steel S500MC with thickness of 1.0 and 2.2 mm was used as the base material. For welding was used fiber laser Ytterbium Laser System YLS with power of 6000 watt from IPG Company. Research was oriented on changing weld parameters and their influence of welds quality. It was found that butt welding joints are sensitive to gap and the gap tolerances which in turn is dependent on material thickness, beam diameter, welding speed and beam quality.

scholarly journals Disk Laser Welding of Armor Steel/ Spawanie Laserem Dyskowym Stali Pancernej

2014 ◽  
Vol 59 (4) ◽  
pp. 1641-1646 ◽  
Author(s):  
D. Janicki
Keyword(s):  
Laser Welding ◽  
Focal Point ◽  
Base Material ◽  
Steel Plates ◽  
Welding Parameters ◽  
Maximum Output ◽  
Butt Welding ◽  
Disk Laser ◽  
Armor Steel ◽  
Charpy Absorbed Energy

Abstract The paper describes the application of an Yb:YAG disk laser with a maximum output of 3.3 kW for the butt welding of armor steel plates ARMOX 500T 3.6 mm thick. The influence of laser welding parameters such as laser power beam, welding speed, focal point position on weld quality and mechanical properties of joints was studied. A proper selection of disk laser welding parameters provides non-porous and cracks free fully-penetrated welds with the aspect ratio up to 6.4. There was approx. 40% reduction in the hardness of heat affected zone (HAZ) in comparison to hardness of the base material (BM). The hardness values at the weld metal and the BM were similar. The joints exhibited about 15% lower ultimate tensile strength when compared with that of the BM. Charpy absorbed energy of the joints was approx. 30% lower than that of the BM.

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.

Investigation and Optimization of Laser Welding of Ti-6Al-4 V Titanium Alloy Plates

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Fabrizia Caiazzo ◽  
Vittorio Alfieri ◽  
Gaetano Corrado ◽  
Francesco Cardaropoli ◽  
Vincenzo Sergi
Keyword(s):  
Laser Welding ◽  
Titanium Alloys ◽  
Beam Quality ◽  
Tensile Tests ◽  
Laser Source ◽  
Face Centered Cubic ◽  
Butt Welding ◽  
Specific Strength ◽  
Wide Range ◽  
Predicted Values

Titanium alloys are employed in a wide range of applications, from aerospace to medicine. In particular, Ti-6Al-4 V is the most common, thanks to an excellent combination of low density, high specific strength, and corrosion resistance. Laser welding has been increasingly considered as an alternative to traditional techniques to join titanium alloys. An increase in penetration depth and a reduction of possible welding defects are indeed achieved; moreover, a smaller grain size in the fused zone (FZ) is benefited in comparison to either tungsten inert gas (TIG) or plasma arc welding, thus improving the tensile strength of the welded structures. This study was carried out on 3 mm thick Ti-6Al-4 V plates in square butt welding configuration. The novelty element of the investigation is the use of a disk-laser source, which allows a number of benefits thanks to better beam quality; furthermore, a proper device was developed for bead protection, as titanium is prone to oxidation when in fused state. A three-level factorial plan was arranged in face-centered cubic scheme. The regression models were found for a number of crucial responses and the corresponding surfaces were discussed; then a numerical optimization was carried out. The suggested condition was evaluated to compare the actual responses to the predicted values; X-ray inspections, Vickers micro hardness tests, and tensile tests were performed for the optimum.

Microstructures and Mechanical Properties of Al-12.7Si-0.7Mg Alloy Welded Joints

2013 ◽  
Vol 712-715 ◽  
pp. 623-626
Author(s):  
Dong Wang ◽  
Chang Shu He ◽  
Zhen Yu Qi ◽  
Hao Wang ◽  
Xiang Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Gas Metal Arc Welding ◽  
Base Material ◽  
Hot Extrusion ◽  
Test Methods ◽  
Internal Quality ◽  
Welding Parameters ◽  
Butt Welding ◽  
Microstructures And Mechanical Properties

3-mm thick Al-12.7Si-0.7Mg alloy plates were cut from the hot extrusion profiles. A butt-welding joint was made by gas metal arc welding (GMAW). The microstructures and mechanical properties of welded joint were studied by scanning electron microscope and tensile test methods. The results show that weld bead with good appearance and internal quality was obtained under the optimized welding parameters. The ultimate tensile strength for base material and welded joints of hot extrusion Al-12.7Si-0.7Mg alloy are much higher than that of 6063 alloy in T4 condition.

scholarly journals Hundred-Joule-level, nanosecond-pulse Nd:glass laser system with high spatiotemporal beam quality

2016 ◽  
Vol 4 ◽  
Author(s):  
Sensen Li ◽  
Yulei Wang ◽  
Zhiwei Lu ◽  
Lei Ding ◽  
Yi Chen ◽  
...  
Keyword(s):  
Pulse Width ◽  
Frequency Conversion ◽  
Beam Quality ◽  
Laser System ◽  
Energy Output ◽  
Level Energy ◽  
Beam Diameter ◽  
System Operating ◽  
Nd:Glass Laser

A 100-J-level Nd:glass laser system in nanosecond-scale pulse width has been constructed to perform as a standard source of high-fluence-laser science experiments. The laser system, operating with typical pulse durations of 3–5 ns and beam diameter 60 mm, employs a sequence of successive rod amplifiers to achieve 100-J-level energy at 1053 nm at 3 ns. The frequency conversion can provide energy of 50-J level at 351 nm. In addition to the high stability of the energy output, the most valuable of the laser system is the high spatiotemporal beam quality of the output, which contains the uniform square pulse waveform, the uniform flat-top spatial fluence distribution and the uniform flat-top wavefront.

Microstructure and Mechanical Properties of Laser Welding Joint of Inconel 718 Super Thin Sheet

2011 ◽  
Vol 391-392 ◽  
pp. 479-483 ◽  
Author(s):  
Shu Guo Zhang ◽  
Yu Hua Chen ◽  
Jun Hua Cui
Keyword(s):  
Laser Welding ◽  
Inconel 718 ◽  
Gas Flow ◽  
Focal Point ◽  
Thin Sheet ◽  
Weld Zone ◽  
Base Material ◽  
Welding Parameters ◽  
Yag Laser ◽  
Welding Joint

Nd-YAG laser welding characteristics of Inconel 718, microstructures,tensile properties,and hardness of welding joint were researched. Nd-YAG laser welding was carried out on super thin Inconel 718 sheet(0.2 mm thick) with 6 specimens. The welding parameters of these specimens are varied expect for the welding speed(0.3mm/s), gas-flow rate (5L/min) and clearance between focal point and (plate) surface(0).In this research,the tensile strength of welding joint was found to be inferior to base metal and the ductility of welds was considerably lower than base material,the microhardness in weld zone is higher than the base material hardness and the hardness is highest in center zone of welding joint. These conclusions will be in favour of the manufacture with super thin Inconel 718.

Effect of welding on the fatigue strength of welded joints using the GMAW process in transformation induced plasticity steels (TRIP) used in the automotive industry

2012 ◽  
Vol 1381 ◽  
Author(s):  
Victor Lopez ◽  
Arturo Reyes ◽  
Patricia Zambrano ◽  
Joaquín Del Prado
Keyword(s):  
Automotive Industry ◽  
Trip Steel ◽  
Fatigue Testing ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Fatigue Tests ◽  
Lap Joints ◽  
Welding Parameters ◽  
Trip Steels ◽  
Metal Arc Welding

ABSTRACTWelding of TRIP steels are one of the technical challenges in the successful application of AHSS in chassis structures. Gas Metal Arc Welding (GMAW) is a common welding process used in the automotive industry, for joining mild steels. TRIP steel; however, do not offer the same ease of welding, and process control welding parameters is more critical. The welding parameters window represents the range of acceptable process parameters, primarily control of heat inputs, to obtain an acceptable weld. As a result, the effects of the heat input variations are greater and TRIP steel has a narrower welding parameters window in which acceptable welds can be made. Mechanical properties of the lap joints of TRIP 780 steel 2.8 mm thickness was analyzed, fusion welds were evaluated using fatigue tests on these joints for different heat inputs. Fatigue testing was conducted under a different number of nominal stress ranges to obtain the S/N curves of the weld joints.

scholarly journals Characterization of Absorption Losses and Transient Thermo-Optic Effects in a High-Power Laser System

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 94
Author(s):  
Lukasz Gorajek ◽  
Przemyslaw Gontar ◽  
Jan Jabczynski ◽  
Jozef Firak ◽  
Marek Stefaniak ◽  
...  
Keyword(s):  
High Power ◽  
Continuous Wave ◽  
Beam Quality ◽  
Laser System ◽  
Infrared Camera ◽  
High Energy ◽  
Laser Source ◽  
Transient Temperature ◽  
Temperature Profiles ◽  
Beam Diameter

(1) Background: The modeling, characterization, and mitigation of transient lasers, thermal stress, and thermo-optic effects (TOEs) occurring inside high energy lasers have become hot research topics in laser physics over the past few decades. The physical sources of TOEs are the un-avoidable residual absorption and scattering in the volume and on the surface of passive and active laser elements. Therefore, it is necessary to characterize and mitigate these effects in real laser systems under high-power operations. (2) Methods: The laboratory setup comprised a 10-kW continuous wave laser source with a changeable beam diameter, and dynamic registration of the transient temperature profiles was applied using an infrared camera. Modeling using COMSOL Multiphysics enabled matching of the surface and volume absorption coefficients to the experimental data of the temperature profiles. The beam quality was estimated from the known optical path differences (OPDs) occurring within the examined sample. (3) Results: The absorption loss coefficients of dielectric coatings were determined for the evaluation of several coating technologies. Additionally, OPDs for typical transmissive and reflective elements were determined. (4) Conclusions: The idea of dynamic self-compensation of transient TOEs using a tailored design of the considered transmissive and reflecting elements is proposed.

Welding of Automotive Aluminum Alloys by Laser Wobbling Processing

2016 ◽  
Vol 879 ◽  
pp. 1057-1062 ◽  
Author(s):  
Giuseppe Barbieri ◽  
Francesco Cognini ◽  
Massimo Moncada ◽  
Antonio Rinaldi ◽  
Gabriele Lapi
Keyword(s):  
Thin Sheet ◽  
Base Material ◽  
Welding Process ◽  
Lap Joints ◽  
Welding Parameters ◽  
Destructive Testing ◽  
Butt Joints ◽  
Tailored Blanks ◽  
Rupture Mode ◽  
Non Destructive

The scope of this paper is to examine the improvement from laser welding by an innovative beam wobbling head towards the welding of tailored blanks parts, widely used in automotive to develop different stiffness aluminum components. For this purpose, butt joints and overlapping joints were produced from sheets made out of two industrial grades, i.e. AA-6082 T6 and AA-5754 H111 of different thickness. The technique was evaluated both with and without the use of a filler wire (AA-5556). The qualification of the welding process encompassed Non Destructive Testing (NDT) and mechanical testing. The results indicate that butt joints tend to fail within the base material (BM) of sheet with smaller thickness. On the contrary, the shear tests on lap joints highlighted a rupture mode occurring in the heat affected zone (HAZ) of the thin sheet. Remarkably, the wobbling process generally allows avoiding porosity when combined with an optimized set of welding parameters. Yet, a residual porosity was always detected in lap joints, varying with the size of the fused zone.

Effects of Laser Welding Conditions on Toughness of Dissimilar Welded Components

2006 ◽  
Vol 5-6 ◽  
pp. 375-380 ◽  
Author(s):  
E.M. Anawa ◽  
Abdul Ghani Olabi
Keyword(s):  
Impact Strength ◽  
Laser Welding ◽  
Low Carbon Steel ◽  
Base Material ◽  
Welding Process ◽  
Dissimilar Materials ◽  
Welding Parameters ◽  
Taguchi Approach ◽  
Low Carbon ◽  
The Impact

Welding dissimilar materials become inevitable in engineering industries. There are many issues/problems associated with the welding of dissimilar materials, related to the welding process and its parameters. The current work investigates the effect of laser welding conditions on the toughness of dissimilar welded components. In this study, CO2 laser welding has been successfully applied for joining 316 stainless steel with low carbon steel (F/A). Design of experiment techniques has been used for different effective welding parameters (laser power, welding speed, and focus position) to optimize the dissimilar F/A joints in terms of its mechanical properties. Taguchi approach was applied to optimize the welding parameters. Three factors with five levels each (L-25) were employed in these models. Impact strength was measured at room temperature by using the universal pendulum impact tester. The results were compared with the impact strength of the base material. The results were analysed using ANOVA and S/N ratio for optimal parameters combination. It is evident that Taguchi approach has decreased the number of experiments without negative effects on the result.

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