Developing laser beam welding parameters for the assembly of steel SLM parts for the automotive industry

2018 ◽  
Vol 24 (8) ◽  
pp. 1288-1295 ◽  
Author(s):  
Thiemo Valentin Fieger ◽  
Maximilian Ferdinand Sattler ◽  
Gerd Witt
Keyword(s):  
Laser Beam ◽  
Automotive Industry ◽  
Laser Beam Welding ◽  
Welding Parameters ◽  
Content Type ◽  
Steel Sheets ◽  
Novel Approach ◽  
Metal Sheets ◽  
Cold Rolled ◽  
Parameter Ranges

Purpose This paper aims to identify issues with joining selective laser melting (SLM) steels with conventional cold rolled steels through remote laser beam welding. Design/methodology/approach A novel approach for substituting conventional cold rolled metal sheets with SLM metal sheets, made of 316L and 18-Ni 300, is presented. The characteristics of the interaction of wrought and SLM materials are described, and joining benchmark parameters are presented and compared to known existing joining results. Finally, the joints are assessed in line with automotive specifications. This research also addresses the importance of joining technologies for the implementation of SLM as a full-fledged manufacturing technology for the automotive industry. Findings New parameter ranges for laser beam welding of SLM steels are defined. Research limitations/implications This research is limited to the examined steels and the used machines, parameters and equipment. Practical implications The presented benchmark parameters are expected to be useful for designers, product developers and machine operators. Originality/value Little knowledge is available about the behavior of SLM materials and their suitability for assembly processes. Novel information about SLM steels and their interaction with conventionally produced steel sheets is presented.

scholarly journals Laser Weldability of Different Al-Zn Alloys and its Improvement

2015 ◽  
Vol 828-829 ◽  
pp. 389-394 ◽  
Author(s):  
Josephin Enz ◽  
Stefan Riekehr ◽  
Volker Ventzke ◽  
Nikolai Kashaev
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
High Strength ◽  
Hot Cracking ◽  
Welding Parameters ◽  
The Novel ◽  
New Approach ◽  
Application Range ◽  
Novel Approach ◽  
Zn Alloys

Weld defects - such as porosity and hot cracking - occur especially during the laser beam welding of high-alloyed Al-Zn alloys. This significantly limits the application range of these promising high-strength alloys. In the present study the laser weldability of different Al-Zn alloys was investigated regarding the used welding parameters and the chemical composition of the alloys. In addition, the novel approach of the Helmholtz-Zentrum Geesthacht for overcoming the weldability problems was applied to the different Al-Zn alloys in order to assess its capability. It was shown that the laser weldability of Al-Zn alloys deteriorates with an increasing amount of Zn, Mg and Cu. The variation of laser beam welding parameters did not lead to any improvement of weldability. Only the use of the new approach resulted in promising welding results even for the high-alloyed Al-Zn alloys.

scholarly journals Comparison of Hot Cracking Susceptibility of TIG and Laser Beam Welded Alloy 718 by Varestraint Testing

Metals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 985 ◽  
Author(s):  
Pedro Alvarez ◽  
Lexuri Vázquez ◽  
Noelia Ruiz ◽  
Pedro Rodríguez ◽  
Ana Magaña ◽  
...  
Keyword(s):  
Grain Size ◽  
Laser Beam ◽  
Laser Beam Welding ◽  
Hot Cracking ◽  
Welding Parameters ◽  
Minor Effect ◽  
Alloy 718 ◽  
Material Source ◽  
Cross Sectional ◽  
Varestraint Test

Reduced hot cracking susceptibility is essential to ensure the flawless manufacturing of nickel superalloys typically employed in welded aircraft engine structures. The hot cracking of precipitation strengthened alloy 718 mainly depends on chemical composition and microstructure resulting from the thermal story. Alloy 718 is usually welded in a solution annealed state. However, even with this thermal treatment, cracks can be induced during standard industrial manufacturing conditions, leading to costly and time-consuming reworking. In this work, the cracking susceptibility of wrought and investment casting alloy 718 is studied by the Varestraint test. The test is performed while applying different welding conditions, i.e., continuous tungsten inert gas (TIG), low frequency pulsed TIG, continuous laser beam welding (LBW) and pulsed LBW. Welding parameters are selected for each welding technology in order to meet the welding quality criteria requested for targeted aeronautical applications, that is, full penetration, minimum cross-sectional welding width and reduced overhang and underfill. Results show that the hot cracking susceptibility of LBW samples determined by the Varestraint test is enhanced due to extended center line hot cracking, resulting in a fish-bone like cracking pattern. On the contrary, the minor effect of material source (wrought or casting), grain size and pulsation is observed. In fact, casting samples with a 30 times coarser grain size have shown better performance than wrought material.

Joining of Aluminium Structures with Aluminium Foams

1998 ◽  
Vol 521 ◽  
Author(s):  
J. Burzer ◽  
T. Bernard ◽  
H. W. Bergmann
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Tensile Test ◽  
Laser Beam Welding ◽  
Welding Parameters ◽  
Transportation Industry ◽  
Absorption Properties ◽  
Testing Method ◽  
New Construction ◽  
Joining Process

ABSTRACTThe aim of this work is the evaluation of new construction elements for applications in transportation industry which are based on new designs incorporating commonly applied aluminium structures and aluminium foams. The work includes the characterisation of the joining process, the joining mechanism and the mechanical properties of the joining zone. A testing method for the joints is developed which is based on a common tensile test in order to evaluate the influence of the main laser welding parameters on the toughness of the joints and to afford a comparison between laser beam welding and gluing process. The analysis of the joining mechanism is investigated with the help of metallographic studies. In addition, the energy absorption properties of aluminium hollows filled and joined with foam structures are characterised.

An Experimental Study on Bending Process of AISI 304 Steel Sheets by using Diode Laser Forming

2014 ◽  
Vol 1 (1) ◽  
pp. 14-30
Author(s):  
Alfonso Paoletti
Keyword(s):  
Laser Beam ◽  
Diode Laser ◽  
Process Parameters ◽  
Laser Forming ◽  
Laser Bending ◽  
Aisi 304 ◽  
Steel Sheets ◽  
Metal Sheets ◽  
Bending Process ◽  
Aisi 304 Steel

Laser bending is a promising technique utilised in order to deform metal sheets that offers the advantage of requiring no hard tooling and no external forces, thus reducing cost and increasing flexibility. Laser forming involves a complex interaction of many process parameters, ranging from those connected with the irradiation of the laser beam to those regarding the thermal and mechanical properties of the workpiece material. The present work is focused on the laser bending of AISI 304 steel sheets by using of a diode laser. The influence of process parameters, such as the power of laser beam and the scanning speed as well as the metal sheet thickness on the bending angle has been taken into account. The investigation has also analysed the effect of rolling direction of the metal sheets and the conditions of cooling on the bending process.

Facilitated Recrystalization of the Hard-to-Recrystalize Structure in 16% Cr Steel Sheets by one-Pass ECAP Prior to Cold Rolling

2011 ◽  
Vol 702-703 ◽  
pp. 607-610
Author(s):  
Hiroyuki Miyamoto ◽  
Tong Xiao ◽  
Toshiyuki Uenoya
Keyword(s):  
Cold Rolling ◽  
Strain Path ◽  
Equivalent Strain ◽  
Recrystallization Temperature ◽  
Deformation Bands ◽  
Final Annealing ◽  
Steel Sheets ◽  
Novel Approach ◽  
Cold Rolled ◽  
Strain Path Change

The extended band structures of cold-rolled high Cr steel sheets are recrystallization resistant, and tend to become the so-called grain colony as a recovered state. It is shown that a novel approach involving strain-path change by introducing one-pass ECAP prior to cold rolling facilitated recrystallization. Indeed, recrystallization temperature was reduced by 100 °C, compared with cold rolling alone imposing the same equivalent strain. Dense deformation bands introduced during ECAP perturbed the banded structures and enhanced the recrystallization at final annealing.

The Effect of Laser Beam Welding Parameters onto the Evolving Joints Geometry

2017 ◽  
Vol 885 ◽  
pp. 178-183 ◽  
Author(s):  
Miklós Berczeli ◽  
Gábor Buza
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Feed Rate ◽  
Laser Beam Welding ◽  
Spot Size ◽  
Welding Parameters ◽  
Beam Focusing ◽  
Metallographic Cross Section ◽  
New Type ◽  
Beam Parameters

In our research the effect of a new type of laser beam parameters during the laser welding have been investigated with 80 different welding parameters. The laser welding parameters such as the laser power, laser beam spot size on the surface and feed rate greatly affect the resulting weld geometry. S235 grade steel has been used. The operating equipment was a Trumpf 4001 4 kW disk laser with a diameter of 100 microns optical fiber. The effect of different welding parameters were evaluated from the metallographic cross-section of the welded joints. This article describes the effect of the different laser beam focusing and the welding feed rate.

scholarly journals Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

2019 ◽  
Vol 19 (1) ◽  
pp. 21-31 ◽  
Author(s):  
M. Landowski
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Laser Welding ◽  
Duplex Stainless Steel ◽  
Welded Joints ◽  
Laser Beam Welding ◽  
Welding Parameters ◽  
Processing Technologies ◽  
High Level ◽  
The Impact

AbstractLaser welding is used in modern industry, having many advantages comparing to traditional welding technologies. Nowadays, industry sectors such as shipbuilding, automotive and aviation can’t be imagined without laser processing technologies. Possibility of increase of welded joint properties, autogenous welding and high level of process automation makes the technology of laser welding perspective part of the industry. Physical multidimensional processes complexity requires a deeper understanding of the impact of laser welding parameters on the quality of welded joints for industrial implementation. The paper presents results of microstructure investigations of laser beam welded stainless steel under various welding parameters. Welded joints was achieved by Ytterbium fiber laser type without the use of the filler material. Material for test was 2205 ferritic-austenitic duplex stainless steel (DSS) plates with thickness of 8 mm in delivery condition. The objectives of this research was to investigate influence of laser welding parameters on weld geometry of butt-welded joints. Investigations of bead shape revealed correlation between laser beam focus position and weld penetration depth.

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