Influence of Joint Configuration on the Strength of Laser Welded Presshardened Steel
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): H. Kügler, C. Mittelstädt, F. Vollertsen Presshardened steel is used in nowadays automotive production. Due to its high strength, sheet thicknesses can be reduced which results in decreasing weight of car body components. However, because of microstructure softening and coating agglomerations in the seam, welding is still a challenge. In this paper laser beam welding of 22MnB5 with varying energy input per irradiated area is presented. It is found that increasing energy input per seam length reduces tensile strength. Using a small spot size of 200 ...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
High Power Laser Beam Welding of Thick-walled Ferromagnetic Steels with Electromagnetic Weld Pool Support
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): André Fritzsche, Vjaceslav Avilov, Andrey Gumenyuk, Kai Hilgenberg, Michael Rethmeier The development of modern high power laser systems allows single pass welding of thick-walled components with minimal distortion. Besides the high demands on the joint preparation, the hydrostatic pressure in the melt pool increases with higher plate thicknesses. Reaching or exceeding the Laplace pressure, drop-out or melt sagging are caused. A contactless electromagnetic weld support system was used for laser beam welding of thick ferromagnetic steel plates comp...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Laser Welding of Ultrahigh Strength Steels at Subzero Temperatures
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Benjamin Gerhards, Uwe Reisgen, Simon Olschok Ultrahigh strength steels like press hardened 22MnB5 and S1100QL make good construction materials, however when fusion welded they bring the disadvantage of softening in heat affected zones (HAZ). State of the art research of Laser welding ultrahigh strength steels shows that neither increasing the welding velocity, nor post weld heat treatment have an effect on the strength and hardness drop in the HAZ. The key to improving these material characteristics is to increase heat dissipation out of the workpie...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Weld Metallurgy and Mechanical Properties of High Manganese Ultra-high Strength Steel Dissimilar Welds
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Martin Dahmen, Stefan Lindner, Damien Monfort, Dirk Petring The increasing demand for ultra-high strength steels in vehicle manufacturing leads to the application of new alloys. This poses a challenge on joining especially by fusion welding. A stainless high manganese steel sheet with excellent strength and deformation properties stands in the centre of the development. Similar and dissimilar welds with a metastable austenitic steel and a hot formed martensitic stainless steel were performed. An investigation of the mixing effects on the local micro...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Advanced Rock Drilling Technologies Using High Laser Power
This study focuses on the interaction of laser irradiation with calcite, porphyrite and siderite rock formations. A high power disc laser system at 1030nm wavelength is used to investigate the specific energy necessary to remove a unit volume depending on interaction times and applied power. Specific energies have been measured and an increase of fragility and brittleness of the rock surface has been observed. (Source: Physics Procedia)
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Laser Cutting of CFRP with a Fibre Guided High Power Nanosecond Laser Source – Influence of the Optical Fibre Diameter on Quality and Efficiency
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): S. Bluemel, S. Bastick, R. Staehr, P. Jaeschke, O. Suttmann, L. Overmeyer For the development of a robot based laser cutting process of automotive 3D parts consisting of carbon fibre reinforced plastics (CFRP), investigations with a newly developed fibre guided nanosecond pulsed laser with an average power of PL = 1.5 kW were conducted. In order to investigate the best combination of quality and process time 2 different optical fibres were used, with diameters of df = 400 μm and df = 600 μm. The main differences between the two setups are the re...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Thermal Investigation of Interaction between High-power CW-laser Radiation and a Water-jet
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Christian Brecher, Henning Janssen, Markus Eckert, Florian Schmidt The technology of a water guided laser beam has been industrially established for micro machining. Pulsed laser radiation is guided via a water jet (diameter: 25-250μm) using total internal reflection. Due to the cylindrical jet shape the depth of field increases to above 50mm, enabling parallel kerfs compared to conventional laser systems. However higher material thicknesses and macro geometries cannot be machined economically viable due to low average laser powers. Fraunhofer IPT ...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Studies on the Robustness of Underwater Laser Cutting of S355J2+N Using a Yb:YAG Disk Laser Source
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Jan Leschke, Alexander Barroi, Stefan Kaierle, Jörg Hermsdorf, Ludger Overmeyer In this paper, an underwater laser cutting process for maintenance and replacement operations is presented and investigated regarding process robustness for the application in rough environments. A Yb:YAG laser is used with 4 kW laser power in an active cutting process with oxygen as cutting gas. For 10 mm thick constructional steel plates a process window is determined with the focus on robustness for distance interferences. The examined parameter sets include the n...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Effects of Different Polarization Strategies on Laser Cutting with Direct Diode Lasers
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): G. Costa Rodrigues, J.R. Duflou As Direct Diode Lasers are introduced as an emerging technology for laser cutting of metal sheets, new challenges arise. The relatively low beam quality remains a limitation to the maximum cutting speed. One way to balance this may be a strategic use of laser polarization in order to influence laser material interaction in the cutting kerf. In this paper the effects of cross-, linear-, radial- and azimuthal- laser beam polarization arrangements are studied with both Fusion and Flame cutting at an output power of approxi...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
The Utmost Thickness of the Cut Sheet for the Qualitative Oxygen-assisted Laser Cutting of Low-carbon Steel
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): A.M. Orishich, V.B. Shulyatyev, A.A. Golyshev The peculiarity of the laser cutting is its high speed combined with the high quality of the cut surface. The issues, how the cutting speed and cut roughness change with the sheet thickness, and what is the utmost thickness at which the quality is acceptable, are of practical importance. Theoretical models of the laser cutting developed today do not permit answering these questions. In the present work, the task is solved experimentally for the oxygen-assisted laser cutting of low-carbon steel. Under stud...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Development of Scan Strategies for Controlled 3D Laser Forming of Sheet Metal Components
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): H. Gao, G. Sheikholeslami, G. Dearden, S.P. Edwardson Laser forming offers the industrial promise of controlled iterative shaping of metallic and non-metallic components. In order to fulfil this promise in a manufacturing environment the process must have a high degree of control, be repeatable and have a minimal impact on the material and mechanical properties of the part to be formed. A new approach for the development of scan strategies for controlled 3D laser forming of sheet metal components is presented in this paper based on a reverse analysi...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Optimization of Process Parameters for High Efficiency Laser Forming of Advanced High Strength Steels within Metallurgical Constraints
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Ghazal Sheikholeslami, Jonathan Griffiths, Geoff Dearden, Stuart P. Edwardson Laser forming (LF) has been shown to be a viable alternative to form automotive grade advanced high strength steels (AHSS). Due to their high strength, heat sensitivity and low conventional formability show early fractures, larger springback, batch-to-batch inconsistency and high tool wear. In this paper, optimisation of the LF process parameters has been conducted to further understand the impact of a surface heat treatment on DP1000. A FE numerical simulation has been de...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Effect of Laser Beam Alloying Strategies on the Metallurgical and Mechanical Properties of Hot Forming Tool Steels
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Konstantin Hofmann, Franziska Neubauer, Matthias Holzer, Vincent Mann, Florian Hugger, Stephan Roth, Michael Schmidt In terms of increasing lightweight designs of car body parts, the machining of high strength steels in hot stamping processes becomes of particular interest. Due to high process forces at hot stamping, the surface of such tools in the area of maximal stress is subject wear, which necessitate some local increase of microhardness to enhance the mechanical performance. Especially laser beam alloying using filler wire and beam oscillat...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Enhancing Surface Finish of Additively Manufactured Titanium and Cobalt Chrome Elements Using Laser Based Finishing
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): Wojciech S. Gora, Yingtao Tian, Aldara Pan Cabo, Marcus Ardron, Robert R.J. Maier, Philip Prangnell, Nicholas J. Weston, Duncan P. Hand Additive manufacturing (AM) offers the possibility of creating a complex free form object as a single element, which is not possible using traditional mechanical machining. Unfortunately the typically rough surface finish of additively manufactured parts is unsuitable for many applications. As a result AM parts must be post-processed; typically mechanically machined and/or and polished using either chemical or m...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
Picosecond Laser Surface Cleaning of AM1 Superalloy
Publication date: 2016 Source:Physics Procedia, Volume 83 Author(s): D. Moskal, J. Martan, M. Kučera, Š. Houdková, R. Kromer Laser scanning processing of nickel-based superalloy AM1 surfaces by ultra-short pulses (10 ps) is introduced as a cleaning and deoxidation postprocess. The laser cleaning is investigated with two-directional surface scanning by a laser beam with several frequencies of pulse generation. The EDX elemental analyses of the laser cleaned AM1 surfaces were compared with the non-laser treated surface. The optimal speed, laser pulse repetition frequency, overlapping and layer repetition count are...
Source: Physics Procedia - September 17, 2016 Category: Physics Source Type: research
