The Experts below are selected from a list of 2592 Experts worldwide ranked by ideXlab platform

Rainer Wagener - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical Properties of Laser Beam Welded Ultra-high Strength Chromium Steel with Martensitic Microstructure
    Physics Procedia, 2015
    Co-Authors: Michael Dahmen, Vitalij Janzen, Stefan Lindner, Rainer Wagener
    Abstract:

    Abstract A new class of steels is going to be introduced into Sheet manufacturing. Stainless ferritic and martensitic steels open up opportunities for Sheet Metal Fabrication including hot stamping. A strength of up to 2 GPa at a fracture strain of 15% can be attained. Welding of these materials became apparently a challenge. Energy-reduced welding methods with in-situ heat treatment are required in order to ensure the delicate and complex heat control. Laser beam welding is the joining technique of choice to supply minimum heat input to the fusion process and to apply an efficient heat control. For two application cases, production of tailored blanks in as-rolled condition and welding in assembly in hot stamped conditions, welding processes have been developed. The welding suitability is shown in Metallurgical investigations of the welds. Crash tests based on the KSII concept as well as fatigue tests prove the applicability of the joining method. For the case of assembly also joining with deep drawing and manganese boron steel was taken into consideration. The strength of the joint is determined by the weaker partner but can benefit from its ductility.

  • Laser beam welding of ultra-high strength chromium steel with martensitic microstructure
    Physics Procedia, 2014
    Co-Authors: Michael Dahmen, Vitalij Janzen, Stefan Lindner, Rainer Wagener
    Abstract:

    A new class of steels is going to be introduced into Sheet manufacturing. Stainless ferritic and martensitic steels open up opportunities for Sheet Metal Fabrication including hot stamping. Strengths of up to 2 GPa at fracture elongations of 15% can be attained through this. Welding of these materials, as a result, became a challenge. Energy-reduced welding methods with in-situ heat treatment are required in order to ensure the delicate and complex heat control. Laser beam welding is the joining technique of choice to supply minimum heat input to the fusion process and to apply efficient heat control. For two application cases, tailored blank production in as-rolled condition and welding during assembly in hot stamped condition, welding processes have been developed. The welding suitability is shown through Metallurgical investigations of the welds. Crash tests based on the KS-II concept as well as fatigue tests prove the applicability of the joining method.

Wojciech Wyczalkowski - One of the best experts on this subject based on the ideXlab platform.

  • Advanced impeller design: Anti-ragging impeller, ARI2
    Chemical Engineering Research and Design, 2013
    Co-Authors: Robert W. Higbee, Jason J. Giacomelli, Wojciech Wyczalkowski
    Abstract:

    Abstract The waste water treatment plant anoxic denitrification process employs agitated vessels which contain process fluids contaminated with fibrous, rag-like materials that have a tendency to collect on impeller blades and adversely affect mixing performance. The existing Philadelphia Mixing Solutions Ltd. anti-ragging impeller made from fiberglass reinforced plastic is not cost effective for this low torque application. The challenge was to design an impeller that replicated the performance of the original impeller but utilized common industrial manufacturing processes to reduce cost. The flexible construction technology chosen was Sheet Metal Fabrication. The design effort produced a highly skewed, forward raked, hydrofoil impeller with applications that extend beyond the waste water treatment industry. The performance of the new impeller was evaluated by comparing it to the fiberglass impeller as well as three other common impeller types used in stirred tanks. Impeller pumping capacity was measured using 2-D Particle Image Velocimetry and impeller power draw was measured using a load cell and tachometer. The characteristic dimensionless impeller power and flow number, Np and Nq , were computed to be 0.17 and 0.42, respectively.

Michael Dahmen - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical Properties of Laser Beam Welded Ultra-high Strength Chromium Steel with Martensitic Microstructure
    Physics Procedia, 2015
    Co-Authors: Michael Dahmen, Vitalij Janzen, Stefan Lindner, Rainer Wagener
    Abstract:

    Abstract A new class of steels is going to be introduced into Sheet manufacturing. Stainless ferritic and martensitic steels open up opportunities for Sheet Metal Fabrication including hot stamping. A strength of up to 2 GPa at a fracture strain of 15% can be attained. Welding of these materials became apparently a challenge. Energy-reduced welding methods with in-situ heat treatment are required in order to ensure the delicate and complex heat control. Laser beam welding is the joining technique of choice to supply minimum heat input to the fusion process and to apply an efficient heat control. For two application cases, production of tailored blanks in as-rolled condition and welding in assembly in hot stamped conditions, welding processes have been developed. The welding suitability is shown in Metallurgical investigations of the welds. Crash tests based on the KSII concept as well as fatigue tests prove the applicability of the joining method. For the case of assembly also joining with deep drawing and manganese boron steel was taken into consideration. The strength of the joint is determined by the weaker partner but can benefit from its ductility.

  • Laser beam welding of ultra-high strength chromium steel with martensitic microstructure
    Physics Procedia, 2014
    Co-Authors: Michael Dahmen, Vitalij Janzen, Stefan Lindner, Rainer Wagener
    Abstract:

    A new class of steels is going to be introduced into Sheet manufacturing. Stainless ferritic and martensitic steels open up opportunities for Sheet Metal Fabrication including hot stamping. Strengths of up to 2 GPa at fracture elongations of 15% can be attained through this. Welding of these materials, as a result, became a challenge. Energy-reduced welding methods with in-situ heat treatment are required in order to ensure the delicate and complex heat control. Laser beam welding is the joining technique of choice to supply minimum heat input to the fusion process and to apply efficient heat control. For two application cases, tailored blank production in as-rolled condition and welding during assembly in hot stamped condition, welding processes have been developed. The welding suitability is shown through Metallurgical investigations of the welds. Crash tests based on the KS-II concept as well as fatigue tests prove the applicability of the joining method.

R Sharma - One of the best experts on this subject based on the ideXlab platform.

  • a feature model editor and process planning system for Sheet Metal products
    Journal of Materials Processing Technology, 2000
    Co-Authors: Y.s. Tang, R Sharma
    Abstract:

    Abstract Sheet Metal is widely used for industrial and consumer products because of its malleability into complex shapes. However, in the aerospace industry manufacturing planning of Sheet Metal products is still mainly carried out manually. Most of the previous research in this field has been primarily devoted to computer aided process planning for rotational and prismatic parts. This paper describes the development of an advanced software toolset used for the automation of Sheet Metal Fabrication planning for aircraft components. The system is specifically designed to be implemented and maintained by manufacturing engineers, rather than computer programmers. Therefore a systematic user requirement capture has been carried out, and the planning knowledge has been captured within a leading aerospace company, which was the main sponsor of the project. The prototype system was then developed in collaboration with a software consultant company and finally evaluated and benchmarked through industrial case studies which proved that the system provides an efficient and effective approach to Sheet Metal Fabrication process planning, when compared with other commercially available systems.

K Prasad - One of the best experts on this subject based on the ideXlab platform.

  • Microstructures and Mechanical Properties of Friction Stir Spot Welded Aluminum Alloy AA2014
    Journal of Materials Engineering and Performance, 2013
    Co-Authors: S. Babu, V. S. Sankar, G. D. Janaki Ram, G. Madhusudhan Reddy, P. V. Venkitakrishnan, K Prasad
    Abstract:

    Friction stir spot welding (FSSW) is a relatively recent development, which can provide a superior alternative to resistance spot welding and riveting for Fabrication of aluminum Sheet Metal structures. In the current work, FSSW experiments were conducted in 3-mm thick Sheets of aluminum alloy 2014 in T4 and T6 conditions, with and without Alclad layers. The effects of tool geometry and welding process parameters on joint formation were investigated. A good correlation between process parameters, bond width, hook height, joint strength, and fracture mode was observed. The presence of Alclad layers and the base Metal temper condition were found to have no major effect on joint formation and joint strength. Friction stir spot welds produced under optimum conditions were found to be superior to riveted joints in lap-shear and cross-tension tests. The prospects of FSSW in aluminum Sheet Metal Fabrication are discussed.