Numerical Simulation of the Thermal Cycle of the PAW-MAG Hybrid Welding of Advanced High Strength Steels

The development and implementation into a high number of industrial applications of materials categorized as (Advanced) High Strength Steels (AHSS) due to their high performance per cost ratio is more and more present and this trend is also combined with the development and implementation of new joining technologies and processes, including laser-arc hybrid processes.The paper presents the results of applying Pulsed LASER-(micro)TIG hybrid welding process, for realizing overlap joints for Zn-coated (A)HSS materials in dissimilar configurations, joints that were presented as designed based on UltraLight Steel Auto Body (ULSAB) principles.The influence of main hybrid welding process parameters was investigated in order to establish if one can obtain joints with high values for the shear strength resistance for some of the actually used dissimilar steel combinations based on designs applied throughout ULSAB project and the autos built following these principles.

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Laser hybrid welding of advanced high strength steels for potential automotive applications

International Congress on Applications of Lasers & Electro-Optics ◽

10.2351/1.5060248 ◽

2004 ◽

Cited By ~ 2

Author(s):

Craig Bratt ◽

Jack Noel

Keyword(s):

High Strength Steels ◽

High Strength ◽

Hybrid Welding ◽

Automotive Applications ◽

Advanced High Strength Steels ◽

Laser Hybrid Welding ◽

Laser Hybrid

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Hybrid welding processes in advanced high-strength steels (AHSS)

Welding and Joining of Advanced High Strength Steels (AHSS) ◽

10.1016/b978-0-85709-436-0.00007-2 ◽

2015 ◽

pp. 121-136 ◽

Cited By ~ 1

Author(s):

S. Chatterjee ◽

T. van der Veldt

Keyword(s):

High Strength Steels ◽

High Strength ◽

Hybrid Welding ◽

Advanced High Strength Steels ◽

Welding Processes

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Shear Strength Variation for PLmT Welded Zn Coated Advanced High Strength Steels Used in Automotive Structures in Overlap Configuration

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1111.205 ◽

2015 ◽

Vol 1111 ◽

pp. 205-210

Author(s):

Aurel Valentin Bîrdeanu

Keyword(s):

Shear Strength ◽

Laser Pulse ◽

Process Parameters ◽

Influence Factors ◽

Welding Process ◽

High Strength Steels ◽

High Strength ◽

Strong Interactions ◽

Hybrid Welding ◽

Advanced High Strength Steels

The paper presents the results of applying of a new hybrid welding process, i.e. Pulsed LASER-(micro)TIG (PLmT), for realizing overlap joints for Zn-coated U/AHSS thin sheets materials, used in the automotive industry for realizing car structures. The statistical influence onto the joint’s shear strength (objective function) of three hybrid welding process parameters was investigated by means of experimental design and weighted. The influence of laser pulse peak power, the average welding TIG current and the laser pulse duration was investigated for two types of Zn coated U/AHSS used in car body realization. The results revealed that the new process can be applied for the investigated materials and that joints with appropriate shear strength values can be obtained. Each combination did behave rather different in respect to the investigated process parameters and the results did reveal that rather strong interactions are in place between the influence factors (IF) for CPW 800 material. The determined models can be used to select convenient process parameters combinations in respect to minimum Zn coating damage and proper shear strength of the joints for each of the studied materials.

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Advances in Sheet Forming—Materials Modeling, Numerical Simulation, and Press Technologies

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4005117 ◽

2011 ◽

Vol 133 (6) ◽

Cited By ~ 17

Author(s):

M. G. Lee ◽

C. Kim ◽

E. J. Pavlina ◽

F. Barlat

Keyword(s):

Numerical Simulation ◽

High Strength Steels ◽

High Strength ◽

Sheet Forming ◽

Advanced High Strength Steels ◽

Forming Technology ◽

Materials Modeling ◽

Integral Element ◽

Real Importance ◽

New Methodologies

Forming modern advanced high strength steels poses challenges that were not of real importance in the previous decades. These challenges are the result of the steels’ complex microstructures and hardening behaviors, and the problems directly related to the high strength of the material, especially springback. New methodologies and processes are required to overcome these challenges and to produce formed panels via optimized forming processes. This paper reviews the key developments in the fields of numerical simulation of sheet forming processes, the material models required to obtain accurate results, and the advanced stamping presses and approaches for shaping modern steel sheet materials into desired shapes. Present research trends are summarized, which point to further developmental possibilities. Within the next decade, it is predicted that numerical simulations will become an integral part of the developmental and optimization process for stamping tools and forming processes. In addition to predicting the strains in the formed panel and its shape after trimming and springback, the simulation technology will also determine the optimum displacement path of the forming tool elements to realize minimum springback. Toward those goals, digital servo presses are expected to become an integral element of the overall forming technology.

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Laser Hybrid Welding of Advanced High Strength Steels (AHSS) for Automotive Body Construction

Volume 3: Design and Manufacturing ◽

10.1115/imece2007-43415 ◽

2007 ◽

Author(s):

Ramakrishna Koganti ◽

Sergio Angotti ◽

Armando Joaquin ◽

Eric Stiles

Keyword(s):

Mild Steel ◽

Light Source ◽

Welding Process ◽

High Strength Steels ◽

High Strength ◽

Hybrid Welding ◽

Advanced High Strength Steels ◽

Laser Hybrid Welding ◽

Laser Hybrid ◽

Welding Processes

In response to demands for improved safety standards and fuel economy, automotive OEMs have shown an increased interest for using light weight materials with greater strength. Advanced High Strength Steels (AHSS) have gained popularity due to their superior mechanical properties and weight advantages, as compared to mild steel materials. Welding of AHSS materials remains one of the technical challenges in the successful application of AHSS in automobile structures, especially when durability of the welded structures is required. Currently, various fusion welding processes such as Metal Inert Gas (MIG), Laser and Laser Hybrid are used on mild steel applications. The Laser and Laser Hybrid weld processes continue to gain popularity in automotive applications due to their ability to provide structural integrity and manufacturing efficiency. In laser welding, only a light source is used to join materials together. In laser hybrid, both a light source and metal filler are used to join the materials. In this paper, the laser hybrid joining process on AHSS materials (DP780 and Boron) is investigated. Influence of heat from Laser Hybrid welding process and its effect on the steel is discussed.

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