Investigation on dissimilar laser welding of advanced high strength steel sheets for the automotive industry

Rossini, Matteo; Spena, Pasquale Russo; Cortese, Luca; Matteis, Paolo; Firrao, Donato

doi:10.1016/j.msea.2015.01.037

Cited by 121 publications

(46 citation statements)

References 25 publications

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“…The need to reduce fuel consumption and greenhouse gas emissions motivates vehicle manufacturers to utilize lightweight metals with better ductility and strength [1,2]. Nowadays, dual-phase (DP) have already built a good reputation for performance and safety [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Xue

Péreira

Amorim

et al. 2017

Metals

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Abstract:Of particular importance and interest are the effects of pulsed Nd:YAG laser beam welding parameters on penetration and microstructure characterization of DP1000 butt joint, which is widely used in the automotive industry nowadays. Some key experimental technologies including pre-welding sample preparation and optimization design of sample fixture for a sufficient shielding gas flow are performed to ensure consistent and stable testing. The weld quality can be influenced by several process factors, such as laser beam power, pulse duration, overlap, spot diameter, pulse type, and welding velocity. The results indicate that these key process parameters have a significant effect on the weld penetration. Meanwhile, the fusion zone of butt joints exhibits obviously greater hardness than the base metal and heat affected zone of butt joints. Additionally, the volume fraction of martensite of dual-phase steel plays a considerable effect on the hardness and the change of microstructure characterization of the weld joint.

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Section: Introductionmentioning

confidence: 99%

Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Xue

Péreira

Amorim

et al. 2017

Metals

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“…The process is flexible one and allows for different combinations of relative volume ratio of ferrite and martensite. The dual phase steels are used in automotive industry for frames and crossbeams, vertical beams, side impact beams, and safety elements [4][5][6]. Dual phase steels have been used for producing of tailor welded blanks.…”

Section: Introductionmentioning

confidence: 99%

Fibre Laser Welding of Dual Phase Steels

Švec¹,

Schrek²,

Hrnčiar³

et al. 2015

Acta Metall Slovaca

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The fibre laser welding of two different dual phase steels HCT980X and HCT600X was evaluated. The sheets with thickness of 1.2 mm were welded using the solid-state fibre laser IPG type YLR 4500 with maximum output 4.5 kW and wave length 1060 nm at graduated beam powers and welding speeds. The microstructure of welded samples was analysed, microhardness and tensile strength were measured. The heat input influenced the microstructure of the fusion zone and heat affected zone. The microhardness increased in the fusion zone and even more in the heat affected zone of HCT980X steel, which was the consequence of martensite and bainite formation in these areas. The tensile strength of joints achieved the strength of the HCT600X steel and all joints fractured in the HCT600X base metal.Keywords: dual phase steels, fibre laser welding, microstructure, microhardness, tensile strength IntroductionDual phase (DP) steels, which are the important part of advanced high strength steels, have been used in manufacture of lightweight automobiles to reduce fuel consumption without compromising other attributes such as safety, performance, recyclability and cost. Some of the major advantages of the dual phase steels include their superior mechanical properties in comparison with standard steels, moderate price thanks to small amount of alloying additions, as well as excellent technological properties, together with good weldability and machinability [1][2][3][4]. The excellent mechanical properties are the consequence of their multiphase structure. Microstructure of DP steel consists of 30-70 % martensite in the fine-grained, spherical ferrite matrix and 1-10 % of metastable retained austenite. As a result, the steel is characterised by high tensile strength up to 1180 MPa with unit elongation up to 27 %. Most often the microstructure of DP steel is developed as a result of accelerated cooling of thin sheets after cold rolling in the range between Ac1 and Ac3 and controlled air-water mist cooling to ambient temperature. The process is flexible one and allows for different combinations of relative volume ratio of ferrite and martensite. The dual phase steels are used in automotive industry for frames and crossbeams, vertical beams, side impact beams, and safety elements [4][5][6]. Dual phase steels have been used for producing of tailor welded blanks. Tailor welded blanks are semi-finished parts that consist of at least two single sheets that are welded together prior the forming process. The sheets can exhibit different mechanical properties, thickness or coatings.

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“…Casalino et al [10] found that a fiber laser was used to perform a dissimilar metal joining between AZ31B Mg and 316 stainless steel with the ultimate tensile strength exceeding 100 MPa. Rossini et al [11] conducted experiments with dissimilar joints between the DP, hotstampingboron (22MnB5) steels, and TRansformation Induced Plasticity (TRIP) steels with exhibiting good resistance properties. However, due to the very large differences in the physical properties of Mg and steel, and poor interactions, conventional processes have exhibited some disadvantages, such as a large heat-affected zone (HAZ), solidification cracking, porosity, evaporative loss of the alloying elements, and high residual stresses resulting in low welding joint strength [12,13].…”

Section: Introductionmentioning

confidence: 99%

The Role of Mechanical Connection during Friction Stir Keyholeless Spot Welding Joints of Dissimilar Materials

Liu

Wang

et al. 2017

Metals

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Abstract:Contrast experiments of lap joints among dissimilar AZ31B Mg alloy, Mg99.50, zinc-coated DP600 sheet, and non-zinc-coated DP600 sheet were made by friction stir keyholeless spot welding (FSKSW) and vacuum diffusion welding (VDW), respectively. Scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS) were used to investigate the microstructures and components of the joints welded. The experimental results show that the FSKSW bonding method is a kind of compound mode that contains a mechanical connection and element diffusion fusion connection, in which mechanical connection has the main decisive function on joints of Mg/steel. Elements diffusion exists in the interfacial region of the joints and the elements diffusion extent is basically the same to that of VDW. The elements' diffusion in Mg/steel using FSKSW is defined in the reaction between small amounts elements of the base metal and zinc-coated metals. The intermetallic compounds and composite oxide perform some reinforcement on the mechanical connection strength.

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Investigation on dissimilar laser welding of advanced high strength steel sheets for the automotive industry

Cited by 121 publications

References 25 publications

Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Effects of Pulsed Nd:YAG Laser Welding Parameters on Penetration and Microstructure Characterization of a DP1000 Steel Butt Joint

Fibre Laser Welding of Dual Phase Steels

The Role of Mechanical Connection during Friction Stir Keyholeless Spot Welding Joints of Dissimilar Materials

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