Dissimilar spot welding of dual phase steel/ferritic stainless steel: phase transformations

2014 ◽  
Vol 19 (7) ◽  
pp. 565-571 ◽  
Author(s):  
H. L. Jaber ◽  
M. Pouranvari ◽  
S. P. H. Marashi ◽  
M. Alizadeh-Sh ◽  
R. K. Salim ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Phase Transformations ◽  
Ferritic Stainless Steel ◽  
Spot Welding ◽  
Dual Phase Steel ◽  
Dual Phase

Cold Formability of Automotive Sheet Metals: Anisotropy, Localization, Damage and Ductile Fracture

2015 ◽  
Vol 639 ◽  
pp. 353-360 ◽  
Author(s):  
Jun He Lian ◽  
Deok Chan Ahn ◽  
Dong Chul Chae ◽  
Sebastian Münstermann ◽  
Wolfgang Bleck
Keyword(s):  
Stainless Steel ◽  
Ductile Fracture ◽  
Ferritic Stainless Steel ◽  
Steel Sheet ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Damage Development ◽  
Modelling Framework ◽  
Automotive Sheet ◽  
Two Phases

Experimental and numerical investigations on the characterization and prediction of cold formability of two different types of automotive steel sheets, a ferritic stainless steel sheet (AISI 439) and a dual-phase steel sheet (DP600) are performed in this study. Due to the different microstructure configurations, these two steels show significant differences in plasticity behavior as well as failure mechanisms. The ferritic stainless steel shows strong anisotropic plastic deformation in terms of both yielding and hardening, whereas the dual-phase steel behaves quite isotropic resulting from the mixture of two phases. However, unlike the localization dominant failure mechanism of the ferritic stainless steel, the incompatible deformation due to the distinctions of the mechanical properties of two phases naturally results in early damage and extensive damage development prior to localization, or ductile fracture without localization. In this study, all these features are taken into account for an accurate prediction of formability. A general modelling framework with specifications for these separate features is formulated and applied to the two steels.

Research on Resistance Spot Welding of DP980 Dual Phase Steel

2013 ◽  
Vol 860-863 ◽  
pp. 780-783
Author(s):  
Qiao Bo Feng ◽  
Yun Feng Zhu ◽  
He Xin Zhao
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Dual Phase Steel ◽  
Welding Current ◽  
High Resistivity ◽  
Dual Phase ◽  
Welding Joint ◽  
Resistance Spot ◽  
Electrode Force

The process parameters and quality of resistance spot welding for DP980 dual phase steel were studied through the orthogonal experiment method, and the influence of welding current, welding time and electrode force on the strength of welding joint has been discussed. The results show that the welding current has the greatest influence on the quality of welding joint for DP980 dual phase steel, and it needs relatively lower welding current for the DP980 dual phase steel as it has high resistivity, and appropriate increasing of electrode force is a feasible way to avoid the defect of shrinkage and it improves the joint strength.

scholarly journals MULTI-OBJECTIVE OPTIMIZATION OF THE RESISTANCE SPOT-WELDING PROCESS PARAMETERS FOR THE WELDING OF DUAL-PHASE STEEL DP500

2021 ◽  
Vol 55 (2) ◽  
pp. 201-206
Author(s):  
Aleksija Djuric ◽  
Dragan Milčić ◽  
Damjan Klobčar ◽  
Biljana Marković
Keyword(s):  
Automotive Industry ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Dual Phase Steel ◽  
Mechanical Characteristics ◽  
Welding Process ◽  
Dual Phase ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Resistance Spot

Resistance spot welding (RSW) is still the most used form of welding in the automotive industry, primarily for welding steel. One of the advanced steels used in the automotive industry is dual-phase steel, so it is important to properly select the welding parameter for these steels. Therefore, this paper presents multi-objective optimization in the RSW welding process of DP 500 steel. The paper considers three different mechanical characteristics i.e., the failure load (F), failure displacement (l) and weld nugget diameter (D), as all these welding characteristics play significant roles in evaluating the quality of spot welding. The results show that the welding current is the most influential parameter with respect to the mechanical characteristics. The effect of welding time on the weld quality is the least significant. The optimal parameters for welding DP 500 steel obtained in this paper are weld current 8 kA, electrode force 4.91 kN and weld time 400 ms.

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