A study on dissimilar welding of aluminum alloy and advanced high strength steel by spot welding process

2017 ◽  
Vol 18 (1) ◽  
pp. 121-126 ◽  
Author(s):  
Young-Gon Kim ◽  
Bum-Ji Jo ◽  
Ji-Sun Kim ◽  
In-Ju Kim
Keyword(s):  
Aluminum Alloy ◽  
High Strength Steel ◽  
Spot Welding ◽  
Welding Process ◽  
High Strength ◽  
Dissimilar Welding ◽  
Advanced High Strength Steel

scholarly journals Validated Multi-Physical Finite Element Modelling of the Spot Welding Process of the Advanced High Strength Steel DP1200HD

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5411
Author(s):  
Konstantin Prabitz ◽  
Marlies Pichler ◽  
Thomas Antretter ◽  
Holger Schubert ◽  
Benjamin Hilpert ◽  
...  
Keyword(s):  
Finite Element ◽  
High Strength Steel ◽  
Spot Welding ◽  
Base Material ◽  
Welding Process ◽  
High Strength ◽  
Parameter Determination ◽  
Fe Model ◽  
Advanced High Strength Steel ◽  
Local Risk

Resistance spot welding (RSW) is a common joining technique in the production of car bodies in white for example, because of its high degree of automation, its short process time, and its reliability. While different steel grades and even dissimilar metals can be joined with this method, the current paper focuses on similar joints of galvanized advanced high strength steel (AHSS), namely dual phase steel with a yield strength of 1200 MPa and high ductility (DP1200HD). This material offers potential for light-weight design. The current work presents a multi-physical finite element (FE) model of the RSW process which gives insights into the local loading and material state, and which forms the basis for future investigations of the local risk of liquid metal assisted cracking and the effect of different process parameters on this risk. The model covers the evolution of the electrical, thermal, mechanical, and metallurgical fields during the complete spot welding process. Phase transformations like base material to austenite and further to steel melt during heating and all relevant transformations while cooling are considered. The model was fully parametrized based on lab scale material testing, accompanying model-based parameter determination, and literature data, and was validated against a large variety of optically inspected burst opened spot welds and micrographs of the welds.

scholarly journals Effect of Severe Welding Conditions on Liquid Metal Embrittlement of a 3rd-Generation Advanced High-Strength Steel

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1166
Author(s):  
Outhmane Siar ◽  
Yacine Benlatreche ◽  
Thomas Dupuy ◽  
Sylvain Dancette ◽  
Damien Fabrègue
Keyword(s):  
Liquid Metal ◽  
High Strength Steel ◽  
Spot Welding ◽  
High Strength ◽  
Holding Time ◽  
Liquid Metal Embrittlement ◽  
Welding Parameters ◽  
Advanced High Strength Steel ◽  
Electrode Force ◽  
Influential Parameters

The occurrence of liquid metal embrittlement (LME) during the resistance spot-welding of a zinc-coated Advanced High-Strength Steel (TRIP-aided AHSS) is investigated in this work. Welds are generated using controlled degradation of the welding conditions to favor the occurrence of LME cracks in a two-sheets homogeneous configuration. Detailed inspection of the welds shows that electrode misalignment, short holding time, low electrode force and long welding time constitute a propitious environment for both inner and outer LME cracks. A statistical analysis allows weighting and interpreting of the significance of the welding parameters. Electrode misalignment and reduced holding time appear as the most influential parameters in the design of experiment. Moreover, it is worth noting that standard ISO welding conditions are prone to avoid any LME cracks in the investigated two-sheets homogeneous configuration.

Behavior and Quality Evaluation of Electroplastic Self-Piercing Riveting of Aluminum Alloy and Advanced High Strength Steel

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Ming Lou ◽  
YongBing Li ◽  
YaTing Li ◽  
GuanLong Chen
Keyword(s):  
Shear Strength ◽  
Aluminum Alloy ◽  
High Strength Steel ◽  
High Strength ◽  
Tensile Shear Strength ◽  
Advanced High Strength Steel ◽  
Tensile Shear ◽  
Cold Forming ◽  
Riveting Process ◽  
Cross Tension

The hybrid use of dissimilar lightweight materials, such as aluminum alloy and advanced high strength steel (AHSS), has become a critical approach to reduce the weight of ground transportation vehicles. Self-piercing riveting (SPR) as a preferred cold-forming fastening method is facing problems like weak interlocking and insufficient penetration, due to the reduced formability of AHSS. In this paper, a new process named electroplastic self-piercing riveting (EP-SPR) was proposed to reduce the deformation resistance of AHSS DP780, by applying a direct current (dc) to it during the riveting process. The influence of dc on force and displacement characteristics throughout the riveting process, joint physical attributes and quasi-static performances for two sheet combinations, e.g., AA6061-T6 to DP780 (combination 1) and DP780 to AA6061-T6 (combination 2), were studied and compared with the traditional SPR joints. The results showed that compared with the traditional SPR joints, the EP-SPR ones increased by 12.5% and 23.3% in tensile-shear strength and cross-tension strengths for combination 1, respectively. For combination 2, even though the EP-SPR joints decreased by 5.8% in tensile-shear strength, it could reduce the penetration risk of bottom AA6061-T6, and present a better energy absorption capability for the increased undercut amount. In addition, the corresponding cross-tension strength of EP-SPR joints still increases by 6.1%.

Sign in / Sign up

Export Citation Format

Share Document