Journal ArticleDOI
Effects of weld microstructure on static and impact performance of resistance spot welded joints in advanced high strength steels
M. I. Khan,M. L. Kuntz,Y. Zhou +2 more
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TLDR
In this article, the fracture paths within the joint microstructure of spot welded AHSS, including dual phase (DP), transformation induced plasticity (TRIP), and ferritic-bainitic (FB), were compared to new high strength low alloy steels.Abstract:
Evaluating the impact performance of resistance spot welded joints in advanced high strength steels (AHSS) is critical for their continued integration into the automotive architecture. The effect of strain rate on the joint strength and failure mode is an important consideration in the design of welded structures. Recent results suggest that the failure mode is dependent upon the strength, chemistry, and processing of AHSS. Current literature, however, does not explain the effects of weld microstructure and a comprehensive comparison has yet to be conducted. The present study details the fracture paths within the joint microstructure of spot welded AHSS, including dual phase (DP), transformation induced plasticity (TRIP) and ferritic–bainitic (FB), in comparison to new high strength low alloy steels. Quasi-static and impact tests were conducted using a universal tensile tester and an instrumented drop tower respectively. Results for elongation, failure load and energy absorption for each material ...read more
Citations
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Journal ArticleDOI
Critical review of automotive steels spot welding: process, structure and properties
TL;DR: In this article, the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds is discussed. And a brief review of friction stir spot welding, as an alternative to RSW, is also included.
Journal ArticleDOI
Failure mode transition in AHSS resistance spot welds. Part I. Controlling factors
TL;DR: In this paper, the authors investigated and analyzed the transition between interfacial and pull-out failure modes in AHSS resistance spot welds during the tensile-shear test by the use of analytical approach.
Journal ArticleDOI
Key factors influencing mechanical performance of dual phase steel resistance spot welds
TL;DR: In this paper, the peak load of the spot welds is not proportionally correlated to the tensile strength of the base metal, and the strength/ductility of failure location is one of the main factors governing peak load and energy absorption of spot weld.
Journal ArticleDOI
Influence of fusion zone size and failure mode on mechanical performance of dissimilar resistance spot welds of AISI 1008 low carbon steel and DP600 advanced high strength steel
TL;DR: In this paper, the effect of welding parameters (welding time, welding current and electrode force) on the overload failure mode and mechanical performance of dissimilar resistance spot welds between drawing quality special killed AISI 1008 low carbon steel and DP600 dual phase steel was investigated.
Journal ArticleDOI
Microstructure and Mechanical Properties of Resistance Spot Welded Advanced High Strength Steels
TL;DR: In this paper, the authors examined resistance spot welding of advanced high strength steels (AHSS) including 590R, DP600, DP780 and TRIP780, and the mechanical properties and microstructure of these resistance welded steel alloys were detailed.
References
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Journal ArticleDOI
Supra-Ductile and High-Strength Manganese-TRIP/TWIP Steels for High Energy Absorption Purposes
TL;DR: In this paper, the microstructural properties of advanced high strength and supra-ductile TRIP and TWIP steels with high-manganese concentrations (15 to 25 mass%) and additions of aluminum and silicon (2 to 4mass%) were investigated as a function of temperature (−196 to 400°C) and strain rate (10−4≤e≤103 s−1).
BookDOI
Resistance welding : fundamentals and applications
Hongyan Zhang,Jacek Senkara +1 more
TL;DR: WELDING METALLURGY Solidification in Resistance Spot Welding Phase Transformations in RSW Cracking References ELECTROTHERMAL Processes of WELDING Introduction Electrical Characteristics of Resistance Welding Thermal Characteristics and Electrode Life Lobe Diagrams References WELD DISCONTINUITIES Classification of Discontinuities as mentioned in this paper.
Journal ArticleDOI
Comparison of the effects of silicon and aluminium on the tensile behaviour of multiphase trip-assisted steels
TL;DR: In this article, the authors evaluated the influence of aluminium and silicon contents, in view of the development of multiphase TRIP-assisted steels, on the extent of the transformation induced plasticity (TRIP) effect.
Journal ArticleDOI
Resistance and friction stir spot welding of DP600: a comparative study
TL;DR: In this article, a comparative study of RSW and FSSW on spot welding AHSS has been conducted and the results show a correlation found among microstructure, failure loads, energy requirements and bonded area for both spot welding processes.
Journal ArticleDOI
Tensile-Shear Forces and Fracture Modes in Single and Multiple Weld Specimens in Dual-Phase Steels
TL;DR: In this paper, a tensile-shear test of spot welds in dual-phase (DP) steels was performed and three empirical equations were inferred from least-squares root-fitting analyses of tensile shear testing data.