Optimization of Resistance Spot Weld Condition for Single Lap Joint of Hot Stamped 22MnB5 by Taking Heating Temperature and Heating Time into Consideration

Choi, Hong-Seok; Kim, Byung-Min; Park, Geun-Hwan; Lim, Woo-Seung; Lee, Sun-Bong

doi:10.3795/ksme-a.2010.34.10.1367

Cited by 14 publications

(8 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, Youn-Suk [18] focused on the microstructure of homogeneous Usibor ® 1500 spot welds and linked the hardness profile with fine microstructure observation. Second, a thermal study of RSW on homogeneous Usibor ® 1500 was done by Hong-Seok [20]. Concerning heterogeneous welding of Usibor ® 1500, results can be found in the literature about a Usibor ® 1500-DP780 steel [27].…”

Section: Introductionmentioning

confidence: 94%

“…Such investigations are however necessary in the global context of vehicle structure optimization introduced above. As a consequence, a number of studies have been dedicated since the 2000s to AHSS welding [8,[17][18][19][20][21][22][23][24][25] and their heterogeneous configurations [15,[26][27][28][29]. Several conclusions can be highlighted in this context: (i) the frequent existence of a critical nugget diameter for failure mode transition (depending on sheet thicknesses) [13]; (ii) the fact that the failure mode of spot welds is not a characteristic of their strength [19]; and (iii) the positive deviation of Cross Tension Strength (CTS) observed for AHSS dissimilar spot welding configurations [14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Huin

Dancette

Fabrègue

et al. 2016

Metals

View full text Add to dashboard Cite

Nowadays, environmental regulation encourages carmakers to reduce the global vehicle weight. Steelmakers develop grades with high performance (Advanced High Strength Steels, AHSS) and fine steel sheet assemblies are used in car body structures, with an optimized thickness in each part. However, unusual fracture modes are sometimes observed during the mechanical tests of heterogeneous AHSS welds, made of dissimilar steel grades and sheet thicknesses. Weld fractures can occur with a strength lower than expected. This study aims at understanding these fracture mechanisms and focuses on two common steel grades joined by Resistance Spot Welding (RSW): DP600 (a dual phase steel) and Usibor ® 1500 (a martensitic steel). The parameters affecting the failure modes and load bearing capacity are investigated during two common types of tests: the Cross Tension and Tensile Shear tests. The positive effects of heterogeneous welding with respect to the corresponding homogeneous configurations are discussed, as well as the consequences of a so-called Dome failure occurring at the weld nugget boundary.

show abstract

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Huin

Dancette

Fabrègue

et al. 2016

Metals

View full text Add to dashboard Cite

show abstract

“…On the other hand, the 22MnB5 has an Al coating, and an intermetallic compound layer (IMC) of Fe 2 Al 5 resulting from diffusion during the hot dipping process is formed between the coated layer and the substrate. After hot stamping, an oxidation layer with small cracks in the Al-coated layer is observed, and the IMC layer also increases by over 10 μm due to diffusion between the coated layer and the substrate during hot stamping [14]. Table 2 shows the mechanical properties of 22MnB5 and GA780DP.…”

Section: Test Materialsmentioning

confidence: 96%

Evaluation of weldability for resistance spot welded single-lap joint between GA780DP and hot-stamped 22MnB5 steel sheets

et al. 2011

Self Cite

View full text Add to dashboard Cite

Recently, in the automotive industry, Al-coated boron steel sheets (22MnB5) have been used for hot stamping, and the use of these sheets makes it possible to achieve a tensile strength of over 1,500 MPa, since a metallurgical transformation from austenite to martensite occurs during the process. In this study, resistance spot welding (RSW) experiments were performed in order to evaluate the weldability of single-lap joints between GA780DP and 22MnB5. The effect of the weld current on the nugget diameter and load-carrying capacity was evaluated by observing the nugget diameter and performing a tensile-shear test. Furthermore, the fracture behavior was evaluated by carrying out optical microscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) observations. Ductile regions were observed on the interfacially fractured surface of the weld, and this implies that a high load-carrying capacity can be obtained even when interfacial fracture (IF) occurs. IF is caused by the stress concentration resulting from the presence of the sharp notch at the boundary of the nugget as well as by the high hardness and the brittle microstructure of the weld; the microstructure is brittle because of the high carbon equivalent (C eq ) and the penetration of Al in the weld.

show abstract

“…For this reason, it is important to adjust these parameters precisely to the specific material to achieve an increase in process stability. The welding parameters can be optimised by various approaches, such as simulation, design of experiment or analysis of the process signals recorded during welding [12,13]. The present investigation is focused on the process data analysis.…”

Section: Introductionmentioning

confidence: 99%

Resistance spot welding with variable electrode force—development and benefit of a force profile to extend the weldability of 22MnB5+AS150

2020

View full text Add to dashboard Cite

Compared with conventional steels, press-hardened steels with an aluminium-silicon coating have a smaller welding range, which is resulting in reduced process stability. For this reason, an analytical methodology is required, which can optimise the welding parameters and extend the welding range significantly. Consequently, most publications focus on the variation of welding time and welding current at a constant electrode force. This paper deals with the design of a force profile to improve weldability and joint quality. The basis for this investigation is the identification of significant characteristic values by the recorded process signals.

show abstract

Optimization of Resistance Spot Weld Condition for Single Lap Joint of Hot Stamped 22MnB5 by Taking Heating Temperature and Heating Time into Consideration

Cited by 14 publications

References 8 publications

Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Investigation of the Failure of Advanced High Strength Steels Heterogeneous Spot Welds

Evaluation of weldability for resistance spot welded single-lap joint between GA780DP and hot-stamped 22MnB5 steel sheets

Resistance spot welding with variable electrode force—development and benefit of a force profile to extend the weldability of 22MnB5+AS150

Contact Info

Product

Resources

About