Advisable Grades of High-Strength Steel Sheets and Welding Conditions for Spot-Weld Strength in Automotive Body Application

Sakuma, Yasuharu; Hiwatashi, Shunji; Oikawa, Hatsuhiko

doi:10.4271/2003-01-2774

Cited by 4 publications

(8 citation statements)

References 3 publications

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“…The TSS and CTS data are determined using standard methods 13 13,14 The two measures of strength increased in both steels with the nugget size, as is already known 17. However, it is noteworthy that alloy 3LA shows a more prominent improvement in CTS with nugget size.…”

Section: Resultsmentioning

confidence: 88%

“…13,14 The two measures of strength increased in both steels with the nugget size, as is already known. 17 However, it is noteworthy that alloy 3LA shows a more prominent improvement in CTS with nugget size. Even though the microstructural parameters that govern these measures of strength are not clearly understood, it has been reported for conventional steels that the shear strength scales with that of the base metal, but the CTS tends to deteriorate when the carbon equivalent exceeds 0?24 wt-%.…”

Section: Resultsmentioning

confidence: 94%

“…Because a higher welding current produces a larger fused volume, the size of the weld nugget naturally increases with the current. The weld strength is in turn related to the nugget size [15][16][17] so that a greater current leads to a stronger weld, but a limiting condition is reached when instabilities arise, and the material is expelled in liquid form. 18 the change in nugget size with current.…”

Section: Resultsmentioning

confidence: 99%

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Spot weldability of TRIP assisted steels with high carbon and aluminium contents

Jung

Lee

et al. 2012

Science and Technology of Welding and Joining

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We examine here the spot welding characteristics of transformation induced plasticity assisted steels, which contain d-ferrite as a consequence of their aluminium concentrations of 3?5 or 5?6 wt-% and which also have high carbon contents of 0?3 or 0?4 wt-% when compared with conventional automotive steels. The resistance spot welds are tested in both shear and crosstensile tests in order to determine the so called ductility ratio, which is a parameter associated with the fitness of such welds for automotive applications. With an increase in the d-ferrite fraction from 0?19 to 0?5, the hardness variation across the weld and heat affected zone is decreased approximately from 400 to 150 HV. It seems that the presence of stable d-ferrite is helpful in reducing hardness variations and in achieving a significant ductility ratio of 0?39.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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Spot weldability of TRIP assisted steels with high carbon and aluminium contents

Jung

Lee

et al. 2012

Science and Technology of Welding and Joining

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“…Sakuma and Oikawa [23] and Sakuma et al [24] proposed a similar correlation (Eq. ( 28)) for the CTS as Eq.…”

Section: Cts Hardmentioning

confidence: 79%

“…Sakuma and Oikawa [23] and Sakuma et al [24] also proposed a correlation for STS either from the weld nugget strength and size (Eq. ( 13)),…”

Section: Stsmentioning

confidence: 99%

Global Approach on the Shear and Cross Tension Strength of Resistance Spot Welded Thin Steel Sheets

Májlinger,

Katula,

Varbai

2023

Period. Polytech. Mech. Eng.

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Several correlations from the professional literature describing the shear and cross tension strength (STS and CTS) of resistance spot welded (RSWed) thin steel sheets were investigated. Some of them need chemical composition or weld nuggets strength hardness as input parameters, making them hardly applicable in the planning stage of the joints. Using STS and CTS data collected from over 250 papers, selected correlations were tested, whether they are applicable to predict the STS and CTS of the RSWed joints at the planning stage to help designers plan their static-loaded welds strength. Most correlations had limitations in the applicable base materials' tensile strength range. Therefore, new equations for STS and CTS are proposed, which can be used to plan in the 300–18900 MPa base metals tensile strength range for similar and dissimilar RSWed joints of thin steel sheets.

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Application Development of Low Carbon Type Dual Phase 980MPa High Strength Steel

Takakura

Takagi

Yoshinaga³

2006

SAE Technical Paper Series

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Advisable Grades of High-Strength Steel Sheets and Welding Conditions for Spot-Weld Strength in Automotive Body Application

Cited by 4 publications

References 3 publications

Spot weldability of TRIP assisted steels with high carbon and aluminium contents

Spot weldability of TRIP assisted steels with high carbon and aluminium contents

Global Approach on the Shear and Cross Tension Strength of Resistance Spot Welded Thin Steel Sheets

Application Development of Low Carbon Type Dual Phase 980MPa High Strength Steel

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