Softening in Weld Heat Affected Zone of Dual Phase Steel Sheet for Automotive Wheel Rim

Kunishige, Kazutoshi; Yamauchi, Nobuyuki; Taka, Takao; Nagao, Noriaki

doi:10.4271/830632

Cited by 14 publications

(5 citation statements)

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“…Heat affected zone softening during welding of DP780 and DP980 spot welds has been reported in the literature. 19,20,70,[115][116][117][118][119][120][121][122][123][124][125] The location of HAZ softening corresponds to the subcritical HAZ. Figure 16 shows microstructure of subcritical HAZ in DP980 spot welds, indicating a tempered martensite microstructure.…”

Section: Heat Affected Zone Softening In Dp Steelsmentioning

confidence: 99%

Critical review of automotive steels spot welding: process, structure and properties

Pouranvari

Marashi

2013

Science and Technology of Welding and Joining

441

375

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Spot welding, particularly resistance spot welding (RSW), is a critical joining process in automotive industry. The development of advanced high strength steels for applications in automotive industry is accompanied with a challenge to better understand the physical and mechanical metallurgy of these materials during RSW. The present paper critically reviews the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds. The focus is on the metallurgical characteristics, hardness-microstructure correlation, interfacial to pullout failure mode transition and mechanical performance of steel resistance spot welds under quasi-static, fatigue and impact loading conditions. A brief review of friction stir spot welding, as an alternative to RSW, is also included.

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Section: Heat Affected Zone Softening In Dp Steelsmentioning

confidence: 99%

Critical review of automotive steels spot welding: process, structure and properties

Pouranvari

Marashi

2013

Science and Technology of Welding and Joining

441

375

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“…The first two factors are influenced by welding process parameters and governed by the net heat input and power density distribution. Previous studies on the weldability of DP 600 indicated that a reduction in strength occurred due to softening in the heat-affected zone [5].…”

Section: Introductionmentioning

confidence: 94%

The Influence of Laser Beam Welding and Plasma Arc Welding Processes on Dual Phase Steel Microstructure

Wibowo¹,

Richardson

2006

AMR

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One important aspect in the application of dual phase (DP) steels in the automotive industry are their weldability and subsequent mechanical properties. Welding involves a rapid change in the temperature which alters the microstructure and the mechanical properties of the steel. Understanding the influence of welding conditions on the mechanical properties of DP 600 is useful for both the automotive industry and steel producers. Despite its importance, the weldability study of dual phase steels is still limited. In this paper the microstructural evolution and its influence on the mechanical properties of 1 mm thick zinc coated DP 600 steel are described for laser beam welding (LBW) and plasma arc welding (PAW) processes. Microstructural and mechanical characterisation were performed using optical microscopy, microhardness measurements, tensile tests and Erichsen cupping tests. The process comparison shows differences in the final mechanical properties resulting from the microstructural differences in the welding zones.

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“…Heat affected zone softening during welding of DP steels has been reported in the literature. 2,4,7,20,[25][26][27][28] The location of HAZ softening corresponds to the subcritical HAZ (i.e. the region in HAZ which experiences temperatures below A c1 critical 2 Effect of welding current and welding time t on FZ size and failure mode: arrows show critical FZ size for each grade below which IF (or partial interfacial) mode was obtained and above that PF mode was observed temperature).…”

Section: Factors Controlling Failure Mode Of Dp Rswsmentioning

confidence: 99%

Section: Factors Controlling Failure Mode Of Dp Rswsmentioning

confidence: 99%

Key factors influencing mechanical performance of dual phase steel resistance spot welds

Pouranvari

Marashi

2010

Science and Technology of Welding and Joining

111

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Quasi-static tensile shear mechanical properties of resistance spot welds of three dual phase (DP) grades including DP600, DP780 and DP980 are investigated. Results showed that weld fusion zone size, failure mode and the strength/ductility of failure location are the main factors governing the peak load and the energy absorption of spot welds. Heat affected zone (HAZ) softening plays an important role in mechanical properties of DP steels with higher volume fraction of martensite (i.e. DP780 and DP980). It was shown that the peak load of the spot welds is not proportionally correlated to the tensile strength of the base metal. Pronounced HAZ softening in DP980 resulted in reducing its tendency to fail in interfacial failure mode in comparison to DP780. In addition, despite its lower base metal ductility, DP980 weld exhibits enhanced ductility and energy absorption than DP780 due to its pronounced HAZ softening.

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Softening in Weld Heat Affected Zone of Dual Phase Steel Sheet for Automotive Wheel Rim

Cited by 14 publications

References 0 publications

Critical review of automotive steels spot welding: process, structure and properties

Critical review of automotive steels spot welding: process, structure and properties

The Influence of Laser Beam Welding and Plasma Arc Welding Processes on Dual Phase Steel Microstructure

Key factors influencing mechanical performance of dual phase steel resistance spot welds

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