Friction spot joining of high strength steel sheets for automotives

Ryoji Ohashi; Mitsuo Fujimoto; Sergey Mironov; Yutaka S. Sato; Hiroyuki Kokawa

doi:10.1007/BF03266711

Friction spot joining of high strength steel sheets for automotives

Ryoji Ohashi, Mitsuo Fujimoto, Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa

ENG - Materials Processing

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

In this study, friction spot joining (FSJ) was applied to dual-phase steel DP980 using a newly-developed silicon nitride (Si₃N₄) tool with a threaded pin, after which microstructure and strength of the joint were examined. The cross-sectional microstructure was distinctly classified into four zones which experienced the different heat cycles and deformation histories during FSJ. Electron probe micro analyzer revealed that silicon, oxygen and nitrogen were involved in the alternate band patterns observed in the stir zone, which could be attributed to contamination from the tool. The contamination was prevented by coating of the tool surface and the use of Ar shielding. The mechanical tests showed that the contamination reduced the joint strength, especially the cross tensile strength.

Original language	English
Pages (from-to)	23-27
Number of pages	5
Journal	Welding in the World, Le Soudage Dans Le Monde
Volume	53
Issue number	5-6
DOIs	https://doi.org/10.1007/BF03266711
Publication status	Published - 2009

Keywords

Automobile engineering
Friction welding
Hardness
Lap joints
Mechanical properties
Microstructure
Strength

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10.1007/BF03266711

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title = "Friction spot joining of high strength steel sheets for automotives",

abstract = "In this study, friction spot joining (FSJ) was applied to dual-phase steel DP980 using a newly-developed silicon nitride (Si3N4) tool with a threaded pin, after which microstructure and strength of the joint were examined. The cross-sectional microstructure was distinctly classified into four zones which experienced the different heat cycles and deformation histories during FSJ. Electron probe micro analyzer revealed that silicon, oxygen and nitrogen were involved in the alternate band patterns observed in the stir zone, which could be attributed to contamination from the tool. The contamination was prevented by coating of the tool surface and the use of Ar shielding. The mechanical tests showed that the contamination reduced the joint strength, especially the cross tensile strength.",

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T1 - Friction spot joining of high strength steel sheets for automotives

AU - Ohashi, Ryoji

AU - Fujimoto, Mitsuo

AU - Mironov, Sergey

AU - Sato, Yutaka S.

AU - Kokawa, Hiroyuki

PY - 2009

Y1 - 2009

N2 - In this study, friction spot joining (FSJ) was applied to dual-phase steel DP980 using a newly-developed silicon nitride (Si3N4) tool with a threaded pin, after which microstructure and strength of the joint were examined. The cross-sectional microstructure was distinctly classified into four zones which experienced the different heat cycles and deformation histories during FSJ. Electron probe micro analyzer revealed that silicon, oxygen and nitrogen were involved in the alternate band patterns observed in the stir zone, which could be attributed to contamination from the tool. The contamination was prevented by coating of the tool surface and the use of Ar shielding. The mechanical tests showed that the contamination reduced the joint strength, especially the cross tensile strength.

AB - In this study, friction spot joining (FSJ) was applied to dual-phase steel DP980 using a newly-developed silicon nitride (Si3N4) tool with a threaded pin, after which microstructure and strength of the joint were examined. The cross-sectional microstructure was distinctly classified into four zones which experienced the different heat cycles and deformation histories during FSJ. Electron probe micro analyzer revealed that silicon, oxygen and nitrogen were involved in the alternate band patterns observed in the stir zone, which could be attributed to contamination from the tool. The contamination was prevented by coating of the tool surface and the use of Ar shielding. The mechanical tests showed that the contamination reduced the joint strength, especially the cross tensile strength.

KW - Automobile engineering

KW - Friction welding

KW - Hardness

KW - Lap joints

KW - Mechanical properties

KW - Microstructure

KW - Strength

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JO - Welding in the World, Le Soudage Dans Le Monde

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Friction spot joining of high strength steel sheets for automotives

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Keywords

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