• Proceedings of the KWS Conference
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• 2003.11a
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• pp.132-134
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• 2003

• Proceedings of the KWS Conference
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• 1997.10a
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• pp.112-115
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• 1997

• Proceedings of the KWS Conference
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• 1997.10a
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• pp.169-171
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• 1997

• Proceedings of the KWS Conference
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• 2002.05a
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• pp.29-32
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• 2002

• Proceedings of the KWS Conference
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• 2002.05a
• /
• pp.33-35
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• 2002

• Proceedings of the KWS Conference
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• 2001.05a
• /
• pp.139-142
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• 2001

• Proceedings of the KWS Conference
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• 1995.04a
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• pp.96-98
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• 1995

• Proceedings of the KWS Conference
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• 1993.10a
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• pp.30-32
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• 1993

• Proceedings of the KWS Conference
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• 2005.11a
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• pp.192-194
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• 2005

Joint strength of spot friction welded 5J32 Al alloy were investigated according to the tool shape and the tool penetration depth. General spot friction stir welding tool consists of a shoulder having bigger diameter and a threaded pin projected from the shoulder, which resulted in the generation of large up-lifting of upper plate around the weld nugget because of the deeper penetration and the severe stirring effect of threaded pin. Two kinds of welding tools without the threaded pin were used to avoid the distortion and improve the joint strength. One was a simple cylindrical shape and the other was cylindrical shape with small projection. Therefore, the process was named as spot friction welding comparing to spot friction stir welding because spot friction welding don't use a stirring effect. Using the cylindrical shape tool with small projection, the up-lifting of upper plate were avoided and joint strength were superior to that of the joint using simple cylindrical shape tool. At the 0.5mm of too penetration depth using cylindrical tool with small projection, nugget pull fracture mode can be observed and shear fracture mode were dominant at the rest conditions.

• Journal of Welding and Joining
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• v.16 no.2
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• pp.84-92
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• 1998

On this study, the variations of hardness and microstructure were observed at he spot-welded part of 5182 alminum alloy sheets with thickness of 1.2 mm. The hardness of spot-welded part of aluminum alloy indicated the lowest value at nugget center. Also, the position where fatigue crack exists was investigated by surveying microstructure of the spot-welded sections. Mean load-deformation diagrams were obtained from static tensile test. Fracture was occurred completely within 5 mm after transforming elastic into plastic area. Fatigue test was stopped when the specimens of fatigue test had the final displacement of 0.2mm and measured fatigue bending angle and crack length. This study utilized them, investigated the relations between fatigue bending angle and fatigue crack length and made a estimation of the fatigue fracture life of resistance spot welded part of 5182 aluminum alloy sheet. The relative equation o fatigue crack length and fatigue failure life can be represented by {TEX}$L_{C}${/TEX}=α{TEX}$N_{f}^ {β}${/TEX}.