• Proceedings of the KWS Conference
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• 2007.11a
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• pp.316-318
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• 2007

Friction Spot Joining(FSJ) has a strong potential for aluminum alloy joining in automobile industries. The present paper focuses on the attempt to optimize the FSJ process for lap joining of A5052-H32 and A6061-T6 aluminum alloys. For A5052 maximum tensile shear strength has been observed for a tool rotating speed of 800rpm and for A6061 at 1000 rpm. Study on fracture modes of the tensile tested specimens of both A5052-H32 and A6061-T6 revealed, for high tensile strength values, plug fracture mode and lower tensile values, shear fracture mode. Above 2000 rpm distortion of the base metal, beside the tool shoulder was larger and plug fracture mode has been observed.

• Proceedings of the KWS Conference
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• 2007.11a
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• pp.155-157
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• 2007

The Friction spot dissimilar welding of galvanized steel/Al6061-T6 was performed to investigate the mechanical characteristics of the joints. The presence of thin film of aluminum oxide on the surface and melting of zinc in the coating, made substandard joint characteristics for dissimilar Friction spot joining(FSJ) performed with out removing the coating. Where as, for dissimilar FSJ of galvanized steel/Al6061-T6 after removing the coating, superior agitation and welding quality has been obtained for a configuration of galvanized steel as the upper plate and Al6061-T6 as lower plate. The results from tensile tests and microscopic examination for various combinations of the welding parameters have been presented.

• Journal of Welding and Joining
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• v.24 no.4
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• pp.1-5
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• 2006

• Journal of Welding and Joining
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• v.24 no.1
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• pp.50-55
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• 2006

In an attempt to optimize friction spot joining process of Al alloys for automobiles, effects of joining parameters such as tool rotating speed, plunging depth, and joining time on the joints properties were investigated. A wide range of joining conditions could be applied to join Al alloys for automobile without defects in the weld zone except for certain welding conditions with a lower heat input. For sound joints without defects, tensile shear strength of joints was higher than acceptable criteria of tensile shear strength of resistance spot welded joints for aluminum.

• Proceedings of the KWS Conference
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• 2006.10a
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• pp.219-221
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• 2006

In an attempt to optimize friction spot joining process of Al alloys for automobiles, Friction spot joining was used make lap feint on strips of AA5052-H32 and AA6022-T4 aluminium alloy. The effects of joining parameters such as tool rotating speed, plunging depth, joining time and kind of upper plate on the joints properties were investigated. An optimal tensile shear strength parameter of a tool rotating speed of 1000rpm, dwell time 2.5sec with upper plate 6022 can be found to make a good joint.

• Proceedings of the KWS Conference
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• 2005.06a
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• pp.177-179
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• 2005

In an attempt to optimize friction spot joining Process of Al alloys for automobiles, joining parameters such as tool rotating seed, plunging depth, and joining time on the joints properties were investigated. A wide range of joining conditions could be applied to join Al alloys for automobile without defects in the weld zone except for certain welding conditions with a lower heat input. for sound joints without defects, tensile shear strength of joints was higher than acceptable criteria of tensile shear strength of resistance spot welded joints for aluminum.

• Proceedings of the KWS Conference
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• 2005.11a
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• pp.183-185
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• 2005

In an attempt to optimize friction spot joining process of Mg alloys, effects of joining parameters such as rotating speed, plunging depth, and dwelling time on the joints properties were evaluated. Experimental tests were carried out for lap joined AZ31B-H24 sheets. A wide range of joining conditions could be applied to join Mg alloys without defects in the weld zone except for certain welding conditions with an insufficient heat input. The microstructures and hardness variations in the weld regions are discussed. For sound joints without defects, tensile shear strength of weld joints was higher approximately 116% than typical tensile shear strength of electrical resistance spot-welded joints for magnesium(Welding handbook, Vol 3, AWS).

• Journal of Welding and Joining
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• v.34 no.3
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• pp.17-22
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• 2016

In terms of mechanical and metallurgical characteristics, the effect of tool plunge depths(0.2, 0.5, 0.7, 1.0, 1.5mm) on weldability in dissimilar Al5083-O/DP590 friction spot joint has been clarified. From the results, it is found that the stirred nugget was stably formed at a plunge depth of more than 0.7mm, which is caused by improved stirring action against each other material. With increasing a plunge depth, the thickness of intermetallic compound(IMC) layer in Al5083-O/DP590 joint has a tendency to increase. The tensile shear strength reaches to the maximum failure load of 6.5kN at a plunge depth of 0.7mm due to relatively small decrease in the thickness of Al5083-O sheet and relatively minute thickness of IMC layer, compared with those of other plunge depth conditions.

• Proceedings of the KWS Conference
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• 2009.11a
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• pp.41-41
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• 2009

To evaluate the applicability of dissimilar joining between Mg and Al alloys in automobile manufacturing process, solid state joining processes such as magnetic pulse welding(MPW), friction stir welding(FSW) and friction spot joining(FSJ) were attempted successfully. MPW process has been concentrated mainly on round section tube to tube and tube to bar welds. AZ31 Mg alloy has been successfully welded to pure Al A1070 as well as to Al alloy A3003. While, for friction stir welding of dissimilar sheet joints, AZ31B/A6061 with the thickness of 2mm were used and a square butt joint with a good quality was obtained at the conditions of 0.8mm/sec of travel speed and tool rotation speed of 850rpm. The maximum tensile strength of 179 MPa, which was about 80 % of the Mg base metal tensile strength, has been obtained. Finally, friction spot joining was attempted to make a dissimilar lap joint between AZ31(0.8mm) and A6061(1mm), while the joint exhibited the same level of tensile shear strength as that of similar Mg joint.