Method For Producing Rivet Joint, Rivet Joint, And Automobile Part

Abstract: A method for producing a rivet joint according to one embodiment of the present invention comprises passing the shaft part of a steel rivet having the shaft part and a head part through a through-hole in a plurality of overlapped sheet materials, sandwiching the rivet between a pair of electrodes in the axial direction of the rivet, applying pressure and a current to the rivet by means of the pair of electrodes, thereby forming a modified portion at the distal end of the shaft part, and cooling the rivet, wherein the Vickers hardness HB of the head part of the cooled rivet satisfies the equation 130=HB=330, and the Vickers hardness HA of the modified portion of the cooled rivet, the thickness TA of the modified portion, the Vickers hardness HJ of an area in the center of the shaft part in the axial direction and in the center in the radial direction, the diameter DJ of the shaft part, the Vickers hardness HB of the head part, and the thickness TB of the head part satisfy the equations HJ×DJ=4.7×HB×TB and HA×TA=1.3×HB×TB.

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