Metal fusion bonding – Process – Using dynamic frictional energy
Patent
1997-11-12
2000-02-01
Heinrich, Samuel M.
Metal fusion bonding
Process
Using dynamic frictional energy
2281791, 228254, H01L 2160, B23K 2012
Patent
active
060192720
ABSTRACT:
There is disclosed herein a method for attaching a terminal to a metallic mating surface on a workpiece by friction joining, comprising the steps of: (1) providing the terminal and the workpiece, wherein the terminal comprises an electrically conductive body having a top end to which an electrical connector may be attached, a bottom end having a bottom surface generally conforming to the mating surface of the workpiece, a rotational axis substantially orthogonal to the bottom surface about which the terminal may be rotated, and a layer of solder attached to the bottom surface wherein the layer has an outer perimeter and defines a central solder-free region about the axis; (2) rotating the terminal about its rotational axis at a predetermined rotational speed while holding the workpiece stationary; (3) pressing together the rotating terminal and the stationary workpiece using a predetermined forging force for a predetermined length of time, so as to promote a galling bond between the mating surfaces; and (4) abruptly stopping the rotation of the terminal. During the pressing together step, the solder is generally maintained at an average temperature below its melting temperature.
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Allor Richard Lawrence
Badgley John Scott
Samir Samir
White Dawn Roberta
Ford Global Technologies Inc.
Heinrich Samuel M.
Hodges Leslie C.
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