US 9,808,856 B2
Apparatus and methods for reducing corrosion of joining composite workpieces
Pei-Chung Wang, Troy, MI (US); Chen-Shih Wang, Troy, MI (US); and Ingrid A. Rousseau, Clinton Township, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by Pei-Chung Wang, Troy, MI (US); Chen-Shih Wang, Troy, MI (US); and Ingrid A. Rousseau, Clinton Township, MI (US)
Filed on Sep. 25, 2014, as Appl. No. 14/496,829.
Prior Publication US 2016/0091009 A1, Mar. 31, 2016
Int. Cl. F16B 19/10 (2006.01); B21J 15/02 (2006.01); B21J 15/14 (2006.01); F16B 19/00 (2006.01); F16B 19/04 (2006.01)
CPC B21J 15/027 (2013.01) [B21J 15/147 (2013.01); F16B 19/008 (2013.01); F16B 19/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, for joining a first workpiece and a second workpiece, comprising:
a rivet body comprising (i) a rivet head having an upper surface and a lower surface, wherein the lower surface is opposite the upper surface and configured to be positioned near or in contact with an upper surface of the first workpiece when the apparatus is used to join the workpieces, and (ii) a rivet shank attached to the lower surface of the rivet head, wherein the rivet body is at least partially composed of a non-conductive material that eliminates electrochemical pathways between the rivet body and at least one of the first and second workpieces and the rivet body; and
a mandrel comprising (i) a mandrel shaft configured to be positioned within at least a portion of the rivet shank, and (ii) a mandrel cap positioned on a portion of the mandrel shaft that is in contact with the rivet shank, wherein the mandrel cap is composed of a cap material having a hardness greater than that of the first and the second workpieces, thereby allowing passage of the mandrel cap through the first and second workpieces.