US Patent No. 10,335,892

WELD ELECTRODE FOR ATTRACTIVE WELD APPEARANCE


Patent No. 10,335,892
Issue Date July 02, 2019
Title Weld Electrode For Attractive Weld Appearance
Inventorship David R. Sigler, Shelby Township, MI (US)
James G. Schroth, Troy, MI (US)
Michael J. Karagoulis, Okemos, MI (US)
Assignee GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)

Claim of US Patent No. 10,335,892

1. A welding electrode comprising: a body of the welding electrode, which welding electrode forms electrical resistance spot welds in an assembly of overlying metal workpieces that comprises at least one aluminum alloy workpiece, the body having an end; a convex weld face supported at the end of the body; and ringed protrusions that project outwardly from the convex weld face and are positioned to make contact with and indent into a surface of the aluminum alloy workpiece when the convex weld face of the welding electrode is brought into contact with the assembly of overlying sheet metal workpieces during a resistance spot welding operation, the ringed protrusions being radially spaced from one another on the convex weld face and each of the ringed protrusions having a circumference that surrounds a center of the convex weld face, wherein each of the ringed protrusions has rounded corners when viewed in cross-section, and wherein an innermost ringed protrusion of the ringed protrusions rises to a height above a portion of the convex weld face surrounded by the innermost ringed protrusion.