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Process and System for Laser Welding Pre-Coated Sheet Metal Workpieces

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
A process for laser-welding pre-coated sheet metal plates comprises loading two pre-coated sheet metal plates at a workstation, such that edges of the plates that are to be welded together are butted against one another. Each plate has a steel substrate and a pre-coat layer, the pre-coat layer including an intermetallic alloy layer and a metallic alloy layer. In a single pass, an area of each plate adjacent to the edges that are butted against one another is irradiated with a defocussed laser beam, thereby melting material of the pre-coat layer within said area of each plate. During the single pass, a stream of a gas is used to blow the melted pre-coat material out of the irradiated areas of the two plates. Absent removing the two plates from the workstation, laser-welding the plates together is performed using a focused laser beam.
Gu, Hongping (Newmarket, CA), Shulkin, Boris (West Bloomfield, MI), Mueller, Robert (Milton, CA), Brady, Jeremiah John (Knoxville, TN)
15/ 311,832
June 19, 2015