- Patent Title: Laser welding method for producing a semi-finished sheet metal product made of hardenable steel and comprising a coating based on aluminium or aluminium-silicon
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Application No.: US15755805Application Date: 2016-09-20
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Publication No.: US10543565B2Publication Date: 2020-01-28
- Inventor: Arndt Breuer , Christian Both
- Applicant: WISCO Tailored Blanks GmbH
- Applicant Address: DE Duisburg
- Assignee: WISCO Tailored Blanks GmbH
- Current Assignee: WISCO Tailored Blanks GmbH
- Current Assignee Address: DE Duisburg
- Agency: The Webb Law Firm
- Priority: DE102015115915 20150921
- International Application: PCT/EP2016/072213 WO 20160920
- International Announcement: WO2017/050711 WO 20170330
- Main IPC: B23K26/26
- IPC: B23K26/26 ; C22C38/02 ; B23K35/30 ; B32B15/01 ; C22C38/00 ; C22C38/06 ; C22C38/28 ; C22C38/32 ; C22C38/44 ; B23K103/04

Abstract:
A method for producing a tailor-made semi-finished sheet metal product where two steel sheets of different material grades and/or thicknesses are joined by laser welding. At least one of the sheets is press-hardenable steel having a metallic coating of aluminium or aluminium-silicon. Filler wire is fed into the weld melt. The filler wire is substantially free of aluminium and contains at least one alloy element which promotes the formation of austenite in a content that is at least 0.1 wt. % greater than that in the press-hardenable steel. The filler wire is heated before being fed into the weld melt. The steel sheets have a gap delimited by the edges of the sheets having an average width of at least 0.15 mm. The ratio of the volume of filler wire inserted into the gap to the volume of the steel sheet material melted by the laser beam is at least 20%.
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