- Patent Title: Resistance spot welding method for joining zinc coated steel sheets
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Application No.: US16492437Application Date: 2018-02-27
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Publication No.: US11590599B2Publication Date: 2023-02-28
- Inventor: Céline Musik , Kangying Zhu , Didier Hun , Jean-Michel Mataigne , Astrid Perlade , Renaud Frappier
- Applicant: ArcelorMittal , Universite de Nantes
- Applicant Address: LU Luxembourg; FR Nantes
- Assignee: ArcelorMittal,Universite de Nantes
- Current Assignee: ArcelorMittal,Universite de Nantes
- Current Assignee Address: LU Luxembourg; FR Nantes
- Agency: Davidson, Davidson & Kappel, LLC
- Priority: WOPCT/IB17/00218 20170307
- International Application: PCT/IB2018/051239 WO 20180227
- International Announcement: WO2018/163017 WO 20180913
- Main IPC: B23K11/11
- IPC: B23K11/11 ; B23K11/16 ; B32B15/01 ; B23K101/18 ; B23K103/04 ; B23K101/34 ; B23K101/00

Abstract:
A method for resistance spot welding comprising the following successive steps: —providing at least two steel sheets with thickness (th) comprised between 0.5 and 3 mm, at least one of the sheets being a zinc or zinc-alloy coated steel sheet (A) with a tensile strength (TS) higher than 800 MPa and a total elongation (TEL) such as (TS)×(TEL)>14000 MPa %, wherein the composition of the steel substrate of (A) contains, in weight: 0.05%≤C≤0.4%, 0.3%≤Mn≤8%, 0.010%≤Al≤3%, 0.010%≤Si≤2.09%, with 0.5%≤(Si+Al)≤3.5%, 0.001%≤Cr≤1.0%, 0.001%≤Mo≤0.5% and optionally: 0.005%≤Nb≤0.1%, 0.005%≤V≤0.2%, 0.005%≤Ti≤0.1%, 0.0003%≤B≤0.005%, 0.001%≤Ni≤1.0%, the remainder being Fe and unavoidable impurities, —performing resistance spot welding of the at least two steel sheets for producing a weld with an indentation depth (IDepth) on the surface of said steel sheet (A) such as: 100 μm≤(IDepth)≤18.68 (Znsol)−55.1, wherein (IDepth) is in micrometers and wherein Znsol is the solubility of Zn in the steel of sheet (A) at 750° C., in weight %.
Public/Granted literature
- US20200009679A1 Resistance Spot Welding Method for Joining Zinc Coated Steel Sheets Public/Granted day:2020-01-09
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