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Weldment of different materials and resistance spot welding method

  • US 7,473,864 B2
  • Filed: 05/19/2004
  • Issued: 01/06/2009
  • Est. Priority Date: 05/19/2004
  • Status: Expired due to Term
First Claim
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1. A weldment of different materials, the weldment having a ductile fracture energy of at least 7.5 Joules, comprising:

  • an aluminum or aluminum alloy sheet and an aluminum-coated steel sheet having an aluminum coated layer with a thickness of 15 μ

    m or more, said aluminum or aluminum alloy sheet and said aluminum-coated steel sheet being resistance spot welded,wherein a joined part exists on an interface between the aluminum or aluminum alloy sheet and the aluminum-coated steel sheet, and wherein the area of an intermetallic compound layer in the joined part is 60% or less of the total area of the joined part constituting the intermetallic compound layer and the melted and solidified region created by the resistance spot welding,wherein the aluminum-coated steel sheet comprises a steel substrate containing 0.002% by mass or more of N.

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