Steel/aluminum welded structure

Details Steel/aluminum welded structure Steel/aluminum welded structure

2011-03-15

2011-03-15

McNeil, Jennifer C (Department: 1784)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C428S654000, C428S681000

Reexamination Certificate

active

07906220

ABSTRACT:
A steel/aluminum welded structure comprises a hot-dip Al-coated steel sheet1spot welded with an aluminum or aluminum alloy sheet2. The steel sheet1is coated with a coating layer4containing, by mass, 3-12% of Si and 0.5-5% of Fe. An area ratio of an Al—Fe binary alloy layer, formed at the joint boundary, is controlled to 90% or less. An unalloyed region9exists between an Al—Fe—Si ternary alloy layer6at an interface of a steel substrate5with the coating layer4interface and the Al—Fe binary alloy layer at the joint boundary. A steel substrate5preferably contains 0.002-0.020% of N for formation of a N-enriched surface layer in contact with the coating layer4. The N-enriched layer impedes propagation of the brittle Al—Fe binary alloy layer to the whole of the joint boundary and raises joint strength of the steel/aluminum welded structure.

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