Plated aluminum sheet having improved spot weldability
First Claim
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1. A spot welded plated aluminum sheet having improved spot weldability which comprises an aluminum sheet having on one or both surfaces a plated coating of a metal which has a melting point of about 700°
- C. or above, the plated coating being present in a thickness sufficient to improve efficiency of spot welding of the aluminum sheet, the plated coating having a higher electric resistivity and lower thermal conductivity than the aluminum sheet, the plated coating having a hardness higher than the aluminum sheet, and the hardness being high enough to improve sliding properties and improve press-formability of the aluminum sheet, the plated coating being a zinc base alloy containing at least one of Cr, Mn, Fe, Co and Ni, the plated coating forming an exposed layer of the plated aluminum sheet.
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Abstract
A plated aluminum sheet has improved spot weldability and press-formability and is suitable for use in the manufacture of automobile bodies. The aluminum sheet has a plated coating of a metal having a melting point of about 700° C. or above, e.g., Cr, Mn, Fe, Co, or Ni, an alloy of two or more of these metals, or a Zn alloy with at least one of these metals, on one or both surfaces thereof.
28 Citations
13 Claims
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1. A spot welded plated aluminum sheet having improved spot weldability which comprises an aluminum sheet having on one or both surfaces a plated coating of a metal which has a melting point of about 700°
- C. or above, the plated coating being present in a thickness sufficient to improve efficiency of spot welding of the aluminum sheet, the plated coating having a higher electric resistivity and lower thermal conductivity than the aluminum sheet, the plated coating having a hardness higher than the aluminum sheet, and the hardness being high enough to improve sliding properties and improve press-formability of the aluminum sheet, the plated coating being a zinc base alloy containing at least one of Cr, Mn, Fe, Co and Ni, the plated coating forming an exposed layer of the plated aluminum sheet.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A plated aluminum sheet having improved spot weldability which comprises an aluminum sheet having on one or both surfaces a plated coating of a metal which has a melting point of about 700°
- C. or above, the plated coating being present in a thickness sufficient to improve efficiency of spot welding of the aluminum sheet, the plated coating having a higher electric resistivity and lower thermal conductivity than the aluminum sheet, the plated coating having a hardness higher than the aluminum sheet, and the hardness being high enough to improve sliding properties and improve press-formability of the aluminum sheet, the plated coating being a zinc base alloy containing at least one of Cr, Mn, Fe, CO and Ni, the plated coating forming an exposed layer of the plated aluminum sheet, the plated coating being only on one side of the aluminum sheet and the other side of the aluminum sheet being uncoated, the aluminum sheet being bent 180° and
spot welded such that portions of the uncoated side of the aluminum sheet face each other than are spot welded together.
- C. or above, the plated coating being present in a thickness sufficient to improve efficiency of spot welding of the aluminum sheet, the plated coating having a higher electric resistivity and lower thermal conductivity than the aluminum sheet, the plated coating having a hardness higher than the aluminum sheet, and the hardness being high enough to improve sliding properties and improve press-formability of the aluminum sheet, the plated coating being a zinc base alloy containing at least one of Cr, Mn, Fe, CO and Ni, the plated coating forming an exposed layer of the plated aluminum sheet, the plated coating being only on one side of the aluminum sheet and the other side of the aluminum sheet being uncoated, the aluminum sheet being bent 180° and
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12. A plated aluminum sheet having improved spot weldability which comprises an aluminum sheet having on one or both surfaces a plated coating of a metal which has a melting point of about 700°
- C. or above, the plated coating being present in a thickness sufficient to improve efficiency of spot welding of the aluminum sheet, the plated coating having a higher electric resistivity and lower thermal conductivity than the aluminum sheet, the plated coating having a hardness higher than the aluminum sheet, and the hardness being high enough to improve sliding properties and improve press-formability of the aluminum sheet, the plated coating being a zinc base alloy containing at least one of Cr, Mn, Fe, Co and Ni, the plated coating forming an exposed layer of the plated aluminum sheet, the plated coating being on one side of the aluminum sheet and the other side of the aluminum sheet being uncoated, the uncoated side of the aluminum sheet being spot welded to an aluminum article.
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13. A plated aluminum sheet having improved spot weldability which comprises an aluminum sheet having on one or both surfaces a plated coating of a metal which has a melting point of about 700°
- C. or above, the plated coating being present in a thickness sufficient to improve efficiency of spot welding of the aluminum sheet, the plated coating having a higher electric resistivity and lower thermal conductivity than the aluminum sheet, the plated coating having a hardness higher than the aluminum sheet, and the hardness being high enough to improve sliding properties and improve press-formability of the aluminum sheet, the plated coating being a zinc base alloy containing at least one of Cr, Mn, Fe, Co and Ni, the plated coating forming an exposed layer of the plated aluminum sheet, the sheet comprising a press-formed and spot welded vehicle body panel.
Specification