FLUX-CORED WIRE FOR DIFFERENT-MATERIAL BONDING AND METHOD OF BONDING DIFFERENT MATERIALS

• US 20090017328A1
• Filed: 02/06/2007
• Published: 01/15/2009
• Est. Priority Date: 02/17/2006
• Status: Active Grant

• Current Assignee: Klaus Schmidt
• Original Assignee: Kabuskiki Kaisha KOBE Seiko Sho(Kobe-Steel Limited
• Inventors: Ido, Hidekazu, Matsumoto, Tsuyoshi, Sasabe, Seiji, Takeda, Mikako, Matsumoto, Katsushi, Katoh, Jun
• Granted Patent: US 9,682,446 B2
• Time in Patent Office: Days
• US Class Current: 428/653
• CPC Class Codes: B23K 2101/18 Sheet panels
• CPC Class Codes: B23K 2103/20 Ferrous alloys and aluminium or alloys thereof
• CPC Class Codes: B23K 35/0266 flux-cored
• CPC Class Codes: B23K 35/362 Selection of compositions of fluxes B23K35/365, B23K35/368 take precedence
• CPC Class Codes: B23K 35/406 Filled tubular wire or rods B23K35/402 takes precedence
• CPC Class Codes: B23K 9/173 and of a consumable electrode
• CPC Class Codes: B23K 9/232 of different metals
• CPC Class Codes: Y10T 428/12757 Fe

Abstract

There are provided a flux cored wire for joining dissimilar materials with each other, capable of enhancing a bonding strength upon joining an aluminum-base material with a steel-base material, and excellent in bonding efficiency, a method for joining the dissimilar materials with each other, and a bonded joint obtained by the method. In particular, there is provided a method for joining dissimilar materials with each other, in the case of melt weld-bonding of high-strength dissimilar materials with each other, that is, the high-strength steel member with the high-strength 6000 series aluminum alloy member and in the case of the steel member being a galvanized steel member. In one mode, use is made of a flux cored wire wherein the interior of an aluminum alloy envelope is filled up with a flux, the flux has fluoride composition containing a given amount of AlF₃ without containing chloride, and the aluminum alloy of the envelope contains Si in a range of 1 to 13 mass %. If such a flux cored wire is use, it is possible to obtain a high bonding strength in the case of melt weld-bonding of high-strength dissimilar materials with each other, that is, the high-strength steel member with the high-strength 6000 series aluminum alloy member.

Claims

1. :

A flux cored wire for joining dissimilar materials together, comprising;

a flux used for joining of dissimilar materials including an aluminum member or an aluminum alloy member and a steel member, with each other; and

an aluminum alloy envelope, the interior thereof being filled up with the flux, wherein the flux has fluoride composition containing aluminum fluoride.

2. :

The flux cored wire for joining dissimilar materials together, according to claim 1, wherein the flux has fluoride composition containing aluminum fluoride in a range of 0.4 to 15 mss % against the total mass of the flux cored wire without containing chloride, and the flux in a range of 0.3 to 20 mss % against the total mass of the flux cored is filled in.

3. :

The flux cored wire for joining dissimilar materials together, according to claim 1, wherein an aluminum alloy of the envelope contains Si in a range of 1 to 13 mass %, the balance being composed of Al and unavoidable impurities.

4. :

The flux cored wire for joining dissimilar materials together, according to claim 3, wherein the aluminum alloy of the envelope further contains Mn in a range of 0.1 to 0.3 mass %.

5. :

The flux cored wire for joining dissimilar materials together, according to claim 1, wherein the steel member is a galvanized steel member.

6. :

The flux cored wire for joining dissimilar materials together, according to claim 1, wherein the joining of the dissimilar materials is joining of a high tensile steel member with a 6000 series aluminum alloy member.

7. :

A method for joining dissimilar materials together comprising;

a step of melt-welding the dissimilar materials including a high tensile steel member and a 6000 series aluminum alloy member, with each other, by use of the flux cored wire according to claim 1.

8. :

A method for joining dissimilar materials together comprising;

a step of an AC-MIG welding for directly joining an aluminum member or an aluminum alloy member with a steel member by use of a flux cored wire wherein a flux containing potassium fluoride, aluminum fluoride, and at least one fluoride selected from the group consisting of fluorides of elements of the Group IIA of the Periodic Table is coated with aluminum or an aluminum alloy.

10. :

A bonded joint wherein an aluminum member or an aluminum alloy member is joined with a steel member by the method for joining dissimilar materials together, according to claim 8.

13. :

The method for joining dissimilar materials together, according to claim 8, wherein the steel member is a galvanized steel member.

9. :

A method for joining dissimilar materials together comprising;

a step of an AC-MIG welding for directly joining an aluminum member or an aluminum alloy member with a steel member by use of a flux cored wire formed by coating a flux containing potassium fluoride, aluminum fluoride, and at least one fluoride selected from the group consisting of magnesium fluoride, calcium fluoride, strontium fluoride, and barium fluoride with aluminum or an aluminum alloy, as a filler metal.

11. A method for joining dissimilar materials together comprising:

a step of joining an aluminum member or an aluminum alloy member with a steel member by either an AC-MIG welding or a MIG welding by DC reversed polarity with the use of a flux cored wire, wherein the flux cored wire is formed by filling up the interior of an envelope made up of an aluminum member or an aluminum alloy member with a flux, the flux for filling up is mixed with aluminum fluoride, and potassium fluoride to be turned into a mixed flux, and a loading weight of the mixed flux is in a range of 0.1 to 24 mass %, against the total mass of the flux cored wire.

12. :

The method for joining dissimilar materials together, according to claim 11, wherein the mixed flux has a melting point in a range of 560 to 700°

C., and the flux cored wire is not more than 1.6 mm Φ

in diameter.