Granted Patent B2

US 12,447,556 · App. 17/626,378 · Granted Oct 21, 2025

Inventors: Hans-Christian Schmale (Braunschweig, DE); Matthias Höfemann (Wolfenbüttel, DE); André Kröff (Burgdorf, DE); Joachim Schöttler (Braunschweig, DE); Manuel Maikranz-Valentin (Baunatal, DE)

Assignee: Salzgitter Europlatinen GmbH

B23K26/322B23K26/24B23K26/348B23K35/3086B32B15/012C21D1/673C21D6/002C21D6/005C21D6/008C21D9/50C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28C22C38/32C23C2/26B23K2101/006B23K2101/185B23K2101/34B23K2103/04

Abstract

Claims (113)

1. A method for producing a tailored blank from at least two blank parts, wherein at least one blank part comprises a press-hardenable manganese-boron steel, and wherein at least one blank part is provided on at least one side with a coating comprising aluminum or an aluminum-based alloy and the said method comprising:

welding the at least two blank parts by laser beam welding or laser-metal inert gas hybrid welding using inert gas and supplying a filler wire, wherein the filler wire comprises the following chemical composition in wt. %:

C: 0.41 to 0.9;

Si: 0.4 to 4;

Mn: 0.4 to 3; and

Cr: 0 to 10;

and with optional addition by alloying of one or more of the following additional elements:

Mo: 0.01 to 1.0;

B: 0.0008 to 0.0040;

Ti: 2.5×B<=Ti<=5×B;

V: 0.01 to 0.4;

Nb: 0.01 to 0.2; and

W: 0.01 to 0.2;

with the remainder being Fe and unavoidable impurities.

2. The method as claimed in claim 1 , wherein the filler wire has the following chemical composition in wt. %:

C: 0.41 to 0.9;

Si: 0.4 to 4;

Mn: 0.4 to 3; and

Cr: 2.0 to 10;

with the remainder being Fe and unavoidable impurities.

3. The method as claimed in claim 1 , wherein the filler wire has the following chemical composition in wt. %:

C: 0.41 to 0.9;

Si: 0.4 to 4;

Mn: 0.4 to 3;

Cr: 0.05 to 10;

at least one of the following additional elements:

Mo: 0.01 to 1.0, preferably 0.01 to 0.2;

B: 0.0008 to 0.0040;

Ti: 2.5×B<=Ti<=5×B;

V: 0.01 to 0.4;

Nb: 0.01 to 0.2; and

W: 0.01 to 0.2;

with the remainder being Fe and unavoidable impurities.

4. The method as claimed in claim 3 , wherein the filler wire only has one or a group of the following additional elements in wt. %:

Mo: 0.01 to 1.0; or

V: 0.01 to 0.4; or

B: 0.0008 to 0.0040 with Ti: 2.5×B<=Ti<=5×B.

5. The method as claimed in claim 1 , wherein the filler wire has the following chemical composition in wt. %:

C: 0.41 to 0.9;

Si: 0.4 to 4;

Mn: 0.4 to 3;

at least one of the following additional elements:

Mo: 0.01 to 1.0;

B: 0.0008 to 0.0040;

Ti: 2.5×B<=Ti<=5×B;

V: 0.01 to 0.4;

Nb: 0.01 to 0.2; and

W: 0.01 to 0.2;

with the remainder being Fe and unavoidable impurities.

6. The method as claimed in claim 5 , wherein the filler wire only has one or a group of the following additional elements in wt. %:

Mo: 0.01 to 1.0; or

V: 0.01 to 0.4; or

B: 0.0008 to 0.0040 with Ti: 2.5×B<=Ti<=5×B.

7. The method as claimed in claim 6 , wherein a melting bath is formed during said welding the at least two blank parts, and wherein the filler wire is supplied to the melting bath at a temperature of 5 to 40° C.

8. The method as claimed in claim 1 , wherein a melting bath is formed during said welding the at least two blank parts, and wherein the melting bath is produced exclusively by means of a laser beam or additionally with the electric arc of a laser-metal inert gas hybrid process.

9. The method as claimed in claim 1 , wherein in addition to aluminum the aluminum-based alloy of the coating contains one or more of the elements Fe, Si, Mg or Cr, or is an AlSi alloy.

10. The method as claimed in claim 1 , wherein the blank parts to be joined differ from each other or are similar in relation to material quality, thickness and/or coatings.

11. The method as claimed in claim 1 , wherein the press-hardenable manganese-boron steel is 22MnB5 or 30MnB5.

12. The method as claimed in claim 1 , wherein one of the blank parts to be joined consists of a non-press-hardenable steel.

13. The method as claimed in claim 1 , wherein said method further comprises press-hardening the tailored blank.

14. A filler wire for the laser beam welding or laser-metal inert gas hybrid welding using inert gas for the integrally bonded connection of a tailored blank comprising at least two blank parts, of which at least one blank part comprises a press-hardenable manganese-boron steel and of which at least one blank part is provided on at least one side with a coating consisting of aluminum or an aluminum-based alloy, wherein the filler wire comprises the following chemical composition in wt. %:

C: 0.41 to 0.9;

Si: 0.4 to 4;

Mn: 0.4 to 3;

Cr: 0 to 10;

and with optional addition by alloying of one or more of the following additional elements:

Mo: 0.01 to 1.0;

B: 0.0008 to 0.0040;

Ti: 2.5×B<=Ti<=5×B;

V: 0.01 to 0.4;

Nb: 0.01 to 0.2; and

W: 0.01 to 0.2;

with the remainder being Fe and unavoidable impurities.

15. The filler wire as claimed in claim 14 , wherein the filler wire has the following chemical composition in wt. %:

C: 0.41 to 0.9;

Si: 0.4 to 4;

Mn: 0.4 to 3; and

Cr: 2.0 to 10;

with the remainder being Fe and unavoidable impurities.

16. The filler wire as claimed in claim 15 , wherein the filler wire has the following chemical composition in wt. %:

C: 0.41 to 0.9;

Si: 0.4 to 4;

Mn: 0.4 to 3;

Cr: 0.05 to 10;

at least one of the following additional elements:

Mo: 0.01 to 1.0;

B: 0.0008 to 0.0040;

Ti: 2.5×B<=Ti<=5×B;

V: 0.01 to 0.4;

Nb: 0.01 to 0.2; and

W: 0.01 to 0.2;

with the remainder being Fe and unavoidable impurities.

17. The filler wire as claimed in claim 16 , wherein the filler wire only has one or a group of the following additional elements in wt. %:

Mo: 0.01 to 1.0; or

V: 0.01 to 0.4; or

B: 0.0008 to 0.0040 with Ti: 2.5×B<=Ti<=5×B.

18. The filler wire as claimed in claim 14 , wherein the filler wire has the following chemical composition in wt. %:

C: 0.41 to 0.9;

Si: 0.4 to 4;

Mn: 0.4 to 3;

at least one of the following additional elements:

Mo: 0.01 to 1.0;

B: 0.0008 to 0.0040;

Ti: 2.5×B<=Ti<=5×B;

V: 0.01 to 0.4;

Nb: 0.01 to 0.2; and

W: 0.01 to 0.2;

with the remainder being Fe and unavoidable impurities.

19. The filler wire as claimed in claim 18 , wherein the filler wire only has one or a group of the following additional elements in wt. %:

Mo: 0.01 to 1.0; or

V: 0.01 to 0.4; or

B: 0.0008 to 0.0040 with Ti: 2.5×B<=Ti<=5×B.

20. Use of a filler wire as claimed in claim 14 for a method for producing a tailored blank from at least two blank parts, of which at least one blank part consists of a press-hardenable manganese-boron steel, and of which at least one blank part is provided on at least one side with a coating consisting of aluminum or an aluminum-based alloy, wherein said method comprises connecting the at least two blank parts by laser beam welding or laser-metal inert gas hybrid welding using inert gas and supplying the filler wire.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (19)