APPARATUS AND METHOD FOR DISSIMILAR WELDING OF ALLOY STEEL

• US 20110305506A1
• Filed: 06/09/2010
• Published: 12/15/2011
• Est. Priority Date: 06/09/2010
• Status: Abandoned Application

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Breitenbach, Steven Louis, Babcock, William Edward, Silvia, Alan Joseph
• Application Number:
  US12/797,130
• Publication Number:
  US 20110305506A1
• Time in Patent Office: Days
• US Class Current: 403/272
• CPC Class Codes: B23K 2103/04 Steel or steel alloys
• CPC Class Codes: B23K 2103/05 Stainless steel
• CPC Class Codes: B23K 2103/18 Dissimilar materials
• CPC Class Codes: B23K 35/308 with Cr as next major constituent
• CPC Class Codes: B23K 9/1675 making use of several electrodes
• CPC Class Codes: B23K 9/321 Protecting means protecting means in general F16P1/06

Abstract

A weld joint includes low and high alloy steel components. A weld bead between the low and high alloy steel components includes a first weld wire in contact with the low alloy steel component, a second weld wire in contact with the high alloy steel component, and a third weld wire between the first and second weld wires. The third weld wire has a higher percentage of chromium than the first weld wire and a lower percentage of chromium than the second weld wire. A method for welding includes applying a first weld wire to a low alloy steel component, applying a second weld wire to a high alloy steel component, and applying a third weld wire between the first and second weld wires. The third weld wire has a higher percentage of chromium than the first weld wire and a lower percentage of chromium than the second weld wire.

Claims

1. A weld joint, comprising:

a. a low alloy steel component, wherein the low alloy steel component comprises less than approximately 4.0% chromium by weight;

b. a high alloy steel component, wherein the high alloy steel component comprises more than approximately 9.0% chromium by weight;

c. a weld bead between the low and high alloy steel components, wherein the weld bead comprises a first weld wire in contact with the low alloy steel component, a second weld wire in contact with the high alloy steel component, and a third weld wire between the first and second weld wires; and

d. wherein the third weld wire has a higher percentage of chromium by weight than the first weld wire and a lower percentage of chromium by weight than the second weld wire.

2. The weld joint as in claim 1, wherein the low alloy steel component comprises less than approximately 2.5% chromium by weight.

3. The weld joint as in claim 1, wherein the first weld wire has a higher percentage of chromium by weight than the low alloy steel.

4. The weld joint as in claim 1, wherein the first weld wire has approximately 2-4% chromium by weight.

5. The weld joint as in claim 1, wherein the first weld wire comprises carbon, chromium, molybdenum, vanadium, and/or other elements such as tungsten.

6. The weld joint as in claim 1, wherein the second weld wire has a lower percentage of chromium by weight than the high alloy steel.

7. The weld joint as in claim 1, wherein the second weld wire has approximately 8-10% chromium by weight.

8. The weld joint as in claim 1, wherein the second weld wire comprises carbon, chromium, molybdenum, nickel, and vanadium.

9. The weld joint as in claim 1, wherein the third weld wire has approximately 5-7% chromium by weight.

10. The weld joint as in claim 1, wherein the third weld wire comprises carbon, chromium, nickel, molybdenum, and vanadium.

11. The weld joint as in claim 1, wherein the second weld wire has a higher thermal expansion coefficient value than the first weld wire.

12. A weld joint, comprising:

a. a low alloy steel component;

b. a high alloy steel component;

c. a chromium gradient between the low alloy steel component and the high alloy steel component; and

d. means for reducing the chromium gradient between the low alloy steel component and the high alloy steel component.

13. The weld joint as in claim 12, wherein the low alloy steel component has less than approximately 2.2% chromium by weight.

14. The weld joint as in claim 12, wherein the high alloy steel component has more than approximately 9% chromium by weight.

15. The weld joint as in claim 12, wherein the means for reducing the chromium gradient between the low alloy steel component and the high alloy steel component comprises a first weld wire in contact with the low alloy steel component, wherein the first weld wire has a higher percentage of chromium by weight than the low alloy steel component.

16. The weld joint as in claim 15, wherein the means for reducing the chromium gradient between the low alloy steel component and the high alloy steel component comprises a second weld wire in contact with the high alloy steel component, wherein the second weld wire has a lower percentage of chromium by weight than the high alloy steel component.

17. The weld joint as in claim 16, wherein the means for reducing the chromium gradient between the low alloy steel component and the high alloy steel component comprises a third weld wire between the first and second weld wires, wherein the third weld wire has a higher percentage of chromium by weight than the first weld wire and a lower percentage of chromium by weight than the second weld wire.

18. A method for welding, comprising:

a. applying a first weld wire to a low alloy steel component, wherein the first weld wire has a higher percentage of chromium by weight than the low alloy steel component;

b. applying a second weld wire to a high alloy steel component, wherein the second weld wire has a lower percentage of chromium by weight than the high alloy steel component;

c. applying a third weld wire between the first and second weld wires, wherein the third weld wire has a higher percentage of chromium by weight than the first weld wire and a lower percentage of chromium by weight than the second weld wire.

19. The method as in claim 18, further including applying the first weld wire directly to the low alloy steel component.

20. The method as in claim 18, further including simultaneously applying the first, second, and third weld wires.