SYSTEMS AND METHODS FOR LOW-MANGANESE WELDING ALLOYS

Abstract

Systems and methods for low-manganese welding alloys are disclosed. An example arc welding consumable may comprise: between 0.4 and 1.0 wt% manganese; strengthening agents selected from the group consisting of nickel, cobalt, copper, carbon, molybdenum, chromium, vanadium, silicon, and boron; and grain control agents selected from the group consisting of niobium, tantalum, titanium, zirconium, and boron. The grain control agents may comprise greater than 0.06 wt% and less than 0.6 wt% of the welding consumable. The resulting weld deposit may comprise a tensile strength greater than or equal to 70 ksi, a yield strength greater than or equal to 58 ksi, a ductility (as measured by percent elongation) of at least 22%, and a Charpy V-notch toughness greater than or equal to 20 ft-lbs at -20° F. The welding consumable may provide a manganese fume generation rate less than 0.01 grams per minute during the arc welding operation.

Description

Claims

1. An arc welding consumable that forms a weld deposit on a steel workpiece during an arc welding operation, wherein the welding consumable comprises: between 0.4 and 2.0 wt% manganese;strengthening agents selected from the group consisting of nickel, cobalt, copper, carbon, molybdenum, chromium, vanadium, silicon, and boron, where the strengthening agents include: between 0.001 wt% and 1.0 wt% molybdenum; andgrain control agents selected from the group consisting of niobium, tantalum, titanium, zirconium, and boron, wherein the grain control agents comprise greater than 0.06 wt% and less than 0.6 wt% of the welding consumable, wherein the weld deposit comprises a tensile strength greater than or equal to 70 ksi, a yield strength greater than or equal to 58 ksi, a ductility, as measured by percent elongation, that is at least 22%, and a Charpy V-notch toughness greater than or equal to 20 ft-lbs at -20° F.

2. The welding consumable of claim 1, wherein the manganese fume generation rate is less than 0.01 grams per minute during the arc welding operation.

3. (canceled)

4. The welding consumable of claim 1, wherein the manganese fume generation rate is between 0.0025 grams per minute and 0.0065 grams per minute when a rate of advancement of the welding consumable toward a workpiece is less than 700 inches per minute, or when a welding current is less than 425 amps, or both, during the arc welding operation.

5. The welding consumable of claim 1, wherein the welding consumable comprises a solid welding wire, a filler rod, or a stick electrode, and wherein the arc welding operation comprises a gas metal arc welding (GMAW) operation, a submerged arc welding (SAW) operation, a shielded metal arc welding (SMAW) operation, or a gas tungsten arc welding (GTAW) operation.

6. The welding consumable of claim 1, wherein the welding consumable comprises between 0.4 wt% and 0.5 wt% manganese.

7. The welding consumable of claim 1, wherein the strengthening agents comprise copper, and wherein the welding consumable comprises between 0.001 wt% and 2 wt% copper.

8. The welding consumable of claim 1, wherein the strengthening agents comprise carbon, and wherein the welding consumable comprises between 0.001 wt% and 0.12 wt% carbon.

9. The welding consumable of claim 1, wherein the strengthening agents comprise chromium, and wherein the welding consumable comprises between 0.001 wt% and 0.8 wt% chromium.

10. The welding consumable of claim 1, wherein the grain control agents comprise titanium, and wherein the welding consumable comprises between 0.01 wt% and 0.2 wt% titanium.

11. The welding consumable of claim 1, wherein the grain control agents comprise zirconium, and wherein the welding consumable comprises between 0.01 wt% and 0.2 wt% zirconium.

12. The welding consumable of claim 1, wherein the strengthening agents and the one or more grain control agents comprise boron, and wherein the welding consumable comprises between 0.0001 wt% and 0.01 wt% boron.

13. The welding consumable of claim 1, wherein the welding consumable has a carbon equivalence (CE) of between 0.07 and 0.2 as determined according to Ito and Bessyo’s method.

14. The welding consumable of claim 1, wherein the welding consumable comprises a metal sheath and a granular core.

15. The welding consumable of claim 1, wherein the welding consumable is a solid wire.

16. The welding consumable of claim 1, wherein the manganese fume generation rate is less than 0.01 grams per minute during the arc welding operation.

17. The welding consumable of claim 1, wherein the strengthening agents comprise nickel, and wherein the welding consumable comprises between 0.65 wt% and 0.85 wt% nickel.

18. The welding consumable of claim 1, wherein the strengthening agents comprise cobalt, and wherein the welding consumable comprises between 0.05 wt% and 0.7 wt% cobalt.

19. The welding consumable of claim 1, wherein the strengthening agents comprise vanadium, and wherein the welding consumable comprises between 0.001 wt% and 0.025 wt% vanadium.

20. The welding consumable of claim 1, wherein the strengthening agents include between 0.1 and 1.2 wt% silicon.

21. The welding consumable of claim 1, wherein the welding consumable comprises between 0.4 wt% and 1.0 wt% manganese.