Field girth welding technology for high manganese steel slurry pipelines
The present disclosure relates to a welding composition for joining high manganese steel base metals and methods of applying the same. The composition includes: carbon in a range of about 0.4 wt % to about 0.8 wt %; manganese in a range of about 18 wt % to about 24 wt %; chromium in an amount of ≤ about 6 wt %; molybdenum in an amount of ≤ about 4 wt %; nickel in an amount of ≤ about 5 wt %; silicon in an amount of about 0.4 wt % to about 1.0 wt %; sulfur in an amount of ≤ about 200 ppm; phosphorus in an amount of ≤ about 200 ppm; and a balance including iron. In an embodiment, the composition has an austenitic phase.
1. A system for providing erosion/corrosion resistant high manganese welds, the system comprising:
a consumable wire electrode for producing a weldment and comprising carbon in a range of about 0.4 wt % to about 0.8 wt %, manganese in a range of about 18 wt % to about 24 wt %, chromium in an amount of about ≤6 wt %, molybdenum in an amount of about ≤4 wt %, nickel in an amount of about ≤5 wt %, silicon in a range of about 0.4 wt % to about 1.0 wt %, sulfur in an amount of about ≤200 ppm, phosphorus in an amount of about ≤200 ppm, and a balance comprising iron; and
a pulsed gas metal arc welding power source that perform gas metal arc welding, wherein the pulsed gas metal arc welding power source produces a welding heat input no more than about 2.5 kJ/mm, has a background current of about 75 amps to about 150 amps, and has pulse current magnitudes from about 350 amps to about 450 amps.
2. The system of claim 1 , wherein the welding heat input is in a range of about 0.6 to about 1.0 kJ/mm.
3. The system of claim 1 , further comprising an apparatus for providing at least one shielding gas.
4. The system of claim 3 , wherein the at least one shielding gas includes CO 2 in a range of about 10% to 30%.
5. The system of claim 3 , wherein the at least one shielding gas comprises about 80% Argon and about 20% CO 2 .
6. The system of claim 1 , wherein the consumable wire electrode further comprises titanium in an amount of about ≤2 wt %.
7. The system of claim 1 , wherein the consumable wire electrode further comprises niobium in an amount of about ≤5 wt %.
8. The system of claim 1 , wherein the consumable wire electrode a microstructure comprising austenite grains.
9. The system of claim 1 , wherein the consumable wire electrode comprises carbon in the range of about 0.5 wt % to about 0.7 wt %, manganese in the range of about 19 wt % to about 23 wt %, chromium in a range of about 1 wt % to about 4 wt %, molybdenum in a range of about 1 wt % to about 3 wt %, nickel in a range of about 1 wt % to about 4 wt %, silicon in the range of about 0.4 wt % to about 0.6 wt %, sulfur in the amount of about ≤200 ppm, phosphorus in the amount of about ≤200 ppm, and the balance comprising iron.
10. The system of claim 1 , wherein the consumable wire electrode further comprises titanium in an amount of about 1 wt % to about 2 wt %.