US 12,263,542 B2
Metal carbide/nitride precipitation control in fusion welding
Frank A. Argentine, Copley, OH (US)
Assigned to BWXT Nuclear Operations Group, Inc., Lynchburg, VA (US)
Filed by BWXT Nuclear Operations Group, Inc., Lynchburg, VA (US)
Filed on Jun. 23, 2022, as Appl. No. 17/847,715.
Application 17/847,715 is a division of application No. 16/702,775, filed on Dec. 4, 2019, granted, now 11,413,710.
Application 16/702,775 is a division of application No. 15/437,901, filed on Feb. 21, 2017, granted, now 10,543,570, issued on Jan. 28, 2020.
Claims priority of provisional application 62/298,358, filed on Feb. 22, 2016.
Prior Publication US 2022/0324066 A1, Oct. 13, 2022
Int. Cl. B23K 35/00 (2006.01); B23K 9/028 (2006.01); B23K 9/167 (2006.01); B23K 9/173 (2006.01); B23K 9/23 (2006.01); B23K 35/30 (2006.01); B23K 35/38 (2006.01); C22C 19/05 (2006.01); F16B 5/08 (2006.01); B23K 103/18 (2006.01)
CPC B23K 35/304 (2013.01) [B23K 9/0286 (2013.01); B23K 9/167 (2013.01); B23K 9/173 (2013.01); B23K 9/23 (2013.01); B23K 35/383 (2013.01); C22C 19/055 (2013.01); C22C 19/056 (2013.01); C22C 19/058 (2013.01); F16B 5/08 (2013.01); B23K 2103/18 (2018.08)] 16 Claims
OG exemplary drawing
 
1. A method of fusion welding, comprising:
forming a region of molten material between a first metallic body and a second metallic body, wherein the molten material includes molten base metal from the first metallic body, molten base metal from the second metallic body, weld metal from a welding alloy, and, optionally, one or more molten additive material;
modifying at least one of a nitrogen content of the molten material and a nitride content of the molten material;
coalescing the molten material; and
solidifying the molten material to form a weld material,
wherein the weld material joins the first metallic body to the second metallic body to form a weldment, and
wherein the solidified weld material has a composition including:
Cr 18.0 to 22.0 wt. %,
Mn 2.5 to 3.5 wt. %,
Fe 1.0 to 3.0 wt. %,
Nb 2.0 to 3.0 wt. %,
N 200 ppm to 1500 ppm,
C 0.03 to 0.1 wt. %,
Ti up to 0.75 wt. %,
Si up to 0.25 wt. %, and
Ni equal to or greater than 67 wt. %.