US 11,938,572 B2
Method for low heat input welding on oil and gas tubulars
Austin J. Wells, Houston, TX (US)
Assigned to ATT Technology, Ltd.
Filed by ATT Technology, Ltd., Houston, TX (US)
Filed on Feb. 28, 2020, as Appl. No. 16/805,088.
Claims priority of provisional application 62/932,818, filed on Nov. 8, 2019.
Prior Publication US 2021/0138570 A1, May 13, 2021
Int. Cl. B23K 9/04 (2006.01); B23K 1/00 (2006.01); B23K 1/20 (2006.01); B23K 3/047 (2006.01); B23K 3/08 (2006.01); B23K 20/24 (2006.01); B23K 101/10 (2006.01)
CPC B23K 9/048 (2013.01) [B23K 1/0008 (2013.01); B23K 1/20 (2013.01); B23K 3/047 (2013.01); B23K 3/085 (2013.01); B23K 3/087 (2013.01); B23K 20/24 (2013.01); B23K 2101/10 (2018.08)] 3 Claims
OG exemplary drawing
 
1. A method comprising:
applying at least one layer of a buildup material to a first taper and a first part of a tube body of a workstring tubing joint using cold metal transfer, wherein the first taper is connected to the tube body on a first side of the first taper and to a workstring tubing upset connection on a second side of the first taper, wherein the first taper has a first side outer diameter that is the same as an outer diameter of the tube body and a second side outer diameter that is the same as an outer diameter of a workstring tubing upset connection, and wherein the buildup material is selected to have a welded hardness within 10 HRC of a hardness of the workstring tubing joint; and wherein the applied at least one layer of buildup material increases the first side outer diameter of the first taper until said first side outer diameter exceeds the second side outer diameter;
grinding or machining the at least one layer of buildup material until the outer diameter of the first taper matches the outer diameter of the workstring tubing upset connection; and
forming a second taper with its own first side on the first part of the tube body.