US 11,931,817 B2
Methods for counteracting rebounding effects during solid state resistance welding of dissimilar materials
John A. Simpson, Carlsbad, CA (US); Jeffrey F. Dooley, Oceanside, CA (US); and Matthew J. Gillick, Murrieta, CA (US)
Assigned to Abbott Cardiovascular Systems, Inc., Santa Clara, CA (US)
Filed by Abbott Cardiovascular Systems, Inc., Santa Clara, CA (US)
Filed on Jul. 6, 2022, as Appl. No. 17/858,343.
Application 15/494,970 is a division of application No. 13/744,276, filed on Jan. 17, 2013, granted, now 9,636,485, issued on May 2, 2017.
Application 17/858,343 is a continuation of application No. 16/897,784, filed on Jun. 10, 2020, granted, now 11,440,127.
Application 16/897,784 is a continuation of application No. 15/494,970, filed on Apr. 24, 2017, granted, now 10,717,145, issued on Jul. 21, 2020.
Prior Publication US 2022/0331896 A1, Oct. 20, 2022
Int. Cl. B23K 11/20 (2006.01); A61M 25/09 (2006.01); B23K 11/00 (2006.01); B23K 11/04 (2006.01); B23K 101/32 (2006.01); B23K 103/02 (2006.01); B23K 103/04 (2006.01); B23K 103/14 (2006.01); B23K 103/18 (2006.01)
CPC B23K 11/20 (2013.01) [A61M 25/09 (2013.01); B23K 11/00 (2013.01); B23K 11/04 (2013.01); A61M 2025/09108 (2013.01); A61M 2025/09133 (2013.01); B23K 2101/32 (2018.08); B23K 2103/02 (2018.08); B23K 2103/05 (2018.08); B23K 2103/14 (2018.08); B23K 2103/26 (2018.08)] 20 Claims
OG exemplary drawing
 
1. A method for joining members of different metallic materials, the method comprising:
(a) providing multiple initially separate members, which members comprise different metallic materials;
(b) preparing corresponding ends of the multiple initially separate members by either flattening and/or smoothing the corresponding ends;
(c) aligning the initially separate members to result in abutting aligned members;
(d) applying a first axial baseline force to the abutting aligned members to press the abutting aligned members together, while delivering electrical current through the abutting aligned members to weld the abutting aligned members to one another; and
(e) increasing the amount of applied axial force from a value of the first axial baseline force in (d) to an increased amount of applied axial force in (e) the increased axial force being a follow up axial force that is greater than the first axial baseline force so as to produce a weld nugget having a heat affected zone where toward a center of the weld the heat affected zone comprises a first thickness across the interface of the weld that is less than a second thickness across the interface of the weld at a location towards a perimeter of the weld.