A method of laser welding a recliner assembly includes positioning a first component of a vehicle seat recliner mechanism with respect to a second component of the vehicle seat recliner mechanism. The method further includes retaining a position of the first component and the second component. Retaining includes forming a plurality of tack welds between the first component and the second component. The method further includes fixing the first component to the second component. Fixing includes forming a finishing weld between the first component and the second component by laser welding the first component to the second component.

A method of laser welding a recliner assembly includes positioning a first component of a vehicle seat recliner mechanism with respect to a second component of the vehicle seat recliner mechanism. The method further includes retaining a position of the first component and the second component. Retaining includes forming a plurality of tack welds between the first component and the second component. The method further includes fixing the first component to the second component. Fixing includes forming a finishing weld between the first component and the second component by laser welding the first component to the second component.

An article is produced by welding a first piece to a second piece by a laser beam. The first piece includes an open cavity and a first sealing surface. The second piece has a second sealing surface. The first piece and second piece are inside chamber with a controllable internal pressure that is changed to cause a flow of a gas from the open cavity. The open cavity is closed by moving at least one of the pieces. The first sealing surface forms a partially gas tight preliminary joint with the second sealing surface. The first piece and the second piece define an interface. The chamber is opened after the preliminary joint has been formed. A welded seam is formed by focusing a laser beam to the interface after the chamber is opened. The first sealing surface and the second sealing surface are substantially planar.

An article is produced by welding a first piece to a second piece by a laser beam. The first piece includes an open cavity and a first sealing surface. The second piece has a second sealing surface. The first piece and second piece are inside chamber with a controllable internal pressure that is changed to cause a flow of a gas from the open cavity. The open cavity is closed by moving at least one of the pieces. The first sealing surface forms a partially gas tight preliminary joint with the second sealing surface. The first piece and the second piece define an interface. The chamber is opened after the preliminary joint has been formed. A welded seam is formed by focusing a laser beam to the interface after the chamber is opened. The first sealing surface and the second sealing surface are substantially planar.

A method of laser machining a workpiece includes the steps of: radiating a laser beam onto at least one workpiece, the laser beam having a core beam and a ring beam extending coaxially with one another, wherein the laser beam is moved over the workpiece along a pre-determined machining path, and adjusting a laser power of the core beam and/or a laser power of the ring beam as a function of a position of the laser beam on the workpiece. An associated laser machining system is also disclosed.

Provided is a laser welding apparatus configured to weld an electrode lead of at least one secondary battery of a battery module and a main bus bar configured to electrically connect a plurality of secondary batteries to each other. The laser welding apparatus includes: a laser beam emitting unit including a laser emitting element to irradiate a laser beam to the electrode lead and the main bus bar; a pressing jig including a pressing bar configured to move in a left-and-right direction such that the electrode lead is adhered to the main bus bar; and a blocking block movable to block the laser beam generated in the laser beam emitting unit from reaching the at least one secondary battery or movable to allow the generated laser beam to pass therethrough, according to a position of the pressing bar moved in the left-and-right direction.

A welding method of a battery cover plate includes performing at least two times of continuous welding along a connecting zone between a cover plate and a shell, and adjusting laser welding power, welding speeds, and defocusing amounts. Welding power of a first continuous welding is less than welding power of a second continuous welding. An amount of deformation of the shell is less than or equal to 0.6 mm after the first continuous welding, and the amount of deformation of the shell is less than or equal to 1.0 mm after the second continuous welding.

A welding method of a battery cover plate includes performing at least two times of continuous welding along a connecting zone between a cover plate and a shell, and adjusting laser welding power, welding speeds, and defocusing amounts. Welding power of a first continuous welding is less than welding power of a second continuous welding. An amount of deformation of the shell is less than or equal to 0.6 mm after the first continuous welding, and the amount of deformation of the shell is less than or equal to 1.0 mm after the second continuous welding.

A welding method of a battery cover plate includes: performing a first welding and performing a second welding. The first welding starts from an edge of one side of the cover plate, continuously welds a portion of a connecting seam between a shell and the cover plate, and ends at an edge of an opposite side. The second welding starts from an ending position of the first welding, continuously welds a remaining portion of the connecting seam, and ends at an initial position of the first welding, or, the second welding starts from the initial position of the first welding, continuously welds the remaining portion of the connecting seam, and ends at the ending position of the first welding.

A method of laser welding a steel substrate and a ductile iron substrate is disclosed along with a laser welded assembly that may be formed by practicing the disclosed method. The disclosed laser welding method involves forming a laser weld joint between the steel and ductile iron substrates. The laser weld joint includes a fusion zone comprised of austenite ferrous alloy that has a composition derived from intermixing molten portions of the steel and ductile iron substrates as part of the laser welding process. The austenite ferrous alloy that constitutes the fusion zone of the laser weld joint has a carbon content of 2 wt % or more and a nickel equivalent of 60% or more and can be achieved without preheating the steel and ductile iron substrates prior to welding or using a filler wire to introduce a foreign metal into the molten substrate material created by the laser beam.