A method of laser welding together two or more overlapping metal workpieces (12, 14, or 12, 150, 14) included in a welding region (16) of a workpiece stack-up (10) involves advancing a beam spot (44) of a laser beam (24) relative to a top surface (20) of the workpiece stack-up along a first weld path (72) in a first direction (74) to form an elongated melt puddle (76) and, then, advancing the beam spot (44) of the laser beam (24) along a second weld path (78) in a second direction (80) that is opposite of the first direction while the elongated melt puddle is still in a molten state. The first weld path and the second weld path overlap so that the beam spot of the laser beam is conveyed through the elongated melt puddle when the beam spot is advanced along the second weld path.

Disclosed are methods of forming an impact weld between different metal parts. Also disclosed herein are welded products exhibiting high strength. Also disclosed herein are systems for making such welded products.

Disclosed are methods of forming an impact weld between different metal parts. Also disclosed herein are welded products exhibiting high strength. Also disclosed herein are systems for making such welded products.

A method of acupuncture needle packaging includes inserting an acupuncture needle body of an acupuncture needle including an acupuncture needle handle at an upper portion thereof into an acupuncture needle tube starting from the acupuncture needle handle; disposing the acupuncture needle in the acupuncture needle tube in a state in which the upper portion of the acupuncture needle handle is exposed to an exterior of the acupuncture needle tube; ascending the upper portion of the acupuncture needle handle exposed to the exterior using a pressing jig; irradiating a laser to an area where the acupuncture needle tube and the acupuncture needle handle abut each other; and coupling the acupuncture needle handle and the acupuncture needle tube by thermally deforming the area where the acupuncture needle tube and the acupuncture needle handle abut each other with a heat generated by the laser.

Example illustrations are directed to methods and apparatuses comprising battery cells having weld joints. In an example method, a laser is moved to a shoulder of a battery cell. The method may further include micro welding with the laser a first line segment on the shoulder of the battery cell and moving the laser a distance on the shoulder of the battery cell. The method may also comprise micro welding with the laser a second line segment on the shoulder of the battery cell in response to moving the laser the distance. Example battery cell assemblies, e.g., for a battery pack, may have a battery cell and a weld joint on a shoulder of the battery cell. The weld joint may include a first micro weld line segment and a second micro weld line segment separated by a distance.

A battery module and a method of manufacturing the same includes: a battery cell stack including a plurality of battery cells, a bus bar frame connected to the battery cell stack, at least one electrode lead connected to the battery cell stack and containing a first metal; and a bus bar overlapping with the at least one electrode lead and containing a second metal, the at least one electrode lead and the bus bar are welded to form a welded portion, the welded portion includes a first region in which a central portion is located in the at least one electrode lead and a second region in which the central portion is located in the bus bar, and precipitates of the first metal and the second metal are distributed in both the first region and the second region.

A connection structure of laminate cells is provided. Each of the laminate cells includes a pouch including a laminate film, an electrode assembly enclosed in the pouch, and a plate-shaped terminal connected internally of the pouch to the electrode assembly and extending out of the pouch along one side edge of the pouch. The plate-shaped terminal includes a bent tip. The pouches are stacked on each other, the bent tips of the plate-shaped terminals are overlapped with each other, and the bent tips are intermittently joined together in an overlapped portion where the bent tips are overlapped with each other.

A welding structure includes: a first metal member and a second metal member that are superimposed and welded together. The first metal member has a hole. The second metal member includes a nugget portion where a part of the second metal member has been melted by heat of laser light and has re-solidified. A peripheral portion of the hole in the first metal member covers the nugget portion. A part of the nugget portion is exposed through the hole.

A welding structure includes: a first metal member and a second metal member that are superimposed and welded together. The first metal member has a hole. The second metal member includes a nugget portion where a part of the second metal member has been melted by heat of laser light and has re-solidified. A peripheral portion of the hole in the first metal member covers the nugget portion. A part of the nugget portion is exposed through the hole.

A method for producing a component by brazing and a related component are disclosed. The component may include a first part, a second part and a third part, wherein the first part includes a first junction part, the second part includes a second junction part and a cross junction part, and the third part includes a third junction part, and wherein the third junction part has a part and a remaining part. In an embodiment the method includes coupling the first part and the second part to each other by performing a preceding weld in a state of overlapping a part of the first junction part and the second junction part and, after performing the preceding weld, coupling the first part, the second part, and the third part to each other by performing a following weld.