A method of resistance spot welding a stacked assembly of dissimilar workpieces. The stack assembly includes a first workpiece formed of a first alloy, a second workpiece formed of a second alloy, and a third workpiece formed of a third alloy sandwiched between the first workpiece and the second workpiece. The third alloy includes a lower resistivity than the first alloy and a lower resistivity than the second alloy. A faying interface is defined by a portion of the first workpiece in direct contact with a portion of the second workpiece through the third workpiece. A weld nugget, a braze, or a combination of a weld nugget and a braze joins the first workpiece to the second workpiece at the faying interface. An annular ring of re-solidified molten pool of third alloy surrounds the faying interface and a region of re-solidified partially melted third alloy surrounding the annular ring.

A metal member includes a first plate, and a second plate abutting against and welded to the first plate in at least one butt portion. In the butt portion, a length from a first end to a second end of a welding boundary line between the first plate and the second plate is longer than a length of a straight line connecting the first end to the second end of the welding boundary line.

Second member 20 includes a material that is difficult to weld to first member 10. In first member 10, recess 11 is formed by press molding such that a lower surface of first member 10 opposite to second member 20 protrudes. Third member 30 is arc-welded toward at least a bottom of recess 11 via penetrating part 21 of second member 20. Second member 20 is compressed by flange 31 and first member 10 by solidification contraction of third member 30, and second member 20 is therefore fixed between flange 31 of third member 30 and first member 10.

A welding structure of a T-shape welding joint in which a second base material is welded in a T-shape to a first base material may include the first base material including a first flat portion, a second flat portion, and curved portions formed between the first flat portion and the second flat portion; the second base material in which a bent portion is formed at an end of a main body portion such that the bent portion is disposed to face the curved portions of the first base material; and a bead disposed between the curved portions of the first base material and the bent portion of the second base material.

The disclosed apparatus, systems and methods relate to the design principles for forming a welded joint between two sections of tubing or pipe. The material at the end portion of a first section of tubing to is folded inwardly to create a support surface. This support surface improves the ability to weld light gage material with traditional arc welding and it creates conditions to allow brazing to be as strong as traditional arc welding by using A shaped piece of filler material which is located at the intersection between the support surface of the first section of tubing and a side wall section of the second section of tubing. While holding together the first and second sections of tubing with the filler material, heat is applied at the intersection at a temperature and for a duration sufficient to melt the filler material and form the 3t joint.

Presented are metalworking systems for joining metallic workpieces, methods for forming and welding such workpieces, and lithium-ion battery pouch cells with anodized aluminum tabs joined via knurling and laser welding. A method for laser welding abutting sections of a workpiece or stackup of workpieces includes receiving, via a workpiece support frame, one or more metallic workpieces each with a surface having applied thereto a treatment layer. This treatment layer releases a gas during welding. A metalworking device forms a knurl pattern into the workpiece surface with the treatment layer. The knurl pattern includes a network of channels, such as one or more series of mutually parallel, rectilinear vent channels, designed to exhaust therethrough the gas released from a welded section of the treatment layer. A laser welding device thereafter welds a joint region of the surface(s) of the one or more metallic workpiece with the knurl pattern.

A welded steel part obtained by welding a first sheet with a second sheet, at least one with a coating of aluminum alloy. The welding uses a welding wire which, after melting and cooling, constitutes a weld bead connecting the first sheet to the second sheet and being part of said welded steel part. The respective peripheral edge of the first and second sheets are in a joggled edge type configuration in which the peripheral edge of the first sheet is arranged above, and on or near the upper face of an end portion of the peripheral edge of the second sheet which is extended by an inclined junction portion, at least one part of the upper face of the inclined junction portion delimits at least laterally with the edge of the peripheral edge of the first sheet a groove receiving the weld bead, the inclined joining portion extending by a welding portion in longitudinal continuity with the peripheral edge of the first sheet.

The disclosed apparatus, systems and methods relate to the design principles for forming a welded joint between two sections of tubing or pipe. The material at the end portion of a first section of tubing to is folded inwardly to create a support surface. This support surface improves the ability to weld light gage material with traditional arc welding and it creates conditions to allow brazing to be as strong as traditional arc welding by using A shaped piece of filler material which is located at the intersection between the support surface of the first section of tubing and a side wall section of the second section of tubing. While holding together the first and second sections of tubing with the filler material, heat is applied at the intersection at a temperature and for a duration sufficient to melt the filler material and form the 3t joint.

Provided is a method of welding laminated metal foils that can prevent blowholes and spatter from being formed. It is a method of welding laminated metal foils sandwiched between a pair of metal plates to the pair of metal plates. The method of welding laminated metal foils sandwiched between a pair of metal plates to the pair of metal plates includes locally pressing and crimping the laminated metal foils sandwiched between the pair of metal plates at a welding point in a laminating direction, and welding the crimped pair of metal plates and laminated metal foils at the welding point.

Method of manufacturing first structural component for or joining with second structural component by groove weld is provided. The first structural component has first surface, second surface and end portion. The component is bent at end portion to form bent portion defining convex and concave faces. First portion of bent portion is removed at convex face in form outer weld surface having first face extending from first surface, and second face connected to first face. Second portion of bent portion is removed at concave face to form inner edge surface having arcuate profile. Inner edge surface extends from second surface and connects to second face via transition portion. A portion of first face, second face, transition portion, and inner edge surface define root protrusion, having a root protrusion height, for first structural component. The root protrusion defines stress protected weld root region isolated beyond and away from root stress flow path.