A method for manufacturing a liquid-cooling jacket (1) where heat transfer fluid flows in a hollow part (14) defined by a jacket body (2) and a sealing body (3) includes: an overlapping process in which the sealing body (3) is placed on an end surface (11a) of a peripheral wall part (11) in such a way that the end surface (11a) and a back surface of the sealing body (3) are overlapped each other to form a first overlapped part (H1); and a primary joining process in which primary joining is performed by friction stirring in such a way that a rotary tool (FD) is moved once around a recessed part (13) along the first overlapped part (H1). In the primary joining process, in a state where a base side pin of the rotary tool (FD) is in contact with the sealing body (3), a flat surface of the base (tip) side pin is brought in contact with only the sealing body (3), and a tip of a projection projecting from the flat surface is inserted more deeply than the first overlapped part (H1) to join the first overlapped part (H1).

A method of forming a stamped part includes forming a tailor welded blank by friction stir welding (FSW) a first blank to a second blank, removing a FSW start spot and a FSW stop spot from the tailor welded blank using a machining process such that a finished tailor welded blank is formed and stamping the finished tailor welded blank into the stamped part such that a weld formed by FSW the first blank to the second blank is plastically deformed. The first blank and the second blank can be aluminum alloy blanks and a predetermined amount of material is machined from the FSW start spot and the FSW stop spot, the predetermined amount of material being equal to or greater than a thickness of the first blank and the second blank.

In some implementations, an apparatus comprises a pipe, a stud that is forge-welded to the pipe, creating a forge-welded stud, a bracket that is operably coupled to the forge-welded stud, and a ladder support operably coupled to the bracket.

Provided is a joining method that can prevent a plastic flowing material from flowing out from a butt section and that can reduce the thickness and weight of metal members. The joining method is for joining a first metal member and a second metal member by using a rotary tool comprising a stirring pin, and is characterized in that: the stirring pin comprises a flat surface perpendicular to the rotation axis of the rotary tool and comprises a protruding section protruding from the flat face; and in a friction stirring step, the flat surface is brought into contact with the first metal member and the second metal member, and a front end face of the protruding section is inserted deeper than an upper overlapping section to join an upper front butt section and the upper overlapping section.

A method for forming a large-diameter special-shaped cross section thin-wall tubular part. A tailor welded barrel blank is adopted as an original blank for forming of the large-diameter special-shaped cross section thin-wall tubular part. After a desired shape is formed, the original weld joint is removed and butt joint tailor welding is performed on the tubular part again. Since the tailor weld joint of the original barrel blank is removed from the final part, there is no need to consider the consistency or coordination of the microstructure of the weld joint and the base metal during the forming process and the subsequent thermal treatment process.

A connection arrangement comprising a metallic flat conductor having an at least quadrangular cross-sectional profile and at least two mutually opposing first and second surfaces extending at least partially parallel to one another in the longitudinal direction, at least two parts which are flat in the overlap region and which are formed as connecting lugs and which rest on the first surface with an overlap joint and project beyond one or both longitudinal edges of the flat conductor, characterized in that a metallic friction stir welded joint zone is formed starting from the second surface through the flat conductor towards the first surface and projecting into the connecting lugs.

The present application provides a composite brake disc, the preparation method thereof and a friction stir tool. The composite brake disc comprises: an aluminum alloy base layer, and an aluminum matrix composite layer, where the aluminum alloy base layer and the aluminum matrix composite layer are bonded with each other through metallurgical bonding. A transition layer is formed at the boundary surface where the aluminum alloy base layer and the aluminum matrix composite layer are bonded with each other. A reinforced structure connecting the aluminum alloy base layer and the aluminum matrix composite layer is formed in the transition layer. The solutions according to the present application can increase the volume fraction of reinforcement particles in the aluminum matrix composite layer, thus increasing wear resistance, can avoid further addition of ceramic particles into the aluminum alloy base layer, thus increasing the strength and elongation of the aluminum alloy base layer, reducing the failure risk, and increasing the thermal conductivity of the aluminum alloy base layer, so that the heat generated by the friction layer is transferred to the air, thus reducing the overall temperature rise of the brake disc. In addition, the aluminum matrix composite layer in the solutions plays the role of a wear-resistant layer, and a transition layer is formed between the aluminum matrix composite layer and the aluminum alloy base layer through metallurgical bonding. The transition layer can prevent the volume fraction of ceramic particles between the aluminum matrix composite layer and the aluminum alloy base layer from changing instantly, thus reducing the stress difference between the aluminum matrix composite layer and the aluminum alloy base layer due to cold and hot fatigue, and increasing the bonding force between the aluminum matrix composite layer and the aluminum alloy base layer, so as to reduce the failure risk due to cracking between the aluminum matrix composite layer and the aluminum alloy base layer as a result of cold and hot fatigue and so on.

In a double-acting friction stir spot welding device or a double-acting friction stir spot welding method, a pin member and a cylindrical shoulder member that rotates around the axis of the pin member are used as rotary tools, and a clamp member that has a cylindrical shape positioned so as to surround the outside of the shoulder member and is configured to press a workpiece from an obverse surface with an annular pressing surface of the distal end is used as a holding jig. The clamp member has an inclined surface that is adjacent to the inner edge portion of the pressing surface and inclined so as to reduce the inner diameter of the clamp member toward the back side as viewed from the pressing surface.

A method for manufacturing a liquid-cooling jacket (1) where heat transfer fluid flows in a hollow part (14) defined by a jacket body (2) and a sealing body (3) includes: an overlapping process in which the sealing body (3) is placed on an end surface (11a) of a peripheral wall part (11) in such a way that the end surface (11a) and a back surface of the sealing body (3) are overlapped each other to form a first overlapped part (H1); and a primary joining process in which primary joining is performed by friction stirring in such a way that a rotary tool (F1) is moved once around a recessed part (13) along the first overlapped part (H1). In the primary joining process, the first overlapped part (H1) is joined in a state where the tip side pin is in contact with only the sealing body (3) or with the jacket body (2) and the sealing body (3) while the base side pin is in contact with the sealing body (3).

The present invention is characterized by including a heat medium pipe insertion process to insert a heat medium pipe into a concave groove; a lid plate insertion process to insert a lid plate into a lid groove; and a joining process to perform friction stirring while a primary joining rotary tool provided with a base side pin and a tip side pin is moved along a butted portion of a side wall of the lid groove and a side face of the lid plate, wherein in the joining process, friction stirring is performed while the tip side pin of the primary rotary tool which is rotating is inserted into the butted portion and an outer circumferential face of the base side pin is in contact with the base member and the lid plate, and plastically fluidized material fluidized by frictional heat is flowed into a void portion formed adjacent to the heat medium pipe.