In a battery assembly including a first battery and a second battery, the first battery includes a negative terminal, and the negative terminal has a first metal section and a second metal section formed of a metal different from the first metal section. The second metal section is joined to the top of the first metal section with the dissimilar metal joining, and the second metal section is formed with a joint surface and a recessed portion. A method of manufacturing the battery assembly includes a process of inserting a welding assist member into the recessed portion, and a process of placing a bus bar on the joint surface of the negative terminal in which the welding assist member is inserted in the recessed portion, and joining the bus bar onto the joint surface of the negative terminal by laser welding.

A friction head and a friction additive manufacturing method of adjusting components and synchronously feeding material are provided. The friction head includes a friction body, a charging part and a feeding part. An axis of the friction body, an axis of the charging part and an axis of the feeding part are coincided with one another. The charging part and the feeding part are sleeved on the friction body. Spiral groove(s) extending in a same direction is formed in an inner ring wall of the feeding part. The spiral groove(s) extends through the inner ring wall of the feeding part and is symmetrical about the axis of the feeding part. The spiral groove(s) and a lower outer surface of the feeding part form spiral feeding channel(s). An upper end of each feeding channel is communicated with a corresponding one of feeding hole(s).

The present disclosure provides a linear friction joining device which includes: a pressing device for pressing a second member onto a first member in a pressing direction; a vibrator for relatively vibrating the first member and the second member; a controller which is configured to bring the second member into contact with the first member by a position control, which depends on a measurement result of position sensors, to change the position control to a load control, which depends on a measurement result of load sensors, and to increase a pressing load toward a joining load; and a joining load reaching time adjuster which is configured to adjust a length of a joining load reaching time which is between the time when the position control is changed to the load control and the time when the pressing load reaches the joining load.

A head piece and a welding tool, in particular an FSW tool, equipped therewith, and a welding method. The head piece has a through-opening for a plasticizing welding means, in particular a rotating welding pin. The head piece also has a profiled end face which faces the workpiece during welding and has end face regions of different heights and a sloping shoulder, which conducts the plasticized material of the workpiece and connects the end face regions.

A friction stir spot welding method includes a welding step of performing friction stir spot welding of a workpiece by using a pin member and a shoulder member while the workpiece is supported and pressed by the end face of a clamp member and a pressing step of causing a friction stir spot welding device to press an obverse surface and a reverse surface of at least one of a friction-stirred region of the workpiece and an adjacent region adjacent to the friction-stirred region of the workpiece from a rotary tool side and an opposite side after the welding step while the pin member and the shoulder member are accommodated in an accommodation space of the clamp member.

A transmission shaft of a countershaft-type manual transmission is constructed from a plurality of hollow shaft portions which are butt press welded to one another, at least two of which hollow shaft portions are provided in each instance with at least one helical toothing of a fixed wheel of a spur gear stage. The hollow shaft portions provided with a helical toothing are connected to the respective adjacent hollow shaft portion in each instance so as to be rotated by a correction angle (Δα) around their center axis in proportion to a deviation (Δx) from their axial target position, wherein the ratio between the correction angle (Δα) and the axial deviation (Δx) corresponds to the pitch (s) of the helical toothing (Δα/Δx=s).

A transmission shaft of a countershaft-type manual transmission is constructed from a plurality of hollow shaft portions which are butt press welded to one another, at least two of which hollow shaft portions are provided in each instance with at least one helical toothing of a fixed wheel of a spur gear stage. The hollow shaft portions provided with a helical toothing are connected to the respective adjacent hollow shaft portion in each instance so as to be rotated by a correction angle (Δα) around their center axis in proportion to a deviation (Δx) from their axial target position, wherein the ratio between the correction angle (Δα) and the axial deviation (Δx) corresponds to the pitch (s) of the helical toothing (Δα/Δx=s).

A friction stir welding tool, which includes a pin and a shoulder rigidly connected to the pin, for welding components composed of a parent material having a melting point of more than 900° C., in particular steel. To achieve a particularly long service life of the tool even with thick-walled components, it is provided that the shoulder is at least partially composed of a first material and the pin is at least partially composed of a second material. Furthermore, the shoulder is at least partially composed of a first: material and the pin is at least partially composed of a second material. In addition, a method for joining components of one or more parent materials having a melting temperature of more than 900° C. is provided.

A tank, in particular for a liquid hydrogen reservoir, provided with at least one dome fixed by way of an outer welded joint and having a central portion provided with at least one free end including a first connecting element and at least one dome provided with an open end including a second connecting element, the dome and the central portion being able to be joined together, the first connecting element and the second connecting element being configured to form, when the central portion and the dome are joined together, a protruding tab extending toward the outside of the tank and able to be welded to a protruding end, such a protruding tab making it possible in particular to join together the tank, this being done entirely from the outside of said tank, and to easily mount and dismount the dome, in particular without accessibility issues.

The automatic joining system includes: a fixing device; a friction stir device; a measuring unit; and a controlling device, in which a rotating tool includes a base end side pin and a tip end side pin formed continuously to the base end side pin, the controlling device sets a target moving route along which the rotating tool moves when friction stir joining of a butting portion is performed, based on a ridge line position before the friction stir joining is performed, and also sets a modified moving route at a position displaced toward a first metallic member side in substantially parallel with respect to the target moving route, and the friction stir device controls the rotating tool to move along the modified moving route and thereby performing the friction stir joining along the target moving route.