A friction stir tool control method is a control method for controlling an operation of a friction stir tool by supplying a necessary drive electric current to a drive source of the tool. The control method includes obtaining a pressurizing force change ratio by comparing a set pressurizing force predefined as a pressurizing force at plunging of the tool into a workpiece with an actual pressurizing force occurring at actual plunging of the tool into the workpiece by supplying a drive electric current for generating the set pressurizing force to the drive source. The drive electric current is regulated in accordance with the pressurizing force change ratio so that the actual pressurizing force comes to the set pressurizing force, and the drive source is driven with the regulated drive electric current.

A workpiece for use with a flash producing welding process comprises a revolute body, a plurality of first attachment portions, a plurality of second attachment portions. The revolute body has an axis of rotation.

Each of the first attachment portions has a first radially outer weld joint surface, and each of the second attachment portions has a second radially outer weld joint surface. The revolute body comprises a plurality of first and second stub portions, with each of the first stub portions having a first radially inner weld joint surface, and each of the second stub portions having a second radially inner weld joint surface.

The present invention provides a joining method including: a butting step in which a rear face of a first metal member having a recessed groove on its front face is butted against an end face of a second metal member to form a butted portion; and a friction stir step in which a stirring pin of a rotary tool is inserted in the recessed groove so as to be relatively moved therealong for joining the butted portion by friction stir. The diameter of the shoulder portion is set to be smaller than a width of the recessed groove, and in the friction stir step, the butted portion is joined by friction stir in a state that the shoulder portion is spaced from a bottom face of the recessed groove while the shoulder portion holds burrs generated from the first metal member.

A device for direct screwing, in particular flow hole screwing, or friction welding includes a guide element extending in an axial direction and being formed in particular as a guide pipe. A driveshaft is movable in the axial direction, disposed within the guide element and driven by a rotary drive. A feed drive is disposed and constructed to generate a feed movement and feed force transmitted to the driveshaft, which is achieved by a feed unit. During the process, depending on a process parameter, a switchover is made from a high feed force to a reduced feed force (flow hole screwing) or to a higher feed force (friction welding). In order to enable the most compact and weight-saving embodiment possible, the feed unit is disposed coaxially to the driveshaft within the guide element and transmits the feed force to the driveshaft in the axial direction and centrally.

Embodiments can include a self-reacting friction stir weld (FSW) tool. The device can be configured to be portable and produce full penetration welds in situ. The FSW tool can include a system that cuts out a portion of the structure surrounding a defective portion of the structure. A work-piece can be inserted within the removed portion and friction stir welded to the structure via the FSW tool. A superior repair as compared to merely welding the defect can be achieved by replacing a portion of the structure surrounding the defect as opposed to merely welding the defect (e.g., the crack). A controlled geometric shaped weld beam can be generated for the interface between the work-piece and the structure, which may led to a stronger, more reliable weld.

The friction stir welding apparatus includes a pin (20) on which a soft nitrided layer (50) is formed. The soft nitrided layer (50) is formed of an iron lithium oxide layer (51) and a nitrided diffusion layer (52). The atom of the iron lithium oxide layer (51) penetrates into a space between atoms at the surface of the pin (20) to form the nitrided diffusion layer (52).

A friction stir welding apparatus includes: a rotating shaft, on which a thread for friction stirring is formed; and a drive unit rotatably supporting the rotating shaft. A rotating shoulder configured to rotate together with the rotating shaft to generate frictional heat between the rotating shoulder and back surfaces of workpieces is fixed to a distal end of the rotating shaft. The rotating shoulder is pushed against the back surfaces of the workpieces by a pushing mechanism. A stationary shoulder penetrated by the rotating shaft and configured to hold the workpieces in a sandwiching manner together with the rotating shoulder is non-rotatably mounted to the drive unit or a member connected to the drive unit.

A method and a device for improving the quality of the weld seam in friction stir welding is provided. The process of friction stir welding is effected by means of a friction welding tip, in which a spiral conveyor screw is provided in the spindle bearing. The longitudinal axis of the spindle bearing is inclined at an angle to the vertical. The sliding surface of the rotating spindle consists of a flat sliding surface and, for the welding of curved seams, in each case of a sliding surface inclined at an acute angle to the sliding surface, the friction welding tip is designed in the shape of a truncated cone. The lateral surface of the truncated cone is formed by six trapezoidal planar parts, of which three planar parts each uniformly distributed at the circumference lie at an angle of 120 degrees with respect to one another and account for a proportion greater than at the circumference.

A joining method for forming a joint structure of different materials includes steps of: providing a steel member and a light metal member stacked on each other and to be joined together by friction stir welding in a non-melted state; applying a coating to the steel member; and joining the steel member and the light metal member together by rotatingly pushing a rotation tool into a joint portion of the light metal member with the steel member, generating friction heat and having the joint portion of the light metal member softened and plastically flow under the friction heat.

Methods, systems, and apparatuses for component manufacturing are provided. A component may be manufactured via an extrusion of loose substrate material into a unitary tubing. Features may be added to the tubing via friction stir additive manufacturing to manufacture a component. In this manner, a component may be manufactured from titanium alloys while processing challenges such as iron segregation or material loss through machining are ameliorated. Such a component may replace steel or other high strength components and further exhibits corrosion resistance.