The invention relates to a method of producing a low-pressure compressor stator for an axial turbine engine. The stator comprises an external shroud with stubs and an annular row of stator blades extending radially towards the inside from the stubs. The method comprises the following stages: supply or production of a starting bar; bending of the bar so that it makes a circle, in order to form an unwrought external shroud; turning to form an axial annular wall delimited by annular fixing flanges; orbital friction-welding of a row of blades onto the stubs of the external shroud. The stubs are realized during a milling stage of the bar or of the external shroud, the milling being carried out before or after the bending stage. The shroud and the blades can be produced in titanium or in a thermoplastic polymer.

A vibration welding system and method having an operating vibration frequency of 260 Hz or higher. A pressing action between two workpieces is effected by directly controlling, with a control system and a sensor, the relative positions of the workpieces during some or all of the weld cycle, or by controlling the speed between the workpieces during some phase of the weld cycle and controlling the force between the workpieces during other phases. An external control device can be coupled to a control system, to produce an input signal to adjust the speed of relative motion between the workpieces, the force therebetween, or both speed and force based on the input signal. A positive force can be initially applied between the workpieces, and the weld is started by initiating lateral vibrations while the relative position between the workpieces in the pressing direction is maintained, a control variable is monitored, and the second workpiece is moved relative to the first only after the monitored variable satisfies a condition.

A method for joining two objects by anchoring an insert portion provided on one of the objects in an opening provided on the other one of the objects. The anchorage is achieved by liquefaction of a thermoplastic material and interpenetration of the liquefied material and a penetrable material, the two materials being arranged on opposite surfaces of the insert portion and the wall of the opening. Before such liquefaction and interpenetration, an interference fit is established in which such opposite surfaces are pressed against each other, and, for the anchoring, mechanical vibration energy and possibly a shearing force are applied, wherein the shearing force puts a shear stress on the interference fit.

A method for joining two objects by anchoring an insert portion provided on a first object in an opening provided on a second object. The anchorage is achieved by liquefaction of a thermoplastic material and interpenetration of the liquefied material and a penetrable material, the two materials being arranged on opposite surfaces of the insert portion and the wall of the opening. During the step of inserting the insert portion in the opening and/or during anchorage a clamping force is applied to opposing surfaces of the second object to prevent the second object from cracking or bulging.

A method of operating a linear friction welding apparatus includes holding a first work piece with a first fixture, holding a second work piece with a second fixture, pressing the first work piece toward the second work piece along a press axis with a press assembly, establishing a selective load between the first work piece and the second work piece with the press assembly while the first fixture and the second fixture are in a fixed position relative to one another, and simultaneously vibrating, with a vibrating assembly spaced apart from the press axis, the first fixture and the second fixture along a single weld axis so that both the first work piece and the second work piece are moved with respect to one another along the single weld axis after establishing the selective load.

A manufacturing method for a joined body, includes: bringing a first member and a second member into contact with each other, at least one of the first member and the second member being made of thermoplastic resin, and the second member having a recessed portion on a joining surface to be joined to the first member; and welding the first member and the second member together, including welding a contact portion of the first member and the second member by melting the thermoplastic resin by frictional heat generated in the contact portion by relative movement of the first member and the second member, in a state in which the first member and the second member are in contact with each other.

The invention relates to a vibration welding machine (1), comprising an upper tool (2) and a lower tool (3), wherein the two tools (2, 3) each accommodate a respective welding part (4, 5), which welding parts are intended to be joined by means of vibration, and means for producing vibrations are provided, which cause at least the upper tool (2) to vibrate, wherein the means for producing vibration are designed as a stationary part, in particular an upper carrier (9), and a part arranged thereon in such a way that said part can oscillate, in particular an oscillator (11), which accommodates the upper tool (2), wherein furthermore means are provided that remove the air located in an air gap (15) formed between the stationary part, in particular the upper carrier (9), and the part that can oscillate, in particular the oscillator (11).

The invention relates to a vibration welding system (10) for vibration welding two parts (50, 60) together, in particular two plastic parts (50, 60). The system (10) comprises a machine frame, a lower tooling (12) to which at least a lower part (50) is nestable, as well as an upper tooling (13) which is arranged to be brought into contact with an upper surface (65) of an upper part (60) and to vibrate with respect to the machine frame in a vibration direction (X) in order to at least partially weld a lower surface (61) of the upper part (60) to an upper surface (51) of the lower part (50). The lower tooling (12) is pivotably arranged with respect to the machine frame about a pivot axis (P). The invention further relates to a vibration welding method for vibration welding two parts (50, 60) together and to a method of upgrading an existing vibration welding system to a vibration welding system (10) according to the invention.

The present disclosure discloses a friction welding structure, wherein the friction welding structure includes a first workpiece and a second workpiece. The first workpiece includes a workpiece body and a first welding structure, and the second workpiece includes a second workpiece body and a second welding structure. Both the first welding structure and the second welding structure are positioned between the first workpiece body and the second workpiece body. The first welding structure has a first lateral mating surface, and the second welding structure has a second lateral mating surface. The first lateral mating surface abuts against and is melt-connected to the second lateral mating surface through relative movement between the first workpiece and the second workpiece. In the friction welding structure of the present disclosure, since the first lateral mating surface and the second lateral mating surface for friction, are parallel to a first direction, a tangential stress is generated between the first lateral mating surface and the second lateral mating surface when the first workpiece and the second workpiece tend to separate from each other, enabling the first workpiece and the second workpiece to be more firmly bonded.

A vibration welding device has a first tool with a vibration welding head arranged at a first support, wherein the vibration welding head vibrates in use in a first plane, and the first tool receives a first component, a second tool arranged at a second support, wherein the second tool receives a second component or a stack of welded components. The first and the second support are movable with respect to each other at least along a second axis perpendicular to the first plane from an initial position to a vibration welding position. A clamping arrangement having at least two oppositely arranged clamping devices, each having a clamping surface which is moveable along the first axis between a clamping position and open position, wherein in the clamping position, movement of the second component or the stack of welded components at least along the first axis is hindered during vibration welding.