61 results about "Friction stud welding" patented technology

A method of performing friction stir welding is provided herein. More specifically, traditional friction stir welding requires a rotatable head that is forced against a plurality of work pieces to bond the same. The rotational and normal forces generated by the friction stir welding tool are generally reacted by a backing plate, anvil, mandrel or other mechanisms, such hardware are subject to the applied forces and are often supported with additional internal supports. Conversely, a method of performing a friction stir weld is described that omits the need for such a backing member and internal supports as it is performed using a self reacting pin tool.

The present invention relates to tools and methods for welding, coating, repairing, or otherwise modifying the surface of a metal substrate. More specifically, embodiments of the present invention provide self-reacting friction stir welding tools which have an internal channel that allows filler materials to be added to the weld joint or otherwise friction stir processed area. Embodiments also provide friction stir tooling having upper and lower shoulders disposed at a fixed distance from one another and connected by a fixed split-pin. The tooling can be configured for automatically dispensing varying amounts of filler material into the tooling in response to variations in thickness of a substrate being processed.

The invention discloses a composite welding method which can realize the high welding speed and the high welding quality of welded plates. The welding method applies a composite welding technology combining laser with friction stir welding to the high-efficiency connection of the hard welded plates such as stainless steel, solving the problem of friction stir welding high-efficiency connection of the hard welded plates. The method mainly comprises the following steps that on a welded plate to be welded, the plate thickness of the welded plate is 20 to 50mm; a first laser beam is arranged on the back of the welded plate, and a second laser beam and a friction stir head are arranged on the front of the welded plate; and the first laser beam, the friction stir head and the second laser beam are sequentially arranged along a welding direction.

In a Friction Stir Welding process a load, applied through a rotating tool, frictionally heats, plasticizes and commingles selected regions of the workpieces while translating along the length of the joint. The load is supported by an anvil. The applied load inhibits relative motion of the workpiece and conventional anvils due to friction which requires application of higher translation forces and could lead to undesired surface blemishes. Thus conventional practice is to employ bulky, stationary anvils. Compact, moveable anvils comprising freely-rotating or freely moving elements in contact with the workpieces and capable of reducing workpiece-anvil friction are described. Particular benefits of this anvil design are illustrated for the process of assembling inner and outer sheet metal components into an automobile assembly, a portion of which is visible to a vehicle customer.

The invention provides a method for connecting a metal material with a resin matrix composite material via friction stir welding. The method adopts the principle that friction heat and pressure are provided by a friction stir welding device, and the connection between the metal material and the resin composite material is directly realized. Concretely, the method comprises the following steps: overlaying a metal material plate on resin, and performing fixation through a jig; then setting a technological parameter of friction stir welding, inputting an operation command through a numerical control machine tool, and automatically accomplishing overlap welding of shapes, such as dots, lines and rings; performing sufficient cooling after welding accomplishment, so as to obtain a metal material/resin material connecting piece. The technology has the advantages that the direct connection between metal and the resin material is realized, the combination speed is high, the strength is high, automatic connection of dots, lines, planes and three-dimensional shapes can be realized, the method can be widely applied to practical production processes of automobiles, trains and airplanes, and the purposes of light weight of products and energy conservation and environment protection are realized.

The invention relates to a stirring head for friction stir welding used for welding parts with different thicknesses and a welding method. A cutting accessory shaft shoulder is added on the basis of the existing stirring head, and the accessory shaft shoulder plays a role in cutting and removing the redundant material on the thicker side of connectors having different thicknesses to acquire a flat friction stir welding joint. The method is carried out on common friction stir welding equipment, a nose or tool of the equipment is not transformed at all, then the requirements on the equipment and the welding method are greatly simplified; in addition, in the welding process, a shaft shoulder of the stirring head and the two side surfaces of the part are parallel, so that the phenomena that metal of the connector is insufficiently extruded or damaged by shearing are not caused, the integrity and the reliability of the part are guaranteed; moreover, the accessory cutting shaft shoulder of the stirring head also plays an important role as for the part whose thickness suddenly changes, and the smooth welding process of the part is guaranteed.

A method and apparatus is disclosed for forming a friction stir weld joint using a friction stir tool. A first metallic work material and a second metallic work material are provided and are substantially abutted to define a joint interface having a weld surface. A quantity of metallic donor material is provided and deposited into a depression formed in the weld surface along the joint interface. A friction stir welding tool having a shoulder and a pin depending from the shoulder is provided and applied against the donor material within the depression using a plunge force. The friction stir welding tool is rotated such that the pin contacts the donor material and heats the donor material to plasticize at least a portion of the donor material forming a friction stir weld joint. The friction stir welding tool is then urged along the joint interface.

The invention discloses a steel stud and thick aluminum plate frictional stud welding method, which is characterized in that the welding end part of a steel stud is subjected to certain structural design, the steel stud is rotated, is applied with frictional acting force, and is contacted and rubbed with an aluminum plate, and the steel stud is slowly embedded into the thick aluminum plate. Double characteristics of frictional stud welding and threaded connection are realized, so that a welded joint with good performance is manufactured. By the method, steel studs with middle and small diameters are welded with thick aluminum plates. According to the method, the welding strength of the stud welding can be obviously improved, the influence of defects in common welding on the joint quality is reduced, and the service life is greatly prolonged.

A friction stir welding system is provided herein. More specifically, traditional friction stir welding requires a rotatable head that is forced against a plurality of work pieces to bond the same. The rotational and normal forces generated by the friction stir welding tool are generally reacted by a backing plate, anvil, mandrel or other mechanisms, such hardware are subject to the applied forces and are often supported with additional internal supports. Conversely, a friction stir weld system is described that omits the need for such a backing member and internal supports as it is performed using a self reacting pin tool.

The invention discloses a keyhole repairing welding method for friction stir welding of a thick plate aluminum alloy. The method is characterized by comprising the following steps of: filling a filling plug which is made of the same material as a mother plate into a keyhole position, wherein the shape and size of the filling plug are matched with those of the keyhole; and after filling, performing secondary repairing welding with a friction stir welding process. Due to the adoption of the method disclosed by the invention, the problem of keyholes formed on the thick plate aluminum alloy in a friction stir welding process is solved by using the conventional conditions, the product rejection rate can be lowered greatly, and the tendency of cracks generated by melting repairing adopted for an aluminum alloy which can be thermally treated and strengthened can be eliminated effectively.

The invention provides a stirring head for friction stir welding of a fillet joint, relates to the technical field of friction stir welding, and solves technical problems in the prior art that a toolfor friction stir welding of a fillet joint is complicated in operation and small in application range. The stirring head comprises a connecting head, a shaft shoulder (13) and a stirring pin (14), wherein the shaft shoulder (13) and the stirring pin (14) are sequentially arranged below the connecting head; the shaft shoulder (13) is arranged in the way that the diameter of the shaft shoulder is gradually reduced from a connecting face with the connecting head to a direction of the stirring pin (14); and a spiral groove (131) is formed in a side surface of the shaft shoulder (13) from the connecting face with the connecting head to the direction of the stirring pin (14). The stirring head is of a simple integrated structure, and solves the problem of much assembly demand caused by use of astatic shaft shoulder stirring head; and by use of the stirring head provided by the invention, a plate to be welded does not need to be specially machined and is directly spliced into the fillet joint for welding.

A method for repairing a defect affecting a weld. A sheet of filler metal is placed on the surface of the welded part, next to the region of the defect. The sheet is locally welded to the welded part in the region of the defect using a friction stir welding tool having a retractable welding pin. The welded part and the sheet are separated such that the filler metal amalgamated with the metal of the welded part remains in position. The local welding operation includes successively performing the following: setting the welding tool into rotation and putting it under pressure; inserting the pin to a small distance from the anvil while maintaining or increasing the pressure on the shoulder of the welding tool; progressively retracting the pin while maintaining or increasing the pressure on the shoulder; and stopping the pressure on the shoulder when the retractable pin has been retracted.

The invention relates to an electric heating friction spot welding stirring head and a welding method thereof, belonging to the friction stir welding technology. The electric heating friction spot welding stirring head is characterized in that the high-temperature electric heating ring is placed on the area between the shaft shoulder of the stirring head and the clamping part, and the high-temperature electric heating ring is fixed on the host mechanism for clamping the stirring head, which is beneficial to During the welding process, the high-temperature electric heating ring and the stirring head move synchronously. The welding method of the electric heating friction spot welding stirring head is to use a high-temperature electric heating coil to heat the stirring head before the friction stir spot welding, and perform welding when the temperature of the stirring head rises above the recrystallization temperature of the material to be welded and stabilizes. The heating temperature of the high-temperature electric heating coil remains constant until the end of the welding process. Compared with the friction stir spot welded joint without heating the stirring head, the welded joint obtained by this welding process has a nearly 25% increase in tensile properties, and solves the problem of difficult friction stir welding of materials with high melting point and low plasticity.

The invention discloses a friction stir welding method for an aluminum alloy sheet having changeable thickness. The friction stir welding method comprises the following implementation steps of mounting a laser tracking instrument within a certain distance range in front of a stirring tool; monitoring the thickness of a material sheet in a real-time manner; enabling acquired data to be fed back to a friction stir welding digital control system by an information control system; enabling the acquired data to be processed by the digital control system in time, and enabling the processed data to be fed back to a friction stir welding equipment driving system in a real-time manner; and performing real-time on-line control on the split type stirring tool by the driving system, so as to realize the friction stir welding of the aluminum alloy sheet having changeable thickness. According to the friction stir welding method disclosed by the invention, the welding depth of the split type stirring tool is controlled in a real-time manner, so that defects of being lack of through welding or damages generated by the stirring tool and the base plate which are liable to generate during the process of the friction stir welding method for the aluminum alloy sheet having changeable thickness can be effectively avoided.

The invention proposes a lateral extrusion tool used for stirring friction butt welding of a plate. The tool comprises a threaded bottom plate, a welding compaction structure, fasteners and a backboard. The tool has the technical key points that the welding compaction structure is arranged on the upper sides of an extrusion block and a welded plate; a lateral compaction structure and the welding compaction structure are used for compacting the threaded bottom plate through the fasteners; and each of the lateral compaction structure and the welding compaction structure is provided with a long strip hole matched with the corresponding fastener. The tool is simple in structure, easy to mount and wide in applicability, and can adapt to effective clamping and limiting of relatively wide and thick welded plates, enable a butting surface to be always in a close-fit state and ensure that a high-quality stirring friction butt weld joint with stable performance is formed. Due to the addition of lateral extrusion force, the demand on surface compaction force of the welded plate can be relieved, and through the combined use of the backboard, the pressing marks of the welded plate can be reduced and even completely prevented.

The invention discloses a method and equipment for underwater welding of a sacrificial anode based on friction stud welding, which are mainly used for replacement and maintenance of submarine pipelines and underwater structures of ocean engineering. The underwater welding of the sacrificial anode based on friction stud welding can be completed by a submariner or an ROV (remote operated vehicle). The friction welding is the fixed-phase welding type, and the influence on the welding process by the environment pressure is relatively small. In addition, when a deeper water area cannot be reached by the common submarine method, the welding at the water area with depth of several hundreds of meters to several thousands of meters can be performed by the ROV. The method has the advantages that the operation cost is relatively lower, the operation is simple, and a welding joint with high quality can be obtained.

The invention provides a compound robot heat source welding system by double methods of friction stud and friction stir. The system comprises an actuation mechanism and a control system, wherein the actuation mechanism includes robot arms and a welding machine head; and the welding machine head includes a bearing frame, a main shaft motor, an automatic fixture device, an electromagnetic pressing device and an inductive heating device. The system integrates friction stir with friction stud welding, facilitates to promote welding efficiency and welding quality, saves the equipment cost, and can realize welding of a stud with a larger diameter through selecting the inductive heating device to heat and the electromagnetic pressing device to apply pressure. A control system is used for controlling actions of all procedures of the welding system to realize the welding process and the function switching automation; and a hydraulic revolving oil cylinder is used for controlling a spring chuck to automatically clamp and loosen the stud and a stirring needle so as to completely realize automatic welding.

A method for friction welding of inter alia coarse grain superalloy components, involving conditioning a shear zone of components to be welded by; a) pre-determining temperature profile for which the material of the shear zone of the components approaches viscoplasticity but does not undergo undesirable phase transformations, b) introducing friction at one or both surfaces of the components to be welded to provide a pre-defined quantum of energy sufficient to generate a peak temperature of the temperature profile at that surface whilst simultaneously applying pressure to the surfaces which is below a pressure which will cause upset at the surface, c) withdrawing the friction and/or pressure allowing the heat to disperse by conduction through the shear zone; d) after the temperature at the surface falls below peak temperature, repeating steps b) and c); and repeating step d) as necessary until the pre-determined temperature gradient is achieved throughout the shear zone.

The invention relates to a rotary welding tool for friction welding and a welding method, which achieve welding by friction of a rotary welding tool on the surface of a workpiece. The welding tool forrealizing the friction welding method consists of a core material and a support body. The core material is a consumable material and is composed of a cylinder or a prism made of the same material asa to-be-welded material. One end of the support body is sleeve-shaped and is in close fit with the core material; and the other end is a common knife handle connected with a motor spindle. The supportbody is a non-consumable part, and the material strength of the support body is higher than that of to-be-welded materials. Compared with common linear friction welding and rotary friction welding, butt joint, lap joint and spot welding of plates can be welded through mutual friction of homogeneous materials, and the friction welding method is not limited to workpieces with specific section shapes any more. Compared with common friction stir welding, a non-consumable stirring tool is not needed to serve as a welding tool any more, and the problem that a stirring head is prone to abrasion andbreakage is fundamentally solved.

The invention discloses a method and device to reduce residual stress of boards during friction stir welding. The method and the device to reduce residual stress of the boards during friction stir welding have the characteristics that a plurality of heat source points are arranged at the position, corresponding to a welding seam, on a base plate for friction stir welding, the heat source points use a high-frequency induction coil to heat to produce energy and make the heat source produced by the heat source points match with the heat energy produced in the process of friction stir welding; the heat energy is maintained until the whole process of welding ends, and a temperature gradient between the stirring head welding area and the welded area is reduce; and the heat quantity produced by the heat source is controlled to keep the welding boards warm so that mechanical residual stress in the joint can be eliminated and residual stress in the welding joint can be reduced or eliminated. According to the method and device to reduce residual stress of the boards during friction stir welding, residual stress in FSW joints can be reduced or eliminated effectively, the quality and the production efficiency of the FSW joints of the boards can be improved, and the cost of production can be reduced.

The invention provides a welding method for reducing overlapping joint defects of friction stir welding, and belongs to the technical field of friction stir welding. The welding method comprises the following steps of (1) measuring geometric parameters of a to-be-welded workpiece and a mixing head; (2) fixing the to-be-welded workpiece; (3) determining a welding position; and (4) performing friction stir welding. The welding method is used for performing the friction stir welding on an overlapping structure. According to the method, the overlapping abutted surface of the overlapping structureis used as the retreating side of the friction stir welding, and the other side is used as the advancing side. A conical mixing needle is offset on the advancing side, and a high welding heat input mode is matched, so that an oxidation film on the overlapping abutted surface of the overlapping structure is prevented from entering a mixing area, on the premise that hooked defects are prevented fromforming on the advancing side, cold overlapping defects generated in the mixing area of the retreating side are reduced, and the purpose of increasing the quality of the welded joint is achieved.