30results about How to "Good quality joints" patented technology

The invention discloses a method for preparing a bimetal composite plate by stirring friction braze welding. The method comprises that: a plate with small hardness is used as a covering layer metal plate; a plate with high hardness is used as a base layer metal plate; the covering layer metal plate and the base layer metal plate are horizontally fixed on a working platform surface in a lap joint mode; solders which can generate eutectic reaction with one of the upper/base layer metal plates are preset between the upper/base layer metal plates; a non-needle type cylinder friction device is arranged over the covering layer metal plate; the non-needle type cylindrical friction device is made to rotate and be pressed to be closely contacted with the surface layer of the covering layer metal plate, but not penetrate the covering layer metal plate, and the non-needle type cylindrical friction device rotates in the original position or moves forward along the surface of the covering layer metal plate while rotating; by utilizing frictional heat to melt the solders, the upper/base layer metal plates are both quickly melted in the solders, thereby achieving excellent interface combination; and the excessive solders are squeezed out, and a thin and dense soldering seam is formed, so that the bimetal composite plate is prepared. Compared with the braze welding in a furnace, the method has the advantages of high efficiency, energy conservation, pressure lead-in, unnecessary soldering flux and gas protection and short holding time at a high temperature.

The invention discloses a dissimilar material composite welding method. The dissimilar material composite welding method comprises the following steps: firstly, a welding device is obtained; secondly, a to-be-welded part a and a to-be-welded part c which are each made of dissimilar materials and wholly in a columnar shape are obtained, and the dissimilar material composite welding method is characterized in that the welding device in the first step further comprises a heater; thirdly, a middle transition layer and a top pressure bar are obtained; fourthly, the middle transition layer and the to-be-welded part a are in diffusion welding; fifthly, friction pre-welding clamping is carried out; sixthly, friction pre-welding preheating is carried out; seventhly, inertia friction welding connection of a material with the middle transition layer is carried out; and eighthly, after-welding treatment is carried out. The dissimilar material composite welding method has the beneficial effects of being higher in welding efficiency and better in welding quality.

Provided is an aluminum/steel dissimilar material friction-stir lap joint method assisted by rivet type mechanical connection. The lap join method aims at solving the problems that aluminum/steel dissimilar metals are prone to reaction to generate brittle intermetallic compounds in the existing connection process of brazing or fusion welding, and the bearing area of connectors is small and the bearing capacity of the aluminum/steel dissimilar connectors is weakened in the friction-stir-welding lap joint process. The method comprises the steps that (1) a row of pre-drilled holes are drilled in the lap joint width direction B of a steel plate along the longitudinal central line; (2) contact surfaces and the peripheral areas of the steel plate and an aluminum plate are cleaned up, and oxides on the surface of the steel plate and the surface of the aluminum plate are removed; (3) the surface of the steel plate and the surface of the aluminum plate are wiped with organic solvents or cleaning agents; and (4) the aluminum plate and the steel plate are fixed through a clamp, in the friction stir welding process, a stirring head and the aluminum plate rub, softened aluminum flows downwards, and then the pre-drilled holes in the steel plate are filled, so that a rivet type connecting structure is formed, and an aluminum/steel friction-stir lap joint connector which is strengthened through mechanical connection is obtained. The method is used for friction-stir lap joint of dissimilar materials.

The invention discloses a martensite heat resistant steel electrode a 650 DEG C supercritical thermal power unit with a back side free of argon filling, single-side welding and double-side molding. Aslag series formula of CaO-CaF2-TiO2-Zr2O3 is adopted, and the main components of deposited metal comprise 9% of Cr, 3% of W and 3% of Co. The martensite heat resistant steel electrode has excellent single-side welding and double-side molding technological properties; during welding, an electrode coating can be molten for forming a layer of thin slag infiltrated into the back side of a workpiece and uniformly covering the surface of a weld joint at the back side so that the weld joint is protected from being oxidized; and slag is easy to clear. Under the heat treatment condition of 100 DEG Cx1h+780 DEG Cx3 h, the tensile strength of the deposited metal is not lower than 720 MPa, and the elongation and normal temperature impact property of the deposited metal are particularly excellent, and are not lower than 150 J; and the martensite heat resistant steel electrode is especially suitable for the priming requirements of the 650 DEG C supercritical thermal power unit with the back side free of argon filling, single-side welding and double-side molding.

The invention provides a laser auxiliary hot-pressure welding device and welding method for connecting titanium / aluminum dissimilar materials. The implementation process of the laser auxiliary hot-pressure welding device and welding method comprises the following steps that titanium alloy base metal and aluminum alloy base metal are arranged on a workbench after being connected in a lap joint mode according to the principle that the titanium alloy base metal is arranged above the aluminum alloy base metal; after a microprocessor is started, according to a preset pressure value and a preset stepping speed of the workbench, the microprocessor controls the rotation speed of a stepping motor, a pressure control valve controls the working pressure of an air cylinder, a pressure test of an idler wheel is conducted first, then pressure by the idler wheel at a welding point on the base metal is transmitted through a pressure sensor, and the air cylinder is controlled in time so as to amend the pressure value; laser beams are irradiated on a weld joint of the base metal connected in the lap joint mode, the idler wheel is used for acting on the dissimilar materials, and the dissimilar materials mutually diffuse under the pressure action so that the purpose of welding can be achieved. According to the laser auxiliary hot-pressure welding device and welding method for connecting the titanium / aluminum dissimilar materials, brittle intermetallic compounds generated when the titanium / aluminum dissimilar materials are connected can be reduced remarkably, welding of thin dissimilar metal plates is easy to realize, welding efficiency is high, welding cost is low, the quality of a connector is high because the content of the intermetallic compounds is small, the welding cost is quite low, and the quality of the connector is good.

The invention provides a method for controlling welding cracks of ultrathin tantalum and molybdenum dissimilar materials. The method comprises the following steps: (1) washing and cleaning impurities on metal surfaces of tantalum/molybdenum base materials and drying to remove water; (2) selecting a TC4 wire with a suitable diameter, putting the TC4 wire between the tantalum/molybdenum base materials and fixing the TC4 wire by using a tool clamp; (3) protecting by adopting Ar gas, firstly charging Ar gas for 3min and completely exhausting the air in a glass cover; (4) performing before-welding location at the two ends of a sample, and positioning the TC4 wire and the base materials by adopting relatively small laser power; (5) adjusting to use suitable laser power to weld the sample. The method disclosed by the invention is capable of inhibiting generation of cracks generated when an ultrahigh-temperature melting tank is quickly cooled to room temperature during welding of tantalum and molybdenum, and realizing good laser welding of the ultrathin tantalum and molybdenum dissimilar materials; a relatively good joint can be obtained when tantalum and molybdenum are welded under suitable parameters, and tensile failure on a tantalum base material is prevented. The welding method provided by the invention is low in cost, high in efficiency and good in joint quality.

The invention provides a piece assembly device used for chain assembly and relates to the field of chain production. The piece assembly device comprises a lifting device, a piece press device connected with the lower end of the lifting device, a control device, a first piece assembly cam, a sensor corresponding to the first piece assembly cam, a second piece assembly cam and a sensor corresponding to the second piece assembly cam. The lifting device is connected with the control device. The piece press device comprises a piece press mould and a pair of guide collision devices installed in the piece press mould and elastically connected with the piece press mould, and the sensors are connected with the control device. The piece assembly device has the advantages of being safe in production, high in efficiency, good in quality, high in stability and the like, thereby being a full automatic piece assembly device used for chain assembly.

The invention discloses a titanium alloy narrow-gap laser welding wire feeding and gas protection integrated mechanism. The titanium alloy narrow-gap laser welding wire feeding and gas protection integrated mechanism comprises a shell capable of extending into a to-be-welded gap, and the shell is in a hollow cuboid shape; a wire feeding channel smoothly extending from the top wall of the shell tothe lower portion of the right side wall of the shell is obliquely arranged in the shell, and the wire feeding channel can feed a welding wire to the position to be welded at the angle of 15-60 degrees relative to the horizontal plane; and the wire feeding channel divides an inner cavity of the shell into a left cavity and a right cavity which are independent of each other, the left cavity can enable gas for protecting a weld joint introduced into the left cavity to be evenly and stably blown to the weld joint in the vertical direction, and the right cavity can enable gas for protecting a molten pool introduced into the right cavity to be evenly and stably blown to the molten pool at an angle of 0-30 degrees relative to the horizontal plane. By the adoption of the mechanism, the requirements for narrow-gap laser welding alignment wire feeding and welding protection can be met; and meanwhile, plasmas generated in the welding process are effectively blown away, welding power fluctuationcaused by energy dissipation is reduced, and therefore the stability of the welding process is improved.

The invention relates to the field of welding, in particular to an impact rolling machine head for welding and a welding with trailing device. The welding with trailing device comprises an air pump and the impact rolling machine head for welding. An air inlet is formed in a housing of the impact rolling machine head for welding; an air cylinder is arranged in the housing; a piston divides the aircylinder into an upper space and a lower space; the upper end of an impact rod penetrates through the bottom wall of the air cylinder in a sliding manner and extends into the lower space; the lower end of the impact rod is connected with a rolling wheel structure; the rolling wheel structure comprises a rolling cam and a rolling concave wheel; the rolling concave wheel is positioned at the front end of the impact rolling machine head for welding in the moving direction; and the rolling cam is positioned at the rear end of the impact rolling machine head for welding in the moving direction. Thepiston in the air cylinder is pushed by the air pressure to move, a mechanical impact force is applied to weld metal in the high-temperature state, a melt in a high-temperature welding area is extruded to the middle by the rolling concave wheel, and when being cooled, the melt is transversely rolled by the rolling cam, so that the purpose of preventing welding hot cracks and delayed cold cracks generated in a welding seam area is achieved.

The invention discloses a method and a device for plastically connecting metal pipes and plates with one another, and belongs to the technical field of material connection. The device comprises a maledie, an edge pressing ring and a female die. The device and the method have the advantages that the pipes and the plates which are required to be connected with one another are prefabricated, then the pipes can be placed in the female die, the plates can be clamped by the female die and the edge pressing ring, the male die can revolve at the high speeds and can rotate along the axes of the pipesat the low speeds, and the plasticity of the pipes can be enhanced by the aid of friction effects; plastic deformation portions of the plates can be promoted by rolling of the male die to flow into annular grooves of the pipes, and accordingly the pipes and the plates can be quickly and efficiently plastically connected with one another in a green manner; the device is high in production efficiency, low in cost and suitable for mass production and is environmentally friendly; plastic forming modes are adopted by the method for connecting the metal pipes and the plates with one another by the aid of the device, the annular grooves are filled with materials for the plates, connectors are good in quality, high tensile stress can be borne, and the problem of difficulty in connecting plate metal with heterogeneous pipes difficult to weld can be solved by the aid of the method and the device.

The invention discloses a welding method for friction stud welding. The welding method for friction stud welding comprises the following steps: S1, pressing workpieces by using a pressing device and putting the workpieces in a welding box; S2, introducing protective gas into the welding box and pressing studs rotating at high speed on the surfaces of the workpieces; and S3, pressing the studs into the surfaces of the workpieces to be integrated and moving to the interiors of the workpieces at the same time, in whichwherein the range of the pressing depth is 0.1-1mm; the generated friction heat is used for enabling the studs to be integrated with the workpieces. The welding method for friction stud welding has the advantages that the welding method is relatively simple and practical, the joint welding strength can be effectively improved, the welding efficiency and the joint quality can be optimized, and the possible defects of faulty welding, cracks and air holes in the conventional stud welding can be avoided.

A titanium alloy plate welding method capable of improving welding performance comprises the following steps that S1, a Ti6Al4V titanium alloy plate with the thickness ranging from 2 mm to 4 mm is taken, a V-shaped welding groove is formed in the position to be welded, a butt joint is formed, the groove angle of the welding groove ranges from 18 degrees to 22 degrees, the width of an upper opening of the groove ranges from 0.8 mm to 1.2 mm, the groove gap ranges from 0 mm to 1 mm, and the truncated edge of the groove ranges from 0.1 mm to 0.5 mm; s2, metal particles are weighed according to the mass percent of 6wt% of Al, 4wt% of V, 0.1-0.7 wt% of Ce and the balance Ti, an alloy ingot is prepared through vacuum induction melting, and then the alloy ingot is machined into a transition layer matched with the welding groove; s3, the transition layer is placed in a welding groove of the Ti6Al4V titanium alloy plate butt joint, and a to-be-welded welding joint is formed; s4, pulse laser welding is conducted on the to-be-welded welding joint; according to the welding process parameters, the pulse frequency ranges from 20 Hz to 30 Hz, the pulse width ranges from 23 ms to 27 ms, the welding speed ranges from 22 mm/s to 28 mm/s, the laser base value power ranges from 2800 W to 3200 W, the laser peak power ranges from 3800 W to 4200 W, and the protective argon flow ranges from 12 L/min to 20 L/min. The welding method is low in cost, high in efficiency and good in joint quality, and the obtained welding seam is excellent in performance.

The invention discloses a split-type connecting pipe rotating device, which is characterized in that it includes a base, a split-type pipe mold, and a sliding clamp for locking, and the groove width of the base matches the thickness of the belt pulley; The copper pipe blank is installed in the rotating fixture, and the split pipe mold is locked with the rotating fixture. The sliding fixture is fixed on the side wall of the base and penetrates into the groove; the welding end surface of the copper pipe blank extends It can be seen that the copper tube blank and the aluminum tube blank are on the same axis. The device of the invention has the advantages of simple equipment, high productivity, easy operation, energy saving and good joint quality.