81results about How to "Weld tightly" patented technology

An improved structure for a seat supporting frame of a chair includes a seat, front legs and back legs mounted on the two sides, a horizontal support having flattened ends and forming a bent section. The bent section is welded with the inner side of the front leg. The two ends of the bent corners are formed with a curved section. The sides of the seat has vertical support pieces, one end of which is set on the side of the seating frame, and the other end is connected to the front leg. A stop abutment, mounted on the lower section of the vertical support piece, is firmly abutted to the inner side of the curved section of the horizontal support, so as to prevent it from sliding and fracture. The horizontal support, the front leg, the vertical support piece, and the stop abutment are held together tightly.

The invention discloses a stirring head for friction stir welding, and belongs to the field of friction stir welding technical devices. The stirring head comprises a stirring head shaft shoulder; a stirring needle is positioned below the stirring head shaft shoulder; the bottom surface of the stirring head shaft shoulder is an inclined surface, and is a contact surface between the shaft shoulder and a welded workpiece; the direction of the inclined surface is as follows: when the stirring needle is downwards, the inclined surface is inclined from the center of the bottom surface to the outer and upper directions; and an included angle between the inclined surface and a vertical line of axis of the stirring head is 1-10 degrees. The stirring heads forms a compact welding line, improves the quality of the welding line, and guarantees high reliability and stability of the welding line.

The invention relates to an assembly process for a stator of a 3MW permanent magnet synchronous wind-driven generator. The process comprises the following steps of: A, assembly of a stator tooth pressing plate; B, lamination of a stator core; C, assembly of a cooling system; D, assembly of the stator; and E, paint dipping and coating of the stator. By the assembly process for the stator of the 3MW permanent magnet synchronous wind-driven generator, the assembly is convenient; core lamination effects are good; radiation efficiency can be effectively improved; a cooling water pipe has good pressure resistant effects and high reliability; and a coil has high insulating and sealing properties.

The invention discloses a steel tube manufacturing method. The steel tube manufacturing method comprises the steps of selection and inspection of raw materials, welding of arc striking and extinguishing plates, edge milling of a steel plate, prebending of the steel plate, forming of a JCO forming machine, internal and external welding, cut-off of the arc striking and extinguishing plates, weld flaw inspection, mechanical hole enlargement, rounding of the steel plate and other steps. According to the steel tube manufacturing method, novel Q345GJC-Z15 pipes are selected as the steel plate raw materials; the arc striking and extinguishing plates can ensure the welding quality; an obtained steel tube is firm and tight in welding, the influence of radial force on the service life of the steel tube can be reduced, and therefore the service life of the steel tube is prolonged; meanwhile, the bearing capacity of the steel tube is enhanced, and the use cost is lowered.

The present invention relates to a method and equipment for improving latent heat utilization rate in seawater desalination and provides a method for improving latent heat utilization rate in seawater desalination. The method comprises the following steps: providing a thermoelectric device and electrifying the thermoelectric device. The invention further discloses equipment for improving latent heat utilization rate in seawater desalination.

The invention provides a rock-socketed hollow precast pile and a rock-socketed construction method using the precast pile. The precast pile comprises a hollow pile body and a rock-socketed pile tip. The rock-socketed pile tip comprises a steel pipe pile joint section and a big-end-up circular-truncated-cone-shaped pile tip prefabricated by concrete, the steel pipe pile joint section comprises a thin-wall steel pipe, core filling concrete filled in the thin-wall steel pipe and a plurality of stiffening plates welded to the outer wall of the thin-wall steel pipe, and the core filling concrete and the circular-truncated-cone-shaped pile tip are integrally formed in a pouring mode. When rock-socketed construction is carried out, firstly, pile sinking equipment is adopted for sinking a precastpile till drilling footage is difficult, then, a rock core drilling machine is adopted for drilling or crushing plain concrete filling cores at the pile tip part and a hard soil layer and a rock stratum below the pile tip part from the hollow part of a pile body of the hollow precast pile to the designed pile bottom elevation, and a rock-socketed section pile hole is formed; and finally, the forcetransmission framework is put in, cementing materials are injected, and construction of the hollow precast rock-socketed pile is completed.

The invention discloses an LED inverted substrate, which comprises an aluminum substrate and a copper conductive layer. The top of the aluminum substrate is horizontally connected with an insulating layer. The top of the insulating layer is horizontally connected with the copper conductive layer. A tin layer is arranged on the top of the copper conductive layer. A groove is arranged in the top middle of the copper conductive layer, and the upper part of the copper conductive layer is connected with a flip chip through the groove. The tin layer does not change color after oxidation, and does not affect the product performance. No solder paste is needed during die bonding on the tin layer. The tin layer has a great cost advantage over silver/gold. The thickness of the tin layer is controllable and usually within 8-25 microns. Compared with solder paste having a thickness of 100-130 microns, the tin layer has a shorter heat conduction path. The temperature of a heating block is 230 DEG C,which will not change the color of the ink and can make the flip chip conduct electricity evenly in use.

The present invention relates to a welding-fixing method of a short circuit ring and an adopted short circuit ring. A plank stuff is provided with a through hole, the plank stuff is curled to form a cylinder, and then gas shielded welding is used at the through hole position, the abutting edges after the plank stuff is curled, and the upper edge and the lower edge of the cylinder to weld the cylinder on a fixing surface. The short circuit ring is in the curled plank stuff shape, the plank stuff with the short circuit ring is provided with the through hole used for gas shielded welding. After the short circuit ring adopted by the short circuit ring welding fixing method is fixed, the welding spots are distributed reasonably, the service life is greatly prolonged, without easy loosening, and the manufacture cost is low in the severe and the ultra high frequency mechanical experiment environments; the structure of the short circuit ring adopted by the method is simple, the rationality of the welding fixing spots of the short circuit ring can be effectively ensured, the gap between the short circuit ring and the fixing surface is eliminated, a vibration test is not disturbed by the infirm fixing of the short circuit ring, the short circuit ring has firm structure, the service life of the short circuit ring is prolonged, and correspondingly, the service life and the safety coefficient of a vibrating platform are also improved.

The invention provides an oxygen-free copper composite welding method by combining low pressure diffusion welding with brazing compound welding. The oxygen-free copper composite welding method comprises the steps: step A, preprocessing multiple oxygen-free copper parts to be welded to remove the oxide film on the surfaces of the oxygen-free copper parts; step B, assembling the multiple oxygen-free copper parts, fixing the relative position of each oxygen-free copper part to ensure close contact of welding faces, and carrying out low pressure diffusion welding on the welding faces of the oxygen-free copper parts; step C, placing electric vacuum brazing filler metal in the welding holes preset in the edges of the welding faces and brazing the multiple oxygen-free copper parts. A composite welding head formed through the oxygen-free copper composite welding method is bonded tightly, the precision of welding is high, the vacuum leakproofness is good, and the joint tensile strength is 200-300 MPa, being close to or even higher than the oxygen-free copper base metal strength.

The invention relates to the technical field of metal wire welding arrangement, in particular to a modular efficient wire welding device. The modular efficient wire welding device comprises a mountingplate; a wire feeding module, a tensioning module, a wire clamping module, a liftable wire welding module and a wire breaking module are sequentially mounted on the mounting plate; the wire feeding module is responsible for feeding metal wires; the tensioning module is used for tensioning the metal wires; the wire clamping module is responsible for clamping the metal wires; the wire welding module is responsible for welding the metal wires on a material; and the wire breaking module is responsible for cutting the metal wires. The modular efficient welding wire device has the beneficial effects that through the overall synergistic effect of the wire feeding module, the tensioning module, the wire clamping module, the wire welding module and the wire breaking module, the metal wires are automatically welded into materials, and the modular efficient wire welding device is high in automation degree and compact in welding process and has the advantages of being high in efficiency and easyto control.

The invention relates to a trench and sewage tank connecting structure, in particular to a trench and sewage tank anticorrosion connecting structure which is suitable for aluminum oxide plants and can resist alkali corrosion. The trench and sewage tank anticorrosion connecting structure comprises a sewage tank pit and an alkali-resisting trench. A steel plate rectangular connecting pipe is arranged at a position at which the sewage tank pit is connected with the alkali-resisting trench. A steel plate casing is sheathed outside the steel plate rectangular connecting pipe. The steel plate casing is fixed in the sewage tank pit through flat steel. A sewage tank is arranged in the sewage tank pit. The steel plate rectangular connecting pipe is inserted into the wall of the sewage tank. A steel plate flashing sheet is arranged above the steel plate casing. Alkali-resisting cement is used for the plugging between the steel plate casing and the alkali-resisting trench and between the alkali-resisting trench and the sewage tank pit. The trench and sewage tank anticorrosion connecting structure has the advantages that the tightness is good, the structure is rainproof, the service life is long, and not only can the problem of settlement between two structures be effectively solved, but also the leakage of alkali liquid is effectively prevented and the durability is good.

A one-hole welding mold for electronic components and a welding process, comprising a welding mold body (1), a plurality of positioning welding molds (2) for placing electronic components on the welding mold body (1), the positioning welding The die (2) consists of a small hole (3) and a countersunk hole (4), the small hole (3) and the countersunk hole (4) pass through, and the centers coincide; the small hole (3) is used to place the lead end of the lower lead (5). , the aperture of the small hole (3) is matched with the lead end of the lower lead (5); the countersunk hole (4) is used to place the head of the lower lead (5), the chip (7) and the upper lead (6), The hole diameter of (4) is matched with the head of the lower lead (5). In the present invention, the upper and lower leads and the semiconductor chip are welded in the same hole, and the welding precision is high, and there is no need to worry about welding dislocation and virtual welding, and the product quality and yield are greatly improved.

The invention provides a molybdenum and silicon substrate welding method in a field emission device. The method comprises the steps of evaporating a molybdenum thin film on a silicon substrate, and then welding the silicon substrate on which the molybdenum thin film is evaporated and a molybdenum plate, i.e., plating a molybdenum protecting layer on the silicon substrate to play a brazing filler metal barrier role. Silicon and the molybdenum plate are closely connected and cannot be broken, so the welding strength is greatly improved.

The invention discloses a steel tube bundle composite structure of upset head webs. The steel tube bundle composite structure comprises a steel tube bundle assembly. The steel tube bundle assembly comprises a plurality of steel tube units which are sequentially connected with one another, each steel tube unit is provided with a cavity, and concrete is poured in each cavity; a continuous flange and spliced flanges which are parallel to one another are separated from one another by the upset head webs to form the steel tube units, the end, which is not provided with an upset head, of each upset head web is perpendicularly welded on the continuous flange, and the upset heads of the upset head webs are welded on weld joints among the adjacent spliced flanges; the front-end steel tube unit and the rear-end steel tube unit are respectively closed and welded by steel plates; partition plates among the adjacent steel tube units are formed by the upset head webs. The steel tube bundle composite structure has the advantages that the performance of steel can be sufficiently played by the upset head webs as compared with an existing web with a bent end, and accordingly steel can be saved; the upset heads are closely laid on flange plates, so that the steel tube bundle composite structure is favorable for guaranteeing full and flat weld joints, and the quality of the weld joints can be improved.

The invention relates to the technical field of welding and particularly relates to box beam welding equipment. The box beam welding equipment comprises an X-axis moving device, a Y-axis moving device, a Z-axis moving device, a mounting frame and a welding device, wherein the X-axis moving device, the Y-axis moving device, the Z-axis moving device, the mounting frame and the welding device are connected sequentially; the welding device is installed at the mounting frame; a baffle component is installed at the mounting frame; the welding device is arranged at one side of the baffle component; afirst pressure measuring component and a second pressure measuring component are installed at the mounting frame; the Y-axis moving device is provided with a welding wire conveying device; the box beam welding equipment further comprises a control device; the control device is correspondingly electrically connected with the X-axis moving device, the Y-axis moving device, the Z-axis moving device,the welding device and the welding wire conveying device; and the first pressure measuring component is electrically connected with the second pressure measuring component. Besides, the invention further provides a box beam welding method, the welding efficiency and quality is improved, and injuries of a welding worker are reduced.