21results about How to "Good weldability" patented technology

The invention provides low-yield-ratio super-thick maritime work steel with excellent core low-temperature toughness and a manufacturing method of the low-yield-ratio super-thick maritime work steel, and belongs to the field of steel and iron material preparation. The low-yield-ratio super-thick marine steel with the excellent core low-temperature toughness comprises the following chemical components in percentage by mass: 0.10%-0.15% of C, 0.35%-0.45% of Si, 1.20%-1.50% of Mn, 3.00%-3.50% of Ni, 0.30%-0.50% of Mo, 0.15%-0.3% of Cr, 0.01%-0.02% of Ti, 0.030%-0.040% of V, 0.050%-0.060% of Nb, 0.0016%-0.0020% of B, 0.15%-0.25% of Cu, 0.060%-0.070% of Al, less than or equal to 0.010% of P, less than or equal to 0.004% of S, less than or equal to 0.39% of CET and the balance of Fe and inevitable impurities. According to the invention, a component design thought of a low-C, Ni-Nb-Mo-Al-B system is adopted, and a three-section rolling and quenching and tempering heat treatment process is combined. Through strict control of smelting continuous casting, controlled rolling and controlled cooling processes and quenching and tempering heat treatment parameters, the super-thick marine steel with excellent comprehensive mechanical properties is successfully prepared. The steel shows good low-temperature toughness in the core part, and meanwhile, the steel has a relatively low yield ratio. According to the low-yield-ratio super-thick maritime work steel with the excellent core low-temperature toughness, the thickness range is 80-150 mm, the yield strength is larger than or equal to 690 MPa, the tensile strength is larger than or equal to 920 MPa, the percentage elongation after fracture is larger than or equal to 20%, the yield ratio is smaller than or equal to 0.77, and the impact energy KV2 at the temperature of-60 DEG C is larger than or equal to 80 J.

The utility model provides an air-cooled closed case suitable for a 6U module. The air-cooled closed case suitable for the 6U module comprises a closed case body used for containing the 6U module and a fan module used for dissipating heat of the case body. A pair of oppositely-arranged ground box walls of the case is configured to be of a heat dissipation plate structure; the heat dissipation plate structure comprises a heat conduction mounting plate, and a plurality of heat dissipation fins are arranged on the side, facing the exterior of the closed cavity, of the heat conduction mounting plate and are arranged at equal intervals in the length direction of the heat conduction mounting plate; a plurality of heat conduction bosses are arranged on the side, facing the interior of the closed cavity, of the heat conduction mounting plate and are arranged at equal intervals in the length direction of the heat conduction mounting plate. Every two adjacent heat conduction bosses form a guide groove; the 6U module is fixedly connected in the guide groove through the module heat conduction plate and the auxiliary heat conduction plate. The air-cooled closed case is more reasonable in air duct design, optimized in heat dissipation path, improved in heat transfer efficiency and enhanced in heat dissipation capability, and provides good working environment conditions for functional modules.

The invention provides a processing method of a permanent magnet synchronous motorized spindle motor for a high-speed high-precision numerical control machine tool, which is used for optimally designing the processing technologies of a stator iron core, an armature winding, grinding of a stator iron core with a winding and a rotor iron core. A five-in-one lamination process is designed for the stator core, a dynamic paint dipping process is designed for the armature winding, a cooling-liquid-free intermittent air-cooling dry grinding process is designed for the stator core with the winding, and a seven-step lamination forming process is designed for the non-uniform segmented herringbone skewed pole rotor core. The electrical performance of the motorized spindle motor can be improved, and the overall precision of the motorized spindle can be improved.

The invention relates to a preparation method of an integrated light-weight launch vehicle tail section, and belongs to the technical field of launch vehicles, and the preparation method comprises the following steps: S100, carrying out forward and reverse bidirectional profiling on an aluminum honeycomb panel to obtain a first arc plate which adopts a three-section arc structure, and taking an arc positioned in the middle as a first arc part, the arcs located at the two ends serve as second arc parts, and the first arc parts and the second arc parts are tangent and opposite in direction. S200, performing one-way compression on the aluminum honeycomb panel to obtain a second arc plate; s300, the second arc plates are welded to the two ends of the first arc plate correspondingly to obtain semicircular wall plates, and the circle centers of the second arc parts coincide with the circle centers of the second arc plates; and S400, the step S100 to the step S300 are repeated, the two wall plates are in butt joint and then welded, and the annular carrier rocket tail section is obtained.The technical problem that in the prior art, the development requirements of light weight, modularization and low cost cannot be met can be solved.

The present invention relates to the technical field of ultrasonic welding, and discloses a welding head and welding equipment that generate circular tensile vibrations. The welding head that generates circular tensile vibrations includes: a connecting portion, the connecting portion having a top surface, the center of the top surface of the connecting portion having a connecting hole, the connecting hole being used to connect and fix with a transducer; an intermediate connecting rod, one end of the intermediate connecting rod being connected to the center of the bottom surface of the connecting portion; a welding portion, the welding portion being disc-shaped, the center of the welding portion being connected to the other end of the intermediate connecting rod. The technical solution of the present invention provides a welding head and welding equipment that generate circular tensile vibrations, the welding portion can extend into the inner side of a workpiece for welding, and generates circular tensile vibrations, with good welding effect and higher efficiency.

The utility model discloses a lithium battery assembly rack convenient for batch processing, and relates to the technical field of lithium battery assembly, the lithium battery assembly rack comprises an assembly rack frame and a heat dissipation fan, one side of the assembly rack frame is provided with a groove, the heat dissipation fan is fixedly connected in the groove, one side of the heat dissipation fan is fixedly connected with a dustproof net, and the dustproof net is fixedly connected with a motor. The lithium battery assembling frame comprises an assembling frame body, the bottom of the assembling frame body is fixedly connected with a support, the top of the assembling frame body is fixedly connected with a driving mechanism, and the left side and the right side of the assembling frame body are each provided with two sets of grooves. The welding degree is improved, meanwhile, the machining efficiency is improved, the labor input cost is reduced, the positioning mechanism is arranged on one side of the lithium battery body, after each string of lithium batteries are fixed, a nickel sheet insulating material in the positioning mechanism is used for separating each string of lithium batteries, and the situation that short circuit occurs later due to the fact that the outer skin of the lithium battery body is damaged is prevented.

An aspect of the present invention may provide: a hot-rolled steel sheet that is excellent in terms of yield strength, vibration damping ratio, weldability, and weld site-low temperature toughness, and thus has physical properties suitable for application to a hyper tube; and a manufacturing method therefor.

The invention belongs to the technical field of high-strength and tough aluminum alloy profiles, and discloses a high-strength and tough aluminum alloy and a hollow structural profile and a preparation method thereof, wherein the high-strength and tough aluminum alloy comprises Si: 0-0.35; Fe: 0-0.4; Cu: 0.25-0.35; Mn: 0.3-0.5; Mg: 1.2-1.8; Cr: 0.1-0.2; Zn: 3.5-5.0; Zr: 0.05-0.2; Ti: 0-0.1; the remainder is aluminum and other inevitable impurity elements, and the content of the other inevitable impurities is less than 0.2. The aluminum alloy after optimizing the alloy composition of the invention not only has excellent welding performance, but also has excellent mechanical properties, and it is easy to prepare a high-strength and tough aluminum alloy hollow structural profile. The prepared hollow structural aluminum alloy profile has a yield strength greater than 340MPa, a tensile strength greater than 400MPa, and an elongation greater than 10%.

The invention relates to weldable hydrogen embrittlement-resistant high-strength corrosion-resistant austenitic steel based on material calculation and a preparation method thereof. The weldable hydrogen embrittlement-resistant high-strength corrosion-resistant austenitic steel comprises the following components in percentage by weight: less than 0.03% of C, 0.27%-0.3% of N, 0.18%-0.22% of Si, 2.3%-2.5% of Mn, 15%-18% of Cr, 18%-20% of Ni, 1.4%-1.6% of Mo, 1.9%-2.1% of Co, 0.3%-1% of Nb, 0.3%-1% of V and the balance of Fe and impurities. The yield strength of the finished product is larger than 800 MPa, the tensile strength is larger than 1000 MPa, and the ductility is larger than 23%. The weldability is good; the self-corrosion potential is greater than-0.6 V, and the self-corrosion current is less than 1.5 * 10 <-5 > A / cm < 2 >. And the hydrogen embrittlement sensitivity coefficient at room temperature is less than 18%. According to the method, smelting components are accurately designed through multi-dimensional component calculation, the smelting, casting, hot rolling and heat treatment processes are optimized through full-process calculation, and the weldability, hydrogen brittleness resistance, corrosion resistance and mechanical properties of the austenitic stainless steel are improved.

The invention discloses low-C-high-Mn-Ni-Cu corrosion-resistant L555-grade subsea pipeline steel and a preparation method thereof, belongs to the technical field of subsea pipeline steel manufacturing, and aims to solve the technical problem that existing L555-grade pipeline steel is poor in corrosion resistance and low-temperature toughness. The low-C high-Mn-Ni-Cu corrosion-resistant L555-grade subsea pipeline steel provided by the invention is prepared from the following components in percentage by mass: 0.031 to 0.045 percent of C, 2.00 to 2.10 percent of Mn, 0.15 to 0.22 percent of Si, 0.60 to 0.80 percent of Ni, 0.31 to 0.40 percent of Cu, 0.15 to 0.20 percent of Cr, 0.020 to 0.030 percent of Nb, 0.010 to 0.015 percent of Ti, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.004 percent of N and the balance of Fe and inevitable impurities. The L555-grade subsea pipeline steel provided by the invention has good corrosion resistance and low-temperature toughness, and is suitable for deepwater drilling riser main pipes and other pressure-bearing service components.

An embodiment of the present invention relates to a cylindrical secondary battery which may comprise: a cylindrical can; an electrode assembly accommodated in the can and formed by stacking a first electrode plate, a separator, and a second electrode plate and winding in a cylindrical shape, wherein a first electrode uncoated portion of the first electrode plate protruding at one end in the longitudinal direction and a second electrode uncoated portion of the second electrode plate protruding at the other end thereof; a cap assembly coupled to one side of the can in a state in which the electrode assembly is accommodated in the can; a first electrode current collector plate which is located between the first electrode uncoated portion and the can and electrically connected to the first electrode uncoated portion and the cap assembly; a second electrode current collector plate which is located between the second electrode uncoated portion and the cap assembly and electrically connected to the second electrode uncoated portion and the can; a first auxiliary plate which is located between the first electrode uncoated portion and the first electrode current collector plate and electrically connected to the first electrode uncoated portion and the first electrode current collector plate; and a second auxiliary plate which is located between the second electrode uncoated portion and the second electrode current collector plate and electrically connected to the second electrode uncoated portion and the second electrode current collector plate.

The invention discloses a hot-rolled pipeline steel strip with high fracture toughness for a straight seam HFW welding pure hydrogen conveying pipeline and a manufacturing method of the hot-rolled pipeline steel strip. The hot-rolled pipeline steel strip comprises the following chemical components in percentage by mass: 0.03-0.06% of C, 0.05-0.20% of Si, 0.50-0.80% of Mn, 0.005-0.008% of Nb, 0.010-0.020% of Ti, 0.020-0.030% of Alt, less than or equal to 0.010% of P, less than or equal to 0.0020% of S, less than or equal to 2ppm of H, less than or equal to 30ppm of O, less than or equal to 50ppm of N and the balance of Fe and inevitable impurities. The hot-rolled pipeline steel strip has high fracture toughness.

This utility model discloses a composite water-cooled plate for a battery tray and the battery tray itself. The composite water-cooled plate includes: a water-cooled channel plate with a recessed water channel groove on one side; and a water-cooled cover plate, which is a composite plate formed by a first plate layer and a second plate layer. The cover plate covers the water-cooled channel plate, and the first plate layer and the water-cooled channel plate are connected by resist welding. A cooling water flow channel for heat exchange is formed between the water-cooled channel plate and the water-cooled cover plate. This utility model, by using a water-cooled plate composed of stainless steel plate and steel-aluminum composite plate, increases the overall structural strength, solves the problem of poor structural strength in existing all-aluminum liquid cooling plates, improves its load-bearing capacity and the protection level of the battery tray, and ensures the safe operation of the battery pack.

The utility model relates to the technical field of building structure design, in particular to a box-shaped aluminum alloy component and steel component rigid connection joint structure which comprises a box-shaped steel component, a box-shaped aluminum alloy component and a connecting assembly. The connecting assembly comprises a steel corbel and a plurality of connecting plates, one end of the steel corbel is connected with the box-shaped steel component in a welded mode, and the other end of the steel corbel is connected with the box-shaped aluminum alloy component in a welded mode. And one end of the connecting plate is attached to and connected with the outer wall of the box-shaped aluminum alloy component, and the other end of the connecting plate is attached to and connected with the outer wall of the steel corbel. Due to the fact that aluminum alloy welding is difficult, the strength after welding is greatly reduced, and welding difficulty and manufacturing cost are high, the steel corbel is arranged between the box-shaped steel component and the box-shaped aluminum alloy component for transfer connection, the technical problem that the steel component and the aluminum alloy component are difficult to reliably and rigidly connect is solved, the whole joint structure is high in assembly degree, high in machining and manufacturing precision and low in cost. And construction and installation are convenient.

According to the nickel-palladium-gold lead frame and the preparation method thereof provided by the invention, in the preparation method, acid pickling is carried out on the substrate after the nickel layer is plated and before the palladium layer is plated, the content of sulfuric acid in the acid pickling liquid per liter is 5.5%-8.0%, the acid liquid with high concentration can better clean organic matters, and the nickel passivation layer can be better and completely removed, so that the service life of the nickel-palladium-gold lead frame is prolonged, and the service life of the nickel-palladium-gold lead frame is prolonged. Therefore, the binding force of the nickel plating layer and the palladium plating layer is improved, the situation that the binding force of the nickel plating layer and the palladium plating layer is reduced due to the fact that the nickel plating layer is polluted by organic matter is avoided, the compactness of the nickel plating layer is improved, and the weldability of the nickel plating layer is improved; in the step S2, the step S23 is further included, the concentration of a gold cylinder is 0.8-1.6 g / L when the gold layer is plated, the intense reaction between gold plating liquid medicine and the nickel plating layer can be avoided, deep corrosion to the nickel plating layer is avoided, grain boundary corrosion is avoided, and the black disc phenomenon is avoided, so that the quality of the nickel plating layer is improved, and the defective product rate of the lead frame is reduced; and the defective product rate of the nickel-palladium-gold lead frame prepared according to the method is relatively low.

The invention relates to a double-sided water-cooling power module made of a mixed material. The double-sided water-cooling power module comprises a mounting shell and a pre-assembled power module mounted on the mounting shell, the pre-assembled power module comprises a first heat dissipation piece and a second heat dissipation piece which are arranged in parallel, and the first heat dissipation piece is mounted on the mounting shell and assembled together with the second heat dissipation piece through a clamp; a plurality of power chips are arranged between the first heat dissipation piece and the second heat dissipation piece at intervals; each of the first heat dissipation piece and the second heat dissipation piece comprises a bottom plate directly facing the power chip, a cover plate arranged on one surface, deviating from the power chip, of the bottom plate, and heat dissipation fins arranged between the bottom plate and the cover plate; the bottom plates, the cover plates and the heat dissipation fins of the first heat dissipation piece and the second heat dissipation piece are all independently selected from one of copper, aluminum or stainless steel, and the bottom plates of the first heat dissipation piece and the second heat dissipation piece are made of different materials. Compared with the prior art, the heat dissipation requirement of the high-power-density IGBT module can be met, and the balance between mechanical performance and manufacturing cost can be considered.

The present invention provides a Zn-Mg-Al-based plated steel sheet excellent in corrosion resistance and excellent in at least one of weldability and phosphatability, and a manufacturing method therefor.

The present invention belongs to the field of greenhouse heating technology, specifically a greenhouse enclosure curtain wall with active heat storage and its greenhouse back wall and wall material. The curtain wall system of the present invention is composed of an XPS-PVC greenhouse back wall, a black film, an upper water pipe, a return pipe, and a water tank equipped with a water pump. Water is injected from the upper water pipe and flows between the wall and the black film, and is guided back to the water tank equipped with a water pump by the return pipe. The XPS-PVC composite wall material of the present invention uses PVC as a finishing layer, and flame-retardant XPS is sandwiched in the middle as an insulation layer. The XPS-PVC greenhouse back wall of the present invention is borne by a greenhouse steel frame to bear the greenhouse load, and multiple pieces of XPS-PVC composite wall materials are spliced ​​into wall panels and fixed on the steel frame of the north wall of the greenhouse. The curtain wall system of the present invention can complete the process of active heat storage and release by directly using the wall, without the need to set up a separate heat collection system, occupying less space, low cost, and easy to promote.

The invention discloses a preparation method of corrosion-resistant L555-grade subsea pipeline steel, belongs to the technical field of subsea pipeline steel manufacturing, and aims to solve the problem that the strength, toughness and corrosion resistance of pipeline steel are difficult to synergistically improve due to insufficient tissue regulation and control capability in an existing L555-grade pipeline steel preparation method. The invention provides a preparation method of corrosion-resistant L555-grade subsea pipeline steel. The preparation method comprises the following steps: step 1, smelting and continuous casting process; step 2, controlling a rolling process; the method comprises the following steps: firstly, heating a continuous casting billet to 1180 + / -10 DEG C, and preserving heat for 30-60 minutes; step 3, a third-stage temperature control cooling process; the rolled plate blank is sequentially subjected to first-stage rapid cooling, second-stage medium-speed cooling-isothermal keeping stage and third-stage air cooling treatment; 4, the rolled subsea pipeline steel is subjected to online self-tempering treatment; the on-line self-tempering treatment process comprises the following steps: after cooling, carrying out on-line tempering treatment on the steel plate at 450-480 DEG C for 3-8 minutes. The corrosion resistance of the L555-grade subsea pipeline steel can be remarkably improved.

The present invention relates to a secondary battery in which an electrode assembly and a current collector can be easily welded and safety can be improved. As an embodiment, a secondary battery is disclosed, the secondary battery comprising: an electrode assembly formed by winding a first electrode plate having a first electrode uncoated portion, a separator, and a second electrode plate having a second electrode uncoated portion, the first electrode uncoated portion protruding upward, and the second electrode uncoated portion protruding downward; and a first current collector electrically connected to the first electrode uncoated portion and having a concave-convex portion protruding downward, wherein the width of the concave-convex portion widens from the center of the first current collector toward the periphery of the first current collector.

The invention discloses a method for producing H08A semi-killed low-silicon welding rod steel by adopting a small square billet process, and belongs to the technical field of ferrous metallurgy. The method comprises the four procedures of converter smelting, LF refining, continuous casting and rolling, by optimizing the technological parameters of all the procedures, precise control over the silicon content and effective removal of inclusions are achieved, and the product quality stability is improved; the sulfur content and the phosphorus content are both smaller than or equal to 0.030%, the inclusion rating is smaller than or equal to 1.5 grade, and the purity of the welding rod steel is improved; the silicon mass fraction is stabilized at 0.03-0.07%, and the problem that the welding performance is poor due to the fact that the silicon content in a traditional process exceeds the standard is solved.