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3980 results about "Gas protection" patented technology

Gas protection is a technical solution to prevent or to control gas penetration into properties. The control of gas migration is normally achieved by blocking the pathway or removing the source of the gas generation. There are several methods available to achieve the protection of existing/new build properties and also another factor is the use of the property and size (economic factors).

Marine engineering large thick steel plate submerged arc welding process method in low-temperature environment

The invention belongs to the field of welding, in particular to a process method applicable to marine engineering large thick steel plate submerged arc welding in low-temperature environment, which comprises a welding method, welding material selection, a welding order, a welding process and the selection and control of various welding process parameters. The method renders with carbon dioxide gas protection welding, and fills and faces through an automatic submerged arc welding; stops welding when the welding reaches more than two thirds of the thickness of a large groove during the welding process, clears chips on the back side and completes the welding of the other side; finally completes the welding of the first side; strictly controls all relevant process parameters of the welding during the welding process, and solves the problems of poorer anti-crack toughness of welding seams and heat affected zones caused by too high cooling speed of the welding seams and too high temperature; can ensure good anti-crack toughness of a welding seam connector without heat treatment after welding; and can meet the requirements of welding of an E36 plate with the thickness of 35 to 77mm under the working environment at the temperature of above -30DEG C, simplifies the production process, shortens the production cycle and reduces the cost.
Owner:PENGLAI JUTAL OFFSHORE ENG HEAVY IND CO LTD

Method for preparing bimetal composite plate by stirring friction braze welding

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.
Owner:XI AN JIAOTONG UNIV

Method for preparing graphene-coated carbon microsphere material by coating graphene oxide on carbon microsphere

InactiveCN102544459AWide range of optional preparation equipmentCell electrodesSucroseHazardous substance
The invention relates to a method for preparing a graphene-coated carbon microsphere material by coating graphene oxide on a carbon microsphere. The method comprises the following steps of: preparing a graphene oxide dispersion solution; preparing the carbon microsphere through taking glucose, sucrose and starch as a carbon source by using a hydrothermal method under acidic conditions; adding the dried carbon microsphere into the graphene oxide dispersion solution; filtering and drying to obtain a graphene-oxide-coating carbon microsphere product; and carrying out thermal reduction on the graphene-oxide-coating carbon microsphere product under a gas protective atmosphere, and naturally cooling to room temperature to obtain a graphene-coaed carbon microsphere product. Compared with the prior art, the method provided by the invention has the advantages that no harmful substances are used in a preparation process, the range of selectable preparation equipment is wide, the raw materials, i.e. graphene and the carbon microsphere, are not required for being subjected to further modification and processing, the water resources used in the preparation process can be recycled and utilized, and products with different proportions and different degrees of reduction can be prepared according to different needs, so that a precondition is provided for the diversity of materials.
Owner:上海碳源汇谷新材料科技有限公司

Method for improving compactness of 3D (three dimensional) printing metal part by adopting second laser beam

The invention discloses a method for improving the compactness of a 3D (three dimensional) printing metal part by adopting a second laser beam. The method comprises the following steps of: (a) pretreating a printing base and a printing baseplate; (b) carrying out 3D printing on the printing baseplate by using a first laser beam and alloy powder according to a preset moving trajectory by the way of lap joint step by step and superimposing layer by layer, protecting the surface of a workpiece and the flow field of the alloy powder by an inert gas in the process of printing, and melting the alloy powder by using the first laser beam to form a printing layer; (c) remelting the printing layer which is obtained by carrying out 3D printing by using the following second laser beam, wherein the second laser beam advances spirally or zigzag or telescopes back and forth according to the moving trajectory of the first laser beam; and (d) post-processing the metal part. Because the printing layer is remolten synchronously by adopting the second laser beam, the defects of holes, air pockets, thermal cracks and interface cracks generated in the process of carrying out 3D printing can be reduced, and the compactness of a metal tool can be improved.
Owner:张翀昊

Microbeam tungsten argon arc welding method for magnesium alloy thin-walled tube

The invention relates to a microbeam tungsten argon arc welding method for a magnesium alloy thin-walled tube. A low-magnesium aluminum alloy welding wire is used as a filling material, and the thin-walled tube is welded by a microbeam tungsten argon arc welding process under inert gas shielding. The low-magnesium aluminum alloy welding wire comprise 9.5%-11.6% of Al (aluminum), 0.6%-1.75% of Zn (zinc), 0.15%-0.35% of Mn (manganese), 0.01%-0.05% of Cu (copper), 0.02%-0.05% of Si (silicon) and the balance Mg (magnesium) in mass percent. The microbeam tungsten argon arc welding method for the magnesium alloy thin-walled tube is high in welding efficiency and convenient and flexible in application, and can be used for obtaining a crack-free welding joint without magnesium-aluminum brittle compounds. Compared with a conventional tungsten argon arc welding method, the microbeam tungsten argon arc welding method has the advantages that arc stability of microbeam argon arc welding for the magnesium alloy thin-walled tube is obviously improved, the tensile strength of the welding joint is 30% higher than that of a conventional tungsten argon arc welding joint, the elongation of the welding joint is increased by 10%, and the use requirements of industrial production on magnesium alloy thin-walled tube welding component can be met.
Owner:SHANDONG UNIV

Manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube

The invention discloses a method for producing a JCOE longitudinal submerged arc welded pipe of an X80 pipeline steel. The invention is used for producing an oil and gas conveying tube with high intensity and high tenacity. The method includes using an HTP X80 controlled rolling steel pipe with a chemical composition of 0.03 to 0.05 percent of C, 0.20 to 0.30 percent of Si, 1.65 to 1.75 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.15 percent of Nb plus Ti and 0.5 to 0.7 percent of Ni plus Cr plus Cu. A steel plate is made into the oil and gas conveying tube with high intensity and high tenacity through the working procedures like edge milling, edge bending, a 'JCO' forming technique under multi-pass pressing, gas protection prewelding, inside welding, outside welding, diameter enlarging, ultrasonic checking, x-ray checking, hydraulic pressure testing, tube end to arris, ultrasonic checking and X-ray checking, etc. The inside welding and the outside welding of a steel tube adopt four-wire serial union melt welding and control the technical parameters of welding through selecting a suitable welding wire and a welding fluid; thereby controlling the components and organizations of a weld joint to lead the performance of the weld joint to reach the performance requirements of X80.
Owner:BC P INC CHINA NAT PETROLEUM CORP +2

Method for welding rocking arc narrow clearance melting electrode with gas protection and welding torch

InactiveCN101412143AMeet the needs of different welding processes for weldsReduce drive powerElectrode supporting devicesCouplingEngineering
The invention discloses a rocking arc narrow gap consumable electrode gas shielded welding method and a welding torch. The method comprises the following steps: a connecting cable is fixed on an electric brush mechanism and a coupling head; a hollow shaft motor is connected with a straight conducting rod through a shaft joint; a welding wire passes through a center hole of a cable coupling head, and penetrates out a center hole of a current contact nozzle; the lower end of the straight conducting rod is fixed with a connecting piece; and one end of a minor bend conducting rod is connected with the straight conducting rod through the connecting piece, while the other end of the minor bend conducting rod is connected with the current contact nozzle. The hollow shaft motor directly drives the straight conducting rod and the minor bend conducting rod capable of extending into a divided edge of a workpiece to make reciprocating rotation around the central axial line of the welding torch, thereby driving electric arc of the end of the welding wire send from the center hole of the current contact nozzle to make arc rocking in the divided edge of the workpiece so as to realize rocking arc narrow gap welding. The welding torch has the advantages of simple and compact structure, low implementation cost, high reliability of operation, strong practicality, and can adapt requirement of welding process for mean position and spatial position with different welding seams. The welding wire has strong rocking regulation, good directivity of the electric arc, and high welding quality.
Owner:JIANGSU UNIV OF SCI & TECH

Detection method and device of coke reactivity and post-reaction heat-treatability

The invention discloses a detection method and device of the reactivity and post-reaction heat-treatability of coke and the method and device are used to detect the gasifying starting temperature, reactivity and post-reaction heat-treatability of coke. The detection method adopts an electric furnace as a heating furnace and uses an electronic balance for to weight. The reactivity detection method is performed on the condition of first heating and second keeping temperature constant, the electronic balance is used to measure the mass loss of a coke sample; and when the coke weight-loss ratio equals a specified value, the measurement weight-loss ratio (time) minus one is used as the reactivity index; the detection method of the post-reaction heat-treatability of coke is that when the coke weight-loss ratio equals the specified value, coke is continuously heated under the protection of inert gas, and the coke weight-loss ratio is used as the post-reaction heat-treatability index during the detection period of heat treatment. The detection device comprises the electronic balance, a reaction tube support, a reaction tube, the heating furnace and a heating furnace elevating mechanism. The method and device of the invention can provide 1500-1600 DEG C of detection temperature and the coke thermal characterization in the bosh (before an air port) and the hearth can be displayed.
Owner:山西今日太工煤焦技术研究有限公司

Ultrasound wave and melt pole electrical arc compound welding method

The invention provides a weld method compounding an ultrasonic and a gas metal arc welding so as to make use of the cavitation effect and the vibration effect of the ultrasonic to lead welding drops generated by the gas metal arc welding to be smoothly transmitted to a welding pool when the drops are still small. And when in welding, an electric arc shrinks under the effect of the ultrasonic and then the stiffness of the electric arc can be enhanced, which has a significant application value for welding of special positions such as a full-position welding, an overhead position welding, a flat position welding and a horizontal position welding, etc.. The invention includes the following steps: an ultrasonic generator is connected with an ultrasonic transducer 2 to convert ultrasonic energy into mechanical vibration; an ultrasonic transformer 3 enlarges amplitude; a conductive tip 5 is combined with the ultrasonic transformer; a protective gas nozzle 4 is fixed on the vibration node of the transformer; a welding wire 1 is connected with the conductive tip 5 to start a welding power supply 9 and then start an ultrasonic power supply after the electric arc becomes stable, then the transducer converts electrical energy into vibration and the ultrasonic transformer enlarges the ultrasonic amplitude which is transmitted to a melting electrode.
Owner:HARBIN INST OF TECH

Combination manufacturing method and device for injection mold with conformal cooling water path

The invention discloses a combination manufacturing method and device for an injection mold with a conformal cooling water path. The device comprises a light beam focusing system, a close wave length coaxial vision positioning system, a powder pavement system and a gas protection system. The gas protection system comprises a sealed forming chamber, a shielding gas device and a powder purification device, wherein the shielding gas device is connected to one side of the sealed forming chamber, and the powder purification device is connected to the other side of the sealed forming chamber. The method is a combination processing method combined with the laser region selection fusion technology and the precision cutting processing technology, the advantages of the laser region selection fusion flexible processing are retained, and the feature that the precision of the high-speed cutting processing is good is given to play. In the process of region selection laser fusion processing, laser surface refusion processing is carried out on each layer, and the compactness and the surface quality of the mold are improved. The technique of density changing rapid manufacturing is adopted, and manufacturing efficiency is improved. Precision mold components with the interior special-shape cooling water path and the complex inner cavity structure can be integrally processed at a time.
Owner:SOUTH CHINA UNIV OF TECH

Robot automatic welding production line of middle groove and technological method thereof

The invention relates to the technical field of production manufacturing of a cast middle groove by a heavy-duty scraper conveyor used on coal mines, and provides a robot automatic welding production line of a middle groove and a technological method thereof. The production line designs 8 stations according to the manufacturing process flow of the middle groove, comprises 6 parts of a primary assembly station, a middle plate preheating station, a backing welding station, a middle plate and bottom plate robot welding work station, a secondary assembly station and a bending rail rest robot welding work station, and forms an integrated production line layout of the middle groove. The invention integrates and uses multiple technologies of a welding robot, double-wire welding, digital double-pulse welding power source, computer control, high-efficiency flame preheating and the like, and establishes technical measures of preheating temperature, bevel form, welding sequence, welding parameters and the like; and the welding process is controlled by a computer, thereby realizing high-efficiency automatic robot welding of the middle groove in the overall process. Compared with the traditional manual gas shielded welding, the invention obviously improves the welding quality of the middle groove and increases the welding efficiency by 3-4 times.
Owner:CHINA COAL ZHANGJIAKOU COAL MINING MACHINERY

Preparation method of high-reaction-activity hydroxyl acrylic resin

The invention relates to a preparation method of high-reaction-activity hydroxyl acrylic resin. According to the invention, a solvent in a reactor is heated to a preset temperature under the protection of an inert gas; a mixture of a monomer component A with hard monomer as a main component (and comprising a small amount of soft monomer, hydroxyl monomer and carboxyl monomer) and an initiation agent is slowly added; a reaction is carried out for a certain period of time with maintained temperature; a mixture of a monomer component B with soft monomer as a main component (and comprising a small amount of hard monomer, hydroxyl monomer and carboxyl monomer) and an initiation agent is slowly added; and reaction is carried out for a certain period of time with maintained temperature, such that acrylic resin comprising hydroxyl is obtained. The invention has the characteristic that common monomers are adopted, and only the synthesis process is changed wherein monomer dropping sequence is changed, such that resin molecular structure is substantially changed, and the synthesized hydroxyl acrylic resin shows high reaction activity during a curing reaction. The method provided by the invention also has the advantages of low cost, simple process, and suitability for industrialized productions.
Owner:XI AN JIAOTONG UNIV +1

Device and method for use of impeller of laser 3D (three dimensional) -printing pump

The invention discloses a device and a method for the use of an impeller of a laser 3D (three dimensional) -printing pump, and belongs to the field of 3D printing technology. The device comprises a laser system, a gas protection system, a preheating system, a powder feeding system, a powder paving system, a powder recycle system and a computer system. The manufacturing method mainly comprises the following steps that 1, a CAD solid model of the pump impeller is drawn, and the model is subjected to hierarchical slicing along the Z direction; 2, the slice in each layer is zoned into a zone I and a zone II according to the performance requirements of the pump impeller; 3, the zone I of each slice layer is subjected to low-speed sintering by using powder A, and the zone II is subjected to low-speed sintering by using powder B. The surface of a workpiece and the powder flow filed are subjected to the inert gas shielding in the process of printing. According to the device and the method for the use of the impeller of the laser 3D-printing pump, different requirements of different positions of the pump impeller on mechanical performance can be met, the printing quality and speed are also improved, and the manufacturing cost is reduced.
Owner:江苏大学扬州(江都)新能源汽车产业研究所
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