53 results about "Hardfacing" patented technology

The invention relates to the technical field of welding wires, in particular to a flux-cored wire for surfacing of a high-corrosion-resistance pipe fitting and a preparation method. The preparation method comprises the steps that the material and thickness of a target pipe fitting are obtained, and a surfacing theoretical welding heat interval and upper and lower limits are determined; the theoretical diameter interval of the flux-cored wire is determined according to the theoretical welding heat interval; determining a target diameter through the depth-to-height ratio; when the diameter is adjusted to the interval limit and still does not reach the standard, the fitting degree of the flux core is optimized according to the depth-to-height ratio difference value; and the corrosion resistance is detected through target welding wire surfacing, and the theoretical welding heat interval is reversely adjusted. According to the method, the theoretical diameter interval of the flux-cored wire is determined through the theoretical welding heat interval, the target diameter of the flux-cored wire is determined based on the actual depth-to-height ratio, and the theoretical welding heat interval is determined based on the actual corrosion resistance parameters, so that an effective surfacing layer is formed during surfacing of the pipe fitting.

The utility model discloses a synchronous rapid driving device for online hard surface surfacing of a grinding roller and a grinding disc, and relates to the technical field of coal mills. The coal mill comprises a coal mill body and a milling roller, an inner gear ring is arranged on the side wall of an inner ring of the coal mill body, a connecting ring is fixedly installed on the side wall of the milling roller, a transmission loose gear ring is fixedly installed on the connecting ring, and the transmission loose gear ring is meshed with the inner gear ring. And a protection mechanism is arranged on one side of the inner gear ring on the side wall of the coal mill body. According to the utility model, the grinding bowl and the grinding roller can synchronously rotate, so that the grinding bowl and the grinding roller can work together, the welding efficiency is further improved, the working period is accelerated, and meanwhile, in the transmission process, the arranged air blowing fan can start to supply air, so that the air is guided into the two air blowing pipes and then is exhausted by virtue of the exhaust holes in the air blowing pipes; in this way, the transmission loose gear ring and the inner gear ring can be cleaned, and then the stability of gear rotation is guaranteed.

The invention provides a high-chromium cast iron surfacing flux-cored wire for a shield tunneling machine and a preparation method of the high-chromium cast iron surfacing flux-cored wire. The high-chromium cast iron surfacing flux-cored wire is formed by wrapping powder with a steel belt, and the powder accounts for 33.0%-36.0% of the total weight of the flux-cored wire; the powder comprises, by mass, 3%-8% of reduced iron powder, 1%-3% of fluorite, 0.5%-1% of rare earth fluoride, 3%-8% of electrolytic manganese, 1%-5% of high silicon iron, 80%-85% of ferrochrome carbide, 5%-9% of graphite and 1%-3% of nickel powder. Wherein the rare earth fluoride is cerium fluoride. The high-chromium cast iron surfacing flux-cored wire for the shield tunneling machine is excellent in welding process, stable in electric arc, small in splashing, attractive in forming and capable of conducting all-position welding.

The invention discloses a high-manganese steel flux-cored wire for surfacing and a preparation method of the high-manganese steel flux-cored wire, and relates to the technical field of welding materials, the high-manganese steel flux-cored wire is composed of a steel outer skin and a flux core, the flux core is wrapped in the steel outer skin, and the flux core comprises, by weight, 0.1-0.6 part of natural rutile, 0.2-0.8 part of ferrosilicon powder and 0.1-0.3 part of potassium titanate. The material comprises, by weight, 20-30 parts of magnesium powder, 0.1-0.4 part of magnesium powder, 0.1-0.3 part of fluoride, 8-11 parts of electrolytic manganese powder and 0.1-0.5 part of quartz sand. Through organic combination of the components, the Brinell hardness HB of deposited metal after welding of the welding wire is larger than or equal to 170. And the wear resistance of the whole welding seam is effectively improved. The welding process performance is good, electric arcs are stable, splashing is small, and formed weld joints are attractive.

A method of forming an overlay between cutter pockets of a polycrystalline diamond rock bit includes inserting a plurality of ceramic dams respectively into the cutter pockets of the rock bit, and applying a hardfacing material using a plasma arc welding process onto a substrate of the rock bit in spaces between the ceramic dams so as to form the overlay. The ceramic dams are electrically non-conductive. Each of the ceramic dams has a cylindrical shape. The cutter pockets are drilled into the substrate of the rock bit. The ceramic dams are inserted into the respective drilled cutter pockets prior to the step of applying the hardfacing material. The ceramic dams can be removed and polycrystalline diamond bits inserted into the pockets.

The utility model relates to welding fixture technical field, concretely relates to laser calibration welding fixture of welding of gate valve, including processing panel, be provided with a plurality of positioning hole on processing panel, the top of processing panel is provided with the roof, the bottom fixed mounting of roof has a plurality of infrared emitter for laser calibration, the below of processing panel is provided with the bottom plate, the upper surface of bottom plate is fixed mounting has a plurality of infrared receiver, infrared receiver, infrared emitter and corresponding positioning hole are located on same vertical axis, the upper surface of processing panel is fixed mounting has a plurality of air cylinders, and the telescopic axle end of air cylinder detachably installs the clamping plate for clamping fixed to workpiece. The utility model can carry out laser calibration and stable clamping fixed operation, and it is convenient to use.

An iron-based alloy composition including: boron (B): 1.6-2.4 wt. %; carbon (C): 2.2-3.0 wt. %; chromium (Cr): 3.5-5.0 wt. %; manganese (Mn): below 0.8 wt. %; molybdenum (Mo): 16.0-19.5 wt. %; nickel (Ni): 1.0-2.0 wt. %; silicon (Si): 0.2-2.0 wt. %; vanadium (V): 10.8-13.2 wt. %; and balanced with iron (Fe). Further, an item including a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.

An iron-based alloy composition including: boron (B): 1.6-2.4 wt. %; carbon (C): 1.7-3.0 wt. %; molybdenum (Mo): 16.0-19.5 wt. %; nickel (Ni): 3.5-6.5 wt. %; manganese (Mn): below 0.8 wt. %; silicon (Si): 0.2-3.0 wt. %; vanadium (V): 10.8-13.2 wt. %; and balanced with iron (Fe). Also, an item including a substrate portion and a hardfacing coating bonded to the substrate portion, wherein the hardfacing coating is made by an overlay welding process using the iron-based alloy composition.

The utility model discloses a kind of pretreatment smooth surfacing wear-resistant lining plate, it is related to wear-resistant lining plate technical field.The utility model includes the substrate steel plate, transition layer, wear-resistant layer and smooth layer sequentially arranged;Smooth layer selects laser remelting smooth layer, and it is nanometer tungsten carbide coating, thickness is 0.3-0.5mm, hardness is HV1800-2200, surface roughness is Ra 0.8-3.2 μm;M7C3 type carbide of nanometer tungsten carbide coating is along material flow direction and is distributed in bundle shape.The utility model is through the gradient design of substrate steel plate-transition layer-wear-resistant layer-smooth layer, realize the synergistic effect of high-strength support, stress buffering, wear-resistant protection and surface optimization;Nanometer tungsten carbide coating cooperates high-chromium cast iron layer, forms double wear-resistant barrier, improves wear-resistant life.

A surface of a tool or other object may have a hardfacing deposit thereon that comprises a hardfacing alloy. Said hardfacing alloy may include: about 0.9 wt%to about 1.5 wt%carbon, about 1.5 wt%to about 2.5 wt%boron, about 0.5 wt%to about 1 wt%manganese, about 0.7 wt%to about 2.2 wt%silicon, about 5.5 wt%to about 8 wt%chromium, about 7 wt%to about 10 wt%niobium, about 0.2 wt%to about 0.7 wt%titanium, about 0.4 wt%to about 0.8 wt%vanadium, 0 wt%to about 0.2 wt%aluminum, 0 wt%to about 0.1 wt%total impurities, and a balance iron, wherein each wt%is based on a total weight of the hardfacing alloy. Examples of tools may include pipe joints, center wear pada, tubing connections, tube bodies, drill collars, stabilizers, earthmoving equipment, and dredging equipment.

The invention relates to the technical field of welding materials, in particular to a hardfacing flux-cored wire for repairing the surface of a single-tooth roller. According to the specific technical scheme, the flux core is prepared from, by mass, 5%-15% of graphite, 20%-60% of high-carbon ferrochrome, 3%-10% of silicon carbide, 2%-15% of tungsten carbide, 1%-6% of electrolytic manganese, 5%-20% of ferromolybdenum and the balance Fe powder. According to the flux-cored wire, surfacing alloy obtained through electric arc surfacing is good in surfacing manufacturability, weld joint forming is attractive, the number of surface air holes is small, and the flux-cored wire further has high hardness and abrasion resistance.

This invention discloses a wear-resistant hardfacing flux-cored welding wire and its preparation method, relating to the field of flux-cored welding wire technology. The flux-cored welding wire prepared by this invention forms hard borides in the cladding metal crystalline matrix, thereby imparting high hardness to the cladding metal. Furthermore, boron carbide is distributed in the weld overlay layer, improving wear resistance. The cladding metal formed by the flux-cored welding wire prepared by this invention has good fluidity and does not require shielding gas during welding, thus saving costs. This invention encapsulates the powdered flux core in a steel shell, improving the corrosion resistance of the welding wire. Through two drawing processes and titanium diffusion treatment, the components are bonded together, the grain size is refined, the hardface quality is improved, and the corrosion resistance and wear resistance of the welding wire are enhanced.

According to the nickel-based alloy material, the surfacing material and the die-casting die, the nickel-based alloy material with good thermal fatigue resistance is provided, so that the safety of the surfacing material and the die-casting die is improved, and the service life of the surfacing material and the die-casting die is prolonged. On the basis of the mass of the nickel-based alloy material, the nickel-based alloy material comprises the following elements in percentage by mass: 70%-75% of Ni element, 15.5%-16.5% of Cr element, 0.030%-0.040% of C element, 0.85%-0.95% of Mo element and the balance of other alloy elements and impurity elements.

This invention relates to a method for preparing a thick, crack-free hardface alloy layer using a stainless steel lattice structure, comprising the following steps: S1 Substrate machining: A 316L stainless steel ingot is machined to the required cylindrical size to obtain the substrate; the surface of the substrate is ground to control the roughness; S2 Laser selective cladding of the lattice structure: A laser selective cladding process is performed on the surface of the substrate using cladding powder, and a lattice structure is printed to obtain the sample; S3 Sheath preparation and installation: A cylindrical steel sheath is prepared, and the sample is installed into the steel sheath; S4 Hardface alloy powder filling: Hardface alloy powder is filled into the lattice structure; S5 Sealing, leak detection, and vacuuming; S6 Hot isostatic pressing; S7 Sheath removal: The sheath is removed by turning, and the material is machined to a suitable size to obtain a thick, crack-free hardface alloy layer. This invention is simple and can significantly improve the service life of the hardface alloy layer and reduce replacement costs.

Disclosed herein are embodiments of nickel-based alloys. The nickel-based alloys can be used as feedstock for PTA and laser cladding hardfacing processes, and can be manufactured into cored wires used to form hardfacing layers. The nickel-based alloys can have high corrosion resistance and large numbers of hard phases such as isolated hypereutectic hard phases.

The application provides a wear-resistant and corrosion-resistant hard-facing alloy welding wire production process. The wear-resistant and corrosion-resistant hard-facing alloy welding wire production process comprises the following steps: S1: precise multi-element micro-alloy proportioning and pretreatment, adopting multi-element compound proportioning of main wear-resistant elements, auxiliary corrosion-resistant elements and refining elements, and selecting high chromium, molybdenum and tungsten as the main wear-resistant elements. The wear-resistant and corrosion-resistant hard-facing alloy welding wire production process provided by the application realizes reasonable cost control, improves the performance of the welding wire by optimizing the proportioning of raw materials, improving the utilization rate of alloy elements and the qualified rate of finished products, reasonably controls the production cost, enhances the market competitiveness of the product, is suitable for a wide range of applications, can be used for surfacing repair and surface strengthening of various substrates, covers multiple downstream industries, and is mature in process, low in equipment investment cost, does not need large-scale modification of the existing production line, is easy to realize large-scale popularization, and promotes the technical upgrading and industrial development of the hard-facing alloy welding wire industry.

This process of adding filler material to a hardfacing part comprises the following steps: - Machining a notch (13) in a surface (15) of a workpiece (17); - Performing a first hardfacing pass (19) on the workpiece (17), the first end (23) of which is located inside the notch (13); and - Forming a second hardfacing pass (27) on the workpiece (17), covering the first end (23) of the first hardfacing pass (19), the second hardfacing pass (27) being in contact on one side with the surface (15) of the workpiece (17) and on the other side with the first hardfacing pass (19). Figure for the abbreviation: Fig. 3

A method for manufacturing welding or cladding rods whose filler material is a metallic superalloy. One aspect of the invention relates to a method for manufacturing cladding or welding rods, characterized in that it comprises the following successive steps: a step (E1) of supplying a mixture comprising 50 to 90% by volume of a powder of a metallic superalloy based on nickel and / or cobalt, and a powder of a binder based on wax and / or thermoplastic polymer; a step (E2) of forming a mixture wire from the mixture resulting from step (E1), this wire being designated as the "green" wire; a step (E3) of debinding the "green" wire resulting from step (E2) and obtaining a debinded wire designated as the "brown" wire; a step (E4) of sintering the "brown" wire resulting from step (E3) and obtaining a sintered wire usable as a cladding rod. or welding. Figure to be published with the abbreviation: Figure 3

The present invention belongs to the technical field of hot straightening work rolls, and in particular relates to hot straightening work rolls and methods for their manufacture. The work roll comprises a cylinder I providing a working area and a second cylinder coaxially disposed at both ends of cylinder I. Cylinder I comprises a roll body, which includes a base layer formed at least partially by overlay welding and a hardfacing layer. The present invention utilizes a multi-layered structure for the main body of the roll, such as the roll body. The base layer is made of a tough material, the surface is provided with a high-hardness hardfacing layer, and the inner lining of the roll is made of a tough material, including one or more of carbon steel and 42 chromium-molybdenum. This design achieves excellent impact absorption, is less susceptible to rebound, has strong resistance to impact damage, and exhibits excellent stability, thereby preventing cracking caused by stress generated by temperature differences between the surface and interior of the roll body.

The present application relates to a kind of nickel-based hardfacing alloy layer defect healing method, comprising the following steps: S1 cleaning sample: the nickel-based hardfacing alloy layer sample with defect is washed, and the dirt on the surface of sample is removed;S2 vacuumizing: the nickel-based hardfacing alloy layer sample with defect is placed into high vacuum furnace, and vacuumizing is prepared for test;S3 heating, heat preservation: according to test scheme, the sample is heated to corresponding temperature, and heat preservation is carried out;S4 cooling: after test, the sample is cooled to room temperature with high vacuum furnace, and vacuum is broken, and the sample is taken out and observed defect healing condition.The whole repair process of the present application is simple, does not need additional mechanical processing process, the requirement of equipment is low, cost is low, and defect repair efficiency is high.

The application discloses a cast iron mold surfacing flux-cored electrode and a preparation method thereof, and relates to the technical field of electric welding materials. The cast iron mold surfacing flux-cored electrode comprises a tube body, a flux core filled in the tube body and a coating wrapping the tube body. The components of the flux core and the coating are selected, so that a surfacing weld with good crack resistance, brittleness resistance and strong impact wear resistance performance can be formed on an FC300 imported automobile cast iron mold, the hardness of the welding layer meets the use requirement, and the mold after surfacing repair by using the electric welding strip has a longer service life.

The present application relates to the technical field of surfacing, in particular to a hard surface layer crack sealing method, comprising: surface treatment of the hard surface layer; laying wear-resistant powder on the surface of the hard surface layer, and transferring at least part of the wear-resistant powder to the inside of the stress release crack formed on the surface of the hard surface layer; removing the excess wear-resistant powder, the wear-resistant powder comprising high-carbon chromium iron powder; adding a curing liquid to the surface of the hard surface layer, so that at least part of the curing liquid penetrates into the stress release crack, the viscosity of the curing liquid being any value in the range from 1 mPa.s to 1000 mPa.s; after removing the excess curing liquid, allowing the curing liquid to solidify to form a sealing material. The method of filling powder first and then penetrating can effectively improve the bonding force of the sealing material and the hard surface layer, and reduce the risk of corrosion medium penetration and sealing material falling off.

A surface of a tool or other object may have a hardfacing deposit thereon that includes a hardfacing alloy. The hardfacing alloy may include: from about 0.75 wt% to about 0.95 wt% of carbon, from about 2.3 wt% to about 2.8 wt% of boron, from 0 wt% to about 0.5 wt% of manganese, from 0 wt% to about 0.7 wt% of silicon, from about 6.5 wt% to about 7 wt% of chromium, from about 3 wt% to about 3.9 wt% of niobium, and the balance of aluminum. From 0 wt% to about 0.25 wt% cumulatively of one or more of scandium, titanium, vanadium, cobalt, nickel, copper, zinc, gallium, and aluminum, from 0 wt% to about 0.08 wt% nitrogen, from 0 wt% to about 0.05 wt% total impurities, and the balance iron, where each wt% is based on the total weight of the hardfacing alloy. Examples of tools may include a drill pipe joint, a central wear pad, a work column pipe upset connector, a pipe body, a drill collar, a stabilizer, an earth moving apparatus, and a dredging apparatus.

The invention relates to a method for repairing a tool insert (1) for forging by stamping, the insert comprising a portion to be repaired having an outer surface (S1) having a first geometric profile, the method comprising: a step of removing the portion to be repaired from the rest of the insert and forming an attachment seat (3) on the rest of the insert, the attachment seat (3) comprising an outer surface (S3) formed by a central zone (3a) and a peripheral zone (3b) which extends gradually from the central zone (3a) to the outer surface (S2) of the rest of the insert; and a step of hardfacing by additive manufacturing by laser metal deposition on the attachment seat (3) for the removed portion to be repaired.

The application relates to the technical field of corrosion-resistant alloy coating, in particular to a low-heat semi-solid surfacing process and application thereof, which comprises the following steps: using a plasma transferred arc surfacing gun with a double-gas channel, one channel is used for spraying low-heat semi-solid surfacing coating material, and the low-heat semi-solid surfacing coating material is heated to 6800-7800 DEG C through an ion source and is sprayed to the surface of a base material in a state of being protected by inert gas, and is scattered on the surface of the base material at an incident angle of 60-75 DEG; meanwhile, the other gas channel of the plasma transferred arc surfacing gun sprays alloy pellets to perform surfacing shot blasting, and a high-dense, continuous and uniform surfacing layer is formed on the surface of the base material; the low-heat semi-solid surfacing process has the advantages that the high-temperature corrosion resistance of the surface coating of important equipment such as thermal power, nuclear power, ocean, national defense and military industry can be improved.

A method for formation of hardfacings on an article comprises producing, by powder metallurgy or additive manufacturing, an article having a discontinuous surface. The article is exposed to impact items and to tungsten carbide particles, provided as tungsten carbide particles comprised in the impact items and / or tungsten particles provided directly in a process fluid as a dispersion. At least 80% of the tungsten carbide particles have particle sizes within the range of 0.1-5 μm. The impact items are bodies with an average diameter within the range of 0.1 to 10 mm. A velocity difference is created between the surfaces and the impact items, causing impacts between the impact items and the surfaces, giving polishing, induction of compressive stress, and / or densification of the surface. Tungsten carbide particles are embedded, hammering the tungsten carbide particles into the article by use of the energy of the impacts.

The invention relates to a hardfacing welding wire and a preparation method thereof.The hardfacing welding wire comprises a welding wire body, a steel belt layer, a fixing layer and an anti-oxidation layer, the welding wire body, the steel belt layer, the fixing layer and the anti-oxidation layer are sequentially distributed from inside to outside, and the welding wire body comprises a slag layer, an iron sheet layer and an iron powder layer which are sequentially distributed from inside to outside; the iron powder layer comprises a plurality of baffle rings which are distributed at intervals in the length direction of the welding wire body, the baffle rings are fixedly arranged on the iron sheet layer in a sleeving mode, the inner circumferential walls of the baffle rings are attached to the outer circumferential wall of the iron sheet layer in a sealed mode, the outer circumferential walls of the baffle rings are attached to the inner circumferential wall of the steel belt layer in a sealed mode, and the space between every two adjacent baffle rings is filled with iron powder. After the end of the welding wire is damaged, exposed iron powder leaks, the iron powder located on the side, away from the damaged end of the welding wire, of the baffle ring plays a role in isolating through the baffle ring, therefore, more iron powder is prevented from leaking, the leakage amount of the iron powder inside the welding wire after the end of the welding wire is damaged is reduced, and normal use of the welding wire is guaranteed.

The invention relates to the technical field of welding machining supporting mechanisms, in particular to a double-metal corrosion-resistant surfacing pipe welding machining supporting mechanism and an operation method.The double-metal corrosion-resistant surfacing pipe welding machining supporting mechanism comprises a surfacing pipe supporting base, the two ends of the surfacing pipe supporting base are fixedly connected with connecting boxes correspondingly, and a containing groove is formed in the inner side of the surfacing pipe supporting base; and a top cover sealing plate is movably mounted on the inner side of the storage groove. According to the supporting mechanism, by adopting structural optimization of the top cover sealing plate, installation of the guide abutting assembly and the bottom supporting assembly can be met, height adjustment of the guide abutting assembly and the bottom supporting assembly can also be met, different machining requirements can be met conveniently, it is ensured that an upper notch of a storage groove is compensated during recycling, and rapid recycling is met; through horizontal movement of the guide wheel mounting frame on the swing arm plate, the limiting requirements of the surfacing pipes with different diameters can be met, and through arrangement of the bottom supporting assembly, the surfacing pipes can be supported, and vertical downward impact and vibration of the surfacing pipes in the welding process can be weakened.

A hardfacing metal composition and method of restoring worn work string tubing by application of a hardfacing metal to the worn regions of the work string tubing.

A hardfacing metal composition and method of restoring worn work string tubing by application of a hardfacing metal to the worn regions of the work string tubing.