CN114571127B - Welding wire for surfacing of composite carbide reinforced scraping plate and preparation method - Google Patents
Welding wire for surfacing of composite carbide reinforced scraping plate and preparation method Download PDFInfo
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- CN114571127B CN114571127B CN202210326604.XA CN202210326604A CN114571127B CN 114571127 B CN114571127 B CN 114571127B CN 202210326604 A CN202210326604 A CN 202210326604A CN 114571127 B CN114571127 B CN 114571127B
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- 238000003466 welding Methods 0.000 title claims abstract description 83
- 238000007790 scraping Methods 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 154
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 19
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 18
- 230000004907 flux Effects 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 50
- 238000010438 heat treatment Methods 0.000 claims description 48
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 20
- 238000004321 preservation Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000011229 interlayer Substances 0.000 claims description 10
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 9
- 239000002932 luster Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 238000009461 vacuum packaging Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 238000005491 wire drawing Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 16
- 229910052720 vanadium Inorganic materials 0.000 abstract description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 5
- 229910052748 manganese Inorganic materials 0.000 abstract description 5
- 239000000306 component Substances 0.000 description 25
- 239000003245 coal Substances 0.000 description 15
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005552 hardfacing Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a welding wire for overlaying a composite carbide reinforced scraper, which comprises a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 1 to 2 percent of graphene, 0.5 to 0.7 percent of Si powder, 1 to 3 percent of Mn powder, 60 to 65 percent of Cr powder, 2 to 3 percent of V powder, 2 to 3 percent of B powder, 2 to 3 percent of Ti powder and CeO 2 1-2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%. The welding wire is specially used for arc surfacing repair remanufacturing of the mining scraping plate, can meet the continuous service requirement, and can obviously reduce the production cost. Also provides a preparation method of the welding wire for the composite carbide reinforced scraper overlaying and a preparation method of the composite carbide reinforced scraper overlaying layer.
Description
Technical Field
The invention belongs to the field of metal materials, and particularly relates to a welding wire for composite carbide reinforced scraper overlaying, a preparation method of the welding wire for composite carbide reinforced scraper overlaying and a preparation method of a composite carbide reinforced scraper overlaying layer.
Background
Along with the rapid development of modern industry and high-tech technology in China, the demand for mineral resources is continuously increased, and the development trend of products manufactured by mining machinery is towards the high-efficiency and environment-friendly remanufacturing direction. In the coal industry, the whole coal mining working face is finished by means of close cooperative cooperation among three coal mines (a coal mining machine, a scraper conveyor and a whole set of hydraulic supports), and the whole coal mining processes of coal mining, coal receiving, coal loading and coal conveying are finished together. The scraper conveyor is key pivot equipment of the fully-mechanized coal face of the whole coal mine, is responsible for conveying coal blocks and materials of the fully-mechanized coal face, plays a role of a joint pivot of the three-machine equipment, and can directly influence the production capacity and the coal mining efficiency of the fully-mechanized coal face if the scraper conveyor runs normally.
The scraper blade is used as the core component of the scraper conveyor, has high work load and severe use environment, is easy to wear in the use process, influences the use effect, and cannot be used continuously if the wear amount exceeds a certain degree.
Disclosure of Invention
The invention provides a welding wire for overlaying welding of a composite carbide reinforced scraper, which is specially used for arc overlaying repair and remanufacturing of a mining scraper, can meet the requirement of continuous service, and can also remarkably reduce the production cost.
The second object of the invention is to provide a method for preparing the welding wire for the composite carbide reinforced scraper overlaying.
The third object of the invention is to provide a method for preparing a composite carbide reinforced scraping plate surfacing layer.
The first technical scheme adopted by the invention is that the welding wire for overlaying welding of the composite carbide reinforced scraping plate comprises a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 1 to 2 percent of graphene, 0.5 to 0.7 percent of Si powder, 1 to 3 percent of Mn powder, 60 to 65 percent of Cr powder, 2 to 3 percent of V powder, 2 to 3 percent of B powder, 2 to 3 percent of Ti powder and CeO 2 1-2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%.
The present invention is also characterized in that,
the welding skin is a low-carbon steel strip, the thickness is 0.3mm, and the width is 7mm.
The filling amount of the flux-cored wire is controlled to be 30-33 wt%.
The second technical scheme adopted by the invention is that the preparation method of the welding wire for the surfacing of the composite carbide reinforced scraping plate is characterized by comprising the following specific steps:
step 1: the following medicines are respectively weighed according to mass percentPowder: 1 to 2 percent of graphene, 0.5 to 0.7 percent of Si powder, 1 to 3 percent of Mn powder, 60 to 65 percent of Cr powder, 2 to 3 percent of V powder, 2 to 3 percent of B powder, 2 to 3 percent of Ti powder and CeO 2 1-2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%.
Step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 180-200 ℃ for 1-3 h; the dried powder is placed in a powder mixer for full mixing for 1-3 h;
step 3: removing grease on the surface of a low-carbon steel belt by adopting low-carbon steel belts as welding skin and adopting alcohol, wrapping the medicinal powder prepared in the step 2 in the low-carbon steel belt by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6mm;
step 4: after the first procedure is finished, the aperture of the die is sequentially reduced, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
step 5: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby.
The present invention is also characterized in that,
in the step 3, the thickness of the low-carbon steel belt is 0.3mm, and the width is 7mm.
In the step 3, the filling amount of the flux-cored wire is controlled to be 30-33 wt%.
The third technical scheme adopted by the invention is that the preparation method of the composite carbide reinforced scraping plate surfacing layer is characterized by comprising the following specific steps:
(1) Polishing the area to be repaired of the surface of the failure scraping plate by using an angle grinder to expose the metallic luster;
(2) Preheating the scraping plate to 250-300 ℃ by oxyacetylene flame;
(3) The composite carbide reinforced scraping plate surfacing welding wire is adopted to carry out surfacing welding on the surface of the scraping plate, the welding current is 150-180A, the shielding gas is mixed gas, and the thickness of a surfacing layer is 2-5mm; the interlayer temperature is controlled between 230 ℃ and 250 ℃ during overlaying.
(4) And heating the surfacing layer by adopting high-frequency induction heating equipment, wherein the heating temperature is 800-850 ℃, the heat preservation time is 1-3 min, and water quenching treatment is carried out after the heat preservation is finished.
The present invention is also characterized in that,
the mixed gas consists of the following components in percentage by volume: 80% Ar,20% CO 2 The sum of the volume percentages of the components is 100 percent.
The beneficial effects of the invention are as follows:
(1) According to the invention, through a welding wire alloy system with reasonable design, the wear resistance of the scraping plate is improved: cr, V, B, ti and graphene are added, and multiple MC and M are generated in situ 7 C 3 And (3) carbide, so as to strengthen the surfacing layer. The strengthening effect of the composite carbide can make up the defect brought by strengthening the single carbide, and the strengthening effect has the characteristics of multiple layers and meets the requirement of complex working conditions of the scraper blade.
(2) The nano CeO is added to the welding wire 2 Refining primary carbide, improving primary carbide distribution, and effectively improving hardness and bending strength of the surfacing layer. At the same time, nano-sized CeO 2 The reactivity is larger, and the friction performance of the surfacing layer can be obviously improved by adding the surfacing layer.
(3) The welding wire disclosed by the invention is matched with the subsequent local induction heat treatment, so that the final hardening treatment of the surfacing layer is realized.
(4) The method of the invention selects lower heat input when carrying out the resurfacing welding remanufacturing of the scraping plate, and effectively reduces the dilution rate between layers, thereby ensuring higher quality of the resurfacing welding layer.
(5) When the method is used for carrying out surface overlaying of the scraping plate, the preheating temperature and the interlayer temperature of the scraping plate are strictly controlled, so that the excellent combination property of the overlaying layer and the matrix is ensured, and the generation of cracking is reduced.
(6) The welding wire developed by the method has few types of powder and is convenient for large-scale production. The wire diameter of the welding wire is 1.2mm, so that MIG welding can be performed, TIG welding can also be performed, and the adaptability is wide.
(7) Aiming at the problem that the size of the mining scraper cannot meet the use requirement due to abrasion caused by easy service of the mining scraper in a severe environment, the invention provides a scraper repair method by adopting a build-up welding remanufacturing technology. The matched welding material special for the scraping plate is developed, so that the service life and performance of mining equipment and parts are prolonged, and the reutilization of waste parts is realized.
Drawings
FIG. 1 is a diagram of a macro topography of a screed surface layer prepared in example 2 of the method of the present invention;
FIG. 2 is a metallographic structure diagram of a scratch board build-up welding layer prepared in embodiment 2 of the method of the invention;
FIG. 3 is a graph showing the frictional wear profile of the hardfacing layer of the wiper blade prepared in example 2 of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention provides a welding wire for surfacing of a composite carbide reinforced scraper, which comprises a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 1 to 2 percent of graphene, 0.5 to 0.7 percent of Si powder, 1 to 3 percent of Mn powder, 60 to 65 percent of Cr powder, 2 to 3 percent of V powder, 2 to 3 percent of B powder, 2 to 3 percent of Ti powder and CeO 2 1-2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%.
The granularity of Si powder, mn powder, cr powder and B powder is 200-300 meshes, the granularity of the graphene is 10 mu m, and the granularity of CeO is 10 mu m 2 The particle size is 100nm, and the purity of the powder is more than or equal to 99.90 percent; the welding skin is a low-carbon steel strip, the thickness is 0.3mm, and the width is 7mm.
The filling amount of the flux-cored wire is controlled to be 30-33 wt%.
The invention also provides a preparation method of the welding wire for surfacing of the composite carbide reinforced scraper, which comprises the following specific steps:
step 1: the following medicinal powder is respectively weighed according to the mass percentage: 1 to 2 percent of graphene, 0.5 to 0.7 percent of Si powder, 1 to 3 percent of Mn powder, 60 to 65 percent of Cr powder, 2 to 3 percent of V powder, 2 to 3 percent of B powder, 2 to 3 percent of Ti powder and CeO 2 1-2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%.
Step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 180-200 ℃ for 1-3 hours to remove crystal water in the powder; the dried powder is placed in a powder mixer for full mixing for 1-3 h;
step 3: removing grease on the surface of a low-carbon steel belt by adopting low-carbon steel belts as welding skin and adopting alcohol, wrapping the medicinal powder prepared in the step 2 in the low-carbon steel belt by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6mm;
step 4: after the first procedure is finished, the aperture of the die is sequentially reduced, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
step 5: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby.
In the step 3, the thickness of the low-carbon steel belt is 0.3mm, and the width is 7mm.
In the step 3, the filling amount of the flux-cored wire is controlled to be 30-33 wt%.
The invention also provides a preparation method of the composite carbide reinforced scraper surfacing layer, which comprises the following specific steps:
(1) Polishing the area to be repaired of the surface of the failure scraping plate by using an angle grinder to expose the metallic luster;
(2) Preheating the scraping plate to 250-300 ℃ by oxyacetylene flame;
(3) The composite carbide reinforced welding wire for the scraper surface surfacing is adopted for the scraper surface surfacing, the welding current is 150-180A, the shielding gas is a mixed gas, and the mixed gas comprises the following components in percentage by volume: 80% Ar,20% CO 2 The sum of the volume percentages of the components is 100 percent, and the thickness of the surfacing layer is 2-5mm; the interlayer temperature is controlled between 230 ℃ and 250 ℃ during overlaying.
(4) And (3) carrying out local heat treatment on the scraping plate after the build-up welding, heating the build-up welding layer by adopting high-frequency induction heating equipment, wherein the heating temperature is 800-850 ℃, the heat preservation time is 1-3 min, and carrying out water quenching treatment after the heat preservation is finished.
Example 1
Step 1: the medicinal powder is respectively weighed according to the mass percentage: 1% of graphene, 0.5% of Si powder, 1% of Mn powder, 60% of Cr powder, 2% of V powder, 2% of B powder, 2% of Ti powder and CeO 2 Powder 1%The balance of Fe powder, wherein the sum of the mass percentages of the components is 100 percent.
Wherein the granularity of Si powder, mn powder, cr powder and B powder is 200 meshes, the granularity of the graphene is 10 mu m, and the granularity of CeO is 10 mu m 2 The particle size is 100nm, and the purity of the powder is more than or equal to 99.90 percent;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 180 ℃ for 1h to remove crystal water in the powder; placing the dried medicinal powder into a powder mixer for full mixing for 1h;
step 3: removing grease on the surface of a low-carbon steel belt by adopting low-carbon steel belts as welding skin and adopting alcohol, wrapping the medicinal powder prepared in the step 2 in the low-carbon steel belt by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6mm;
in the step 3, the thickness of the low-carbon steel belt is 0.3mm, and the width is 7mm.
In the step 3, the filling amount of the flux-cored wire is controlled to be 30wt%.
Step 4: after the first procedure is finished, the aperture of the die is sequentially reduced, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
step 5: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby.
The welding wire prepared in the embodiment 1 is used for preparing a mining scraping plate surfacing layer, and the specific steps are as follows:
(1) And polishing the area to be repaired of the surface of the failure scraping plate by using an angle grinder to expose the metallic luster.
(2) Preheating the scraper to 250 ℃ by oxyacetylene flame;
(3) The invention discloses a scraper blade connecting layer low-carbon welding wire for overlaying the surface of a scraper blade, wherein the welding current is 150-180A, the shielding gas is mixed gas, and the mixed gas comprises the following components in percentage by volume: 80% Ar,20% CO 2 The sum of the volume percentages of the components is 100%, the thickness of the surfacing layer is 2mm, and the interlayer temperature is controlled at 230 ℃ during surfacing.
(4) And (3) carrying out local heat treatment on the scraping plate after the build-up welding, heating the build-up welding layer by adopting high-frequency induction heating equipment, wherein the heating temperature is 800 ℃, the heat preservation time is 1min, and carrying out water quenching treatment after the heat preservation is finished.
The hardness of the surface overlaying layer of the scraping plate is 55HRC through testing;
the acquisition cost of a new scraper is saved by about 15% through scraper repair;
the scraper blade is continuously in service for 7 months after repair.
Example 2
Step 1: the medicinal powder is respectively weighed according to the mass percentage: 2% of graphene, 0.7% of Si powder, 3% of Mn powder, 65% of Cr powder, 3% of V powder, 3% of B powder, 3% of Ti powder and CeO 2 2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%.
Wherein the granularity of Si powder, mn powder, cr powder and B powder is 200 meshes, the granularity of the graphene is 10 mu m, and the granularity of CeO is 10 mu m 2 The particle size is 100nm, and the purity of the powder is more than or equal to 99.90 percent;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 200 ℃ for 3 hours to remove crystal water in the powder; placing the dried medicinal powder into a powder mixer for full mixing for 3 hours;
step 3: removing grease on the surface of a low-carbon steel belt by adopting low-carbon steel belts as welding skin and adopting alcohol, wrapping the medicinal powder prepared in the step 2 in the low-carbon steel belt by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6mm;
in the step 3, the thickness of the low-carbon steel belt is 0.3mm, and the width is 7mm.
In the step 3, the flux-cored wire filling amount is controlled at 33wt%.
Step 4: after the first procedure is finished, the aperture of the die is sequentially reduced, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
step 5: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby.
The welding wire prepared in the embodiment 2 is used for preparing a mining scraping plate surfacing layer, and the specific steps are as follows:
(1) And polishing the area to be repaired of the surface of the failure scraping plate by using an angle grinder to expose the metallic luster.
(2) Preheating the scraper to 300 ℃ by oxyacetylene flame;
(3) The invention discloses a scraper blade connecting layer low-carbon welding wire for overlaying the surface of a scraper blade, wherein the welding current is 150-180A, the shielding gas is mixed gas, and the mixed gas comprises the following components in percentage by volume: 80% Ar,20% CO 2 The sum of the volume percentages of the components is 100%, the thickness of the surfacing layer is 5mm, and the interlayer temperature is controlled at 250 ℃ during surfacing.
(4) And (3) carrying out local heat treatment on the scraping plate after the build-up welding, heating the build-up welding layer by adopting high-frequency induction heating equipment, wherein the heating temperature is 850 ℃, the heat preservation time is 3min, and carrying out water quenching treatment after the heat preservation is finished.
The hardness of the surface overlaying layer of the scraping plate is 54HRC through testing;
the acquisition cost of a new scraper is saved by about 15% through scraper repair;
the scraper blade is continuously in service for 8 months after repair.
FIG. 1 is a macro-topography of a screed surface layer prepared in accordance with example 2 of the present method. As can be seen from the figure, although the carbon content of the welding wire is high, the surface is well formed after surfacing, and no cracking occurs.
FIG. 2 is a metallographic structure diagram of the scratch pad layer prepared in embodiment 2 of the method of the invention. It can be seen from the figure that the weld is mainly martensitic due to the higher carbon content of the wire and that a needle-like martensitic structure is visible.
FIG. 3 is a graph showing the frictional wear profile of the hardfacing layer of the wiper blade prepared in example 2 of the present invention. As can be seen from the figure, the surface of the surfacing has excellent wear resistance, the wear amount is good, and the adhesion wear mainly occurs.
Example 3
Step 1: the medicinal powder is respectively weighed according to the mass percentage: 1.5% of graphene, 0.6% of Si powder, 2% of Mn powder, 63% of Cr powder, 2.5% of V powder, 2.5% of B powder, 2.5% of Ti powder and CeO 2 1.5 percent of powder,the balance of Fe powder, wherein the sum of the mass percentages of the components is 100 percent.
Wherein the granularity of Si powder, mn powder, cr powder and B powder is 250 meshes, the granularity of the graphene is 10 mu m, and the granularity of CeO is 10 mu m 2 The particle size is 100nm, and the purity of the powder is more than or equal to 99.90 percent;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 190 ℃ for 2 hours to remove crystal water in the powder; placing the dried medicinal powder into a powder mixer for full mixing for 2 hours;
step 3: removing grease on the surface of a low-carbon steel belt by adopting low-carbon steel belts as welding skin and adopting alcohol, wrapping the medicinal powder prepared in the step 2 in the low-carbon steel belt by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6mm;
in the step 3, the thickness of the low-carbon steel belt is 0.3mm, and the width is 7mm.
In the step 3, the flux-cored wire filling amount is controlled at 32wt%.
Step 4: after the first procedure is finished, the aperture of the die is sequentially reduced, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
step 5: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby.
The welding wire prepared in the embodiment 3 is used for preparing a mining scraping plate surfacing layer, and the specific steps are as follows:
(1) And polishing the area to be repaired of the surface of the failure scraping plate by using an angle grinder to expose the metallic luster.
(2) Preheating the scraper to 270 ℃ by oxyacetylene flame;
(3) The invention discloses a scraper blade connecting layer low-carbon welding wire for overlaying the surface of a scraper blade, wherein the welding current is 150-180A, the shielding gas is mixed gas, and the mixed gas comprises the following components in percentage by volume: 80% Ar,20% CO 2 The sum of the volume percentages of the components is 100 percent, the thickness of the surfacing layer is 3mm, and the interlayer temperature is controlled at 240 ℃ during surfacing.
(4) And (3) carrying out local heat treatment on the scraping plate after the build-up welding, heating the build-up welding layer by adopting high-frequency induction heating equipment, wherein the heating temperature is 830 ℃, the heat preservation time is 2min, and carrying out water quenching treatment after the heat preservation is finished.
The hardness of the surface overlaying layer of the scraping plate is 52HRC through testing;
the acquisition cost of a new scraper is saved by about 15% through scraper repair;
the scraper blade is continued to be in service for 8.5 months after repair.
Example 4
Step 1: the medicinal powder is respectively weighed according to the mass percentage: 1.2% of graphene, 0.65% of Si powder, 1.3% of Mn powder, 62% of Cr powder, 2.3% of V powder, 2.3% of B powder, 2.3% of Ti powder and CeO 2 1.2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%.
Wherein the granularity of Si powder, mn powder, cr powder and B powder is 200 meshes, the granularity of the graphene is 10 mu m, and the granularity of CeO is 10 mu m 2 The particle size is 100nm, and the purity of the powder is more than or equal to 99.90 percent;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 185 ℃ for 1.3 hours to remove crystal water in the powder; placing the dried medicinal powder into a powder mixer for full mixing for 1.3 hours;
step 3: removing grease on the surface of a low-carbon steel belt by adopting low-carbon steel belts as welding skin and adopting alcohol, wrapping the medicinal powder prepared in the step 2 in the low-carbon steel belt by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6mm;
in the step 3, the thickness of the low-carbon steel belt is 0.3mm, and the width is 7mm.
In the step 3, the flux-cored wire filling amount is controlled at 32wt%.
Step 4: after the first procedure is finished, the aperture of the die is sequentially reduced, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
step 5: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby.
The welding wire prepared in the embodiment 4 is used for preparing a mining scraping plate surfacing layer, and the specific steps are as follows:
(1) And polishing the area to be repaired of the surface of the failure scraping plate by using an angle grinder to expose the metallic luster.
(2) Preheating the scraping plate to 255 ℃ by oxyacetylene flame;
(3) The invention discloses a scraper blade connecting layer low-carbon welding wire for overlaying the surface of a scraper blade, wherein the welding current is 150-180A, the shielding gas is mixed gas, and the mixed gas comprises the following components in percentage by volume: 80% Ar,20% CO 2 The sum of the volume percentages of the components is 100 percent, the thickness of the surfacing layer is 4mm, and the interlayer temperature is controlled at 235 ℃ during surfacing.
(4) And (3) carrying out local heat treatment on the scraping plate after the build-up welding, heating the build-up welding layer by adopting high-frequency induction heating equipment, wherein the heating temperature is 810 ℃, the heat preservation time is 1 to 3min, and carrying out water quenching treatment after the heat preservation is finished.
The hardness of the surface overlaying layer of the scraping plate is 51HRC through testing;
the acquisition cost of a new scraper is saved by about 15% through scraper repair;
the scraper blade is continuously in service for 9 months after repair.
Example 5
Step 1: the medicinal powder is respectively weighed according to the mass percentage: 1.3% of graphene, 0.69% of Si powder, 2.9% of Mn powder, 64% of Cr powder, 2.7% of V powder, 2.1% of B powder, 2.4% of Ti powder and CeO 2 1.9% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%.
Wherein the granularity of Si powder, mn powder, cr powder and B powder is 200 meshes, the granularity of the graphene is 10 mu m, and the granularity of CeO is 10 mu m 2 The particle size is 100nm, and the purity of the powder is more than or equal to 99.90 percent;
step 2: heating the powder weighed in the step 1 in a vacuum heating furnace at 188 ℃ for 2.7 hours to remove crystal water in the powder; placing the dried medicinal powder into a powder mixer for full mixing, wherein the mixing time is 2.9h;
step 3: removing grease on the surface of a low-carbon steel belt by adopting low-carbon steel belts as welding skin and adopting alcohol, wrapping the medicinal powder prepared in the step 2 in the low-carbon steel belt by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6mm;
in the step 3, the thickness of the low-carbon steel belt is 0.3mm, and the width is 7mm.
In the step 3, the filling amount of the flux-cored wire is controlled to be 30wt%.
Step 4: after the first procedure is finished, the aperture of the die is sequentially reduced, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
step 5: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby.
The welding wire prepared in the embodiment 5 is used for preparing a mining scraping plate surfacing layer, and the specific steps are as follows:
(1) And polishing the area to be repaired of the surface of the failure scraping plate by using an angle grinder to expose the metallic luster.
(2) Preheating the scraper to 290 ℃ by oxyacetylene flame;
(3) The invention discloses a scraper blade connecting layer low-carbon welding wire for overlaying the surface of a scraper blade, wherein the welding current is 150-180A, the shielding gas is mixed gas, and the mixed gas comprises the following components in percentage by volume: 80% Ar,20% CO 2 The sum of the volume percentages of the components is 100%, the thickness of the build-up layer is 4mm, and the thickness of the build-up layer is determined according to the actual wear thickness. The interlayer temperature is controlled at 245 ℃ during the overlaying.
(4) And (3) carrying out local heat treatment on the scraping plate after the build-up welding, heating the build-up welding layer by adopting high-frequency induction heating equipment, wherein the heating temperature is 845 ℃, the heat preservation time is 2.4min, and carrying out water quenching treatment after the heat preservation is finished.
The hardness of the surface overlaying layer of the scraping plate is 65HRC through testing;
the acquisition cost of a new scraper is saved by about 15% through scraper repair;
the scraper blade is continuously in service for 8 months after repair.
Claims (3)
1. The welding wire for the composite carbide reinforced scraper surfacing is characterized by comprising a flux core and a welding skin, wherein the flux core is formed by the following steps ofThe weight percentage of the material is as follows: 1-2% of graphene, 0.5-0.7% of Si powder, 1-3% of Mn powder, 60-65% of Cr powder, 2-3% of V powder, 2-3% of B powder, 2-3% of Ti powder and CeO 2 1-2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%; the welding skin is a low-carbon steel strip, the thickness is 0.3mm, and the width is 7mm; the filling amount of the flux-cored wire is controlled to be 32-33 wt%;
when the welding wire for overlaying the composite carbide reinforced scraping plate is adopted to carry out overlaying on the surface of the scraping plate, firstly, an angle grinder is used for polishing the area to be repaired on the surface of the failure scraping plate, so that the area to be repaired is exposed out of metallic luster; then preheating a scraper to 250-300 ℃ by oxyacetylene flame; then, overlaying the surface of the scraper by adopting the welding wire for overlaying the composite carbide reinforced scraper, wherein the welding current is 150-180A, the shielding gas is mixed gas, and the thickness of an overlaying layer is 2-5mm; the interlayer temperature is controlled at 230-250 ℃ during overlaying.
2. The method for producing a welding wire for composite carbide reinforced screed build-up welding according to claim 1, characterized by comprising the specific steps of:
step 1: the following medicinal powder is respectively weighed according to the mass percentage: 1-2% of graphene, 0.5-0.7% of Si powder, 1-3% of Mn powder, 60-65% of Cr powder, 2-3% of V powder, 2-3% of B powder, 2-3% of Ti powder and CeO 2 1-2% of powder, and the balance of Fe powder, wherein the sum of the mass percentages of the components is 100%;
step 2: placing the powder weighed in the step 1 into a vacuum heating furnace for heating, wherein the heating temperature is 180-200 ℃, and the heat preservation time is 1-3 hours; placing the dried medicinal powder into a powder mixer for full mixing for 1-3 hours;
step 3: removing grease on the surface of a low-carbon steel belt by adopting low-carbon steel belts as welding skin and adopting alcohol, wrapping the medicinal powder prepared in the step 2 in the low-carbon steel belt by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6mm; in the step 3, the thickness of the low-carbon steel belt is 0.3mm, and the width is 7mm; in the step 3, the filling amount of the flux-cored wire is controlled to be 32-33wt%;
step 4: after the first procedure is finished, the aperture of the die is sequentially reduced, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
step 5: after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for standby.
3. The preparation method of the composite carbide reinforced scraper surfacing layer is characterized by comprising the following specific steps:
(1) Polishing the area to be repaired of the surface of the failure scraping plate by using an angle grinder to expose the metallic luster;
(2) Preheating a scraper to 250-300 ℃ by oxyacetylene flame;
(3) The welding wire for overlaying the composite carbide reinforced scraping plate is adopted to conduct overlaying on the surface of the scraping plate, the welding current is 150-180A, the shielding gas is mixed gas, and the thickness of an overlaying layer is 2-5mm; the interlayer temperature is controlled at 230-250 ℃ during overlaying;
(4) Heating the surfacing layer by adopting high-frequency induction heating equipment, wherein the heating temperature is 800-850 ℃, the heat preservation time is 1-3 min, and water quenching treatment is carried out after the heat preservation is finished;
the mixed gas consists of the following components in percentage by volume: 80% Ar,20% CO 2 The sum of the volume percentages of the components is 100 percent.
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