CN113600972A - Surfacing repair method - Google Patents
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- CN113600972A CN113600972A CN202110965633.6A CN202110965633A CN113600972A CN 113600972 A CN113600972 A CN 113600972A CN 202110965633 A CN202110965633 A CN 202110965633A CN 113600972 A CN113600972 A CN 113600972A
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- wear
- layer
- resistant part
- welding
- resistant
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000008439 repair process Effects 0.000 title claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 65
- 239000003595 mist Substances 0.000 claims abstract description 27
- 230000001681 protective effect Effects 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 36
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 229910001018 Cast iron Inorganic materials 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 239000011651 chromium Substances 0.000 claims description 7
- 239000010408 film Substances 0.000 abstract description 24
- 230000000694 effects Effects 0.000 abstract description 8
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 4
- 239000010409 thin film Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 132
- 239000003921 oil Substances 0.000 description 49
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
- 239000007789 gas Substances 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- 238000005336 cracking Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a surfacing repair method, which comprises the following steps: step S10, cleaning the surface of the wear-resistant part, and then preheating the wear-resistant part; step S20 of forming a weld layer by performing build-up welding on the surface of the wear-resistant member processed in step S10; and step S30, introducing protective gas carrying oil mist to form an oil film on the surface of the welding layer. According to the invention, the oil film is coated on the surface of the welding layer, so that air is blocked, and the effect of preventing the surface of the welding layer from being oxidized is achieved; by adopting the oil mist mode, the oil can be uniformly dispersed, so that a uniform and thin film layer is coated on the surface of the welding layer, the anti-oxidation effect is ensured, and the oil quantity is saved; meanwhile, the oil mist is conveyed through the protective gas, so that the uniformity of the oil film is further improved, and the thickness of the oil film is controllable.
Description
Technical Field
The invention relates to the technical field of surface repair, in particular to a surfacing repair method.
Background
Abrasion resistant equipment such as mills, crushers, and the like are commonly used in workpiece processing. The wear-resisting plate, the grinding roller, the hammer head and the like of the grinder are used as important parts for grinding a workpiece, and the working surface of the grinding roller, the hammer head and the like, which is directly contacted with the workpiece, is extremely easy to wear. The surface of the wear-out part is usually repaired by a surfacing process, but the repaired surfacing surface is easy to oxidize and crack, so that the use efficiency of the part is affected.
Disclosure of Invention
The invention mainly aims to provide a surfacing repair method, and aims to solve the problem that the surfacing surface is easy to oxidize in the prior art.
In order to achieve the purpose, the invention provides a surfacing repair method, which comprises the following steps:
step S10, cleaning the surface of the wear-resistant part, and then preheating the wear-resistant part;
step S20 of forming a weld layer by performing build-up welding on the surface of the wear-resistant member processed in step S10;
and step S30, introducing protective gas carrying oil mist to form an oil film on the surface of the welding layer.
Optionally, the oil mist has an average particle size of no more than 1.2 mm.
Optionally, the average particle size of the oil mist is 0.6-1.0 mm.
Optionally, the flow velocity pressure of the protective gas is 0.3-0.45 MPa.
Optionally, in step S20, the overlay welding is performed using a spin overlay welding process.
Optionally, step S20 includes:
performing multiple overlaying welding on the surface of the wear-resistant part processed in the step S10 in a protective atmosphere to form a plurality of unit layers, wherein the unit layers are sequentially overlaid in a direction away from the surface of the wear-resistant part to jointly form the welding layer;
the thickness of the unit layer on one side, away from the wear-resistant part, of the welding layer is 35-65 mm.
Optionally, the difference between the coefficient of thermal expansion of the material of the weld layer on the side close to the wear-resistant part and the coefficient of thermal expansion of the material of the wear-resistant part is not more than 40% of the coefficient of thermal expansion of the material of the wear-resistant part.
Optionally, the welding layer comprises a plurality of unit layers, and the wear-resistant part and the plurality of unit layers have a gradient of thermal expansion coefficient of the materials in the direction away from the surface of the wear-resistant part.
Optionally, the wear-resistant part comprises high-chromium cast iron, and the unit layers comprise Co-W-Mo alloy.
Optionally, in step S10, the preheating temperature is 300 to 350 ℃.
According to the technical scheme, the oil film is coated on the surface of the welding layer, so that air is blocked, and the effect of preventing the surface of the welding layer from being oxidized is achieved; by adopting the oil mist mode, the oil can be uniformly dispersed, so that a uniform and thin film layer is coated on the surface of the welding layer, the anti-oxidation effect is ensured, and the oil quantity is saved; meanwhile, the oil mist is conveyed through the protective gas, so that the uniformity of the oil film is further improved, and the thickness of the oil film is controllable.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Abrasion resistant equipment such as mills, crushers, and the like are commonly used in workpiece processing. The wear-resisting plate, the grinding roller, the hammer head and the like of the grinder are used as important parts for grinding a workpiece, and the working surface of the grinding roller, the hammer head and the like, which is directly contacted with the workpiece, is extremely easy to wear. The surface of the wear-out part is usually repaired by a surfacing process, but the repaired surfacing surface is easy to oxidize and crack, so that the use efficiency of the part is affected.
In view of this, the present invention provides a weld overlay repairing method, including the steps of:
step S10, cleaning the surface of the wear-resistant part, and then preheating the wear-resistant part;
step S20 of forming a weld layer by performing build-up welding on the surface of the wear-resistant member processed in step S10;
and step S30, introducing protective gas carrying oil mist to form an oil film on the surface of the welding layer.
According to the technical scheme, the oil film is coated on the surface of the welding layer, so that air is blocked, and the effect of preventing the surface of the welding layer from being oxidized is achieved; by adopting the oil mist mode, the oil can be uniformly dispersed, so that a uniform and thin film layer is coated on the surface of the welding layer, the anti-oxidation effect is ensured, and the oil quantity is saved; meanwhile, the oil mist is conveyed through the protective gas, so that the uniformity of the oil film is further improved, and the thickness of the oil film is controllable.
Specifically, in some embodiments, step S10 may operate as follows: cleaning dirt, oxide and the like attached to the surface of the wear-resistant part, and then cleaning and drying; and then placing the wear-resistant part subjected to drying treatment into a preheating furnace for preheating treatment, so that the temperature of the surface of the wear-resistant part can meet the requirement of surfacing. In one embodiment, the pre-heating temperature is 300-350 ℃.
In step S20, a weld layer material is used to build up the surface of the preheated wear-resistant member, thereby forming a weld layer on the surface. The welding layer can be of a single-layer structure or a multi-layer structure, and compared with the welding layer of the multi-layer structure, the welding layer of the multi-layer structure is better in wear resistance, longer in service life and not prone to cracking. In an embodiment, the solder layer has a multi-layer structure, and in the present embodiment, the step S20 specifically includes:
step S201, performing a plurality of times of build-up welding on the surface of the wear-resistant part processed in step S10 in a protective atmosphere to form a plurality of unit layers, and sequentially stacking the unit layers in a direction away from the surface of the wear-resistant part to jointly form the welding layer.
Specifically, by adopting a welding layer material, a first unit layer is formed on the surface of the wear-resistant part through overlaying, then a second unit layer is formed on the first unit layer through overlaying, and so on, and a plurality of unit layers are formed. The number of the unit layers can be adjusted according to actual needs, and the invention is not limited.
Wherein, the surfacing process is carried out in a protective atmosphere to avoid oxidation and further influence the performance of the welding layer. Specifically, the protective atmosphere may be nitrogen, argon, helium, or the like.
The thickness of the unit layer on one side, away from the wear-resistant part, of the welding layer is 35-65 mm. Specifically, the unit layer farthest from the surface of the wear-resistant member, that is, the unit layer on the side of the welding layer facing away from the wear-resistant member, among the plurality of unit layers is defined as a surface unit layer. The surface unit layer is used as a direct contact area of the repaired wear-resistant part and a workpiece, the performance of the surface unit layer is directly related to the working effect of the repaired wear-resistant part, in the embodiment, the thickness of the surface unit layer is 35-65 mm, and the surface unit layer has strong corrosion resistance and wear resistance in the range.
In step S20, the build-up welding is performed by a spin build-up welding process. The thickness of the welding layer can be uniform through rotary overlaying welding, a smoother welding layer surface is formed, the surface smoothness is improved, and the service life of the wear-resistant part is prolonged.
Furthermore, the difference between the coefficient of thermal expansion of the material of the welding layer on the side close to the wear-resistant part and the coefficient of thermal expansion of the material of the wear-resistant part is not more than 40% of the coefficient of thermal expansion of the material of the wear-resistant part. Specifically, the thermal expansion coefficient of the material used by the wear-resistant part is set to be A, and when the welding layer is of a single-layer structure, the difference value between the thermal expansion coefficient B of the material of the welding layer and the coefficient A is not more than 40% of the coefficient A, so that the thermal expansion coefficients of the welding layer and the wear-resistant part are relatively close, the stress between the welding layer and the wear-resistant part is favorably relieved, the connection strength between the welding layer and the wear-resistant part is improved, and cracking is avoided; when the welding layer is of a multilayer structure, the difference value between the thermal expansion coefficient C of the material used by the unit layer closest to the wear-resistant part in the plurality of unit layers and the thermal expansion coefficient A is not more than 40% of the value A, so that the thermal expansion coefficients of the welding layer and the wear-resistant part are relatively close to each other, and cracking is avoided. In principle, on the premise of ensuring the wear-resistant and corrosion-resistant properties of the material of the welding layer, the closer the thermal expansion coefficient of the material of one side of the welding layer close to the wear-resistant part is to the thermal expansion coefficient of the material of the wear-resistant part, the better the difference between the two is, the better the wear-resistant part is.
When the welding layer is of a multilayer structure, the welding layer comprises a plurality of unit layers, and the thermal expansion coefficients of the materials of the wear-resistant part and the unit layers are in gradient change in the direction away from the surface of the wear-resistant part. That is, in the direction away from the surface of the wear-resistant part, the thermal expansion coefficients of the materials of the wear-resistant part and the unit layers are in an increasing trend or a decreasing trend, so that when a laminated structure formed by the wear-resistant part and the unit layers is deformed by heat, the respective deformation amplitudes are relatively matched, and the risk of cracking between the layers is reduced. And in principle, the smaller the difference in the thermal expansion coefficient between any two adjacent layers (between two adjacent unit layers, or between the wear-resistant member and the unit layer adjacent thereto), the better. Wherein the coefficient of thermal expansion may be a linear coefficient of expansion.
Specifically, the wear-resistant part comprises high-chromium cast iron, and the unit layers comprise Co-W-Mo alloy, so that the thermal expansion coefficient of the Co-W-Mo alloy is close to that of the high-chromium cast iron, and the risk of cracking of the welding layer and the wear-resistant part can be reduced. Meanwhile, the alloy also contains tungsten and molybdenum, the respective contents of the tungsten and the molybdenum in the alloy are adjusted, and the thermal expansion coefficient of the alloy can be adjusted and controlled within a certain range, so that when the material of the surface unit layer can not meet the performance requirement and the thermal expansion coefficient requirement, the material composition of the surface unit layer can be adjusted, so that the wear resistance, the corrosion resistance and other characteristics meet the requirements, then a plurality of unit layers are arranged for transition, and the thermal expansion coefficients of the unit layers are in gradient change transition between the thermal expansion coefficient of the wear-resistant part and the thermal expansion coefficient of the surface unit layer by adjusting the respective contents of the tungsten/molybdenum in the unit layers, so that the condition that the difference between the thermal expansion coefficients of the two adjacent layers is overlarge is avoided.
The components in the above-mentioned Co — W — Mo alloy include, but are not limited to, Co, W, and Mo, and may include Fe (iron), C (carbon), Si (silicon), Cu (copper), and alkaline earth metal oxides.
In step S30, the oil is atomized to form an oil mist, and then the oil mist is carried by the shielding gas to flow so that the oil mist is uniformly and controllably attached to the surface of the welding layer to form an oil film, which can effectively isolate the surface of the repaired wear-resistant component from the air and prevent the welding layer from being oxidized or broken due to the oxidation of the surface of the repaired wear-resistant component when the repair wear-resistant component is in contact with the air during storage and storage.
Compared with a smearing mode, the oil mist is good in dispersibility and in a tiny droplet shape, can be uniformly distributed on the surface of the welding layer, and the formed oil film is relatively thin, so that the oil quantity is saved. Wherein the average particle size of the oil mist is not more than 1.2mm, which contributes to the formation of a uniform and extremely thin oil film. Further, the average particle size of the oil mist is 0.6-1.0 mm. Wherein the oil mist may be formed by means of an atomizing device such as an atomizer.
The protective gas can be nitrogen, argon, helium and the like, and the distribution density of oil mist and the residence time above the welding layer can be controlled by conveying the protective gas, so that the uniformity and the thickness of an oil film can be controlled. During specific implementation, the flow velocity pressure of the protective gas is 0.3-0.45 MPa, so that an oil film with a proper thickness can be formed, oxidation resistance is guaranteed, and waste is avoided.
In addition, the temperature of the protective gas is preferably room temperature, so that the protective gas can also play a role in cooling, and an oil film can be prepared while the welding layer is cooled.
The technical solutions of the present invention are further described in detail with reference to the following specific examples, which should be understood as merely illustrative and not limitative.
Example 1
Cleaning dirt, oxide and the like attached to the surface of the wear-resistant part, and then cleaning and drying; and then placing the dried wear-resistant part into a preheating furnace, and preheating at 300 ℃. And when the surface temperature of the wear-resistant part reaches 300 ℃, sequentially overlaying a first unit layer and a second unit layer on the surface of the wear-resistant part by adopting a rotary overlaying process in a protective atmosphere, wherein the thickness of the first unit layer is 30mm, and the thickness of the second unit layer (surface unit layer) is 35 mm. The thermal expansion coefficients of the materials of the wear-resistant part, the first unit layer and the second unit layer are in gradient change, and the difference between the thermal expansion coefficients of the materials of the first unit layer and the wear-resistant part is not more than 40% of the thermal expansion coefficient of the material of the wear-resistant part. After surfacing is finished, the wear-resistant part is placed in a cooling chamber, nitrogen is introduced until the temperature of the wear-resistant part is reduced to below 60 ℃, oil mist (the average particle size is 1.0mm) is doped into the nitrogen, the flow speed and the pressure of the nitrogen are adjusted to be 0.4MPa, so that an oil film is formed on the surface of a welding layer, and surfacing repair of the wear-resistant part is completed.
The wear-resistant part is made of high-chromium cast iron, and the first unit layer and the second unit layer are made of Co-W-Mo alloy.
Example 2
Cleaning dirt, oxide and the like attached to the surface of the wear-resistant part, and then cleaning and drying; and then placing the dried wear-resistant part into a preheating furnace, and carrying out preheating treatment at 350 ℃. And when the surface temperature of the wear-resistant part reaches 350 ℃, sequentially overlaying a first unit layer and a second unit layer on the surface of the wear-resistant part by adopting a rotary overlaying process in a protective atmosphere, wherein the thickness of the first unit layer is 30mm, and the thickness of the second unit layer (surface unit layer) is 65 mm. The thermal expansion coefficients of the materials of the wear-resistant part, the first unit layer and the second unit layer are in gradient change, and the difference between the thermal expansion coefficients of the materials of the first unit layer and the wear-resistant part is not more than 40% of the thermal expansion coefficient of the material of the wear-resistant part. After surfacing is finished, the wear-resistant part is placed in a cooling chamber, nitrogen is introduced until the temperature of the wear-resistant part is reduced to below 60 ℃, oil mist (with the average particle size of 0.6mm) is doped into the nitrogen, the flow speed and the pressure of the nitrogen are adjusted to be 0.3MPa, so that an oil film is formed on the surface of a welding layer, and surfacing repair of the wear-resistant part is completed.
The wear-resistant part is made of high-chromium cast iron, and the first unit layer and the second unit layer are made of Co-W-Mo alloy.
Example 3
Cleaning dirt, oxide and the like attached to the surface of the wear-resistant part, and then cleaning and drying; and then placing the dried wear-resistant part into a preheating furnace, and carrying out preheating treatment at 320 ℃. And when the surface temperature of the wear-resistant part reaches 320 ℃, sequentially overlaying a first unit layer and a second unit layer on the surface of the wear-resistant part by adopting a rotary overlaying process in a protective atmosphere, wherein the thickness of the first unit layer is 30mm, and the thickness of the second unit layer (surface unit layer) is 60 mm. The thermal expansion coefficients of the materials of the wear-resistant part, the first unit layer and the second unit layer are in gradient change, and the difference between the thermal expansion coefficients of the materials of the first unit layer and the wear-resistant part is not more than 40% of the thermal expansion coefficient of the material of the wear-resistant part. After surfacing is finished, the wear-resistant part is placed in a cooling chamber, nitrogen is introduced until the temperature of the wear-resistant part is reduced to below 60 ℃, oil mist (with the average particle size of 0.8mm) is doped into the nitrogen, the flow speed and the pressure of the nitrogen are adjusted to be 0.45MPa, so that an oil film is formed on the surface of a welding layer, and surfacing repair of the wear-resistant part is completed.
The wear-resistant part is made of high-chromium cast iron, the first unit layer is made of Co-W-Mo alloy, and the weight ratio of Co to W to Mo in the Co-W-Mo alloy is 58:22: 8; the second unit layer is made of Co-W-Mo alloy, and the weight ratio of Co to W to Mo in the Co-W-Mo alloy is 58:15: 2.
According to the technical scheme provided by the invention, the oil film is coated on the surface of the welding layer, so that air is blocked, and the effect of preventing the surface of the welding layer from being oxidized is achieved; by adopting the oil mist mode, the oil can be uniformly dispersed, so that a uniform and thin film layer is coated on the surface of the welding layer, the anti-oxidation effect is ensured, and the oil quantity is saved; the oil mist is conveyed through the protective gas, so that the uniformity of the oil film is further improved, and the thickness of the oil film is controllable; by adjusting the materials of the unit layers, the thermal expansion coefficients of the materials of the wear-resistant part, the first unit layer and the second unit layer are changed in a gradient mode, and the difference value of the thermal expansion coefficients of the materials of the first unit layer and the wear-resistant part is not larger than 40% of the thermal expansion coefficient of the material of the wear-resistant part, so that the cracking risk is reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A surfacing repair method is characterized by comprising the following steps:
step S10, cleaning the surface of the wear-resistant part, and then preheating the wear-resistant part;
step S20 of forming a weld layer by performing build-up welding on the surface of the wear-resistant member processed in step S10;
and step S30, introducing protective gas carrying oil mist to form an oil film on the surface of the welding layer.
2. A weld overlay repair method according to claim 1, wherein the oil mist has an average particle diameter of not more than 1.2 mm.
3. The build-up welding repair method according to claim 2, wherein the oil mist has an average particle diameter of 0.6 to 1.0 mm.
4. The weld overlay repairing method according to claim 1, wherein the flow rate and pressure of the shielding gas are 0.3 to 0.45 MPa.
5. The weld overlay repair method according to claim 1, wherein in step S20, the weld overlay is performed by a spin weld overlay process.
6. The weld overlay repair method according to claim 1, wherein step S20 includes:
performing multiple overlaying welding on the surface of the wear-resistant part processed in the step S10 in a protective atmosphere to form a plurality of unit layers, wherein the unit layers are sequentially overlaid in a direction away from the surface of the wear-resistant part to jointly form the welding layer;
the thickness of the unit layer on one side, away from the wear-resistant part, of the welding layer is 35-65 mm.
7. A weld overlay repair method according to claim 1 wherein the weld layer on a side thereof adjacent the wear component has a coefficient of thermal expansion that differs from the coefficient of thermal expansion of the material of the wear component by no more than 40% of the coefficient of thermal expansion of the material of the wear component.
8. The weld overlay repair method according to claim 1, wherein the weld layer comprises a plurality of unit layers, and the wear resistant member and the plurality of unit layers have a gradient in coefficient of thermal expansion of the material in a direction away from the surface of the wear resistant member.
9. The weld overlay repair method according to claim 8, wherein the wear-resistant member is made of high-chromium cast iron, and the material of each unit layer comprises a Co-W-Mo alloy.
10. The weld overlay repairing method according to claim 1, wherein the preheating temperature is 300 to 350 ℃ in step S10.
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| CN202110965633.6A CN113600972A (en) | 2021-08-20 | 2021-08-20 | Surfacing repair method |
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