CN115319329B - Method for repairing aluminum bronze block part by CMT arc additive and wire used in method - Google Patents
Method for repairing aluminum bronze block part by CMT arc additive and wire used in method Download PDFInfo
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- CN115319329B CN115319329B CN202211032025.0A CN202211032025A CN115319329B CN 115319329 B CN115319329 B CN 115319329B CN 202211032025 A CN202211032025 A CN 202211032025A CN 115319329 B CN115319329 B CN 115319329B
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- 239000000654 additive Substances 0.000 title claims abstract description 69
- 230000000996 additive effect Effects 0.000 title claims abstract description 69
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 43
- 229910000906 Bronze Inorganic materials 0.000 title claims abstract description 35
- 239000010974 bronze Substances 0.000 title claims abstract description 35
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000003466 welding Methods 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 20
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 13
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 13
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 12
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000004907 flux Effects 0.000 claims abstract description 8
- 230000008439 repair process Effects 0.000 claims description 56
- 230000008569 process Effects 0.000 claims description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 16
- 230000007547 defect Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 11
- 238000005253 cladding Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 239000011229 interlayer Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 8
- 238000007639 printing Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 238000005491 wire drawing Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910000881 Cu alloy Inorganic materials 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000004372 laser cladding Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000007704 transition 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
- 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
- B23K35/302—Cu as the principal 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
- B23K35/02—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
-
- 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
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a wire for repairing an aluminum bronze block part by CMT arc additive, which is characterized by comprising a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 15-20% of nickel powder, 10-15% of aluminum powder, 1.0% of silicon powder, 5-7% of tungsten powder, 8-10% of iron powder, 10-15% of cobalt powder and lanthanum powder: 0.5 to 1.0 percent of zinc powder: 2-4%, copper powder as the rest and the sum of the mass percentages of the components as 100%. The method for repairing the aluminum bronze block part by the CMT arc additive is simple to prepare, can be used for mass production, and can be widely applied to repairing the aluminum bronze.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing, and particularly relates to a wire for repairing an aluminum bronze block part by using a CMT (compact disc) arc additive, and a method for repairing the aluminum bronze block part by using the CMT arc additive.
Background
Copper alloy is widely applied to traffic, metallurgy and power industries due to good heat conductivity, self-lubricating property and electric conductivity, but has the defects of poor mechanical property, easiness in generating cracks, abrasion and the like in the using process, incapability of normal use of parts and serious potential safety hazards, and high cost for replacing one of the most noble metals of the copper alloy, so that various modes such as a metal repairing agent, a plasma repairing process, a laser repairing process and the like are adopted in engineering.
The metal repairing agent cannot be used for achieving higher binding force, frequent maintenance is needed, when the copper alloy part is repaired by laser, the repairing efficiency is lower due to reflection of the copper alloy on the laser, and the arc additive manufacturing technology is mature, compared with laser cladding and plasma cladding, the cost is lower, in addition, the CMT (cold metal transition technology) with small heat input can be used for obtaining an additive structural member with small heat source effect, and meanwhile, the repairing area and the original area can form good metallurgical combination due to high temperature, so that the structural member and the performance of the original part are less influenced compared with the traditional manual arc welding repairing copper alloy. Therefore, flux-cored wires for aluminum bronze block part repair have been developed in combination with CMT arc additive technology to accomplish part repair more efficiently and at lower cost.
Disclosure of Invention
The invention provides a wire for repairing an aluminum bronze block part by CMT arc additive, which is specially used for repairing aluminum bronze and can form good metallurgical bonding with an original aluminum bronze part.
A second object of the present invention is to provide a method of CMT arc additive repair of aluminum bronze bulk parts.
The first technical scheme adopted by the invention is that the wire for repairing the aluminum bronze block part by CMT arc additive comprises a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 15-20% of nickel powder, 10-15% of aluminum powder, 1.0% of silicon powder, 5-7% of tungsten powder, 8-10% of iron powder, 10-15% of cobalt powder and lanthanum powder: 0.5 to 1.0 percent of zinc powder: 2-4%, copper powder as the rest and the sum of the mass percentages of the components as 100%.
The present invention is also characterized in that,
the welding skin is copper strip, is in an annealed state, and has the thickness of 0.3mm and the width of 7mm; the powder coating rate of the wire (flux-cored wire) is 25-28%; the diameter of the wire (flux-cored wire) is 1.22-1.28 mm.
The second technical scheme adopted by the invention is that the method for repairing the aluminum bronze block part by CMT arc additive comprises the following specific steps:
step 1: preparing an arc additive repairing aluminum bronze block part wire: the following powders are respectively weighed according to the mass percentage: 15-20% of nickel powder, 10-15% of aluminum powder, 1.0% of silicon powder, 5-7% of tungsten powder, 8-10% of iron powder, 10-15% of cobalt powder and lanthanum powder: 0.5 to 1.0 percent of zinc powder: 2-4% of copper powder, the balance of copper powder, and the sum of the mass percentages of the components is 100%; copper strips are selected as welding skins; preparing a flux-cored wire with the diameter of 1.22-1.28 mm by adopting a flux-cored wire drawing machine;
step 2: detecting the inside of the part by adopting ultrasonic flaw detection equipment, and determining the size and the position of the crack defect;
step 3: the method comprises the steps of designing a path for repairing additive materials in a repairing area, wherein short-section multi-pass welding is needed in the design to reduce the influence on an original part, and a mechanical cutting mode is adopted to excavate the area near an original crack;
step 4: filling the flux-cored wire prepared in the step 1 into a CMT material adding system to complete the repairing process;
step 5: finish machining is carried out on the part repaired in the step 5, and surplus height and splashing generated in the process of cutting and material increasing repair are carried out;
step 6: and carrying out heat treatment on the repaired part to eliminate stress.
The present invention is also characterized in that,
in the step 3, the depth of the repair area is 5-10 mm below the bottom end of the crack, the length and the width are 5-8 mm extended outwards from two sides of the crack, and the repair bottom surface is required to be a plane.
In step 4, CMT arc additive process parameters: CMT additive current: 230-240A, the swing arc width is 5mm, the extension length of the welding wire is 12-15 mm, and an angle grinder is used for removing surface oxide skin and slag after each layer of printing is finished; cooling to room temperature for cladding, wherein the interlayer temperature is 100-150 ℃; the shielding gas is pure argon, the gas flow is 10-15L/min, and the wire filling speed is 450-500 mm/min.
In the step 6, the annealing temperature is 350-400 ℃ and the time is 60-75 min.
The beneficial effects of the invention are as follows:
(1) The invention provides a wire for arc additive repair of aluminum bronze parts, which can also be used in other repair fields, such as laser repair and the like;
(2) The method has small influence on the original part, and the repaired dimension is accurate.
(3) The wire provided by the method has the advantages that the hardness and wear resistance of the repaired wire are greatly improved, and meanwhile, the microstructure of the repair welding area is uniformly distributed and is free of defects.
(4) The wire provided by the invention is convenient to prepare, can be produced in small batch, and can form good metallurgical bonding with the original aluminum bronze part.
Drawings
FIG. 1 is a microstructure view of a repair area according to example 1 of the present invention;
FIG. 2 is a macroscopic view of the invention after repair according to example 1.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention provides a wire for repairing an aluminum bronze block part by CMT arc additive, which comprises a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 15-20% of nickel powder, 10-15% of aluminum powder, 1.0% of silicon powder, 5-7% of tungsten powder, 8-10% of iron powder, 10-15% of cobalt powder and lanthanum powder: 0.5 to 1.0 percent of zinc powder: 2-4%, copper powder as the rest and the sum of the mass percentages of the components as 100%.
Wherein the welding skin is copper strip, is in an annealed state, and has the thickness of 0.3mm and the width of 7mm; the powder coating rate of the wire (flux-cored wire) is 25-28%; the diameter of the wire (flux-cored wire) is 1.22-1.28 mm.
The functions and effects of each drug core powder are as follows:
nickel and copper have the same crystal structure, copper and nickel can be infinitely mutually dissolved, metallurgical bonding is formed between the nickel and the original block part, the mechanical property of a repair welding interface is improved, and meanwhile, certain toughness can be increased to relieve residual stress after repair welding;
in order to form equal component matching with the original aluminum bronze block, the aluminum powder reduces the dilution of the original parent metal, thereby reducing the performance of a repair welding heat affected zone, and simultaneously, the addition of aluminum element can improve the corrosion resistance and strength of the copper alloy;
the silicon powder plays a role in deoxidizing in order to protect a molten pool;
tungsten is used as a high-melting-point element, the wear resistance of the copper alloy can be improved, the repair welding area is used as a discontinuous area, cracks are more easily generated again, and the proper amount of tungsten can effectively reduce the wear amount of the copper alloy;
iron powder is dissolved into nickel to form solid solution strengthening, so that the surface hardness is improved;
cobalt can play a role in strengthening copper alloy, can inhibit the problem of grain growth during heat treatment, and corresponds to a post-welding heat treatment process;
the addition of rare earth elements can obviously improve the hardness;
the zinc powder can improve the fluidity of the molten wire materials and ensure the uniformity of the repair welding area tissues;
the invention also provides a method for repairing the aluminum bronze block part by CMT arc additive, which comprises the following specific steps:
step 1: preparing an arc additive repairing aluminum bronze block part wire: the following powders are respectively weighed according to the mass percentage: 15-20% of nickel powder, 10-15% of aluminum powder, 1.0% of silicon powder, 5-7% of tungsten powder, 8-10% of iron powder, 10-15% of cobalt powder and lanthanum powder: 0.5 to 1.0 percent of zinc powder: 2-4% of copper powder, the balance of copper powder, and the sum of the mass percentages of the components is 100%; copper strips are selected as welding skins; preparing a flux-cored wire with the diameter of 1.22-1.28 mm by adopting a flux-cored wire drawing machine;
step 2: detecting the inside of the part by adopting ultrasonic flaw detection equipment, and determining the size and the position of the crack defect;
step 3: the method comprises the steps of designing a path for repairing additive materials in a repairing area, wherein short-section multi-pass welding is needed in the design to reduce the influence on an original part, and a mechanical cutting mode is adopted to excavate the area near an original crack;
in the step 3, the depth of the repair area is 5-10 mm below the bottom end of the crack, the length and the width are 5-8 mm extended outwards from two sides of the crack, and the repair bottom surface is required to be a plane.
Step 4: filling the flux-cored wire prepared in the step 1 into a CMT material adding system to complete the repairing process;
in step 4, CMT arc additive process parameters: CMT additive current: 230-240A, the swing arc width is 5mm, the extension length of the welding wire is 12-15 mm, and an angle grinder is used for removing surface oxide skin and slag after each layer of printing is finished; cooling to room temperature for cladding, wherein the interlayer temperature is 100-150 ℃; the shielding gas is pure argon, the gas flow is 10-15L/min, and the wire filling speed is 450-500 mm/min.
Step 5: finish machining is carried out on the part repaired in the step 5, and surplus height and splashing generated in the process of cutting and material increasing repair are carried out;
step 6: and carrying out heat treatment on the repaired part to eliminate stress.
In the step 6, the annealing temperature is 350-400 ℃ and the time is 60-75 min.
Example 1
The method for repairing the aluminum bronze block part by CMT arc additive comprises the following specific steps:
step 1: preparing an arc additive repairing aluminum bronze block part wire: the following powders are respectively weighed according to the mass percentage: 20% of nickel powder, 15% of aluminum powder, 1.0% of silicon powder, 7% of tungsten powder, 10% of iron powder, 15% of cobalt powder and lanthanum powder: 1.0%, zinc powder: 4, copper powder: 27%; preparing a flux-cored wire with the diameter of 1.22mm by adopting a flux-cored wire drawing machine;
step 2: detecting the inside of the part by adopting ultrasonic flaw detection equipment, and determining the size and the position of the crack defect;
step 3: a path for repairing the additive is designed for the repair area, the area near the original crack is excavated in a mechanical cutting mode, the depth of the repair area is 5-10 mm below the bottom end of the crack, the length and the width are 5-8 mm outwards extended from two sides of the crack, and the repair bottom surface is required to be a plane;
step 4: filling the flux-cored wire prepared in the step 1 into a CMT (compact temperature) additive system to complete a repair process, wherein the parameters of the CMT arc additive process are as follows: CMT additive current: 230-240A, wherein the swing arc width is 5mm, the extension length of the welding wire is 12mm, and an angle grinder is used for removing surface oxide skin and slag after each layer of printing is finished; cooling to room temperature for cladding, wherein the interlayer temperature is 100 ℃; the shielding gas is pure argon, the gas flow is 10L/min, and the wire filling speed is 450mm/min;
step 5: finish machining is carried out on the part repaired in the step 5, and surplus height and splashing generated in the process of cutting and material increasing repair are carried out;
step 6: and carrying out heat treatment on the repaired part to eliminate stress, wherein the annealing temperature is 350 ℃ and the annealing time is 60min.
Example 1 a repaired bulk aluminum bronze part based on CMT arc additive manufacturing was obtained, the appearance of which is shown in fig. 2, the wire being capable of forming a good metallurgical bond with the original aluminum bronze part; after microscopic observation, the microscopic structure of the repaired area is uniform, and defects such as crack and air holes are not generated, as shown in figure 1, the average microhardness is 185HV 0.1 。
Example 2
The method for repairing the aluminum bronze block part by CMT arc additive comprises the following specific steps:
step 1: preparing an arc additive repairing aluminum bronze block part wire: the following powders are respectively weighed according to the mass percentage: 15% of nickel powder, 10% of aluminum powder, 1.0% of silicon powder, 7% of tungsten powder, 10% of iron powder, 15% of cobalt powder and lanthanum powder: 0.5%, zinc powder: 4, copper powder: 37.5%; preparing a flux-cored wire with the diameter of 1.28mm by adopting a flux-cored wire drawing machine;
step 2: detecting the inside of the part by adopting ultrasonic flaw detection equipment, and determining the size and the position of the crack defect;
step 3: a path for repairing the additive is designed for the repair area, the area near the original crack is excavated in a mechanical cutting mode, the depth of the repair area is 10mm below the bottom end of the crack, the length and the width of the repair area are 8mm extending outwards from two sides of the crack, and the repair bottom surface is required to be a plane;
step 4: filling the flux-cored wire prepared in the step 1 into a CMT (compact temperature) additive system to complete a repair process, wherein the parameters of the CMT arc additive process are as follows: CMT additive current: 230-240A, wherein the swing arc width is 5mm, the extension length of the welding wire is 15mm, and an angle grinder is used for removing surface oxide skin and slag after each layer of printing is finished; cooling to room temperature for cladding, wherein the interlayer temperature is 150 ℃; the shielding gas is pure argon, the gas flow is 15L/min, and the wire filling speed is 500mm/min;
step 5: finish machining is carried out on the part repaired in the step 5, and surplus height and splashing generated in the process of cutting and material increasing repair are carried out;
step 6: the repaired part was heat treated to relieve stress at 400 c for 75 minutes.
Example 2 obtaining a bulk aluminum bronze part repaired based on CMT arc additive manufacturing, after microscopic structural observation, the repaired region had a uniform microstructure, and had no defects such as crack and air holes, and had an average microhardness of 180HV 0.1 。
Example 3
The method for repairing the aluminum bronze block part by CMT arc additive comprises the following specific steps:
step 1: preparing an arc additive repairing aluminum bronze block part wire: the following powders are respectively weighed according to the mass percentage: 15% of nickel powder, 15% of aluminum powder, 1.0% of silicon powder, 5% of tungsten powder, 10% of iron powder, 10% of cobalt powder and lanthanum powder: 1%, zinc powder: 4, copper powder: 39%; preparing a flux-cored wire with the diameter of 1.22-1.28 mm by adopting a flux-cored wire drawing machine;
step 2: detecting the inside of the part by adopting ultrasonic flaw detection equipment, and determining the size and the position of the crack defect;
step 3: a path for repairing the additive is designed for the repair area, the area near the original crack is excavated in a mechanical cutting mode, the depth of the repair area is 8mm below the bottom end of the crack, the length and the width of the repair area are 6mm extending outwards from two sides of the crack, and the repair bottom surface is required to be a plane;
step 4: filling the flux-cored wire prepared in the step 1 into a CMT (compact temperature) additive system to complete a repair process, wherein the parameters of the CMT arc additive process are as follows: CMT additive current: 230-240A, wherein the swing arc width is 5mm, the extension length of the welding wire is 14mm, and an angle grinder is used for removing surface oxide skin and slag after each layer of printing is finished; cooling to room temperature for cladding, wherein the interlayer temperature is 120 ℃; the shielding gas is pure argon, the gas flow is 12L/min, and the wire filling speed is 480mm/min;
step 5: finish machining is carried out on the part repaired in the step 5, and surplus height and splashing generated in the process of cutting and material increasing repair are carried out;
step 6: and carrying out heat treatment on the repaired part to eliminate stress, wherein the annealing temperature is 380 ℃ and the time is 70min.
Example 3 obtaining a bulk aluminum bronze part repaired based on CMT arc additive manufacturing, after microscopic structural observations, the repaired region had a uniform microstructure, and had no defects such as crack and air holes, and had an average microhardness of 182.4HV 0.1 。
Example 4
The method for repairing the aluminum bronze block part by CMT arc additive comprises the following specific steps:
step 1: preparing an arc additive repairing aluminum bronze block part wire: the following powders are respectively weighed according to the mass percentage: 15% of nickel powder, 15% of aluminum powder, 1.0% of silicon powder, 5% of tungsten powder, 10% of iron powder, 10% of cobalt powder and lanthanum powder: 1%, zinc powder: 4, copper powder: 39%; preparing a flux-cored wire with the diameter of 1.25mm by adopting a flux-cored wire drawing machine;
step 2: detecting the inside of the part by adopting ultrasonic flaw detection equipment, and determining the size and the position of the crack defect;
step 3: a path for repairing the additive is designed for the repair area, the area near the original crack is excavated in a mechanical cutting mode, the depth of the repair area is 7mm below the bottom end of the crack, the length and the width of the repair area are 7mm extending outwards from two sides of the crack, and the repair bottom surface is required to be a plane;
step 4: filling the flux-cored wire prepared in the step 1 into a CMT (compact temperature) additive system to complete a repair process, wherein the parameters of the CMT arc additive process are as follows: CMT additive current: 230-240A, wherein the swing arc width is 5mm, the extension length of the welding wire is 12mm, and an angle grinder is used for removing surface oxide skin and slag after each layer of printing is finished; cooling to room temperature for cladding, wherein the interlayer temperature is 150 ℃; the shielding gas is pure argon, the gas flow is 10L/min, and the wire filling speed is 450mm/min;
step 5: finish machining is carried out on the part repaired in the step 5, and surplus height and splashing generated in the process of cutting and material increasing repair are carried out;
step 6: and carrying out heat treatment on the repaired part to eliminate stress, wherein the annealing temperature is 350 ℃ and the annealing time is 65min.
Example 4 obtaining a bulk aluminum bronze zero after repair based on CMT arc additive manufacturingAfter the part is observed by the microstructure, the microstructure of the repair area is uniform, defects such as crack and air holes and the like do not occur, and the average microhardness is 183HV 0.1 。
Example 5
The method for repairing the aluminum bronze block part by CMT arc additive comprises the following specific steps:
step 1: preparing an arc additive repairing aluminum bronze block part wire: the following powders are respectively weighed according to the mass percentage: 15% of nickel powder, 15% of aluminum powder, 1.0% of silicon powder, 5% of tungsten powder, 10% of iron powder, 10% of cobalt powder and lanthanum powder: 1%, zinc powder: 4, copper powder: 39%; preparing a flux-cored wire with the diameter of 1.22mm by adopting a flux-cored wire drawing machine;
step 2: detecting the inside of the part by adopting ultrasonic flaw detection equipment, and determining the size and the position of the crack defect;
step 3: a path for repairing the additive is designed for the repair area, the area near the original crack is excavated in a mechanical cutting mode, the depth of the repair area is 8mm below the bottom end of the crack, the length and the width of the repair area are 8mm extending outwards from two sides of the crack, and the repair bottom surface is required to be a plane;
step 4: filling the flux-cored wire prepared in the step 1 into a CMT (compact temperature) additive system to complete a repair process, wherein the parameters of the CMT arc additive process are as follows: CMT additive current: 230-240A, wherein the swing arc width is 5mm, the extension length of the welding wire is 12mm, and an angle grinder is used for removing surface oxide skin and slag after each layer of printing is finished; cooling to room temperature for cladding, wherein the interlayer temperature is 110 ℃; the shielding gas is pure argon, the gas flow is 12L/min, and the wire filling speed is 450mm/min;
step 5: finish machining is carried out on the part repaired in the step 5, and surplus height and splashing generated in the process of cutting and material increasing repair are carried out;
step 6: and (3) carrying out heat treatment on the repaired part to eliminate stress, wherein the annealing temperature is 350-400 ℃ and the annealing time is 60-75 min.
Example 5 obtaining a bulk aluminum bronze part repaired based on CMT arc additive manufacturing, after microscopic structural observations, the repaired region had a uniform microstructure, and had no defects such as crack and air holes, and had an average microhardness of 183.1HV 0.1 。
Claims (5)
- The wire for repairing the aluminum bronze block part by CMT arc additive is characterized by comprising a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 15-20% of nickel powder, 10-15% of aluminum powder, 1.0% of silicon powder, 5-7% of tungsten powder, 8-10% of iron powder, 10-15% of cobalt powder and lanthanum powder: 0.5-1.0%, zinc powder: 2-4% of copper powder, wherein the balance is 100% of the sum of the components in percentage by mass;the welding skin is copper strip, is in an annealed state, and has the thickness of 0.3mm and the width of 7mm; the powder coating rate of the wire is 25-28%; the diameter of the wire is 1.22-1.28 mm.
- A method for cmt arc additive repair of aluminum bronze bulk parts, characterized by the specific steps of:step 1: preparing an arc additive repairing aluminum bronze block part wire: the following powders are respectively weighed according to the mass percentage: 15-20% of nickel powder, 10-15% of aluminum powder, 1.0% of silicon powder, 5-7% of tungsten powder, 8-10% of iron powder, 10-15% of cobalt powder and lanthanum powder: 0.5-1.0%, zinc powder: 2-4% of copper powder, wherein the balance is 100% of the sum of the components in percentage by mass; copper strips are selected as welding skins; preparing a flux-cored wire with the diameter of 1.22-1.28 mm by adopting a flux-cored wire drawing machine; the powder coating rate of the wire is 25-28%;step 2: detecting the inside of the part by adopting ultrasonic flaw detection equipment, and determining the size and the position of the crack defect;step 3: designing a path for repairing the additive in the repairing area, and removing the area near the original crack by adopting a mechanical cutting mode;step 4: filling the flux-cored wire prepared in the step 1 into a CMT material adding system to complete the repairing process;step 5: finish machining is carried out on the part repaired in the step 4, and surplus height and splashing generated in the process of cutting and material increasing repair are cut;step 6: and carrying out heat treatment on the repaired part to eliminate stress.
- 3. The method for repairing an aluminum bronze block part by CMT arc additive according to claim 2, wherein in the step 3, the depth of the repair area is 5-10 mm below the bottom end of the crack, the length and the width are 5-8 mm extended outwards from two sides of the crack, and the repair bottom surface is required to be a plane.
- 4. The method of CMT arc additive repair of aluminum bronze bulk parts according to claim 2, wherein in step 4, CMT arc additive process parameters: CMT additive current: 230-240A, wherein the swing arc width is 5mm, the extension length of the welding wire is 12-15 mm, and an angle grinder is used for removing surface oxide skin and slag after each layer of printing is finished; cooling to room temperature for cladding, wherein the interlayer temperature is 100-150 ℃; the shielding gas is pure argon, the gas flow is 10-15L/min, and the wire filling speed is 450-500 mm/min.
- 5. The method for repairing an aluminum bronze bulk part by CMT arc additive according to claim 2, wherein in the step 6, the annealing temperature is 350-400 ℃ and the annealing time is 60-75 min.
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