CN111349955A - Method for repairing fatigue crack of drill rod - Google Patents
Method for repairing fatigue crack of drill rod Download PDFInfo
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- CN111349955A CN111349955A CN202010191313.5A CN202010191313A CN111349955A CN 111349955 A CN111349955 A CN 111349955A CN 202010191313 A CN202010191313 A CN 202010191313A CN 111349955 A CN111349955 A CN 111349955A
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- drill rod
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 72
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 238000009713 electroplating Methods 0.000 claims description 30
- 229910052759 nickel Inorganic materials 0.000 claims description 28
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 27
- 229910052782 aluminium Inorganic materials 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 17
- 239000003792 electrolyte Substances 0.000 claims description 15
- 230000008439 repair process Effects 0.000 claims description 12
- 229910020489 SiO3 Inorganic materials 0.000 claims description 7
- 238000007747 plating Methods 0.000 claims description 7
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 230000035876 healing Effects 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 12
- 238000004140 cleaning Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention relates to the technical field of drill steel tools, in particular to a method for repairing fatigue cracks of a drill rod. According to the repairing method provided by the invention, the oxide layer on the surface of the crack can be removed through electrolysis, and the bonding layer is electroplated on the surface of the crack to promote the healing of the crack; the drill rod can be heated to form temperature gradient distribution to guide pulse current to flow in a layered mode, so that a larger thermal effect can be obtained around the crack under the condition of lower input power, and stress can be removed; the drill rod can be kept still, and all treatment can be completed, so that damage caused by collision during operation among different procedures is avoided; the fatigue crack of the drill rod can be repaired on the premise of keeping the original microstructure structure of the drill rod unchanged.
Description
Technical Field
The invention relates to the technical field of drill steel tools, in particular to a method for repairing fatigue cracks of a drill rod.
Background
The drill steel drilling tool is a consumable copolymerization necessary for drilling, blasting and rock drilling operations in various mining projects, and has an international market of about 100 hundred million dollars each year. The drill rod is a core component of the drill tool, mostly fails due to corrosion fatigue fracture, and the service life is extremely short. At present, once a drill rod has fatigue cracks, the drill rod can only be replaced by a new drill rod to continue operation after the drill rod is broken. Therefore, the method for repairing the fatigue cracks of the drill rod is developed, the drill rod which is used for a certain time is subjected to fatigue crack repairing treatment and then is continuously used, and the method has important significance for prolonging the fatigue life of the drill rod.
Chinese patent CN110125611A provides a crack repairing method, in which the oxide layer on the surface of the crack is not removed before the pulse current is applied to the conductive member, so that the healing effect of the crack is insufficient. The method also applies external force to the cracks, which can promote the cracks to be better fused, but after the external force is written, residual tensile stress is formed inside the component, so that the cracks are easy to crack. According to the crack repairing method provided by the Chinese patent CN102744551A, cracks can only be stopped through pulse current, and then the cracks can be healed through surfacing repair. However, fatigue cracks are generally small in size, difficult to find and locate, and more difficult to repair by welding. The method for performing homogenization heat treatment on metal parts assisted by pulse current provided by chinese patent CN104141101B does not specifically limit the heat treatment temperature, and may cause recrystallization of metal materials during the heat treatment process, resulting in changes of texture and performance. Therefore, the prior art schemes cannot be directly applied to the repair process of the fatigue cracks of the drill rod.
Disclosure of Invention
The invention aims to provide a method for repairing fatigue cracks of a drill rod, which can remove an oxide layer on the surface of the cracks, electroplate a bonding layer to promote the cracks to heal, and remove the stress of the drill rod by heating the drill rod; meanwhile, the method can repair the fatigue crack of the drill rod on the premise of keeping the original microstructure structure of the drill rod unchanged.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for repairing fatigue cracks of a drill rod, which comprises the following steps:
taking the drill rod as a negative electrode and the aluminum bar as a positive electrode, and electrolyzing in electrolyte to obtain a pretreated drill rod;
electroplating in electroplating solution by taking the pretreated drill rod as a negative electrode and a nickel rod as a positive electrode to obtain a drill rod electroplated with a nickel layer;
and (3) respectively connecting two ends of the drill rod electroplated with the nickel layer with the anode and the cathode of a pulse current power supply, heating the outer surface of the drill rod electroplated with the nickel layer, and introducing pulse current when the temperature of the outer surface of the drill rod electroplated with the nickel layer reaches 400 ℃ to obtain the repaired drill rod.
Preferably, the drill rod has a crack of less than or equal to 5 mm.
Preferably, the solute of the electrolyte comprises NaOH and Na2CO3And Na4SiO3；
The NaOH and the Na2CO3And Na4SiO3In a molar ratio of 1:1: 1;
the concentration of NaOH in the electrolyte is (28-32) g/L.
Preferably, the voltage of the electrolysis is 180-220V, and the current density of the electrolysis is 80-120A/m2And the electrolysis time is 1-5 min.
Preferably, after the electrolysis is completed, the method further comprises: hydrochloric acid is used as leacheate, and the drill rod obtained after electrolysis is leached;
the mass concentration of the hydrochloric acid is 30-40%.
Preferably, the solute of the plating bath comprises NiCl2And HCl;
the NiCl2And the molar ratio of HCl to HCl is (2.5-3.5): 1;
the concentration of HCl in the electroplating solution is 80 g/L.
Preferably, the voltage of the electroplating is 180-220V, and the current density of the electroplating is 80-120A/m2And the electroplating time is 1-5 min.
Preferably, the heating mode is induction heating or open fire heating;
and in the heating process, monitoring the surface temperature of the drill rod electroplated with the nickel layer in real time by using an infrared thermal imager.
Preferably, the heating process is as follows: and raising the temperature of the outer surface of the drill rod electroplated with the nickel layer to 400 ℃ at a heating rate of 50 ℃/s to form a temperature gradient distribution with the center of 25 ℃ and the temperature of the outer surface of 400 ℃.
Preferably, the voltage of the pulse current is 220V, and the current density of the pulse current is 800-1200A/m2The frequency of the pulse current is 8-12 Hz, and the time for introducing the pulse current is 4-8 min.
The invention provides a method for repairing fatigue cracks of a drill rod, which comprises the following steps: taking the drill rod as a negative electrode and the aluminum bar as a positive electrode, and electrolyzing in electrolyte to obtain a pretreated drill rod; electroplating in electroplating solution by taking the pretreated drill rod as a negative electrode and a nickel rod as a positive electrode to obtain a drill rod electroplated with a nickel layer; and (3) respectively connecting two ends of the drill rod electroplated with the nickel layer with the anode and the cathode of a pulse current power supply, heating the outer surface of the drill rod electroplated with the nickel layer, and introducing pulse current when the temperature of the outer surface of the drill rod electroplated with the nickel layer reaches 400 ℃ to obtain the repaired drill rod. The method provided by the invention can remove the oxide layer on the surface of the crack by electrolysis and electroplate the bonding layer on the surface of the crack to promote the healing of the crack; the drill rod can be heated to form temperature gradient distribution to guide pulse current to flow in a layered mode, so that a larger thermal effect can be obtained around the crack under the condition of lower input power, and stress can be removed; the drill rod can be kept still, and all treatment can be completed, so that thermal damage caused by collision when the drill rod runs among different procedures is avoided; the fatigue crack of the drill rod can be repaired on the premise of keeping the original microstructure structure of the drill rod unchanged.
Detailed Description
The invention provides a method for repairing fatigue cracks of a drill rod, which comprises the following steps:
taking the drill rod as a negative electrode and the aluminum bar as a positive electrode, and electrolyzing in electrolyte to obtain a pretreated drill rod;
electroplating in electroplating solution by taking the pretreated drill rod as a negative electrode and a nickel rod as a positive electrode to obtain a drill rod electroplated with a nickel layer;
and (3) respectively connecting two ends of the drill rod electroplated with the nickel layer with the anode and the cathode of a pulse current power supply, heating the outer surface of the drill rod electroplated with the nickel layer, and introducing pulse current when the temperature of the outer surface of the drill rod electroplated with the nickel layer reaches 400 ℃ to obtain the repaired drill rod.
In the present invention, all the raw materials are commercially available products well known to those skilled in the art unless otherwise specified.
The invention takes the drill rod as the negative electrode and the aluminum bar as the positive electrode, and carries out electrolysis in the electrolyte to obtain the pretreated drill rod.
The drill rod of the present invention is not particularly limited, and a drill rod known to those skilled in the art may be used. In the present invention, the cracks of the drill rod are preferably less than or equal to 5 mm. In a specific embodiment of the invention, the material of the drill rod is specifically 55 SiMnMo; the diameter of the drill rod is specifically 22 mm.
In the present invention, it is preferable that the method further comprises cleaning the drill rod before the electrolysis; the cleaning process is preferably as follows: cleaning the drill rod with clear water; the purpose of the cleaning is to remove dirt from the surface of the drill rod.
In the present invention, the purity of the aluminum rod is preferably 99.00% or more, and more preferably 99.60%. The length of the aluminium bar is preferably the same as the length of the drill rod.
In the present invention, the solute of the electrolyte preferably includes NaOH, Na2CO3And Na4SiO3(ii) a The NaOH and the Na2CO3And Na4SiO3Preferably 1:1: 1; the concentration of NaOH in the electrolyte is preferably (28-32) g/L, and more preferably 30 g/L. In the present invention, the solvent of the electrolytic solution is preferably water.
In the invention, the voltage of the electrolysis is preferably 180-220V, and more preferably 200V; the current density of electrolysis is preferably 80-120A/m2More preferably 100A/m2(ii) a The electrolysis time is preferably 1-5 min, and more preferably 4 min.
In the present invention, the specific process of the electrolysis is preferably: immersing the drill rod by using an electrolyte, and connecting the drill rod with the negative electrode of a direct-current power supply; the anode of the power supply is connected with an aluminum bar with the same length as the drill rod, and the aluminum bar is placed in electrolyte; the aluminum bar and the drill rod are placed in parallel, the distance between the aluminum bar and the drill rod is controlled (the distance is preferably 100-200 mm, and more preferably 150mm), and the aluminum bar and the drill rod are electrified to carry out electrolysis.
In the present invention, the electrolysis serves to remove the surface oxide layer of the drill rod cracks.
After the electrolysis is completed, the invention also preferably comprises: hydrochloric acid is used as leacheate to leach the drill rod obtained after electrolysis. In the invention, the mass concentration of the hydrochloric acid is preferably 30-40%, and more preferably 37%; the leaching time is preferably 1-2 min, and more preferably 1 min.
After the pretreated drill rod is obtained, the pretreated drill rod is used as a negative electrode, a nickel rod is used as a positive electrode, and electroplating is carried out in electroplating solution to obtain the drill rod electroplated with a nickel layer.
In the invention, the purity of the nickel rod is preferably more than or equal to 99.00 percent, and more preferably 99.60 percent; the length of the nickel rod is preferably the same as the length of the drill rod.
In the present invention, the solute of the plating bath preferably comprises NiCl2And HCl; the NiCl2The molar ratio of HCl to HCl is preferably (2.5-3.5): 1, more preferably 3: 1; the concentration of HCl in the plating solution is preferably 80 g/L. In the present invention, the solvent of the plating solution is preferably water.
In the invention, the voltage of the electroplating is preferably 180-220V, and more preferably 220V; the current density of the electroplating is preferably 80-120A/m2More preferably 100A/m2(ii) a The time for electroplating is preferably 1-5 min, and more preferably 5 min.
In the present invention, the specific process of electroplating is preferably as follows: immersing the pretreated drill rod in the electroplating solution, and connecting the drill rod to the negative electrode of a direct-current power supply; and connecting the positive electrode of the power supply with the nickel rod and immersing the nickel rod in the electroplating solution, wherein the nickel rod is placed in parallel with the pretreated drill rod, the distance between the nickel rod and the pretreated drill rod is controlled (the distance is preferably 100-200 mm, and more preferably 150mm), and electrifying is carried out for electroplating.
In the invention, the electroplating is used for attaching a nickel layer on the crack surface of the drill rod, the crack surface is formed after repeated action of extrusion stress, the surface tissue structure of the crack surface is different from that of other surfaces of the drill rod, the outer surface of the drill rod is subjected to surface treatment processes such as carburizing and the like during manufacturing, and the surface chemical composition and the tissue structure of the outer surface of the drill rod are different from those of the crack surface, so that the electroplating can ensure that the nickel layer is attached on the crack surface of the drill rod.
After the electroplating is finished, the invention also preferably dries the drill rod obtained after the electroplating; the drying process is preferably to introduce dry anti-oxidation gas into the drill rod obtained after electroplating for drying. In the present invention, the oxidation preventing gas is preferably argon gas. The drying is not particularly limited in the present invention, and may be carried out under conditions well known to those skilled in the art.
After the drill rod electroplated with the nickel layer is obtained, the invention respectively connects two ends of the drill rod electroplated with the nickel layer with the anode and the cathode of a pulse current power supply, then heats the drill rod, and when the temperature of the outer surface of the drill rod electroplated with the nickel layer reaches 400 ℃, pulse current is introduced to obtain the repaired drill rod.
In the present invention, the heating is preferably induction heating or open flame heating; in the heating process, the invention preferably utilizes an infrared thermal imager to monitor the surface temperature of the drill rod electroplated with the nickel layer in real time. In the present invention, the heating process is preferably: and raising the temperature of the outer surface of the drill rod electroplated with the nickel layer to 400 ℃ at a heating rate of 50 ℃/s to form a temperature gradient with the center of 25 ℃ and the temperature of the outer surface of 400 ℃. In the present invention, the heating is preferably stopped before the pulse current is applied. In the present invention, the voltage of the pulse current is preferably 220V; the current density of the pulse current is preferably 800-1200A/m2More preferably 1000A/m2(ii) a The frequency of the pulse current is preferably 8-12 Hz, and more preferably 10 Hz; the time of the pulse current is preferably 4-8 min, and more preferably 5 min.
In the invention, the pulse current is guided by the temperature gradient to preferentially flow to the low-temperature region, so that the layer-by-layer annular current from the center to the outer surface is formed, the crack can be promoted to heal along the direction from the center to the surface, and the internal stress is removed. In the present invention, the temperature of the outer surface is less than the temperature range in which the drill rod will not recrystallize, to ensure that its texture and properties are not affected.
After the pulse current is introduced, the method also preferably comprises a cooling process; the cooling process is not particularly limited in the present invention, and may be performed by a process known to those skilled in the art.
The method for repairing fatigue cracks of a drill rod according to the present invention will be described in detail with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Drill rod to be treated: the material is 55SiMnMo and is an H22 drill rod (the outer diameter is 22mm) with cracks smaller than 5 mm;
cleaning dirt on the surface of the drill rod by using clean water, and then using electrolyte (the mass concentration of NaOH is 30g/L, Na)2CO3Has a mass concentration of 30g/L and Na4SiO330g/L) and connecting the drill rod with the negative pole of a direct current power supply; the anode of the power supply is connected with an aluminum bar with the same length as the drill rod, and the aluminum bar is placed in electrolyte; the aluminum bar and the drill rod are placed in parallel, the distance between the aluminum bar and the drill rod is controlled (the distance is 150mm), and the aluminum bar is electrified to carry out electrolysis (220V, 100A/m)2And 3min) to obtain a pretreated drill rod;
adopting hydrochloric acid (the mass concentration is 37%) as an eluent, carrying out elution (1min), and carrying out elution on the drill rod obtained after electrolysis;
immersing the pretreated drill rod in the electroplating solution (NiCl)2240g/L, 80g/L HCl) and connecting the drill rod to the negative pole of the direct current power supply; connecting the positive electrode of the power supply with the nickel rod and immersing the nickel rod in the electroplating solution, whereinThe nickel rod is placed in parallel with the pretreated drill rod, the distance between the nickel rod and the pretreated drill rod is controlled (the distance is 150mm), and the nickel rod is electrified to be electroplated (220V, 100A/m)25 min). Taking out and introducing dry argon gas for drying to obtain the repaired drill rod.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for repairing fatigue cracks of a drill rod is characterized by comprising the following steps:
taking the drill rod as a negative electrode and the aluminum bar as a positive electrode, and electrolyzing in electrolyte to obtain a pretreated drill rod;
electroplating in electroplating solution by taking the pretreated drill rod as a negative electrode and a nickel rod as a positive electrode to obtain a drill rod electroplated with a nickel layer;
and (3) respectively connecting two ends of the drill rod electroplated with the nickel layer with the anode and the cathode of a pulse current power supply, heating the outer surface of the drill rod electroplated with the nickel layer, and introducing pulse current when the temperature of the outer surface of the drill rod electroplated with the nickel layer reaches 400 ℃ to obtain the repaired drill rod.
2. The repair method according to claim 1, wherein the drill rod has cracks of 5mm or less.
3. The repair method of claim 1 wherein the electrolyte has a solute comprising NaOH, Na2CO3And Na4SiO3；
The NaOH and the Na2CO3And Na4SiO3In a molar ratio of 1:1: 1;
the concentration of NaOH in the electrolyte is (28-32) g/L.
4. The repair method according to claim 1, wherein the voltage of the electrolysis is 180 to 220V, and the current density of the electrolysis is 80 to 120A/m2And the electrolysis time is 1-5 min.
5. The repair method of claim 1 or 4, further comprising, after the electrolysis is completed: hydrochloric acid is used as leacheate, and the drill rod obtained after electrolysis is leached;
the mass concentration of the hydrochloric acid is 30-40%.
6. The repair method of claim 1 wherein the solute of the plating solution comprises NiCl2And HCl;
the NiCl2And the molar ratio of HCl to HCl is (2.5-3.5): 1;
the concentration of HCl in the electroplating solution is 80 g/L.
7. The repair method according to claim 1, wherein the voltage of the plating is 180 to 220V, and the current density of the plating is 80 to 120A/m2And the electroplating time is 1-5 min.
8. The repair method according to claim 1, wherein the heating is performed by induction heating or open flame heating;
and in the heating process, monitoring the surface temperature of the drill rod electroplated with the nickel layer in real time by using an infrared thermal imager.
9. A repair method according to claim 1 or 8, wherein the heating is performed by: and raising the temperature of the outer surface of the drill rod electroplated with the nickel layer to 400 ℃ at a heating rate of 50 ℃/s to form a temperature gradient distribution with the center of 25 ℃ and the temperature of the outer surface of 400 ℃.
10. A method of repairing according to claim 1, wherein said pulsed current is applied to said substrateThe voltage is 220V, and the current density of the pulse current is 800-1200A/m2The frequency of the pulse current is 8-12 Hz, and the time for introducing the pulse current is 4-8 min.
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| CN202010191313.5A CN111349955A (en) | 2020-03-18 | 2020-03-18 | Method for repairing fatigue crack of drill rod |
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| CN202010191313.5A CN111349955A (en) | 2020-03-18 | 2020-03-18 | Method for repairing fatigue crack of drill rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112362497A (en) * | 2020-10-27 | 2021-02-12 | 合肥工业大学 | Electromagnetic induction heating asphalt pavement gradient self-healing rate rating and control method |
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