CN112475560A - Welding flux for repairing pipe die and pipe die repairing method - Google Patents
Welding flux for repairing pipe die and pipe die repairing method Download PDFInfo
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- CN112475560A CN112475560A CN202011308849.7A CN202011308849A CN112475560A CN 112475560 A CN112475560 A CN 112475560A CN 202011308849 A CN202011308849 A CN 202011308849A CN 112475560 A CN112475560 A CN 112475560A
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- pipe die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- 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
- B23K9/18—Submerged-arc welding
-
- 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
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- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a solder for repairing a pipe die, which is a low-alloy stacked solder, and comprises the following components in percentage by mass: 0.15 to 0.25% of C, 0.35 to 0.75% of Si, 0.5 to 0.8% of Mn, 2.8 to 3.4% of Cr, 1.05 to 1.35% of Mo, 0.40 to 0.48% of V, and the balance of Fe. The invention also discloses a method for repairing the pipe die by using the solder, which finishes the repair of the pipe die by welding repair, machining and heat treatment. The invention can carry out whole body repair on the failed pipe die, ensures that the material of the welding repair part is basically consistent with that of the pipe die, and has better high temperature resistance and mechanical property and longer service life.
Description
Technical Field
The invention relates to the technical field of die repair, in particular to a welding flux for repairing a pipe die and a pipe die repairing method.
Background
In modern infrastructure construction, centrifugally cast nodular cast iron pipes gradually replace traditional cement pipes and gray iron pipes due to the advantages of thin wall, light weight, high strength, large elongation, corrosion resistance, easy transportation, installation, pressure resistance, bearing capacity, strong shock resistance and the like, and are widely used in projects such as urban water delivery, pollution discharge, large-scale water diversion projects, electric wires, cable sleeves and the like. The cast tube die is a key part for manufacturing the centrifugal ductile iron cast tube, and occupies a high proportion of the manufacturing cost of the centrifugal casting ductile iron cast tube.
At present, the domestic pipe casting die is mainly made of 21CrMo10 die steel, the inner wall of the pipe casting die is preheated before casting, a layer of die powder is uniformly distributed on the inner surface of the pipe die, the outer wall of the pipe die is cooled by circulating water, the water temperature is generally controlled to be about 50 ℃, the molten iron casting temperature is 1400-1450 ℃, the molten iron flows into the pipe die along with the molten iron, the pipe die rotates at a high speed, the centrifugal speed is about 400 rpm, and the highest temperature of the inner wall of the pipe die, which is numerically simulated by a computer, is about 600 ℃. And after the inner wall cracks, the ferrosilicon powder is also coated or scattered to be used as an inoculant to fill cracks and resist surface oxidation, and the production period of each cast pipe is about 3-6 min.
Because the cast tube die works under the high-temperature condition for a long time and the temperature difference between the inside and the outside is large, the cast tube die is very easy to wear and lose efficacy due to thermal fatigue, and the service life is generally short. From the failure mode in the pipe die, the failure of the cast pipe die is mainly cracking caused by thermal fatigue stress, and the cracks are in a network shape and are uniformly distributed without obvious directionality. The manufacturing cost of the cast pipe die is high, and the existing cast pipe die lacks a long-life surfacing material capable of performing through-body surfacing repair after thermal fatigue wear failure, so that the failed cast pipe die is basically not subjected to through-body surfacing repair, huge waste is caused, and heavy economic burden is brought to enterprises, therefore, the development of the high thermal fatigue resistant surfacing material suitable for pipe die surfacing has important economic significance.
Disclosure of Invention
Aiming at least one technical problem in the prior art, the invention provides the welding flux for repairing the pipe die and the pipe die repairing method, which can carry out whole body repairing on the failed pipe die, ensure that the material of the welding repairing part is basically consistent with that of the pipe die, have better high temperature resistance and mechanical property and longer service life.
In order to solve the problems, the technical scheme of the invention is as follows: a welding flux for repairing a pipe die is a low-alloy stacking welding flux, and the welding flux comprises the following components in percentage by mass: 0.15 to 0.25% of C, 0.35 to 0.75% of Si, 0.5 to 0.8% of Mn, 2.8 to 3.4% of Cr, 1.05 to 1.35% of Mo, 0.40 to 0.48% of V, and the balance of Fe.
Further, the content of C is 0.18-0.22%.
Further, the content of Mo is 1.15-1.25%.
Further, the content of Cr is 3.0-3.2%.
Further, the content of Si is 0.46-0.58%.
Furthermore, the solder also comprises Ni, and the content of the Ni is 0.25-0.35%.
The invention also provides a pipe die repairing method by using the solder, which comprises the following steps:
s1, welding preparation: putting solder and flux into a submerged arc welding machine, wherein the flux is SJ101 type flux;
s2, welding: repairing and welding the inner wall of the pipe die by using a submerged arc welding machine, wherein the welding current is 400-600A, and the thickness of a surfacing layer is not less than 5 mm;
s3 machining: grinding and polishing the inner wall of the pipe die repaired and welded in the step S2 to make the inner wall of the pipe die flat and smooth;
s4, heat treatment: and (5) putting the pipe die machined in the step S3 into a vacuum furnace, heating to 560-580 ℃ at a heating rate of 2-8 ℃/min, maintaining for more than 0.8h, and finally naturally cooling to room temperature to finish the repair of the pipe die.
Further, in the step S1, the weight ratio of the solder to the flux is 0.8 to 0.95.
Further, in the step S2, the thickness of the overlay is not less than 8 mm.
Further, in the step S4, the temperature rise rate is controlled to be 3-5 ℃/min, and the temperature is raised to 560-580 ℃ and then maintained for 1.0-1.2 h.
The invention has the beneficial effects that: the invention designs the submerged-arc welding solder special for repairing the pipe die, can carry out whole body repair on the failed pipe die, ensures that the material of the welding repair part is basically consistent with the material of the pipe die, ensures that the coefficient of expansion with heat and contraction with cold of the repaired pipe die is basically consistent when in use, and effectively prolongs the service life of the repaired pipe die; the solder provided by the invention can be matched with a specific repair method, so that deposited metal at a welding position can obtain a reasonable crystalline phase organization structure, the overall hardness and strength are high, the thermal fatigue performance is good, and the service life of a pipe die is effectively prolonged; the invention provides a convenient and low-cost repairing method, which can repair the failed pipe die, effectively reduce the production cost of centrifugally casting the nodular cast iron pipe, effectively reduce the resource waste and have better economic benefit.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The invention relates to a welding flux for repairing a pipe die, which is a low-alloy stacked welding flux and comprises the following components in percentage by mass: 0.15 to 0.25% of C, 0.35 to 0.75% of Si, 0.5 to 0.8% of Mn, 2.8 to 3.4% of Cr, 1.05 to 1.35% of Mo, 0.40 to 0.48% of V, and the balance of Fe.
The solder can be prepared into welding rods or welding wires for submerged arc welding machines.
Before the invention, the existing pipe die repair welding materials are various in types, including low alloy welding materials, medium carbon alloy welding materials, low chromium welding materials, high nickel welding materials and the like, and the repair welding modes also include laser welding and submerged arc welding.
For example, the invention patent with the Chinese patent number of CN201711287439.7 discloses semiconductor laser cladding nickel-based alloy powder for repairing the inner wall of a centrifugal ball-milling tube die, which belongs to high-nickel welding flux, however, the operation difficulty for repairing the inner wall of the tube die by adopting a laser welding mode is very high, the cost is very high, and the whole body repairing difficulty is very high. The nickel-based solder has good high-temperature resistance and high-temperature strength, but the deposited metal of the solder has large component difference with the pipe mould body material, and the deposited metal is easy to fall off and crack due to the difference of coefficients of expansion caused by heat and contraction caused by cold when in use.
The submerged arc surfacing repair is adopted, at present, EDPCrMoV-A0 series welding flux and EDD-C series welding flux are mostly used, and according to the national standard GB/T984-2001, the two series welding fluxes are respectively low-medium alloy welding flux and high-speed steel welding flux. Mainly, the deposited metal components of the two types of welding materials are relatively close to the material 21CrMo10 die steel of the current pipe die. By analyzing the components of the two types of welding materials in the national standard, for low-carbon and medium-low alloy surfacing welding materials, certain amounts of Mn and silicon are required to be added for deoxidation and desulfurization, and the content of silicon is required to be more than 0.8 percent so as to improve the strength and the hardness of deposited metal. The ferrite, which silicon can dissolve in the molten steel during welding, increases the strength and hardness of the steel, resulting in an increase in the strength of the weld. Next, when the content of Mo in the solder is low, about 1% of Ni needs to be added to increase the hardness of the deposited metal.
However, for pipe mould repair, not only the strength and hardness, but also the overall high temperature fatigue properties of the material need to be considered. The inventor finds that the high-temperature fatigue performance and the toughness of the material have a certain relation. The operational environment of pipe die is in inside high temperature, outside microthermal temperature environment, and the inside and outside difference in temperature is great, and the material can accumulate great internal stress because expend with heat and contract with cold this moment, will appear the fracture when the internal stress surpasss the material limit or material fragility itself is higher. Further, under such temperature conditions for a long period of time, cracks are more likely to occur when the internal crystal phase structure of the material is unstable, and the inventors speculate that the unstable crystal phase structure causes the crystal phase structure of the material to be altered under a severe temperature environment, and causes the material to be brittle and sharply increase, resulting in cracks.
Based on the findings, the inventor adjusts the content of silicon correspondingly when designing the solder, and simultaneously reduces the addition amount of Mn. Since silicon causes brittleness of deposited metal, the present invention provides a solder in which silicon merely acts as deoxidation, and the inventors have determined through trial and error that in the present solder system, when the Si content is controlled to 0.35 to 0.75% and the Mn content is controlled to 0.5 to 0.8%, silicon is completely removed as slag during soldering, and the deoxidation effect can be ensured without forming a residue in the deposited metal.
Meanwhile, in order to ensure the hardness and the strength of the final deposited metal, the inventor adjusts the carbon ratio in the welding flux to be higher, adjusts the C ratio to be 0.15-0.25%, and simultaneously adds certain contents of Mo and V so as to ensure that the hardness of the material is not reduced on the premise that the deposited metal does not contain silicon.
After the overall performance of the solder is considered, the inventor further analyzes the coefficient of expansion with heat and contraction with cold of the 21CrMo10 die steel in detail, and optimizes the content of each component of the solder in a targeted manner, so that the consistency of the coefficient of expansion with heat and contraction with cold of the deposited metal and the 21CrMo10 die steel is high, and the reduction of the service life of the deposited metal layer caused by the difference of the coefficient of expansion with heat and contraction with cold is avoided.
In a more preferred embodiment of the present invention, the content of C is 0.18 to 0.22%.
In a more preferred embodiment of the present invention, the content of Mo is 1.15 to 1.25%.
After a large number of experiments, the inventor determines the content of C and the content of Mo, so that the hardness of the deposited metal is close to 21CrMo10 die steel, the coefficient of expansion with heat and contraction with cold of the deposited metal can be highly consistent with that of 21CrMo10 die steel, and the toughness of the deposited metal is superior to that of 21CrMo10 die steel.
In a more preferred embodiment of the present invention, the content of Cr is 3.0 to 3.2%.
After a large number of experiments, the inventor determines that the content of Cr is in the optimal range, and can adjust the coefficient of expansion with heat and contraction with cold of the deposited metal, so that the coefficient of expansion with heat and contraction with cold of the deposited metal can be consistent with the height of 21CrMo10 die steel.
In a more preferred embodiment of the present invention, the content of Si is 0.46 to 0.58%.
After a large number of experiments, the inventor determines that the content of Si is in the optimal range, can control the content of Mn in the deposited metal, and can play a key role in adjusting the coefficient of expansion with heat and contraction with cold of the deposited metal. When the content of Mn in the deposited metal is controlled in a lower range, and when the content of other components is close to that of 21CrMo10 die steel, the coefficient of expansion with heat and contraction with cold of the deposited metal can be highly consistent with that of 21CrMo10 die steel.
In a more preferred embodiment of the present invention, the solder further includes Ni, and the content of Ni is 0.25 to 0.35%.
The addition of Ni can further increase the hardness of the material and thus the thermal fatigue properties of the material. However, too large an amount of Ni added results in a large change in the coefficient of thermal expansion and contraction of the material, and also increases the brittleness of the material to some extent. Through experiments, the inventor further finds that the hardness of the deposited metal can be improved to a certain degree at the addition amount of 0.25-0.35%, and the brittleness and the coefficient of expansion with heat and contraction with cold change are slight.
The core of the invention is based on the research on the pipe die failure repair made of 21CrMo10 die steel, and the toughness and the coefficient of expansion with heat and contraction with cold of the repair material are found to have great influence on the service life. Therefore, the specific proportion of C, Si, Mn, Cr and Mo is designed to obtain the welding deposited metal with the toughness superior to that of 21CrMo10 die steel, and the welding flux with the coefficient of expansion with heat and contraction with cold extremely high in consistency with that of 21CrMo10 die steel is used as the special welding flux for repairing the pipe die, so that the quality of the repaired pipe die is basically the same as that of a new pipe die, and meanwhile, the service life is long. Therefore, the proportion of C, Si, Mn, Cr and Mo is the core of the better technical effect of the invention.
The invention also provides a pipe die repairing method by using the solder, which comprises the following steps:
s1, welding preparation: putting solder and flux into a submerged arc welding machine, wherein the flux is SJ101 type flux;
s2, welding: repairing and welding the inner wall of the pipe die by using a submerged arc welding machine, wherein the welding current is 400-600A, and the thickness of a surfacing layer is not less than 5 mm;
s3 machining: grinding and polishing the inner wall of the pipe die repaired and welded in the step S2 to make the inner wall of the pipe die flat and smooth;
s4, heat treatment: and (5) putting the pipe die machined in the step S3 into a vacuum furnace, heating to 560-580 ℃ at a heating rate of 2-8 ℃/min, maintaining for more than 0.8h, and finally naturally cooling to room temperature to finish the repair of the pipe die.
Due to the special design idea of the solder, the toughness and the coefficient of expansion with heat and contraction with cold are concerned in the design of the solder, and certain sacrifice is made on the hardness and the strength. The hardness and the surface hardness of the deposited metal are slightly lower than those of 21CrMo10 die steel, and considering that the hardness is adjusted by proportioning to influence the toughness and the coefficient of expansion with heat and contraction with cold, the invention designs a special repair process, and improves the hardness of the deposited metal through heat treatment after welding, so that the coefficient of expansion with heat and contraction with cold is not influenced, and the toughness is enhanced to a certain extent. The inventor finds that after heat treatment, the crystalline phase microstructure of deposited metal is mainly ferrite, C is uniformly distributed by fine particles, the surface C content is improved to a certain extent, the internal crystalline phase microstructure is more stable, and the thermal fatigue performance is greatly improved.
In a more preferred embodiment of the present invention, in the step S1, the weight ratio of the solder to the flux is 0.8 to 0.95.
The solder of the invention can save the using amount of a welding machine.
In a more preferred embodiment of the present invention, in the step S2, the thickness of the overlay layer is not less than 8 mm.
In a preferred embodiment of the present invention, in the step S4, the temperature increase rate is controlled to be 3 to 5 ℃/min, and the temperature is maintained for 1.0 to 1.2 hours after the temperature is increased to 560 to 580 ℃.
By adopting the process parameters, the proportion of ferrite in the crystal phase structure is higher, and the crystal phase structure is more stable.
The following examples of repairing a failure-cracked pipe mold with the solder and the repairing method of the present invention are described as experimental products. And then detecting the deposited metal layer of the repaired part, and comparing the detection result with related parameters of a brand new pipe die.
Example 1
The solder formula is as follows: 0.15% of C, 0.35% of Si, 0.8% of Mn, 3.4% of Cr, 1.35% of Mo, 0.48% of V and the balance of Fe.
S1, welding preparation: putting solder and flux into a submerged arc welding machine, wherein the flux is SJ101 type flux, and the weight ratio of the solder to the flux is 1.06;
s2, welding: repairing and welding the inner wall of the pipe die by using a submerged arc welding machine, wherein the welding current is 400-600A, and the thickness of a surfacing layer is 5-8 mm;
s3 machining: grinding and polishing the inner wall of the pipe die repaired and welded in the step S2 to make the inner wall of the pipe die flat and smooth;
s4, heat treatment: and (5) putting the pipe die machined in the step S3 into a vacuum furnace, heating to 560-580 ℃ at the heating rate of 8 ℃/min, maintaining for 1.5h, and naturally cooling to room temperature to finish the repair of the pipe die.
Example 2
The solder formula is as follows: 0.25% of C, 0.75% of Si, 0.5% of Mn, 2.8% of Cr, 1.05% of Mo, 0.40% of V, 0.35% of Ni and the balance of Fe.
S1, welding preparation: putting solder and flux into a submerged arc welding machine, wherein the flux is SJ101 type flux, and the weight ratio of the solder to the flux is 0.98;
s2, welding: repairing and welding the inner wall of the pipe die by using a submerged arc welding machine, wherein the welding current is 400-600A, and the thickness of a surfacing layer is not less than 8-10 mm;
s3 machining: grinding and polishing the inner wall of the pipe die repaired and welded in the step S2 to make the inner wall of the pipe die flat and smooth;
s4, heat treatment: and (5) putting the pipe die machined in the step S3 into a vacuum furnace, heating to 560-580 ℃ at the heating rate of 2 ℃/min, maintaining for 0.8h, and naturally cooling to room temperature to finish the repair of the pipe die.
Example 3
The solder formula is as follows: 0.22% of C, 0.46% of Si, 0.5-0.8% of Mn, 3.2% of Cr, 1.15% of Mo, 0.42% of V, 0.25% of Ni and the balance of Fe.
S1, welding preparation: putting solder and flux into a submerged arc welding machine, wherein the flux is SJ101 type flux, and the weight ratio of the solder to the flux is 0.8;
s2, welding: repairing and welding the inner wall of the pipe die by using a submerged arc welding machine, wherein the welding current is 400-600A, and the thickness of a surfacing layer is not less than 8-10 mm;
s3 machining: grinding and polishing the inner wall of the pipe die repaired and welded in the step S2 to make the inner wall of the pipe die flat and smooth;
s4, heat treatment: and (5) putting the pipe die machined in the step S3 into a vacuum furnace, heating to 560-580 ℃ at a heating rate of 3 ℃/min, maintaining for more than 1.0h, and naturally cooling to room temperature to finish the repair of the pipe die.
Example 4
The solder formula is as follows: 0.18% of C, 0.58% of Si, 0.5-0.8% of Mn, 3.0% of Cr, 1.25% of Mo, 0.44% of V, 0.30% of Ni and the balance of Fe.
S1, welding preparation: putting solder and flux into a submerged arc welding machine, wherein the flux is SJ101 type flux, and the weight ratio of the solder to the flux is 0.95;
s2, welding: repairing and welding the inner wall of the pipe die by using a submerged arc welding machine, wherein the welding current is 400-600A, and the thickness of a surfacing layer is not less than 8-10 mm;
s3 machining: grinding and polishing the inner wall of the pipe die repaired and welded in the step S2 to make the inner wall of the pipe die flat and smooth;
s4, heat treatment: and (5) putting the pipe die machined in the step S3 into a vacuum furnace, heating to 560-580 ℃ at a heating rate of 5 ℃/min, maintaining for more than 1.2h, and naturally cooling to room temperature to finish the repair of the pipe die.
The hardness and the coefficient of expansion with heat and contraction with cold of the deposited metal of the repair parts of the examples 1 to 4 and the difference, the toughness and the service life of the 21CrMo10 die steel are detected and calculated, the related detection methods adopt national standard methods, and the obtained results are shown in Table 1.
| Item | Hardness (HRC) | Difference in coefficient of expansion with heat and contraction with cold | Toughness of | Service life |
| Example 1 | 58 | 1.4％ | Is superior to the new pipe die | Is 21 percent higher than that of a new pipe die |
| Example 2 | 61 | 1.2％ | Is superior to the new pipe die | Higher than that of new pipe die by 23 percent |
| Example 3 | 60 | 0.9％ | Is superior to the new pipe die | Is 28 percent higher than that of a new pipe mould |
| Example 4 | 62 | 1.1％ | Is superior to the new pipe die | Is 26 percent higher than that of a new pipe die |
| New pipe die | 56 | / | / | / |
Table 1 repair tube mould parameter table
The data in table 1 show that the difference between the coefficient of thermal expansion and cold contraction of the repaired deposited metal layer and the material of the pipe die body of the pipe die repaired by the welding flux and the repairing method is within 1.5 percent, the consistency is higher, the hardness is higher than that of the inner wall of the new pipe die, the toughness is better than that of the new pipe die, and the service life of the pipe die repaired by the whole body is prolonged by more than 20 percent compared with that of the new pipe die. The welding flux and the repairing method have excellent effect on repairing the pipe die.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The solder for repairing the pipe die is low-alloy stacking solder, and is characterized by comprising the following components in percentage by mass: 0.15 to 0.25% of C, 0.35 to 0.75% of Si, 0.5 to 0.8% of Mn, 2.8 to 3.4% of Cr, 1.05 to 1.35% of Mo, 0.40 to 0.48% of V, and the balance of Fe.
2. The solder for repairing the pipe die as claimed in claim 1, wherein the content of C is 0.18-0.22%.
3. The solder for repairing the pipe die as claimed in claim 1, wherein the content of Mo is 1.15-1.25%.
4. The welding flux for repairing the pipe die as claimed in claim 1, wherein the content of Cr is 3.0-3.2%.
5. The solder for repairing the pipe die as claimed in claim 1, wherein the content of Si is 0.46-0.58%.
6. The solder for repairing the pipe die as claimed in claim 1, wherein the solder further comprises Ni, and the content of Ni is 0.25-0.35%.
7. A pipe die repairing method using the solder according to claims 1-6, characterized by comprising the steps of:
s1, welding preparation: putting solder and flux into a submerged arc welding machine, wherein the flux is SJ101 type flux;
s2, welding: repairing and welding the inner wall of the pipe die by using a submerged arc welding machine, wherein the welding current is 400-600A, and the thickness of a surfacing layer is not less than 5 mm;
s3 machining: grinding and polishing the inner wall of the pipe die repaired and welded in the step S2 to make the inner wall of the pipe die flat and smooth;
s4, heat treatment: and (5) putting the pipe die machined in the step S3 into a vacuum furnace, heating to 560-580 ℃ at a heating rate of 2-8 ℃/min, maintaining for more than 0.8h, and finally naturally cooling to room temperature to finish the repair of the pipe die.
8. The method for repairing a pipe mold according to claim 7, wherein in the step S1, the weight ratio of the solder to the flux is 0.8-0.95.
9. The method for repairing a pipe mold according to claim 7, wherein in the step S2, the weld overlay thickness is not less than 8 mm.
10. The method for repairing a pipe die according to claim 7, wherein in the step S4, the temperature rise rate is controlled to be 3-5 ℃/min, and the temperature is maintained for 1.0-1.2 hours after the temperature is raised to 560-580 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114770028A (en) * | 2022-06-01 | 2022-07-22 | 新兴铸管阜康能源有限公司 | Remanufacturing method of pipe mold based on submerged arc welding and laser cladding |
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| CN1709636A (en) * | 2005-07-18 | 2005-12-21 | 门树槐 | Pipe die build-up welding cored wire |
| CN101433989A (en) * | 2008-12-18 | 2009-05-20 | 天津钢管集团股份有限公司 | Method for welding cold-expansion tube production line draw rod |
| CN101983827A (en) * | 2010-10-19 | 2011-03-09 | 成都新大洋焊接材料有限责任公司 | Alloy creep resistant heat resistant steel submerged arc welding stick |
| CN105382378A (en) * | 2015-10-27 | 2016-03-09 | 张荣斌 | Surfacing welding method for abraded large roll shaft |
| CN107335939A (en) * | 2017-05-12 | 2017-11-10 | 中信重工机械股份有限公司 | The big thickness Bead weld repair layer of large-scale 70Cr3Mo backing rolls and renovation technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114770028A (en) * | 2022-06-01 | 2022-07-22 | 新兴铸管阜康能源有限公司 | Remanufacturing method of pipe mold based on submerged arc welding and laser cladding |
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