CN113319466B - Surfacing welding method for inner wall of thin-wall cylinder - Google Patents
Surfacing welding method for inner wall of thin-wall cylinder Download PDFInfo
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- CN113319466B CN113319466B CN202110660154.3A CN202110660154A CN113319466B CN 113319466 B CN113319466 B CN 113319466B CN 202110660154 A CN202110660154 A CN 202110660154A CN 113319466 B CN113319466 B CN 113319466B
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- 238000003466 welding Methods 0.000 title claims abstract description 181
- 238000000034 method Methods 0.000 title claims abstract description 61
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 51
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000010935 stainless steel Substances 0.000 claims abstract description 31
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 31
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910021538 borax Inorganic materials 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 11
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 11
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical class [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 5
- 239000010433 feldspar Substances 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 239000011733 molybdenum Substances 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 44
- 239000000306 component Substances 0.000 description 12
- 239000000758 substrate Substances 0.000 description 9
- 238000005498 polishing Methods 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical class [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 5
- 239000011324 bead Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a surfacing welding method for the inner wall of a thin-wall cylinder, which comprises the following steps: a stainless steel surfacing layer is built on the inner wall of the cylinder body base body by utilizing a stainless steel flux-cored wire; surfacing a tungsten carbide surfacing layer on the inner wall of the stainless steel surfacing layer by using a nickel-based tungsten carbide welding wire; the filling rate of the nickel-based tungsten carbide welding wire is 65%, and the flux-cored wire of the nickel-based tungsten carbide welding wire comprises the following components in percentage by weight: 78-85% of WC, 1-10% of TiC, 1-6% of borax, 0-5% of dehydrated potash feldspar, 0-5% of high-carbon ferrochrome and 0-5% of metal molybdenum. The novel cylinder can meet the requirement of the inner wall wear resistance of a large thin-wall cylinder, and has the advantages of small welding spatter, attractive weld forming, good wettability of deposited metal and a cylinder body base body, small shrinkage deformation of the cylinder body after welding, and capability of meeting the requirement of the normal production size of a workpiece.
Description
Technical Field
The invention relates to a surfacing welding method for the inner wall of a thin-wall cylinder.
Background
At present, China pays more attention to the major equipment manufacturing industry, and particularly, the key core technology for attacking the problem of neck blockage is provided. The resulting solderability problems are also more challenging. For example: in the field of high-end titanium dioxide preparation, the chlorination method for preparing titanium dioxide has the advantages of less three wastes, less air pollution, high product quality, easiness in industrial production and the like, so that the method becomes a mainstream preparation method for producing titanium dioxide in developed countries abroad, the core technology of production equipment is always highly monopolized, and the technology of China is blocked.
The barrel for conveying the mixture of the titanium-rich material and the coke in the high-level storage bin continuously receives complex impact load and frictional wear in the operation process of the equipment. In order to avoid the premature failure of the cylinder body due to excessive wear, the reduction of production capacity and even shutdown, and the huge economic loss caused by shutdown, a wear-resistant layer needs to be overlaid on the inner wall of the cylinder body.
The large-scale thin-wall cylinder of the heavy equipment is continuously subjected to complex impact load and frictional wear in the service process, and the inner wall of the large-scale thin-wall cylinder is easy to wear and break. Aiming at a workpiece with larger diameter and high requirement on wear resistance, when the inner wall of the workpiece is subjected to surfacing repair, the problems that the welding process is not matched, deposited metal cannot be metallurgically combined with the inner wall of a cylinder body, the whole surfacing layer is peeled off, the wear resistance of the deposited metal is insufficient, the inner diameter of the workpiece is seriously shrunk and the like exist. Therefore, the existing solution is generally to replace a new cylinder, but also faces the problems of high price and high time cost; and for key core components, the problem of 'neck clamping' is faced.
Because the size of the cylinder body is larger and the cylinder wall is thinner, the selection of welding materials and the formulation of a welding process method are particularly important.
The first problem is that: welding material selection
The tungsten carbide particle wear-resistant surfacing welding wire is a common wear-resistant material with high surfacing layer hardness and the widest application. At present, the hardness of the surface of a single-layer surfacing layer of a commercially available domestic tungsten carbide surfacing welding wire cannot reach 58HRC (generally 40-55HRC), and the imported tungsten carbide surfacing welding wire is expensive and has a long supply period.
The second problem is that: welding process formulation
Due to the fact that the size of the cylinder body is large and the cylinder wall is thin, welding spatters, welding bead forming is not good, a build-up welding layer is peeled off and the like can be generated in the automatic welding process of the cylinder body.
The third problem is that: variation of barrel size
In the continuous automatic welding process, the problem of large shrinkage deformation of the cylinder body can be caused due to large welding heat input.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a surfacing welding method for the inner wall of a thin-wall cylinder, which can meet the requirement of the wear resistance of the inner wall of a large-sized thin-wall cylinder, has the advantages of small welding spatter, attractive weld joint formation, good wettability of deposited metal and a cylinder body matrix, small shrinkage deformation of the cylinder body after welding and can meet the requirement of the normal production size of a workpiece.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for welding the inner wall of a thin-wall cylinder by overlaying welding comprises the following steps:
a stainless steel surfacing layer is built on the inner wall of the cylinder body base body by utilizing a stainless steel flux-cored wire;
overlaying a tungsten carbide overlaying layer on the inner wall of the stainless steel overlaying layer by using a nickel-based tungsten carbide welding wire; wherein,
the filling rate of the nickel-based tungsten carbide welding wire is 65 percent, and the flux-cored wire of the nickel-based tungsten carbide welding wire comprises the following components in percentage by weight: 78-85% of WC, 1-10% of TiC, 1-6% of borax, 0-5% of dehydrated potash feldspar, 0-5% of high-carbon ferrochrome and 0-5% of metal molybdenum.
Further, the deposited metal of the stainless steel flux-cored wire comprises the following chemical components:
the deposited metal of the stainless steel flux-cored wire comprises the following chemical components:
c <0.12 Wt%; mn: 0.5-1.0 Wt%; si: 0.5-2.5 Wt%; s <0.03 Wt%; p <0.04 Wt%; cr: 22.0-25.0 Wt%; ni: 12.0-14.0 Wt%; mo <1.0 Wt%; cu <0.5 Wt%, and the balance Fe, for a total of 100%.
Further, in the surfacing process, an outer support flange is adopted as an outer support for the outer wall of the cylinder body, an inner support fixture is adopted as an inner support for the inner wall of the cylinder body, and the position of the inner support fixture is changed along with the welding process so as to reduce the shrinkage of the inner wall of the cylinder body.
Further, in the surfacing process, the outer wall of the cylinder body is sprayed with water for cooling, so that the temperature of the cylinder body in the welding process is controlled below 150 ℃.
Further, the welding technological parameters of the stainless steel overlaying layer are as follows: the arc voltage is 23-26V, the welding current is 190-220A, the wire feed speed is 5500-6200mm/min, the welding speed is 180-220mm/min, and the welding protective gas is 85% Ar + 15% CO 2 。
Further, the welding technological parameters of the surfacing tungsten carbide surfacing layer are as follows: the arc voltage is 16-22V, and the welding current is 120-190A.
Further, the welding technological parameters of the surfacing layer of the tungsten carbide are as follows: the wire feeding speed is 2600-.
After the technical scheme is adopted, the invention has the following beneficial effects:
1. the invention can meet the requirements of the large-scale thin-wall cylinder on wear resistance and hardness (above 58 HRC) by the self-made nickel-based tungsten carbide welding wire; the thickness of the single-layer overlaying layer can reach more than 5mm, so that the using amount of welding materials is saved; according to the actual welding condition, the components of the welding wire can be flexibly adjusted, and the supply period of the welding materials is short.
2. According to the invention, by controlling the wire feeding speed and the welding speed, the welding current and the welding voltage are stably output, and the welding wire molten drop is in a short circuit transition form, so that the welding spatter is small, the welding bead is uniform and attractive in forming, and the problems of large spatter and poor weld joint forming caused by large molten drop transition, and the problems of waste and overhigh cost caused by increased welding wire usage are avoided.
3. According to the invention, a layer of stainless steel flux-cored wire is welded on the cylinder body (carbon steel), cracks in deposited metal of the nickel-based tungsten carbide welding wire are isolated, and the phenomena that the wettability of the welding wire and the matrix is poor and welding bead blocks are peeled off due to the fact that the cracks extend to the cylinder body are avoided.
4. According to the invention, external force is applied to the outer wall of the cylinder body through the outer support flange to prevent the cylinder wall from deforming in the welding process, the inner wall of the cylinder body is supported through the inner support clamp to reduce the cylinder diameter shrinkage in the welding process, and the outer wall of the cylinder body is cooled by water spraying in the welding process to reduce the welding temperature.
Drawings
FIG. 1 is a schematic view of a weld overlay on the inner wall of a can according to the present invention.
Detailed Description
The invention provides a surfacing welding method for the inner wall of a thin-wall cylinder, and a person skilled in the art can use the contents of the method for reference and appropriately improve the technological parameters for realization. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
A method for welding the inner wall of a thin-wall cylinder by overlaying welding comprises the following steps:
s01: a stainless steel overlaying layer is overlaid on the inner wall of the cylinder body base body by using a stainless steel flux-cored wire; wherein, after the welding bead is cooled, the surface is mechanically ground and flattened, and a stainless steel overlaying layer with the thickness of 1mm is reserved; the diameter of the stainless steel flux-cored wire is 1.6 mm; the stainless steel overlaying layer isolates cracks in deposited metal of the nickel-based tungsten carbide welding wire, and the phenomena that the wettability of the welding wire and a base body is poor and a welding bead is large and peeled off caused by the fact that the cracks extend to the base body of the cylinder body are avoided, as shown in figure 1;
s02: overlaying a tungsten carbide overlaying layer on the inner wall of the stainless steel overlaying layer by using a nickel-based tungsten carbide welding wire; the hardness of the tungsten carbide overlaying layer is 55-65HRC, and the thickness is 4-6 mm;
in the surfacing process, 2 outer support flanges are adopted as outer supports on the outer wall of the cylinder body, so that the cylinder body is prevented from deforming in the welding process; 2 inner support clamps are adopted as inner supports on the inner wall of the cylinder body, and the positions of the inner support clamps are changed along with the welding process so as to reduce the shrinkage of the inner wall of the cylinder body; cooling the outer wall of the cylinder body by spraying water, and controlling the temperature of the cylinder body below 150 ℃ in the welding process;
s03: after the welding of the inner wall of the cylinder is finished, stopping water spraying and cooling, and removing the outer supporting flange; and after the cylinder is placed in the air for 12 hours, the inner support fixture is taken out, and the build-up welding of the inner wall of the cylinder is completed.
The nickel-based tungsten carbide welding wire has a filling rate of 65 percent and a welding wire diameter of 1.6mm, and the nickel-based tungsten carbide welding wire comprises the following components in percentage by weight: 78-85% of WC, 1-10% of TiC, 1-6% of borax, 0-5% of dehydrated potash feldspar, 0-5% of high-carbon ferrochrome and 0-5% of metal molybdenum.
The borax with the content of 1-6% is added, so that the metal viscosity of a welding seam can be reduced, the high-temperature fluidity can be increased, and the welding quality can be ensured; 0-5% of dehydrated potash feldspar is added to stabilize welding electric arc; the addition of 0-5% of high-carbon ferrochrome can relieve the phenomenon of carbon loss caused by high-temperature oxidative decomposition of tungsten carbide in the welding process, and the addition of 0-5% of metal molybdenum can improve the wettability of metal matrix Ni to TiC.
The deposited metal of the stainless steel flux-cored wire comprises the following chemical components:
the nickel-based tungsten carbide welding wire deposited metal comprises the following chemical components:
further, the welding technological parameters of the stainless steel overlaying layer are as follows: the arc voltage is 23-26V, the welding current is 190-220A, the wire feed speed is 5500-6200mm/min, the welding speed is 180-220mm/min, and the welding protective gas is 85% Ar + 15% CO 2 。
Further, the welding technological parameters of the surfacing layer of the tungsten carbide are as follows: the arc voltage is 16-22V, and the welding current is 120-190A. By controlling the arc voltage to be 16-22V and the welding current to be 120-190A, the problems of poor welding seam forming and poor metallurgical bonding with the stainless steel overlaying layer caused by over-low welding parameters can be avoided; on the other hand, the problems that the hardness of a surfacing layer is reduced due to serious burning loss of WC particles under overhigh welding parameters, the inner wall of the cylinder shrinks seriously and the like can be avoided.
Further, the welding technological parameters of the surfacing layer of the tungsten carbide are as follows: the wire feeding speed is 2600-. By controlling the wire feeding speed 2600-.
In order that the present invention may be more clearly understood, the following detailed description of the present invention is given with reference to specific examples.
Comparative example 1
Surfacing a layer of domestic nickel-based tungsten carbide welding wire on a cylinder body substrate, wherein the welding process parameters are as follows: the arc voltage is 17.5V, the welding current is 170A, the wire feeding speed is 3050mm/min, and the welding speed is higher110mm/min, welding protective gas is 85% Ar + 15% CO 2 . The welding process adopts internal and external support, and water spraying cooling treatment is carried out, and the temperature of the cylinder body is controlled within 150 ℃.
Comparative example No. two
A layer of self-made nickel-based tungsten carbide welding wire is overlaid on a cylinder body substrate, and the chemical composition (weight percentage) of a flux core is as follows: WC: 85%, TiC: 6% and borax: 1%, high carbon ferrochrome: 6%, molybdenum powder: 2 percent. The welding process parameters are as follows: the arc voltage is 16.5V, the welding current is 150A, the wire feeding speed is 2700mm/min, the welding speed is 135mm/min, and the welding protective gas is 85% Ar + 15% CO 2 . The welding process adopts internal and external support, and water spray cooling treatment is carried out, and the temperature of the cylinder body is controlled within 150 ℃.
Comparative example No. three
Welding a layer of stainless steel flux-cored wire on a cylinder substrate, polishing a welding channel, keeping the thickness of the welding channel to be 1mm, then overlaying a layer of domestic nickel-based tungsten carbide welding wire, wherein the welding process parameters are as follows: the arc voltage is 19V, the welding current is 165A, the wire feeding speed is 3000mm/min, the welding speed is 115mm/min, and the welding protective gas is 85% Ar + 15% CO 2 . The welding process adopts internal and external support, and water spraying cooling treatment is carried out, and the temperature of the cylinder body is controlled within 150 ℃.
Comparative example No. four
Welding a layer of certain stainless steel flux-cored wire on a cylinder body substrate, polishing a welding track, keeping the thickness of the welding track to be 1mm, then overlaying a layer of domestic nickel-based tungsten carbide welding wire, wherein the welding process parameters are as follows: the arc voltage is 16V, the welding current is 130A, the wire feeding speed is 2600mm/min, the welding speed is 100mm/min, and the welding protective gas is 85% Ar + 15% CO 2 . The welding process does not adopt inner and outer support and water spray cooling treatment.
Comparative example five
Welding a layer of stainless steel flux-cored wire on a cylinder body substrate, polishing a welding track, keeping the thickness of the welding track to be 1mm, then overlaying a layer of self-made nickel-based tungsten carbide welding wire, wherein the flux core comprises the following chemical components in percentage by weight: WC: 81%, TiC: 4% and borax: 3 percent of dehydrated potassium feldspar: 3%, high-carbon ferrochrome: 6%, molybdenum powder: 3 percent. The welding process parameters are as follows: arc voltage18V, welding current 160A, wire feeding speed 2800mm/min, welding speed 120mm/min, and welding protective gas of 85% Ar + 15% CO 2 . The welding process does not adopt internal and external support and water spray cooling treatment.
Example one
Welding a layer of stainless steel flux-cored wire on a cylinder body substrate, polishing a welding channel, keeping the thickness of the welding channel to be 1mm, then overlaying a layer of nickel-based tungsten carbide welding wire, wherein the flux-cored wire comprises the following chemical components in percentage by weight: WC: 81%, TiC: 4%, borax: 3 percent of dehydrated potassium feldspar: 3%, high-carbon ferrochrome: 6%, molybdenum powder: 3 percent. The welding process parameters are as follows: the arc voltage is 18.5V, the welding current is 160A, the wire feeding speed is 2850mm/min, the welding speed is 120mm/min, and the welding protective gas is 85% Ar + 15% CO 2 . The welding process adopts internal and external support, and water spray cooling treatment is carried out, and the temperature of the cylinder body is controlled within 150 ℃.
Example two
Welding a layer of stainless steel flux-cored wire on a cylinder body substrate, polishing a welding track, keeping the thickness of the welding track to be 1mm, then overlaying a layer of nickel-based tungsten carbide welding wire, wherein the flux core comprises the following chemical components in percentage by weight: WC: 75%, TiC: 8%, borax: 6 percent, dehydrated potassium feldspar: 7%, molybdenum powder: 4 percent. The welding process parameters are as follows: the arc voltage is 19V, the welding current is 175A, the wire feeding speed is 3000mm/min, the welding speed is 110mm/min, and the welding protective gas is 85% Ar + 15% CO 2 . The welding process adopts internal and external support, and water spraying cooling treatment is carried out, and the temperature of the cylinder body is controlled within 150 ℃.
EXAMPLE III
Welding a layer of stainless steel flux-cored wire on a cylinder body substrate, polishing a welding channel, keeping the thickness of the welding channel to be 1mm, then overlaying a layer of nickel-based tungsten carbide welding wire, wherein the flux-cored wire comprises the following chemical components in percentage by weight: WC: 81%, TiC: 5% and borax: 3 percent of dehydrated potassium feldspar: 4%, high-carbon ferrochrome: 5%, molybdenum powder: 2 percent. The welding process parameters are as follows: the arc voltage is 19V, the welding current is 160A, the wire feeding speed is 2600mm/min, the welding speed is 130mm/min, and the welding protective gas is 85% Ar + 15% CO 2 . The welding process adopts internal and external support, and carries out water spray cooling treatment, and the temperature of the cylinder body is controlled to be more than 150 DEG CAnd (4) the following steps.
Example four
Welding a layer of stainless steel flux-cored wire on a cylinder body substrate, polishing a welding track, keeping the thickness of the welding track to be 1mm, then overlaying a layer of nickel-based tungsten carbide welding wire, wherein the flux core comprises the following chemical components in percentage by weight: WC: 80%, TiC: 1% and borax: 8 percent, dehydrated potassium feldspar: 6%, high carbon ferrochrome: 2%, molybdenum powder: 3 percent. The welding process parameters are as follows: the arc voltage is 18V, the welding current is 160A, the wire feeding speed is 2800mm/min, the welding speed is 120mm/min, and the welding protective gas is 85% Ar + 15% CO 2 . The welding process adopts internal and external support, and water spray cooling treatment is carried out, and the temperature of the cylinder body is controlled within 150 ℃.
The barrel tungsten carbide weld overlay was evaluated as follows:
as can be seen from the above table, the specifications of the tungsten carbide overlay layers obtained in the first to fourth embodiments all satisfy the following conditions: the surface hardness of the tungsten carbide pile surfacing layer is above 58 HRC; the thickness of the overlaying layer is more than 5 mm; the overlaying layer does not obviously peel off; the shrinkage of the cylinder wall is less than or equal to 5mm, and the design requirement is met.
The technical problems, technical solutions and advantages of the present invention will be further described in detail with reference to the above embodiments, it should be understood that the above embodiments are only examples of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A surfacing welding method for the inner wall of a thin-wall cylinder is characterized by comprising the following steps:
a stainless steel surfacing layer is built on the inner wall of the cylinder body base body by utilizing a stainless steel flux-cored wire;
surfacing a tungsten carbide surfacing layer on the inner wall of the stainless steel surfacing layer by using a nickel-based tungsten carbide welding wire; wherein,
the filling rate of the nickel-based tungsten carbide welding wire is 65 percent, and the flux-cored wire of the nickel-based tungsten carbide welding wire comprises the following components in percentage by weight: 78-85% of WC, 1-10% of TiC, 1-6% of borax, 0-5% of dehydrated potash feldspar, 0-5% of high-carbon ferrochrome and 0-5% of metal molybdenum;
the welding technological parameters of the surfacing layer of tungsten carbide are as follows: the arc voltage is 16-22V, and the welding current is 120-190A; the wire feeding speed is 2600-.
2. The method for weld by build-up welding of the inner wall of a thin-walled cylinder according to claim 1,
the deposited metal of the stainless steel flux-cored wire comprises the following chemical components:
c <0.12 Wt%; mn: 0.5-1.0 Wt%; si: 0.5-2.5 Wt%; s <0.03 Wt%; p <0.04 Wt%; cr: 22.0-25.0 Wt%; ni: 12.0-14.0 Wt%; mo is less than 1.0 Wt%; cu <0.5 Wt%, and the balance Fe, for a total of 100%.
3. The method for weld by build-up welding of the inner wall of a thin-walled cylinder according to claim 1,
in the surfacing process, an outer support flange is adopted as an outer support for the outer wall of the cylinder body, an inner support fixture is adopted as an inner support for the inner wall of the cylinder body, and the position of the inner support fixture is continuously changed along with the welding process so as to reduce the shrinkage of the inner wall of the cylinder body.
4. The method for overlaying welding of the inner wall of the thin-walled cylinder according to claim 1,
and in the surfacing process, the outer wall of the cylinder body is sprayed with water for cooling, so that the temperature of the cylinder body is controlled below 150 ℃ in the welding process.
5. The method for weld by build-up welding of the inner wall of a thin-walled cylinder according to claim 1,
the welding technological parameters of the surfacing stainless steel layer are as follows: the arc voltage is 23-26V, the welding current is 190-m/min, welding protective gas is 85% Ar + 15% CO 2 。
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| CN101462206A (en) * | 2008-09-12 | 2009-06-24 | 郭庆虎 | Carbide alloy welding wire or welding rod as well as manufacturing method and application thereof |
| CN101653855B (en) * | 2009-08-12 | 2011-07-20 | 西安向阳航天材料股份有限公司 | Method for welding composited tube at bonding interface of carbon steel/stainless steel machinery |
| CN103008988B (en) * | 2013-01-04 | 2016-03-23 | 哈尔滨工业大学 | The method of internal joint patch weldering exempted from by a kind of anticorrosive steel pipeline |
| CN103381527B (en) * | 2013-07-06 | 2015-07-29 | 北京工业大学 | A kind of tungsten carbide strengthens iron-based abrasion resistant overlaying-welding flux-cored wire |
| CN103406689A (en) * | 2013-07-13 | 2013-11-27 | 北京工业大学 | WC particle-reinforced Ni-based MIG hardfacing flux-cored wire |
| CN103881733A (en) * | 2014-03-24 | 2014-06-25 | 济钢集团有限公司 | Wear-resistant corrosion-resistant shell of scraper |
| CN106270933A (en) * | 2015-05-13 | 2017-01-04 | 胜利油田金岛工程安装有限责任公司 | A kind of complex welding method of large aperture pipe end built-up welding corrosion resistant alloy composite steel tube |
| CN106975861B (en) * | 2016-01-19 | 2019-07-12 | 姜文辉 | A kind of hard material of tungsten carbide particle and preparation method thereof containing clad |
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