CN113930652A - Cobalt-based welding wire for laser cladding and preparation method thereof - Google Patents
Cobalt-based welding wire for laser cladding and preparation method thereof Download PDFInfo
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- CN113930652A CN113930652A CN202111128016.7A CN202111128016A CN113930652A CN 113930652 A CN113930652 A CN 113930652A CN 202111128016 A CN202111128016 A CN 202111128016A CN 113930652 A CN113930652 A CN 113930652A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
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- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
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- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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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
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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
- B23K35/40—Making wire or rods for soldering or welding
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- C22C27/06—Alloys based on chromium
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- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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Abstract
The invention discloses a cobalt-based welding wire for laser cladding, which comprises a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 30-40% of Cr powder, 10-20% of B powder, 10-20% of Ni powder, 5-10% of ferrosilicon powder, 1-5% of TiC powder, 1-5% of WC powder and the balance of Co powder, wherein the sum of the mass percentages of the components is 100%. The welding wire can realize a high-hardness and high-wear-resistance cladding layer which is difficult to form by a solid welding wire. The invention also discloses a preparation method of the cobalt-based welding wire for laser cladding.
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a cobalt-based welding wire for laser cladding and a preparation method of the cobalt-based welding wire for laser cladding.
Background
The laser cladding technology is to irradiate the alloy/powder/wire material on the surface of the matrix by using high-energy laser beams, so that the thin layer on the surface of the matrix is rapidly melted and mixed, and an alloy cladding layer which has small dilution rate and is metallurgically combined with the matrix is formed after cooling and solidification. The laser cladding method has the advantages of high cladding layer density, good metallurgical bonding between the coating and the substrate and the like, and is one of the research hotspots of the surface strengthening technology in recent years. The common cladding materials at present are Fe, Co and Ni-based alloy powder and alloy powder added with ceramic particles. When the alloy powder is adopted for laser cladding, a coaxial powder feeding mode is generally adopted. The powder feeding mode has higher requirement on the sphericity of the powder. And the efficiency of powder laser cladding is relatively low, and the actual requirement of modern engineering on high efficiency cannot be met. The existing solid welding wires on the market are designed for conventional fusion welding, and do not have the solid welding wires for a laser cladding system.
Among them, the Co-based alloy is a material having a large amorphous forming ability, and has characteristics of high hardness, good wear resistance and corrosion resistance, and the like. The Co-based alloy cladding is carried out on the surface of the common low-carbon steel, so that the surface of the low-carbon steel can be strengthened, the wear resistance of the low-carbon steel is improved, the service life of the low-carbon steel is prolonged, the use cost is greatly saved, good economic benefits are created, and the strategic policy of sustainable development in China is met.
Aiming at the requirements, the invention aims to design and develop the special welding wire for cobalt-based laser cladding, thereby ensuring the wear resistance and corrosion resistance of conventional low-carbon steel and having obvious cladding speed.
Disclosure of Invention
The invention aims to provide a cobalt-based welding wire for laser cladding, which can realize a high-hardness and high-wear-resistance cladding layer which is difficult to form by a solid welding wire.
The invention also aims to provide a preparation method of the cobalt-based welding wire for laser cladding.
The technical scheme adopted by the invention is that the cobalt-based welding wire for laser cladding comprises a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 30-40% of Cr powder, 10-20% of B powder, 10-20% of Ni powder, 5-10% of ferrosilicon powder, 1-5% of TiC powder, 1-5% of WC powder and the balance of Co powder, wherein the sum of the mass percentages of the components is 100%.
The present invention is also characterized in that,
the granularity of Cr powder, B powder, Ni powder, ferrosilicon powder, Co powder, TiC powder and WC powder is 200-300 meshes.
The welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm.
The filling rate of the flux-cored wire powder is 30-35 wt.%.
The second technical scheme adopted by the invention is that the preparation method of the cobalt-based welding wire for laser cladding comprises the following specific steps:
step 1: respectively weighing 30-40% of Cr powder, 10-20% of B powder, 10-20% of Ni powder, 5-10% of ferrosilicon powder, 1-5% of TiC powder, 1-5% of WC powder and the balance of Co powder according to mass percent, wherein the sum of the mass percentages of the components is 100%;
step 2: placing the powder in a planetary ball mill for ball milling treatment, wherein the ball milling time of the powder is 5-6 h, and the ball milling speed is 300-400 rpm;
and step 3: performing particle size screening on the ball-milled composite powder to ensure that the screened powder is in the particle size range of 200-300 meshes;
and 4, step 4: placing the powder sieved in the step 3 into a vacuum heating furnace for heating treatment, wherein the heating temperature is 260-300 ℃, and the heat preservation time is 2-3 h;
and 5: removing grease on the surface of the cobalt strip by using alcohol, wrapping the mixed powder prepared in the step (4) in the cobalt strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6 mm;
step 6: after the first process is finished, the aperture of the die is reduced in sequence, and finally the flux-cored wire with the diameter of 1.0-1.2 mm is obtained;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The present invention is also characterized in that,
in the step 5, the welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm; the filling rate of the flux-cored wire powder is 30-35 wt.%.
The invention has the beneficial effects that:
(1) the cobalt-based welding wire is specially used for a laser cladding system, and better cladding efficiency of the welding wire in the laser cladding process can be ensured by reasonably adjusting the filling rate.
(2) The powder is prepared by a ball milling process, so that the good wrapping property of the powder can be ensured, and the powder is prevented from layering in the stretching process;
(3) the cobalt-based flux-cored wire disclosed by the invention has a tendency of forming an amorphous laser cladding layer by matching with a higher cooling speed of laser cladding.
(4) The cobalt-based flux-cored wire disclosed by the invention is added with a plurality of alloy elements, and the microstructure of a cladding layer is reasonably regulated and controlled. Hard phase particles (TiC and WC) are added into the powder, so that the cladding hardness and the cladding wear resistance can be further improved.
(5) The preparation method of the cobalt-based welding wire for laser cladding has simple process and is convenient for large-scale batch production.
Drawings
Fig. 1 is a cross-sectional view of a cladding layer obtained when laser cladding is performed on a Q345 steel plate by using a flux-cored wire prepared in embodiment 2 of the present invention;
FIG. 2 is a scanning electron microscope macroscopic structure morphology of a cladding layer obtained when the flux-cored wire prepared in embodiment 2 of the present invention is laser-clad on a Q345 steel plate;
FIG. 3 is a scanning electron microscope high power texture map of a cladding layer obtained when laser cladding is performed on a Q345 steel plate by using the flux-cored wire prepared in embodiment 2 of the invention;
fig. 4 is a friction wear topography of a cladding layer obtained when the flux-cored wire prepared in embodiment 2 of the present invention is laser-clad on a Q345 steel plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a cobalt-based welding wire for laser cladding, which comprises a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 30-40% of Cr powder, 10-20% of B powder, 10-20% of Ni powder, 5-10% of ferrosilicon powder, 1-5% of TiC powder, 1-5% of WC powder and the balance of Co powder, wherein the sum of the mass percentages of the components is 100%.
The granularity of Cr powder, B powder, Ni powder, ferrosilicon powder, Co powder, TiC powder and WC powder is 200-300 meshes.
The welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm.
The filling rate of the flux-cored wire powder is 30-35 wt.%.
The main alloy components in the flux-cored wire have the following functions and functions:
the Co element is used as a main alloy element of the flux-cored wire, and has the functions of high temperature resistance and corrosion resistance, so that the laser cladding layer mainly based on the Co element also has excellent high temperature resistance and wear resistance.
The Cr element is used as a main element of the flux-cored wire powder, and has the effects of improving the corrosion resistance and high temperature resistance of a cladding layer.
The B element is used as a main alloy element of the flux-cored wire powder, the B element is a strong deoxidizing element, and the combined action of the B element and the Si element can reduce the melting point of the cladding metal, facilitate slag removal and deoxidation, improve the fluidity of the cladding metal, improve the wettability with a base material and reduce the formation tendency of the cladding defect.
The Ni element is used as another main element of the flux-cored wire powder, so that the wettability of the cladding layer can be improved, the toughness of the cladding layer can be effectively improved, and the cracking sensitivity is reduced.
TiC powder and WC powder belong to ceramic powder, and the hardness and the wear resistance of a cladding layer can be effectively improved by adding the TiC powder and the WC powder into the powder of the cobalt-based flux-cored wire. In addition, since the above ceramic powder is added by a ball milling process, these hard phases are dispersed and distributed in the formed cladding layer. In addition, the TiC has smaller thermal expansion coefficient, lighter specific gravity and certain plasticity and toughness, so that the plasticity and toughness of the TiC powder reinforced laser cladding layer are superior to those of the traditional ceramic powder reinforced laser cladding layer.
The invention also provides a preparation method of the cobalt-based welding wire for laser cladding, which comprises the following specific steps:
step 1: respectively weighing 30-40% of Cr powder, 10-20% of B powder, 10-20% of Ni powder, 5-10% of ferrosilicon powder, 1-5% of TiC powder, 1-5% of WC powder and the balance of Co powder according to mass percent, wherein the sum of the mass percentages of the components is 100%;
step 2: placing the powder in a planetary ball mill for ball milling treatment, wherein the ball milling time of the powder is 5-6 h, and the ball milling speed is 300-400 rpm;
and step 3: performing particle size screening on the ball-milled composite powder to ensure that the screened powder is in the particle size range of 200-300 meshes;
and 4, step 4: placing the powder sieved in the step 3 into a vacuum heating furnace for heating treatment, wherein the heating temperature is 260-300 ℃, and the heat preservation time is 2-3 h;
and 5: removing grease on the surface of the cobalt strip by using alcohol, wrapping the mixed powder prepared in the step (4) in the cobalt strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6 mm;
in the step 5, the welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm; the filling rate of the flux-cored wire powder is 30-35 wt.%.
Step 6: after the first process is finished, the aperture of the die is reduced in sequence, and finally the flux-cored wire with the diameter of 1.0-1.2 mm is obtained;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
Example 1
A preparation method of a cobalt-based welding wire for laser cladding comprises the following steps:
step 1: 30% of Cr powder, 10% of B powder, 10% of Ni powder, 5% of ferrosilicon powder, 1% of TiC powder, 1% of WC powder and the balance of Co powder are weighed according to the mass percentage, and the sum of the mass percentages of the components is 100%.
Step 2: placing the powder in a planetary ball mill for ball milling treatment, wherein the ball milling time of the powder is 5h, and the ball milling speed is 300 rpm;
and step 3: screening the ball-milled composite powder to obtain 200 meshes of powder;
and 4, step 4: placing the powder sieved in the step 3 in a vacuum heating furnace for heating treatment, wherein the heating temperature is 260 ℃, and the heat preservation time is 2 hours;
and 5: removing grease on the surface of the cobalt strip by using alcohol, wrapping the mixed powder prepared in the step (4) in the cobalt strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6 mm; in the step 5, the welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm; the filling rate of the flux-cored wire powder is 30 wt.%.
Step 6: after the first process is finished, the aperture of the die is reduced in sequence, and finally the flux-cored wire with the diameter of 1.0mm is obtained;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The cobalt-based flux-cored wire for laser cladding prepared in example 1 was used to perform laser cladding on a Q345 steel plate with a laser power of 3000W, a spot diameter of 2mm, a scanning speed of 3m/min, and a wire feeding speed of 0.8 m/min.
The Rockwell hardness of the cladding metal was tested to be 52 HRC.
Example 2
A preparation method of an iron-based welding wire for laser cladding comprises the following steps:
step 1: 40% of Cr powder, 20% of B powder, 20% of Ni powder, 10% of ferrosilicon powder, 5% of TiC powder and 5% of WC powder are weighed according to the mass percentage, and the sum of the mass percentages of the components is 100%.
Step 2: placing the powder in a planetary ball mill for ball milling treatment, wherein the ball milling time of the powder is 6h, and the ball milling speed is 400 rpm;
and step 3: screening the ball-milled composite powder to obtain 300 meshes of powder;
and 4, step 4: placing the powder sieved in the step 3 into a vacuum heating furnace for heating treatment, wherein the heating temperature is 300 ℃, and the heat preservation time is 2 hours;
and 5: removing grease on the surface of the cobalt strip by using alcohol, wrapping the mixed powder prepared in the step (4) in the cobalt strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6 mm; in the step 5, the welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm; the filling rate of the flux-cored wire powder is 35 wt.%.
Step 6: after the drawing of the first process is finished, the aperture of the die is reduced in sequence, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The cobalt-based flux-cored wire for laser cladding prepared in example 2 is used for laser cladding on a Q345 steel plate, the laser power is 3000W, the spot diameter is 2mm, the scanning speed is 3m/min, and the wire feeding speed is 0.8 m/min.
The Rockwell hardness of the cladding metal was tested to be 57 HRC.
The laser cladding cobalt-based flux-cored wire prepared in example 2 is clad on a Q345 steel plate, and the cross-sectional morphology of the cladding layer is shown in FIG. 1. As can be seen from the figure, the lap joint between the layers of the cladding layer is good and no defect is generated. FIG. 2 is a macroscopic structure of the cladding layer, and it can be seen that the cladding layer is mainly based on the cellular austenite structure. From the high power tissue, hard phase particles are present between the cellular diameters as shown in FIG. 3. As can be seen from the topographic map of the frictional wear surface in FIG. 4, the cladding layer has good wear resistance, mainly adhesive wear, and good toughness matching.
Example 3
A preparation method of a cobalt-based welding wire for laser cladding comprises the following steps:
step 1: weighing 35% of Cr powder, 15% of B powder, 15% of Ni powder, 7% of ferrosilicon powder, 2% of TiC powder, 3% of WC powder and the balance of Co powder according to mass percentage, wherein the sum of the mass percentages of the components is 100%.
Step 2: placing the powder in a planetary ball mill for ball milling treatment, wherein the ball milling time of the powder is 5.5h, and the ball milling speed is 350 rpm;
and step 3: screening the ball-milled composite powder to obtain 300 meshes of powder;
and 4, step 4: placing the powder sieved in the step 3 in a vacuum heating furnace for heating treatment, wherein the heating temperature is 280 ℃, and the heat preservation time is 2 hours;
and 5: removing grease on the surface of the cobalt strip by using alcohol, wrapping the mixed powder prepared in the step (4) in the cobalt strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6 mm; in the step 5, the welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm; the filling rate of the flux-cored wire powder is 32 wt.%.
Step 6: after the first process is finished, the aperture of the die is reduced in sequence, and finally the flux-cored wire with the diameter of 1.1mm is obtained;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The cobalt-based flux-cored wire for laser cladding prepared in example 3 was used to perform laser cladding on a Q345 steel plate with a laser power of 3000W, a spot diameter of 2mm, a scanning speed of 3m/min, and a wire feeding speed of 0.8 m/min.
The Rockwell hardness of the cladding metal was tested to be 51 HRC.
Example 4
A preparation method of a cobalt-based welding wire for laser cladding comprises the following steps:
step 1: weighing 37% of Cr powder, 12% of B powder, 20% of Ni powder, 6% of ferrosilicon powder, 4% of TiC powder, 2% of WC powder and the balance of Co powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%.
Step 2: placing the powder in a planetary ball mill for ball milling treatment, wherein the ball milling time of the powder is 5.4h, and the ball milling speed is 380 rpm;
and step 3: screening the ball-milled composite powder to obtain 300 meshes of powder;
and 4, step 4: placing the powder sieved in the step 3 in a vacuum heating furnace for heating treatment, wherein the heating temperature is 270 ℃, and the heat preservation time is 3 hours;
and 5: removing grease on the surface of the cobalt strip by using alcohol, wrapping the mixed powder prepared in the step (4) in the cobalt strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6 mm;
in the step 5, the welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm; the filling rate of the flux-cored wire powder is 31 wt.%.
Step 6: after the first process is finished, the aperture of the die is reduced in sequence, and finally the flux-cored wire with the diameter of 1.0-1.2 mm is obtained;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The cobalt-based flux-cored wire for laser cladding prepared in example 4 was used to perform laser cladding on a Q345 steel plate with a laser power of 3000W, a spot diameter of 2mm, a scanning speed of 3m/min, and a wire feeding speed of 0.8 m/min.
The Rockwell hardness of the cladding metal was tested to be 54 HRC.
Example 5
A preparation method of a cobalt-based welding wire for laser cladding comprises the following steps:
step 1: weighing 35% of Cr powder, 14% of B powder, 20% of Ni powder, 6% of ferrosilicon powder, 4% of TiC powder, 2% of WC powder and the balance of Co powder according to the mass percentage, wherein the sum of the mass percentages of the components is 100%.
Step 2: placing the powder in a planetary ball mill for ball milling treatment, wherein the ball milling time of the powder is 5h, and the ball milling speed is 400 rpm;
and step 3: screening the ball-milled composite powder to obtain 200 meshes of powder;
and 4, step 4: placing the powder sieved in the step 3 in a vacuum heating furnace for heating treatment, wherein the heating temperature is 270 ℃, and the heat preservation time is 2 hours;
and 5: removing grease on the surface of the cobalt strip by using alcohol, wrapping the mixed powder prepared in the step (4) in the cobalt strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6 mm;
in the step 5, the welding skin is a pure cobalt strip, the thickness of the cobalt strip is 0.4mm, and the width of the cobalt strip is 7 mm; the filling rate of the flux-cored wire powder is 35 wt.%.
Step 6: after the drawing of the first process is finished, the aperture of the die is reduced in sequence, and finally the flux-cored wire with the diameter of 1.2mm is obtained;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
The cobalt-based flux-cored wire for laser cladding prepared in example 5 was used to perform laser cladding on a Q345 steel plate with a laser power of 3000W, a spot diameter of 2mm, a scanning speed of 3m/min, and a wire feeding speed of 0.8 m/min.
The Rockwell hardness of the cladding metal was tested to be 57 HRC.
Claims (6)
1. The cobalt-based welding wire for laser cladding is characterized by comprising a flux core and a welding skin, wherein the flux core comprises the following components in percentage by mass: 30-40% of Cr powder, 10-20% of B powder, 10-20% of Ni powder, 5-10% of ferrosilicon powder, 1-5% of TiC powder, 1-5% of WC powder and the balance of Co powder, wherein the sum of the mass percentages of the components is 100%.
2. The cobalt-based welding wire for laser cladding as claimed in claim 1, wherein the particle sizes of Cr powder, B powder, Ni powder, silicon iron powder, Co powder, TiC powder and WC powder are 200-300 mesh.
3. The cobalt-based welding wire for laser cladding, according to claim 1, wherein the welding skin is a pure cobalt band, the thickness of the cobalt band is 0.4mm, and the width of the cobalt band is 7 mm.
4. The cobalt-based welding wire for laser cladding, according to claim 1, wherein the filling rate of the flux-cored welding wire powder is 30-35 wt.%.
5. A preparation method of a cobalt-based welding wire for laser cladding is characterized by comprising the following specific steps:
step 1: respectively weighing 30-40% of Cr powder, 10-20% of B powder, 10-20% of Ni powder, 5-10% of ferrosilicon powder, 1-5% of TiC powder, 1-5% of WC powder and the balance of Co powder according to mass percent, wherein the sum of the mass percentages of the components is 100%;
step 2: placing the powder in a planetary ball mill for ball milling treatment, wherein the ball milling time of the powder is 5-6 h, and the ball milling speed is 300-400 rpm;
and step 3: performing particle size screening on the ball-milled composite powder to ensure that the screened powder is in the particle size range of 200-300 meshes;
and 4, step 4: placing the powder sieved in the step 3 into a vacuum heating furnace for heating treatment, wherein the heating temperature is 260-300 ℃, and the heat preservation time is 2-3 h;
and 5: removing grease on the surface of the cobalt strip by using alcohol, wrapping the mixed powder prepared in the step (4) in the cobalt strip by using flux-cored wire drawing equipment, wherein the aperture of a first drawing die is 2.6 mm;
step 6: after the first process is finished, the aperture of the die is reduced in sequence, and finally the flux-cored wire with the diameter of 1.0-1.2 mm is obtained;
and 7: and after the flux-cored wire is drawn, the flux-cored wire is wound on a wire reel through a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for later use.
6. The method for preparing the cobalt-based welding wire for laser cladding, according to claim 5, wherein in the step 5, the welding skin is a pure cobalt band, the thickness of the cobalt band is 0.4mm, and the width of the cobalt band is 7 mm; the filling rate of the flux-cored wire powder is 30-35 wt.%.
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