CN114769944B - Copper-plating-free nano-coating welding wire and processing technology thereof - Google Patents

Copper-plating-free nano-coating welding wire and processing technology thereof Download PDF

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CN114769944B
CN114769944B CN202210048267.2A CN202210048267A CN114769944B CN 114769944 B CN114769944 B CN 114769944B CN 202210048267 A CN202210048267 A CN 202210048267A CN 114769944 B CN114769944 B CN 114769944B
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许毅
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/365Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40Making wire or rods for soldering or welding
    • B23K35/404Coated rods; Coated electrodes

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  • Mechanical Engineering (AREA)
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Abstract

The invention discloses a copper-plating-free nano-coating welding wire and a processing technology thereof, and relates to the technical field of copper-plating-free welding wires, wherein the copper-plating-free welding wire comprises a welding wire substrate and a nano-coating coated on the surface of the welding wire substrate; the nano coating comprises a first coating, a second coating and a third coating which are sequentially coated on the surface of the welding wire matrix; wherein, the first coating comprises the following raw materials: liquid sodium potassium water glass, nickel powder, aluminum powder, zinc powder, carbon nanotubes, graphene, a curing agent, diatomite, titanium dioxide and molybdenum disulfide; the second coating comprises the following raw materials: graphite, deoxidizing agent, mica, hard particles, graphene, diatomite and coupling agent; the third coating comprises the following raw materials: mold release agent, graphite, graphene, diatomite, mica and coupling agent. The invention carries out the pre-coating treatment on the basis of the traditional copper-plated welding wire production process, and the finished product is obtained by once drawing, the welding performance of the obtained welding wire is comparable to that of a copper-plated welding wire, and the abrasion of a conductive nozzle is smaller.

Description

Copper-plating-free nano-coating welding wire and processing technology thereof
Technical Field
The invention relates to the technical field of copper-free welding wires, in particular to a copper-free nano-coating welding wire and a processing technology thereof.
Background
The production of copper-free welding wires represented by Issata Sweden and Japanese shen steel has been developed for a long time, and its excellent welding quality has attracted a great deal of attention from the industry. However, there are still several fatal injuries to the copper-free welding wire: firstly, the wire feeding performance is lower than that of a copper-plated welding wire; secondly, the contact tip is severely ablated; thirdly, market price which is unacceptable to customers. Therefore, various performance indexes exceeding those of copper-plated welding wires are the main research direction of copper-free welding wires.
Disclosure of Invention
Based on the technical problems in the background technology, the invention provides the copper-plated nano-coating welding wire and the processing technology thereof, wherein the copper-plated nano-coating welding wire is prepared by selecting the components of a coating material, adopting pre-coating treatment and drawing once again, the welding performance of the obtained welding wire is comparable to that of a copper-plated welding wire, and the abrasion of a conducting nozzle is smaller.
The invention provides a copper-plating-free nano-coating welding wire, which comprises a welding wire matrix and a nano-coating coated on the surface of the welding wire matrix; the nano coating comprises a first coating, a second coating and a third coating which are sequentially coated on the surface of the welding wire matrix in a laminated manner;
Wherein, the first coating comprises the following raw materials: liquid sodium potassium water glass, nickel powder, aluminum powder, zinc powder, carbon nanotubes, graphene, a curing agent, diatomite, titanium dioxide and molybdenum disulfide;
the second coating comprises the following raw materials: graphite, deoxidizing agent, mica, hard particles, graphene, diatomite and coupling agent;
The third coating comprises the following raw materials: mold release agent, graphite, graphene, diatomite, mica and coupling agent.
Preferably, the first coating comprises the following raw materials in parts by weight: 800-1200 parts of liquid potassium sodium water glass, 80-150 parts of nickel powder, 10-50 parts of aluminum powder, 5-20 parts of zinc powder, 30-100 parts of carbon nano tube, 30-100 parts of graphene, 30-80 parts of curing agent, 20-80 parts of diatomite, 20-80 parts of titanium dioxide and 10-80 parts of molybdenum disulfide; wherein the curing agent is silicon phosphate or silicon tripolyphosphate.
Preferably, the second coating comprises the following raw materials in parts by weight: 800-1200 parts of graphite, 50-150 parts of deoxidizer, 20-80 parts of mica, 30-60 parts of hard particles, 30-100 parts of graphene, 80-120 parts of diatomite and 1-3 parts of coupling agent; wherein the deoxidizer is ferrotitanium or ferrosilicon or a combination thereof; the hard particles are one or more of titanium carbide, titanium nitride and silicon nitride; the coupling agent is silane coupling agent KH560.
Preferably, the third coating comprises the following raw materials in parts by weight: 800-1200 parts of release agent, 200-600 parts of graphite, 50-120 parts of graphene, 30-80 parts of diatomite, 30-60 parts of mica and 1-3 parts of coupling agent; wherein the coupling agent is silane coupling agent KH560.
Preferably, the total thickness of the nano coating on the surface of the welding wire matrix is 1-4 mu m.
The invention also provides a processing technology of the copper-free nano-coating welding wire, which comprises the following steps: paying off a wire rod for drawing, removing rust by peeling and reducing the diameter by a roller, selecting three continuous drawing procedures in the subsequent drawing and reducing process, adding a press coating procedure after each drawing procedure, respectively coating a first coating material, a second coating material and a third coating material on the surface of the wire after each drawing procedure by press coating, reducing the diameter to a semi-finished product of the welding wire by a plurality of drawing procedures, drawing to a finished product of the welding wire, cleaning, drying, reeling and packaging.
In the invention, the specific operation of coating the first coating material, the second coating material and the third coating material is as follows: in the subsequent drawing reducing process, three continuous drawing processes are selected, and the first coating material is press-coated after the first drawing reducing process, the second coating material is press-coated after the second drawing reducing process, and the third coating material is press-coated after the third drawing reducing process.
In the invention, in the cleaning and drying operation of the processing technology, the welding wire finished product can be cleaned and dried after being drawn, or the welding wire diameter can be adjusted to be cleaned and dried when the wire diameter of the first pass of the finished wire is drawn, and then the final palm oil reducing sizing drawing is carried out, so that the rust resistance and the surface finish of the welding wire are improved.
Preferably, the rolls are reduced to 5 to 5.5mm.
Preferably, the diameter of the semi-finished welding wire is 3-5 times of that of the finished welding wire.
Preferably, the thicknesses of the first coating material, the second coating material and the third coating material which are pressed on the surface of the steel wire are respectively 3-6 mu m, 2-7 mu m and 3-6 mu m; the total thickness is 8-15 mu m.
In the invention, if the problems of insufficient compactness and reduced rust resistance of the coating occur in the mass production process of the welding wire, the pass of the first coating material can be increased, or the pass of the roller reducing is increased before coating, and the process variation of coating is compensated by repeated coating pressing or coating under the condition of smaller wire diameter.
If the welding wire has performance change during cleaning and drying, the welding wire process is adjusted to be that after cleaning and drying, palm oil is used for sizing and drawing to strengthen the surface compactness and the roundness of the coating.
Compared with the prior art, the invention has the beneficial effects that:
1. In practice, the inventors found that the copper plating layer of the copper-plated welding wire does not completely encase the base material, but fills up the surface defect position of the welding wire, the surface is colored with a mottled copper, and the conductivity of the welding wire is core in the conductivity of the welding base material itself. Therefore, the inventor believes that the copper plating layer plays a role of a contact electrode between the welding wire base material and the contact tip, copper sulfate volatilizes in the high-temperature smelting process, and short-circuit molten drops keep running with the conductive resistance value of the base material in the welding process; the conductive electrode only plays the role of arc starting and arc striking stabilization at the beginning of welding, and the compactness of copper plating ensures the arc stabilizing effect to a greater extent. Therefore, as long as arcing is ensured without problems, materials approximating the conductivity of iron are applicable, uniform densification of the coating is critical, and conductivity stability is the core. In the invention, the inventor uses liquid potassium sodium water glass as a base to lubricate a bonding material, suppresses splashing and stabilizes electric arcs during welding, then matches with conductive materials such as nickel, aluminum, zinc, carbon materials and the like, and welding-assisting materials, also lubricates and has a ferrous material molybdenum disulfide to obtain a liquid lubricating material, after a welding wire parent metal is derusted and polished, the welding wire parent metal is subjected to reducing drawing through a die, and is pressed and coated on the surface of the welding material, so that uniform coating is realized, a priming function is realized for a coating layer, filling and filling are carried out, and effective bonding between a subsequent coating material and the welding material is ensured.
2. The mechanical property of the welding wire is caused by strain strengthening in the process of drawing the welding wire, and measures for reducing the strain strengthening defect mainly comprise: firstly, controlling the temperature of a drawing process; secondly, the lubrication environment in the drawing process is improved. Experiments prove that after the surface self-lubricating treatment is carried out on the raw materials, the surface temperature of the welding wire on the drawing equipment can be averagely reduced by about 15 degrees. According to the invention, after the first coating material is coated, the second coating material is coated immediately, graphite is taken as a base material, and a hard particle wear-resistant material dispersion strengthening matrix is added, and the coating material is combined with the first coating material to form a coating layer, so that the self-lubricating coating has a self-lubricating function, ferrotitanium and ferrosilicon deoxidizer in the coating layer and a silicon phosphate curing agent in the first coating layer are subjected to chemical reaction under a heating and pressurizing environment, the compactness of the whole coating layer is improved, and the strength of a welding wire is further improved.
3. The wear of the contact tip affects the wire feeding stability. The traditional researchers on the abrasion problem of the contact tip consider that the cause of burning the contact tip is that the strength of the contact tip is insufficient; secondly, defects such as burrs and peeling on the surface of the welding wire cause contact ignition and ablation. So that high-strength chromium pick copper contact tip products appear in the market. The inventors have concluded in practice that the cause of severe wear of the contact tips is: (1) high temperature impact: the copper-plated welding wire has good heat conducting performance, and during welding, the high temperature of a molten pool is rapidly transferred into the conductive nozzle, so that the strength of the conductive nozzle is reduced; (2) The copper plating layer and the conductive nozzle material belong to the same material, the welding property of the same material is strong, the adhesion abrasion is easy to form at high temperature, and the friction resistance is increased; (3) Burrs, peeling, surface impurities, etc. cause contact firing, ablating the contact tip. According to the recognition, the inventor adds hard particles such as titanium carbide, titanium nitride and the like into the second coating as a structural ceramic electrode material, and the ceramic electrode material has the advantages of conductivity, high strength, high temperature resistance, good dry friction performance, extremely small friction resistance when in contact with metal and no damage to a conductive nozzle; and inorganic materials with flame retardant function such as mica are added, so that the temperature transmission can be effectively prevented, and the contact tip is protected.
4. Based on multipass drawing of welding wires, the compactness of the coating is considered, a layer of third coating material is coated, a release agent is taken as a base material, conductive and wear-resistant materials are added, the wear resistance and flexibility of the coating are improved, a deep protection effect is carried out, and meanwhile, the isolation between the coating and common wire drawing powder used for later drawing is solved by utilizing the release performance of the release agent.
5. In the invention, a roller is firstly adopted to reduce the diameter, and then a sizing die is adopted to pull, scratch and size; the roller drawing is an effective means for keeping the plasticity and toughness of the raw materials unchanged, and the roller and the sizing die can be used together to effectively keep the mechanical property of the welding wire based on the defect of elliptical precision of the roller.
The inventors have worked on copper-free welding wires for many years and found that prior art copper-plated welding wires are typically drawn to a semi-finished product prior to copper plating because copper plating chemically reacts to form a tight coating structure, such as a copper plating followed by multiple passes to form an irreversible tear-resistant wire. The production of the welding wire without copper plating is similar to that of the copper plating, and the welding wire is drawn to a semi-finished product and then coated, so that the mechanical property of the welding wire is poor, the coating is not firm, and the produced welding wire has poor wire feeding performance and serious burning of the conductive nozzle. The inventor carries out practical research on the functional nano coating material independently researched and developed for many years, carries out pre-coating treatment on the basis of the traditional copper-plated welding wire production process, and draws the material once again to obtain a finished product; the invention adopts the pre-press coating treatment, the process is simple, the quality is ensured to be reliable, the three-layer structure coatings are matched with each other, the obtained nano-coating welding wire has excellent conductive stability, good rust resistance and welding assisting function, the wire feeding performance is stable, the abrasion of the conducting nozzle is small, and the production efficiency is high; the welding performance of the copper-plated welding wire is comparable to that of a copper-plated welding wire, and the production cost is equivalent to that of copper-plated welding wires, far below the copper-free welding wire on the market.
Detailed Description
The technical scheme of the invention is described in detail through specific embodiments.
Example 1 (diameter of raw material 6.5 mm)
The invention provides a copper-plating-free nano-coating welding wire, which comprises a welding wire matrix and a nano-coating coated on the surface of the welding wire matrix; the nano coating comprises a first coating, a second coating and a third coating which are sequentially coated on the surface of the welding wire matrix;
wherein, the first coating comprises the following raw materials in parts by weight: 1000 parts of liquid potassium sodium water glass, 120 parts of nickel powder, 30 parts of aluminum powder, 10 parts of zinc powder, 60 parts of carbon nano tubes, 60 parts of graphene, 50 parts of a silicon tripolyphosphate curing agent, 60 parts of diatomite, 60 parts of titanium dioxide and 50 parts of molybdenum disulfide; the preparation method comprises mixing the above materials;
The second coating comprises the following raw materials in parts by weight: 1000 parts of graphite, 100 parts of ferrotitanium deoxidizer, 50 parts of mica, 20 parts of titanium carbide, 20 parts of silicon nitride, 60 parts of graphene, 100 parts of diatomite and 560 parts of KH; the preparation method comprises mixing the above materials;
the third coating comprises the following raw materials in parts by weight: 1000 parts of wax powder, 400 parts of graphite, 70 parts of graphene, 50 parts of diatomite, 50 parts of mica and 560 parts of KH; the preparation method comprises mixing the above materials.
The processing technology of the copper-plating-free nano-coating welding wire comprises the following steps: paying off a wire rod (phi 6.5 mm) for drawing, peeling and rust removing, reducing the diameter from 6.5mm to below 5.5mm through two to three rollers, adding a press coating process after each drawing process in the first 3 drawing processes, namely, press coating a first coating material after reducing the diameter in the first drawing process, press coating a second coating material after reducing the diameter in the second drawing process, press coating a third coating material after reducing the diameter in the third drawing process, controlling the coating thickness of the first, second and third coating materials to be 3 mu m, and the welding material diameter to be about 4mm, then reducing and drawing to be 1.0mm (the nano coating thickness is 2 mu m) of a standard welding wire finished product, cleaning, drying, reeling and packaging.
Example 2 (raw material diameter 5.5 mm)
The invention provides a copper-plating-free nano-coating welding wire, which comprises a welding wire matrix and a nano-coating coated on the surface of the welding wire matrix; the nano coating comprises a first coating, a second coating and a third coating which are sequentially coated on the surface of the welding wire matrix;
Wherein, the first coating comprises the following raw materials in parts by weight: 800 parts of liquid potassium sodium water glass, 80 parts of nickel powder, 50 parts of aluminum powder, 5 parts of zinc powder, 100 parts of carbon nano tubes, 30 parts of graphene, 30 parts of a silicon tripolyphosphate curing agent, 80 parts of diatomite, 20 parts of titanium dioxide and 80 parts of molybdenum disulfide; the preparation method comprises mixing the above materials;
The second coating comprises the following raw materials in parts by weight: 800 parts of graphite, 50 parts of ferrosilicon deoxidizer, 80 parts of mica, 60 parts of titanium nitride, 100 parts of graphene, 80 parts of diatomite and 560 parts of KH; the preparation method comprises mixing the above materials;
the third coating comprises the following raw materials in parts by weight: 800 parts of wax powder, 600 parts of graphite, 50 parts of graphene, 30 parts of diatomite, 30 parts of mica and 560 parts of KH; the preparation method comprises mixing the above materials.
The processing technology of the copper-plating-free nano-coating welding wire comprises the following steps: paying off a wire rod (phi 5.5 mm) for drawing, peeling and rust removing, reducing the diameter from 5.5mm to below 5.1mm through a roller, adding a press coating process after each drawing process in the previous 3 drawing processes in the subsequent reducing drawing process, namely, press coating a first coating material after reducing the diameter in the first drawing process, press coating a second coating material after reducing the diameter in the second drawing process, press coating a third coating material after reducing the diameter in the third drawing process, controlling the coating thickness of the first, second and third coating materials to be 3 mu m, 4 mu m and 3 mu m, controlling the diameter of a welding material to be about 4.5mm, reducing the diameter, drawing to be 1.0mm (the thickness of a nano coating is 2 mu m) of a standard welding wire finished product, cleaning, drying, coiling and packaging.
Example 3 (diameter of raw material 6.5 mm)
The invention provides a copper-plating-free nano-coating welding wire, which comprises a welding wire matrix and a nano-coating coated on the surface of the welding wire matrix; the nano coating comprises a first coating, a second coating and a third coating which are sequentially coated on the surface of the welding wire matrix;
Wherein, the first coating comprises the following raw materials in parts by weight: 1200 parts of liquid potassium sodium water glass, 150 parts of nickel powder, 10 parts of aluminum powder, 20 parts of zinc powder, 30 parts of carbon nano tubes, 100 parts of graphene, 80 parts of silicon phosphate curing agent, 20 parts of diatomite, 80 parts of titanium dioxide and 10 parts of molybdenum disulfide; the preparation method comprises mixing the above materials;
The second coating comprises the following raw materials in parts by weight: 1200 parts of graphite, 150 parts of ferrotitanium deoxidizer, 20 parts of mica, 30 parts of silicon nitride, 30 parts of graphene, 120 parts of diatomite and 1 part of KH 560; the preparation method comprises mixing the above materials;
The third coating comprises the following raw materials in parts by weight: 1200 parts of wax powder, 200 parts of graphite, 120 parts of graphene, 80 parts of diatomite, 60 parts of mica and 560 parts of KH; the preparation method comprises mixing the above materials.
The processing technology of the copper-plating-free nano-coating welding wire comprises the following steps: paying off a wire rod (phi 6.5 mm) for drawing, peeling and rust removing, reducing the diameter from 6.5mm to below 5.5mm through a first roller to a second roller, firstly reducing the diameter to about 5.0mm in the process of reducing the diameter, then adding a press coating process after each drawing process in the subsequent drawing process of 3 continuous channels, namely, press coating a first coating material after reducing the diameter in the first drawing process of 3 continuous channels, press coating a second coating material after reducing the diameter in the second drawing process, press coating a third coating material after reducing the diameter in the third drawing process, controlling the coating thickness of the first, second and third coating materials to be 5 mu m, 5 mu m and 5 mu m, at the moment, reducing the diameter of the welding material to about 4.2mm, then reducing the diameter to 1.0mm (the thickness of the nano coating layer to be 3 mu m) of a standard welding wire finished product, cleaning, drying, wire winding and packaging.
The performance index of the nano-coating welding wire prepared by the invention is tested, and the performance of the nano-coating welding wire is obviously higher than that of a copper-plated welding wire.
1. The deposition mechanical property of the nano-coated welding wire is obviously higher than that of a copper-plated welding wire, and the index is based on the auxiliary function of a formula material;
2. the tensile strength of the nano-coated welding wire (ER 50-6 welding wire) reaches 580MPa (standard is more than or equal to 500 MPa), the plastic extension strength reaches 460MPa (standard is more than or equal to 400 MPa), and the impact absorption energy (KV 2) averagely reaches 86 (standard is more than or equal to 27);
3. the wire feeding performance of the nano-coated welding wire is not lower than that of a high-end copper-plated welding wire, the electric arc is stable in the arcing and welding processes, the splashing is less, and the smoke dust is small;
4. The nano-coating welding wire of the invention is formed beautiful after welding, the color of the welding bead is brighter and whiter than that of the copper-plated welding wire;
5. The melting point temperature of the molten pool is high during welding of the nano-coating welding wire, the welding speed can be improved by 10%, and the nano-coating welding wire is more suitable for heavy current welding and robot welding;
6. the nano-coating welding wire is stable and smooth in wire feeding, a chromium pick copper contact tip is not needed, and the common contact tip can be normally used.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (6)

1. The copper-plating-free nano-coating welding wire is characterized by comprising a welding wire matrix and a nano-coating coated on the surface of the welding wire matrix; the nano coating comprises a first coating, a second coating and a third coating which are sequentially coated on the surface of the welding wire matrix in a laminated manner;
the first coating comprises the following raw materials in parts by weight: 800-1200 parts of liquid potassium sodium water glass, 80-150 parts of nickel powder, 10-50 parts of aluminum powder, 5-20 parts of zinc powder, 30-100 parts of carbon nano tube, 30-100 parts of graphene, 30-80 parts of curing agent, 20-80 parts of diatomite, 20-80 parts of titanium dioxide and 10-80 parts of molybdenum disulfide; wherein the curing agent is silicon phosphate or silicon tripolyphosphate;
The second coating comprises the following raw materials in parts by weight: 800-1200 parts of graphite, 50-150 parts of deoxidizer, 20-80 parts of mica, 30-60 parts of hard particles, 30-100 parts of graphene, 80-120 parts of diatomite and 1-3 parts of coupling agent; wherein the deoxidizer is ferrotitanium or ferrosilicon or a combination thereof; the hard particles are one or more of titanium carbide, titanium nitride and silicon nitride; the coupling agent is silane coupling agent KH560;
The third coating comprises the following raw materials in parts by weight: 800-1200 parts of release agent, 200-600 parts of graphite, 50-120 parts of graphene, 30-80 parts of diatomite, 30-60 parts of mica and 1-3 parts of coupling agent; wherein the coupling agent is silane coupling agent KH560.
2. The copper-free nano-coated welding wire as defined in claim 1, wherein the total thickness of the nano-coating on the surface of the wire substrate is 1 to 4 μm.
3. A process for the production of a copper-free nano-coated welding wire according to any one of claims 1 to 2, characterized by the following steps: paying off a wire rod for drawing, removing rust by peeling and reducing the diameter by a roller, selecting three continuous drawing procedures in the subsequent drawing and reducing process, adding a press coating procedure after each drawing procedure, respectively coating a first coating material, a second coating material and a third coating material on the surface of the wire after each drawing procedure by press coating, reducing the diameter to a semi-finished product of the welding wire by a plurality of drawing procedures, drawing to a finished product of the welding wire, cleaning, drying, reeling and packaging.
4. The process for producing a copper-free nano-coated wire according to claim 3, wherein the roll is reduced to 5 to 5.5mm.
5. The process for producing a copper-free nano-coated welding wire according to claim 3, wherein the semi-finished product of the welding wire has a diameter 3 to 5 times that of the finished product of the welding wire.
6. The process for producing a copper-free nano-coated wire according to claim 3, wherein the thicknesses of the first coating, the second coating and the third coating pressed on the surface of the wire are 3 to 6 μm, 2 to 7 μm and 3 to 6 μm, respectively; the total thickness is 8-15 mu m.
CN202210048267.2A 2022-01-17 2022-01-17 Copper-plating-free nano-coating welding wire and processing technology thereof Active CN114769944B (en)

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CN107413580A (en) * 2017-06-23 2017-12-01 天津市永昌焊丝有限公司 One kind is without copper plating soldering wire coating solution coating mechanism and equipment

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CN107413580A (en) * 2017-06-23 2017-12-01 天津市永昌焊丝有限公司 One kind is without copper plating soldering wire coating solution coating mechanism and equipment

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