CN102489809A - Induction welding-brazing process for cladding copper onto aluminum-steel bolts - Google Patents
Induction welding-brazing process for cladding copper onto aluminum-steel bolts Download PDFInfo
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- CN102489809A CN102489809A CN2011103670478A CN201110367047A CN102489809A CN 102489809 A CN102489809 A CN 102489809A CN 2011103670478 A CN2011103670478 A CN 2011103670478A CN 201110367047 A CN201110367047 A CN 201110367047A CN 102489809 A CN102489809 A CN 102489809A
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Abstract
The invention discloses an induction welding-brazing process for cladding copper onto aluminum-steel bolts, which includes the following steps: machining a steel bolt into a flat-bottom steel bolt without nut and cleaning the surface of one end of the steel bolt; arranging a ceramic ring at the end of the steel bolt which is cleaned, feeding a copper block and a protective agent into the ceramic ring to realize induction heating and cladding copper onto the end face of the steel bolt; cleaning and drying the surface of an aluminum base and a brazing filler metal by alcohol after the aluminum base and the brazing filler metal are cleaned chemically, and coating a brazing flux layer on the surface of the aluminum base; placing the aluminum base horizontally, arranging the copper cladded end of the steel bolt on the aluminum and pressing the aluminum base vertically, and filling the brazing filler metal and the brazing flux which are cleaned on contact surfaces of the copper cladded end of the steel bolt and the aluminum base; arranging another ceramic ring assorted with the steel bolt at a contact position between the copper cladded end of the steel bolt and the aluminum base, and filling the cleaned brazing flux in the ceramic ring; and sleeving an induction heating coil at a welding end of the steel bolt to heat the same, so that welding can be completed. By the induction welding-brazing process for cladding copper onto the aluminum-steel bolts, welding between the steel bolts with the middle and small diameters and the aluminum base can be realized. In addition, the induction welding-brazing process for cladding copper onto the aluminum-steel bolts has wider applicable range to thickness of plates.
Description
Technical field
The invention belongs to the solder technology of weldable steel double-screw bolt on alloy matrix aluminum, particularly a kind of surface is the welding method of steel double-screw bolt on aluminum mother plate of cladding copper in advance.
Background technology
Aluminium and aluminium alloy because of light weight, plasticity is good, corrosion resistance is strong etc., and characteristics are widely used in various processing and manufacturings field, be to use the widest a kind of light metal at present; And steel is common, a most the most frequently used a kind of ferrous metal, and the leading position in manufacturing industry can't be shaken so far.Because of the lightweight of aluminum steel dissimilar metal structural entity, high-strength and good heat conductive electric conductivity, except fields such as aviation manufacturing are applied,, obtained extensive concern especially in the motor vehicles for civilian use industry, demonstrate good prospects for application.The use amount that increases aluminium is the important channel that automobile reduces deadweight, minimizing discharge capacity, protection environment; So in auto industry is produced; Adopt " steel+aluminium " bimetallic Welding Structure to become the light-weighted preferred option of automobile, this must relate to the connection between aluminium and two kinds of materials of steel.
Though the welding of steel aluminum dissimilar metal has developed into a stage of ripeness as a difficult point problem of welding field; But effectively welding method is but got rid of melting welding outside the welding method; Nonetheless welding fabrication is good, and the fidelity factor of the weldment that weld strength is big is still lower.With the Type of Welding of steel stud welding to aluminum mother plate as a kind of special steel aluminum dissimilar metal, the main method of molten soldering that adopts is welded, and the subject matter that welding exists has: (1) is because the fusing point of steel is higher than the fusing point of aluminium; In welding process, when aluminium was molten into liquid state fully, steel still was in solid-state; And both density differs greatly; After steel melted fully, it is inhomogeneous that liquid aluminium floats over above the molten steel behind the crystallisation by cooling composition of weld line, makes the performance of welding point reduce.At present, aluminium and steel are difficult to directly weld with melting.(2) in aluminium and alloy thereof and the steel welding process, form the Al of infusibility on the aluminum mother plate surface
2O
3(fusing point is up to 2073 ℃) oxide-film, this oxide-film also may reside in weld pool surface, and bath temperature is high more, and surface film oxide is thick more, and the existence of oxide-film hinders the combination of liquid metal, makes weld seam produce slag inclusion easily.(3) thermal conductivity of aluminium and alloy thereof and steel, linear expansion coefficient differ greatly, and the distortion of postwelding welding point is serious, and have very big residual stress to exist, and are prone to crack.In addition, the solid solubility of iron in aluminium almost nil (in the time of 225-600 ℃, the solid solubility limit of iron in aluminium is 0.01%-0.022%), and iron and aluminium can produce multiple hard and crisp intermetallic compound, like FeAl, and FeAl
2, FeAl
3, Fe
2Al
5, Fe
2Al
7And Fe
4Al
13Deng, the existence of these intermetallic compounds, increased the fragility of welding point, reduced its plasticity and toughness.At present cause the weldment welding of some shape to be difficult to implement owing to the equipment reason main method TIG/MIG arc brazing of steel arc stud welding to aluminum mother plate and the quality of weld seam also relatively poor.
Summary of the invention
The object of the present invention is to provide a kind of steel double-screw bolt and high Al-steel double-screw bolt induction melt-brazing method of aluminum mother plate bond strength of making.
The technical solution that realizes the object of the invention is: a kind of aluminium-steel double-screw bolt preplating copper induction melt-brazing method may further comprise the steps:
Step 1, with the steel double-screw bolt be processed into flat no nut style and to steel double-screw bolt one end as treating that the cladding end carries out surface clean;
Step 2, an end that cleaned at the steel double-screw bolt adds ceramic ring, in ceramic ring, puts into copper billet and protective agent and carries out eddy-current heating, makes the copper cladding at steel double-screw bolt end face, takes off this ceramic ring;
Step 3 is carried out Chemical cleaning to aluminum mother plate surface and solder respectively;
Step 4, will be through aluminum mother plate surface that step was cleaned and solder respectively with alcohol wash and dry up, at aluminum mother plate surface-coated one deck brazing flux;
Step 5 with the aluminum mother plate horizontal positioned, vertically is placed on the copper facing end of steel double-screw bolt on the aluminum mother plate and to it and applies pressure vertically downward through pressure apparatus, on the two contact-making surface, fills solder and brazing flux afterwards;
Step 6 is placed ceramic ring once more, and in ceramic ring, is filled solder on the contact position of the copper facing end of steel double-screw bolt and aluminum mother plate;
Step 7 is enclosed within steel stud welding end with load coil, and to its heating, accomplishes welding.
The present invention compared with prior art, its remarkable advantage: (1) can obtain better weldquality; (2) simple to operate, efficient obviously improves; (3) can realize the steel double-screw bolt of medium-small diameter and the welding of aluminum mother plate, applied widely to thickness of slab.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is the flow chart that copper induction melt-brazing method is covered in aluminium-steel double-screw bolt fritting.
Fig. 2 is the sketch map that copper induction melt-brazing method is covered in aluminium-steel double-screw bolt fritting.
The specific embodiment
In conjunction with Fig. 1, Fig. 2, aluminium of the present invention-steel double-screw bolt preplating copper induction melt-brazing method may further comprise the steps:
Step 1, with steel double-screw bolt 3 be processed into flat no nut style and to steel double-screw bolt 3 one ends as treating that the cladding end carries out surface clean, be about to steel double-screw bolt 3 and treat the rust cleaning of on sand paper, polishing of cladding end, and with acetone wiping oil removing.
Step 2, an end that cleaned at steel double-screw bolt 3 adds ceramic ring 5, in ceramic ring 5, puts into copper billet and protective agent and carries out eddy-current heating, makes the copper cladding at steel double-screw bolt 3 end faces, takes off this ceramic ring 5.The mass fraction of protective agent composition is respectively: 42～46% anhydrous potassium fluoride, and 23～25% potassium fluoborate, 30～35% boric anhydride, induction heating temperature are 1100～1150 ℃, copper billet thickness is 3～5mm.
Step 3 is carried out Chemical cleaning to aluminum mother plate 6 surfaces and solder respectively.May further comprise the steps when carrying out Chemical cleaning: use NaOH solution etch aluminum mother metal 6 surfaces and solder at first respectively, use mixed liquor etch aluminum mother metal 6 surfaces and the solder of nitric acid and hydrofluoric acid afterwards; Used NaOH solution concentration is 8%～11%; Time to aluminum mother plate 6 surface etchings is 8～12min; Time to the solder etch is 4～6min, and the temperature of above-mentioned etch is 40～60 ℃, and the concentration of salpeter solution is 58～64% in the mixed liquor of said nitric acid and hydrofluoric acid; Hydrofluoric acid solution concentration is 46～55%; The volume ratio of salpeter solution and hydrofluoric acid solution is (23: 1)～(25: 1), and using the time of the mixed liquor cleaning aluminum mother plate 6 of nitric acid and hydrofluoric acid is 5～7min, and the time of cleaning solder is 3～4min.
Step 4, will be through aluminum mother plate 6 surfaces that step 3 was cleaned and solder respectively with alcohol wash and dry up, at aluminum mother plate 6 surface-coated one deck brazing fluxes.
Step 5 with aluminum mother plate 6 horizontal positioned, vertically is placed on the copper facing end of steel double-screw bolt 3 on the aluminum mother plate 6 and to it and applies pressure vertically downward through pressure apparatus 4, on the two contact-making surface, fills solder and brazing flux 1 afterwards.
Step 6 is placed ceramic ring 5 once more on the contact position of the copper facing end of steel double-screw bolt 3 and aluminum mother plate 6, and in ceramic ring 5, fills solder.
Step 7 is enclosed within steel double-screw bolt 3 welding ends with load coil, and to its heating, accomplishes welding.Heating-up temperature is 570～600 ℃, and be 120～150s heat time heating time.
In the above-mentioned steps 3,4,5, the mass fraction of described solder composition is respectively: 9～11% Si, and 3～6% Cu, 5～7% Zn, 0.3% Mn, 0.04% Ti, 0.04% Yb, all the other are Al, step 4, the brazing flux described in 5 are fluoride flux K
3AlF
6-K
3AlF
4
The present invention is processed into flat no nut style with the steel double-screw bolt, before the weldering cladding process for copper is carried out in steel double-screw bolt front portion, thereby increases the wetness degree of steel double-screw bolt in aluminium liquid, and in welding process, can play the effect that suppresses the growth of steel Al intermetallic.Load coil heating steel stud end raises steel stud end temperature rapidly, and double-screw bolt makes a part and the solder fusing on mother metal surface with heat transferred mother metal and solder on every side, forms the molten bath, and the cooling after coagulation forms welding point.Adopt ceramic ring that the double-screw bolt joint of welding is protected, protect the welding process molten bath to a certain extent, help reinforcing joint simultaneously.
Below in conjunction with embodiment the present invention is done and to describe in further detail.
Embodiment 1
In conjunction with Fig. 1 and Fig. 2, be 20mm with the diameter, high 6061 aluminium sheets for the Q235 steel double-screw bolt of 60mm, 80mm * 80mm * 12mm are example.At first steel double-screw bolt 3 is treated the rust cleaning of on sand paper, polishing of cladding end, and with acetone wiping oil removing.An end that cleaned at steel double-screw bolt 3 adds ceramic ring 5, in ceramic ring 5, puts into 3mm copper billet and protective agent and carries out eddy-current heating, and heating-up temperature is 1100 ℃, makes the copper cladding at steel double-screw bolt 3 end faces; Then Chemical cleaning is carried out on aluminum mother plate 6 surfaces and solder; Concrete cleaning is: earlier with acetone wiping aluminum mother plate 6; Remove the residual machine oil of processing, using concentration again is 8% NaOH solution, to time of aluminum mother plate 6 surface etchings be 8min; Time to the solder etch is 4min, and the temperature of above-mentioned etch is 40 ℃; Mixed liquor with nitric acid and hydrofluoric acid cleans neutralization again; The concentration of salpeter solution is 58%; Hydrofluoric acid solution concentration is 42%; The volume ratio of salpeter solution and hydrofluoric acid solution is 23: 1, uses the time of the mixed liquor cleaning aluminum mother plate 5 of nitric acid and hydrofluoric acid to be 5min, and the time of cleaning solder 1 is 3min; At last with aluminum mother plate 6 surfaces with alcohol wash and dry up.After this at mother metal 6 surface-coated brazing fluxes, the brazing flux composition is K
3AlF
6, the steel double-screw bolt 3 of cladding copper is placed on the surface of aluminum mother plate 6 and puts ceramic ring 5 at the welding ends of double-screw bolt, between ceramic ring 5 and aluminum mother plate 6, add solder, the solder composition is 9% Si; 3% Cu, 5% Zn, 0.3% Mn; 0.04% Ti, 0.04% Yb, all the other are Al.High-frequency induction heating apparatus is heated the welding ends of steel double-screw bolt, and heating-up temperature is 570 ℃, and be 150s heat time heating time.In the eddy-current heating process, the steel double-screw bolt is implemented a pressure straight down, help on aluminum mother plate, producing suitable fusion penetration like this; Thereby strengthen the intensity of welding point; After aluminum mother plate 6 melts with solder, close the power supply of induction heating apparatus, make the molten bath cooled and solidified.Through detecting, shear strength is seen table 1 after the welding.
Embodiment 2
In conjunction with Fig. 1 and Fig. 2, be 20mm with the diameter, high 6061 aluminium sheets for the Q235 steel double-screw bolt of 60mm, 80mm * 80mm * 12mm are example.At first steel double-screw bolt 3 is treated the rust cleaning of on sand paper, polishing of cladding end, and with acetone wiping oil removing.An end that cleaned at steel double-screw bolt 3 adds ceramic ring 5, in ceramic ring 5, puts into 5mm copper billet and protective agent and carries out eddy-current heating, and heating-up temperature is 1150 ℃, makes the copper cladding at steel double-screw bolt 3 end faces; Then Chemical cleaning is carried out on aluminum mother plate 6 surfaces and solder; Concrete cleaning is: earlier with acetone wiping aluminum mother plate 6; Remove the residual machine oil of processing, using concentration again is 10% NaOH solution, to time of aluminum mother plate 6 surface etchings be 12min; Time to the solder etch is 6min, and the temperature of above-mentioned etch is 60 ℃; Mixed liquor with nitric acid and hydrofluoric acid cleans neutralization again; The concentration of salpeter solution is 64%; Hydrofluoric acid solution concentration is 36%; The volume ratio of salpeter solution and hydrofluoric acid solution is 25: 1, uses the time of the mixed liquor cleaning aluminum mother plate 5 of nitric acid and hydrofluoric acid to be 7min, and the time of cleaning solder 1 is 4min; At last with aluminum mother plate 6 surfaces with alcohol wash and dry up.After this at mother metal 6 surface-coated brazing fluxes, the brazing flux composition is K
3AlF
4, the steel double-screw bolt 3 of cladding copper is placed on the surface of aluminum mother plate 6 and puts ceramic ring 5 at the welding ends of double-screw bolt, between ceramic ring 5 and aluminum mother plate 6, add solder, the solder composition is 11% Si; 6% Cu, 7% Zn, 0.3% Mn; 0.04% Ti, 0.04% Yb, all the other are Al.High-frequency induction heating apparatus is heated the welding ends of steel double-screw bolt, and heating-up temperature is 600 ℃, and be 120s heat time heating time.In the eddy-current heating process, the steel double-screw bolt is implemented a pressure straight down, help on aluminum mother plate, producing suitable fusion penetration like this; Thereby strengthen the intensity of welding point; After aluminum mother plate 6 melts with solder, close the power supply of induction heating apparatus, make the molten bath cooled and solidified.Through detecting, shear strength is seen table 1 after the welding.
Embodiment 3
In conjunction with Fig. 1 and Fig. 2, be 20mm with the diameter, high 6061 aluminium sheets for the Q235 steel double-screw bolt of 60mm, 80mm * 80mm * 12mm are example.At first steel double-screw bolt 3 is treated the rust cleaning of on sand paper, polishing of cladding end, and with acetone wiping oil removing.An end that cleaned at steel double-screw bolt 3 adds ceramic ring 5, in ceramic ring 5, puts into 4mm copper billet and protective agent and carries out eddy-current heating, and heating-up temperature is 1140 ℃, makes the copper cladding at steel double-screw bolt 3 end faces; Then Chemical cleaning is carried out on aluminum mother plate 6 surfaces and solder; Concrete cleaning is: earlier with acetone wiping aluminum mother plate 6; Remove the residual machine oil of processing, using concentration again is 9% NaOH solution, to time of aluminum mother plate 6 surface etchings be 10min; Time to the solder etch is 5min, and the temperature of above-mentioned etch is 50 ℃; Mixed liquor with nitric acid and hydrofluoric acid cleans neutralization again; The concentration of salpeter solution is 60%; Hydrofluoric acid solution concentration is 40%; The volume ratio of salpeter solution and hydrofluoric acid solution is 24: 1, uses the time of the mixed liquor cleaning aluminum mother plate 5 of nitric acid and hydrofluoric acid to be 6min, and the time of cleaning solder 1 is 4min; At last with aluminum mother plate 6 surfaces with alcohol wash and dry up.After this at mother metal 6 surface-coated brazing fluxes, the brazing flux composition is K
3AlF
4, the steel double-screw bolt 3 of cladding copper is placed on the surface of aluminum mother plate 6 and puts ceramic ring 5 at the welding ends of double-screw bolt, between ceramic ring 5 and aluminum mother plate 6, add solder, the solder composition is 10% Si; 5% Cu, 6% Zn, 0.3% Mn; 0.04% Ti, 0.04% Yb, all the other are Al.High-frequency induction heating apparatus is heated the welding ends of steel double-screw bolt, and heating-up temperature is 580 ℃, and be 130s heat time heating time.In the eddy-current heating process, the steel double-screw bolt is implemented a pressure straight down, help on aluminum mother plate, producing suitable fusion penetration like this; Thereby strengthen the intensity of welding point; After aluminum mother plate 6 melts with solder, close the power supply of induction heating apparatus, make the molten bath cooled and solidified.Through detecting, shear strength is seen table 1 after the welding.
The shear strength under the molten soldering different process of copper induction is covered in table 1 aluminium-steel double-screw bolt fritting
| Heat time heating time (℃) | 570 | 580 | 600 |
| Heating-up temperature (s) | 150 | 130 | 120 |
| Shear strength (MPa) | 60.22 | 63.51 | 62.12 |
Claims (6)
1. aluminium-steel double-screw bolt preplating copper is responded to melt-brazing method, it is characterized in that may further comprise the steps:
Step 1, with steel double-screw bolt (3) be processed into flat no nut style and to steel double-screw bolt (3) one ends as treating that the cladding end carries out surface clean;
Step 2, an end that cleaned at steel double-screw bolt (3) adds ceramic ring (5), in ceramic ring (5), puts into copper billet and protective agent carries out eddy-current heating, makes the copper cladding at steel double-screw bolt (3) end face, takes off this ceramic ring (5);
Step 3 is carried out Chemical cleaning to aluminum mother plate (6) surface and solder respectively;
Step 4, aluminum mother plate (6) surface that will clean through step (3) and solder are respectively with alcohol wash and dry up, at aluminum mother plate (6) surface-coated one deck brazing flux;
Step 5 with aluminum mother plate (6) horizontal positioned, vertically is placed on aluminum mother plate (6) with the copper facing end of steel double-screw bolt (3) and goes up and it is applied pressure vertically downward through pressure apparatus (4), afterwards filling solder and brazing flux on the two contact-making surface;
Step 6 is placed ceramic ring (5) once more on the contact position of the copper facing end of steel double-screw bolt (3) and aluminum mother plate (6), and in ceramic ring (5), fills solder;
Step 7 is enclosed within steel double-screw bolt (3) welding ends with load coil, and to its heating, accomplishes welding.
2. aluminium according to claim 1-steel double-screw bolt cladding copper induction melt-brazing method is characterized in that in the step 1, and steel double-screw bolt (3) is treated the rust cleaning of on sand paper, polishing of cladding end, and with acetone wiping oil removing.
3. aluminium according to claim 1-steel double-screw bolt cladding copper induction melt-brazing method; It is characterized in that in the step 2; The mass fraction of said protective agent composition is respectively: 42～46% anhydrous potassium fluoride, 23～25% potassium fluoborate, 30～35% boric anhydride; Induction heating temperature is 1100～1150 ℃, and copper billet thickness is 3～5mm.
4. aluminium according to claim 1-steel double-screw bolt preplating copper induction melt-brazing method is characterized in that in the step 3,4,5, the mass fraction of described solder composition is respectively: 9～11% Si; 3～6% Cu, 5～7% Zn, 0.3% Mn; 0.04% Ti; 0.04% Yb, all the other are Al, step 4, the brazing flux described in 5 are fluoride flux K
3AlF
6-K
3AlF
4
5. aluminium according to claim 1-steel double-screw bolt preplating copper induction melt-brazing method; May further comprise the steps when it is characterized in that carrying out Chemical cleaning in the step 3: use NaOH solution etch aluminum mother metal (6) surface and solder at first respectively, use mixed liquor etch aluminum mother metal (6) surface and the solder of nitric acid and hydrofluoric acid afterwards; Used NaOH solution concentration is 8%～11%; Time to aluminum mother plate (6) surface etching is 8～12min; Time to the solder etch is 4～6min, and the temperature of above-mentioned etch is 40～60 ℃, and the concentration of salpeter solution is 58～64% in the mixed liquor of said nitric acid and hydrofluoric acid; Hydrofluoric acid solution concentration is 46～55%; The volume ratio of salpeter solution and hydrofluoric acid solution is (23: 1)～(25: 1), and the time of cleaning aluminum mother plate (6) with the mixed liquor of nitric acid and hydrofluoric acid is 5～7min, and the time of cleaning solder is 3～4min.
6. aluminium according to claim 1-steel double-screw bolt preplating copper induction melt-brazing method is characterized in that step 7 heating-up temperature is 570～600 ℃, and be 120～150s heat time heating time.
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|---|---|---|---|
| CN2011103670478A CN102489809A (en) | 2011-11-18 | 2011-11-18 | Induction welding-brazing process for cladding copper onto aluminum-steel bolts |
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| CN2011103670478A CN102489809A (en) | 2011-11-18 | 2011-11-18 | Induction welding-brazing process for cladding copper onto aluminum-steel bolts |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551691A (en) * | 2013-10-30 | 2014-02-05 | 贵州天义电器有限责任公司 | Soldering method of seat plate assembly, induction coil for soldering and manufacturing method of induction coil |
| CN103817390A (en) * | 2014-02-24 | 2014-05-28 | 贵州天义电器有限责任公司 | Brazing connection technology for contactor assembly |
| CN104289783A (en) * | 2013-07-18 | 2015-01-21 | 首都航天机械公司 | Brazing technology applicable to steel-aluminum dissimilar metal and brazing communicating vessel thereof |
| CN112872525A (en) * | 2019-11-29 | 2021-06-01 | 新疆众和股份有限公司 | Connecting method of guide rod and steel claw for electrolytic aluminum |
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| CN101058147A (en) * | 2007-04-20 | 2007-10-24 | 江苏双良空调设备股份有限公司 | Method for brazing aluminium parts on the carbon steel part surface and aluminizing anti-rust on the non brazing surface |
| CN102114561A (en) * | 2009-12-31 | 2011-07-06 | 南京理工大学 | Method of pre-copper-plated induction welding-brazing of aluminum-steel stud bolt |
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| CN1064637A (en) * | 1991-03-14 | 1992-09-23 | 中国有色金属工业总公司昆明贵金属研究所 | The method for welding of money base soldering paste and Silver Jewelry |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104289783A (en) * | 2013-07-18 | 2015-01-21 | 首都航天机械公司 | Brazing technology applicable to steel-aluminum dissimilar metal and brazing communicating vessel thereof |
| CN104289783B (en) * | 2013-07-18 | 2017-04-26 | 首都航天机械公司 | Brazing technology applicable to steel-aluminum dissimilar metal and brazing communicating vessel thereof |
| CN103551691A (en) * | 2013-10-30 | 2014-02-05 | 贵州天义电器有限责任公司 | Soldering method of seat plate assembly, induction coil for soldering and manufacturing method of induction coil |
| CN103551691B (en) * | 2013-10-30 | 2015-08-26 | 贵州天义电器有限责任公司 | A kind of welding method of base plate assembly, induction coil and preparation method thereof for its welding |
| CN103817390A (en) * | 2014-02-24 | 2014-05-28 | 贵州天义电器有限责任公司 | Brazing connection technology for contactor assembly |
| CN112872525A (en) * | 2019-11-29 | 2021-06-01 | 新疆众和股份有限公司 | Connecting method of guide rod and steel claw for electrolytic aluminum |
| CN112872525B (en) * | 2019-11-29 | 2022-10-14 | 新疆众和股份有限公司 | Connecting method of guide rod and steel claw for electrolytic aluminum |
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Application publication date: 20120613 |