CN103317249B - Method for repairing anode steel stud - Google Patents
Method for repairing anode steel stud Download PDFInfo
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- CN103317249B CN103317249B CN201310295520.5A CN201310295520A CN103317249B CN 103317249 B CN103317249 B CN 103317249B CN 201310295520 A CN201310295520 A CN 201310295520A CN 103317249 B CN103317249 B CN 103317249B
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Abstract
The invention relates to a method for repairing an anode steel stud. The method for repairing the anode steel stud is characterized in that a burned steel stud head is cut by a section through gas welding, and with the design length of the steel stud head as a reference point, the cut section is longer than the burned section; a cylindrical steel bar with the same diameter as the steel stud head is prepared, one auxiliary connecting piece is arranged between the cutting face of the steel stud head and the cylindrical steel bar through vertical position welding so that the steel stud head and the cylindrical steel bar can be connected, and two same semi-circular bead weld supplement spaces are formed between the cylindrical steel bar and the cross section of the steel stud head; the two same semi-circular bead weld supplement spaces are filled with weld fillets in a bead weld mode, after the bead weld supplement space on one side is welded, the steel stud is turned over, the other bead weld supplement space is welded in a bead weld mode, and therefore repair of one steel stud is finished. The method for repairing the anode steel stud has the advantages that the anode steel stud repaired in the method is low in pressure drop, repeated repair on the anode steel stud can be achieved in the method, and production cost of electrolytic aluminum is reduced greatly.
Description
Technical field
The present invention relates to a kind of restorative procedure of anode steel claw, belong to aluminum electrolysis industry anode steel claw scaling loss maintenance technique field.
Background technology
Anode steel claw is the device that aluminium electrolysis enterprise must use in daily production, and anode steel claw comprises steel pawl body, and steel pawl body is arranged with steel pawl head.Anode steel claw is integral cast steel part, conventional anode steel claw has two kinds, one is that single row shows four steel pawl heads on steel pawl body, another kind is that double-row shows six steel pawl heads on steel pawl body, the anode steel claw of four steel pawl heads is applicable to single anode electrolytic tank, and the anode steel claw of six steel pawl heads is applicable to double anode electrolytic cell.In Aluminum Electrolysis Production, the scaling loss of steel pawl head is a kind of ubiquitous problem, and the scaling loss of arbitrary steel pawl head of anode steel claw, all can make steel pawl reuse, if scrapped, will increase the production cost of electrolytic aluminium greatly.So at aluminium electrolysis enterprise, arbitrary steel pawl head scaling loss all can be repaired.Due to anode steel claw steel pawl head between spacing less than 20 ㎝, can mutually interference during reparation, so cannot repair by mach method.
Traditional restorative procedure is weld all around method; weld all around method slices off by the steel pawl head part of gas welding by scaling loss; raw steel pawl head cut surface is docked with steel pawl feed supplement part (one section of cylindrical steel rods); then enclose along the interface weld all around one after both docking with carbon dioxide gas arc welding, the two is welded together.There is following problem in this kind of extensive method for maintaining: after 1, under steel pawl head scaling loss part gas welding, cut surface is uneven, the contact of steel pawl feed supplement part and steel pawl head cut surface is not close contact, but although steel pawl feed supplement part end face is smooth contact with steel pawl head cut surface after, there is very large gap in contact surface.After weld all around, just periphery one circle can reach conductive effect, and the inside is because the uneven contact in two sides is bad, conductive area greatly reduces, electric conductivity extreme difference, so the anode steel claw after maintenance can be caused to increase much with new anode steel claw phase specific pressure drop, power consumption also increases thereupon; 2, the periphery weld all around one of the steel pawl head after cutting and steel pawl feed supplement part contact site is just enclosed by weld all around welding, and weldering meat is less, insufficient strength, and in Aluminum Electrolysis Production, steel pawl feed supplement part is easy to come off, and falls in the electrolytic cell of work, causes production accident; 3, generally, aluminium manufacturer is after employing weld all around method keeps in repair the half pawl head of same steel pawl, this steel pawl will be scrapped, this is mainly because the pressure drop adopting this kind of method to increase is a lot, if after all pawl head is all repaired by the method, the cost adjusting its power consumption will be far longer than the cost more renewing steel pawl, so adopt weld all around method also can only be the of short duration prolongation steel pawl life-span, reach the basic object solving steel pawl burning problems.
Because weld all around method exists many defects, in recent years mechanism is had to devise a kind of founding welding technology to keep in repair anode steel claw, founding welding technology slices off by the steel pawl head part of gas welding by scaling loss, then will the steel pawl repaired be needed to be placed on special frock, steel pawl head after dicing arranges a crystallizer, one section of rod iron is placed in crystallizer, adopt founding soldering equipment, rod iron is melted, utilize together with the molten steel melted to cast with the steel pawl first melt of damage by crystallizer, until reach the height needed for steel pawl head.There is following problem in founding repair welding recovering technology: 1, founding soldering equipment is comparatively large, and site requirements is strict.Founding weldering complete equipment is one and takes up an area about 80 flat main equipments, so have strict requirement to the size in place, because founding soldering equipment needs supporting large-scale water-cooling system, so require that place is equipped with the power supply of larger capacity and upper and lower water; 2, equipment investment is large, and operating cost is high.This equipment because of auxiliary facility more, main equipment is comparatively large, so the input of equipment is comparatively large, and is in operation and needs a large amount of electric power supports, power consumption is large, and required raw material is worth high; 3, security is not high.This equipment body is steel construction framework, is numerous and diverse electric utility under the workbench of steel, just likely produces electric leakage accident, have great threat to the personal safety of staff once the accident collided, weight falls.
Aluminum electrolysis industry is highly energy-consuming trade, in Aluminum Electrolysis Production, power consumption is the important composition forming electrolytic aluminium cost, no matter so adopt which kind of restorative procedure, aluminium manufacturer is outside the defect getting rid of restorative procedure itself, the problem of pressure drop of the steel pawl that what the most worth aluminium manufacturer paid close attention to is exactly after repairing, if pressure drop increases a lot, just means that power consumption can increase greatly, this is the most disadvantageous to aluminum electrolysis industry, because power consumption increases the cost that can increase electrolytic aluminium greatly.So, carry out pressure fall-off test (same position, under same temperature) by with the steel pawl of presented hereinbefore two kinds of method reparations, then compare with new steel pawl and draw following data:
From data, the pressure drop increase of the steel pawl after adopting weld all around Process to repair is higher, and pressure drop often increases by 0.1 millivolt, and power consumption will increase a lot, so adopt steel pawl the having the greatest impact to Aluminum Electrolysis Production after the reparation of weld all around Process.And founding welding technology repair after the pressure drop of steel pawl increase repair compared with weld all around Process after lower, so be considered at present leading recovery technique both at home and abroad.But as can be seen from the above table, adopt the pressure drop of the pressure drop newer steel pawl of the steel pawl of founding welding technology reparation also to have obvious increase.In order to analyze the reason that its pressure drop increases, we carry out vertical profile research to the pawl head of the steel pawl after the reparation of employing founding welding technology, find that the binding end after steel pawl head cut surface and rod iron hot melt has crackle, this crackle is the reason that the steel pawl electric conductivity after causing reparation declines.Theoretically, steel pawl head cut surface, while melting rod iron, also can melt by founding soldering equipment, makes the two be closely linked.We think by analysis, and rod iron temperature in fusing recrystallization process is higher, and the steel pawl head after cutting is cut surface melted by heat, and its underpart temperature is lower, so create crackle because upper and lower temperature contrast is comparatively large in molten steel crystal process.
Summary of the invention
The object of the invention is the defect for existing steel pawl method for maintaining, there is provided a kind of low without the need to special equipment, cost, repair after anode steel claw pressure drop increase little, power consumption is few, quality good, and can to the restorative procedure of the anode steel claw that steel pawl is repeatedly repaired.
The object of the invention is to realize in the following manner:
The steel pawl head gas welding of scaling loss is sliced off one section, and from the design length meter of steel pawl head, the length of the section of slicing off is greater than the length of scaling loss section; Prepare one section and the isodiametric cylindrical steel rods of steel pawl head, a slice assisted brace vertical position welding at the middle part of steel pawl head cut surface, the middle part of cylindrical steel rods end face and auxiliary brace are welded to connect, make the residue section of the rear steel pawl head of cylindrical steel rods and cutting concentric, the length of described auxiliary brace is consistent with steel pawl head diameter, width is 25 ~ 30 millimeters, thickness is 3 ± 0.3 millimeters, and after connecting, the length of steel pawl head equals the design length of steel pawl head; After auxiliary brace welds with cylindrical steel rods and steel pawl head section, form two semicircular body spaces that a upper end is steel pawl head section, lower end is cylindrical steel rods solder side, centre is separated by by auxiliary brace, this semicircular body space is called that built-up welding supplements space; With welding method, built-up welding is supplemented space weldering meat to pile with, built-up welding supplement after space is soldered, by steel pawl turn-over, adopt same welding method another built-up welding to be supplemented space welding complete, the reparation of a steel pawl completes.
The optimum Cutting length of the section of slicing off of described steel pawl head is in the design length of steel pawl head: be 165 ~ 170 millimeters;
The optimum length of cylindrical steel rods is 140 millimeters.
Advantage of the present invention is: this method is applied among the maintenance of steel pawl, following advantage is had: the steel pawl head after cutting is combined closely with cylindrical steel rods compared to the reparation of employing weld all around method, after cut sections for microscopic examination are done to the steel pawl head after the welding of employing this method, adopt this kind of method, there is not the rear rough surface of a wound of steel pawl head scaling loss part cutting, steel pawl head after cutting and cylindrical steel rods weld together by weldering meat completely closely, add conductive area, thus reduce pressure drop, decrease power consumption; Weld meat full, reliable welding quality, there will not be the accident turned around simultaneously;
Compared to founding weldering, site requirements is lower, does not need large-area place; Place only needs common industrial power, does not need to be equipped with special water cooling system up and down and electrical system; Operating cost relative moderate; And also far below the steel pawl that founding welding technology is repaired in pressure drop, close to the pressure drop of new steel pawl.
Not only pressure drop is little for the anode steel claw repaired by this method, and repeatedly can repair with this method antianode steel pawl, greatly reduces the production cost of electrolytic aluminium.
Accompanying drawing explanation
Fig. 1 is the steel pawl schematic diagram after adopting method of the present invention to repair;
Fig. 2 is that steel pawl repairs schematic diagram.
In figure: 1, steel pawl body, 2, steel pawl head cutting section, 3, built-up welding weldering meat, 4, cylindrical steel rods, 5, auxiliary brace, 6, built-up welding supplements space
Detailed description of the invention
Embodiment
Anode steel claw for single four steel pawl heads of certain aluminium manufacturer is repaired, restorative procedure is: with reference to accompanying drawing, the steel pawl head gas welding of scaling loss on steel pawl body 1 is sliced off one section, the Cutting Length of the section of slicing off is in the design length of steel pawl head: be 165 ~ 170 millimeters, prepare one section with the cylindrical steel rods 4 of the isodiametric length of steel pawl head 140 millimeters, a slice assisted brace 5 vertical position welding at the middle part of steel pawl head cutting section 2, the middle part of cylindrical steel rods end face and auxiliary brace are welded to connect, make the residue section of the rear steel pawl head of cylindrical steel rods and cutting concentric, the length of auxiliary brace is consistent with steel pawl head diameter, width is 25 ~ 30 millimeters, thickness is 3 millimeters, after connecting, the length of steel pawl head equals the design length of steel pawl head, after auxiliary brace welds with cylindrical steel rods and steel pawl head section, form two semicircular body spaces that a upper end is steel pawl head section, lower end is cylindrical steel rods solder side, centre is separated by by auxiliary brace, this semicircular body space is called that built-up welding supplements space 6, the height that built-up welding supplements space equals the width of auxiliary brace, that is: 25 ~ 30 millimeters, built-up welding supplemented space built-up welding weldering meat 3 with welding method to pile with, built-up welding supplement after space is soldered, by steel pawl body turn-over, adopt same welding method another built-up welding to be supplemented space and weld complete, the reparation of a steel pawl completes.The effect of auxiliary brace first cylindrical steel rods is connected location with steel pawl head cutting section before built-up welding, controls the flow direction of built-up welding molten iron in built-up welding.The thickness of auxiliary brace selects 3 millimeter, is because auxiliary brace is too thick, is not easy through welding, there will be twice weld seam, affect surfacing quality when being connected with cylindrical steel rods and steel pawl head cutting section; Auxiliary brace is too thin, insufficient strength, easily misplaces, affect steel pawl repairing quality when connecting cylinder shape rod iron and steel pawl head cutting section.Cylindrical steel rods selects 140 millimeters long, is that is the scaling loss length of steel pawl head can not more than 140 millimeters because effective use length of steel pawl head is no more than 140 millimeters in anode steel claw work.And the anode steel claw after repairing, its built-up welding section, after effectively using length, is opened outside tapping pawl head diameter even if there is built-up welding to weld meat in repairing, and does not also affect the normal use of steel pawl.
Open the situation generation of tapping outside pawl head diameter to prevent having built-up welding to weld meat in weld deposit process, between the welding ends and steel pawl head cutting section of cylindrical steel rods, overlap the metal coating ring of an opening before built-up welding, then carry out built-up welding, built-up welding effect is better.
Steel pawl head after the reparation of antianode steel pawl carries out cut sections for microscopic examination: weldering meat is full, be connected firmly, inner without any crackle.
Here is to adopting the anode steel claw of the inventive method reparation to sample, the anode steel claw repaired with other restorative procedure, and new steel pawl carries out pressure fall-off test, and experimental data is listed as follows (pressure fall-off test is all under same position and same temperature):
As can be seen from experimental data we, adopt this method, last voltage drop value far below weld all around method and fusion-casting welding technique, only a little more than new steel pawl, so adopt this method for maintaining superiority apparent.
Claims (4)
1. a restorative procedure for anode steel claw, the steel pawl head gas welding of scaling loss is sliced off one section, and from the design length meter of steel pawl head, the length of the section of slicing off is greater than the length of scaling loss section; Prepare one section and the isodiametric cylindrical steel rods of steel pawl head, it is characterized in that: a slice assisted brace vertical position welding at the middle part of steel pawl head cut surface, the middle part of cylindrical steel rods end face and auxiliary brace are welded to connect, make the residue section of the rear steel pawl head of cylindrical steel rods and cutting concentric, the length of described auxiliary brace is consistent with steel pawl head diameter, width is 25 ~ 30 millimeters, thickness is 3 ± 0.3 millimeters, and after connecting, the length of steel pawl head equals the design length of steel pawl head; After auxiliary brace welds with cylindrical steel rods and steel pawl head section, form two semicircular body spaces that a upper end is steel pawl head section, lower end is cylindrical steel rods solder side, centre is separated by by auxiliary brace, this semicircular body space is called that built-up welding supplements space; With welding method, built-up welding is supplemented space weldering meat to pile with, built-up welding supplement after space is soldered, by steel pawl turn-over, adopt same welding method another built-up welding to be supplemented space welding complete, the reparation of a steel pawl completes.
2. the restorative procedure of anode steel claw according to claim 1, is characterized in that: the Cutting Length of the section of slicing off of described steel pawl head is in the design length of steel pawl head: be 165 ~ 170 millimeters.
3. the restorative procedure of anode steel claw according to claim 2, is characterized in that: the length of cylindrical steel rods is 140 millimeters.
4. the restorative procedure of anode steel claw according to claim 1, is characterized in that: the metal coating ring overlapping an opening before built-up welding between the welding ends and steel pawl head cutting section of cylindrical steel rods, then carries out built-up welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310295520.5A CN103317249B (en) | 2013-07-15 | 2013-07-15 | Method for repairing anode steel stud |
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| CN201310295520.5A CN103317249B (en) | 2013-07-15 | 2013-07-15 | Method for repairing anode steel stud |
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| CN103317249B true CN103317249B (en) | 2015-06-24 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103769772B (en) * | 2014-01-15 | 2016-04-27 | 王会智 | A kind of anode steel claw welding method |
| CN103993334A (en) * | 2014-05-08 | 2014-08-20 | 包头市中硕焊接科技有限公司 | Cathode steel bar and aluminum soft tape connection method for electrolytic cell |
| CN105345223B (en) * | 2015-12-02 | 2017-09-29 | 华北水利水电大学 | A kind of automatic welding restorative procedure for anode steel claw head |
| CN105382408B (en) * | 2015-12-02 | 2017-08-29 | 华北水利水电大学 | A kind of electroslag welding restorative procedure for anode steel claw head |
| CN108422196B (en) * | 2017-12-30 | 2023-08-18 | 贵阳铝镁设计研究院有限公司 | Automatic repairing unit for aluminum electrolysis anode steel claw and repairing method thereof |
| CN108326461B (en) * | 2018-03-02 | 2023-09-22 | 华北水利水电大学 | Brazing repair method for improving conductivity of anode steel claw |
| CN111992867A (en) * | 2020-10-16 | 2020-11-27 | 贵州盘江精煤股份有限公司 | Mesh welding machine electrode tip and welding method thereof |
| EP4206362A1 (en) * | 2021-12-29 | 2023-07-05 | Dubai Aluminium PJSC | Method and installation for the maintenance of an anode yoke of a hall-héroult cell |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51103812A (en) * | 1975-03-10 | 1976-09-14 | Showa Denko Kk | Anoodosupaikuno hoshuhoho |
| SU1452861A2 (en) * | 1987-01-08 | 1989-01-23 | Иркутский Филиал Всесоюзного Научно-Исследовательского И Проектного Института Алюминиевой,Магниевой И Электродной Промышленности | Mechanized line for restoring steel-aluminium anode pins |
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| AU769455B2 (en) * | 1998-12-08 | 2004-01-29 | Malcolm Manwaring | Improvements in repair of aluminium smelting apparatus |
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