CN104741746A - Aluminum alloy stud welding method to remove oxidation film with vapor state brazing flux - Google Patents
Aluminum alloy stud welding method to remove oxidation film with vapor state brazing flux Download PDFInfo
- Publication number
- CN104741746A CN104741746A CN201510105300.0A CN201510105300A CN104741746A CN 104741746 A CN104741746 A CN 104741746A CN 201510105300 A CN201510105300 A CN 201510105300A CN 104741746 A CN104741746 A CN 104741746A
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- Prior art keywords
- welding
- stud
- brazing flux
- aluminium alloy
- alloy stud
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/20—Stud welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
Abstract
The invention discloses an aluminum alloy stud welding method to remove an oxidation film with the vapor state brazing flux. The aluminum alloy stud welding method comprises the steps that the end portion of an aluminum alloy stud is machined into a face with a 150 degrees taper angle, and clearing on the end portion and the portion of an aluminum plate to be welded is conducted; a self-designed sealing air hood is installed outside a welding gun stud jacket, and a vaporizing device is joined up at the entrance position of the air course of the sealing air hood; the aluminum plate is arranged horizontally and is connected to the ground, the stud is installed, and the welding gun are compressed at the position to be welded vertically downward; the shielding gas is opened, arc striking is prepared to conduct after normal air delivering is finished, the vapor state brazing flux is jetted through a control circuit before the moment of arc striking, and welding is completed. The aluminum alloy stud welding method has the advantages that middle and large diameter aldural stud can be welded, the application range on plate thickness is wide, the operation of the welding process is easy, the intensity of the a welded joint can reaches to 90 % that of the stud, and the fusing rate of the welding joint reaches to 100 %.
Description
Technical field
The present invention relates to a kind of welding method of Light armoured vehicle 7A52 high strength alumin ium alloy stud, particularly a kind of aluminium alloy stud welding method utilizing steam state brazing flux deoxidation film.
Background technology
Arc stud welding is a kind of by generation current between metallic stud and workpiece or form electric arc by metal molten thus the technology making stud welding on workpiece.Easy as one, efficient, low energy consumption, oligosaprobic Advanced Welding Technique, arc stud welding has been widely used in the fields such as vehicle, boats and ships, boiler, steel construction, electronics, building, medicine equipment.In the welding procedure of stud, current a kind of most popular method is arc stud solder technology, it has multiple implementation method, classify according to the difference of the presentation mode of welding energy in arc stud welding process, arc pulling type arc stud welding and capacitance energy storage electric arc stud welding two kinds of basic skills can be divided into.
In recent years, 7A52 high strength alumin ium alloy because of its there is high specific strength and specific stiffness, good processing and mechanical property, the advantage such as nonmagnetic, corrosion resisting property good, cryogenic property is good, become the ideal material in Aero-Space, Light armoured vehicle Welding Structure gradually, the problem in its welding process also receives publicity day by day.Current domestic special vehicle inside is distributed with the attached seat of a large amount of stud types, and stud welding quality in Light armoured vehicle is lower, and the more performance of welding point defect is difficult to up to standard, and production efficiency is lower.For the stud welding of aluminium alloy, owing to very easily forming the oxide-film of one deck densification at alloy surface, the oxide-film that the scale removal process only before dependence weldering is difficult to thoroughly remove, and also have in welding process secondary oxidation formation produces.Oxide-film can enter molten bath in stud welding process, has a strong impact on strength of joint.
Document " middle large diameter aluminium alloy stud study of hybrid welding technology and design of technological arrangement " reports one and slots in stud end; embed the welding method that protective agent is protected molten bath; described method adds brazing flux at stud termination fluting; in arc burning process, utilize brazing flux to react remove oxide-film; but reacted brazing flux residues among molten bath and can not remove; form slag in weld, reduce strength of joint on the contrary.Be very easy in the stud welding process of 7A52 high strength alumin ium alloy occur defects such as being mingled with, fusion rate is low, the performance impact of Welded Joints is very big.Direct welding under existing stud welding apparatus condition, the quality of weld joint of high strength alumin ium alloy stud is difficult to be guaranteed.
Summary of the invention
The object of the present invention is to provide a kind of aluminium alloy stud welding method utilizing steam state brazing flux deoxidation film.Steam state brazing flux is made to spray into protection gas hood instantaneously before striking; in welding process, utilize steam state brazing flux to remove oxide-film, increase molten bath mobility and do not stay brazing flux residue in molten bath, the method obviously can reduce weld defect; increase fusion rate and structural strength, improve welding quality.
Realizing this law goal of the invention technical solution is: a kind of aluminium alloy stud welding method utilizing steam state brazing flux deoxidation film,
Step 1, aluminium alloy stud treated that welding end is processed into the face of 150 ° of cone angles;
Step 2, preparation brazing flux, brazing flux used is by KF, AlF
3, ZnF
2, KCl 39:56:0.3:14.7 mixing by weight proportion, be dissolved in organic solvent after ball milling;
Step 3, mechanical chipping polishing is carried out to the surface of aluminium sheet and aluminium alloy stud, be bright silvery white to alloy surface, then wipe greasy dirt off by acetone clean surface;
Step 4, aluminium sheet horizontal positioned are fixed on workbench, and balanced to ground, and the chuck of welding gun end is through sealing gas hood, and aluminium alloy stud one end is arranged in the chuck of welding gun end, the treating that welding end is vertical with aluminium sheet and compress of aluminium alloy stud, and and air exclusion;
Step 5, brazing flux is loaded vapourizing unit, open protection gas;
Step 6, start arc welding gun switch, striking front opening vapourizing unit, what steam state brazing flux sprayed to aluminium alloy stud treats welding end, closes vapourizing unit, in 800-1000ms, complete welding after 50ms.
In step 2, organic solvent is ethylene glycol, and the minimum grain size of mixed-powder is between 25 ~ 40nm.
In step 4, sealing gas hood is connected with aluminium sheet, and its connecting portion adopts high-temperature flexible material (as glass-fiber-fabric).
Principle of the present invention is: a kind of aluminium alloy stud welding method utilizing steam state brazing flux deoxidation film, high-power stud welding machine is adopted to carry out aluminium alloy stud welding, after preweld cleaning work completes, welding gun is compressed at position to be welded, open protection gas, vapourizing unit is opened instantaneously before striking, steam state brazing flux enters protection gas hood, be attached to position to be welded aluminum alloy surface, start stud welding machine striking, arcing also forms molten bath, the brazing flux fusing when temperature reaches brazing flux fusing point, eliminate molten bath internal oxidition film, protective atmosphere then prevents the appearance of secondary oxidation, then stud presses down and enters molten bath, cooled and solidified, appearance of weld is good.
Compared with prior art, remarkable advantage of the present invention is:
1, steam state brazing flux can evenly adhere at position, molten bath, forms the brazing flux layer of thin film shape, removes oxide-film better and does not stay residue in molten bath;
2, steam state brazing flux has fluoride and muriatic multiple striping composition, and striping mechanism is abundanter, more thorough to molten bath protection, improves molten bath mobility;
3, fusion rate can effectively be improved, obtain better weldquality, pile welding joint performance rating mainly carries out shearing test, and test shows to adopt the stud strength of joint of the inventive method welding all can reach strength of parent more than 80%, fusion rate 100% in joint;
4, simple to operate, with low cost, efficiency significantly improves;
5, for the welding of middle major diameter stud, stud diameter can weld size span more greatly, and scope is at 12 ~ 24mm.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the flow chart of the aluminium alloy stud welding method utilizing steam state brazing flux deoxidation film.
Fig. 2 is welding system schematic diagram of the present invention.
Detailed description of the invention
Composition graphs 1, Fig. 2, a kind of aluminium alloy stud welding method utilizing steam state brazing flux deoxidation film of the present invention, comprises the following steps:
By aluminium alloy stud 1, step 1, treats that welding end is processed into the face of 150 ° of cone angles.
Step 2, preparation brazing flux, brazing flux used is by KF, AlF
3, ZnF
2, KCl routine 39:56:0.3:14.7 mixing in mass ratio, the nano-powder (bake out temperature controls at 200 DEG C) of mixed-powder to be minimum grain size be 25 ~ 40nm, the organic solvent used is ethylene glycol.Mixed-powder is mixed obtained brazing flux used with organic solvent.Elements in Organic Solvents in brazing flux can volatilize completely and remain without carbon distribution more than 500 DEG C, and position, molten bath oxide-film is removed in the complete melting of compound brazing flux composition.
Step 3, carries out mechanical chipping polishing to the surface of aluminium sheet 2 and aluminium alloy stud 1, is bright silvery white to aluminum alloy surface, then wipes greasy dirt off by acetone clean surface.
Step 4, aluminium sheet 2 horizontal positioned is fixed on workbench, and balanced to ground, the chuck 4 of welding gun end is through sealing gas hood 3, one end of aluminium alloy stud 1 is arranged in welding gun end chuck 4, the treating that welding end is vertical with aluminium sheet 2 and compress of aluminium alloy stud 1, wherein, sealing gas hood 3 is connected with aluminium sheet 2, sealing gas hood 3 has two parts to form, the position be tightly connected with aluminium sheet 2 adopts high-temperature flexible material as glass-fiber-fabric etc., and the position be connected with the chuck 4 of welding gun end adopts insulating stiff material (as polytetrafluoroethylene (PTFE) etc.).
Step 5, will make aluminium alloy stud welding brazing flux by oneself and load vapourizing unit 5 (the present invention's vapourizing unit used is high-pressure airless spraying gun), and open protection gas 7, in welding process, position to be welded protective atmosphere completely cuts off air.
Step 6, open stud welding machine 8, be adjusted to suitable welding condition, start welding switch, vapourizing unit 5 is opened instantaneously before striking, steam state brazing flux is sprayed onto surface of the work in protection gas hood, vapourizing unit 5 (brazing flux covers position to be welded completely) is closed after 50ms, electric arc is produced between stud and aluminium sheet, make mother metal welding region and stud end face local melting, when temperature reaches about 570 DEG C, the brazing flux being attached to molten bath and stud end at high temperature reacts and melts fluidify and have activity, decompose remaining oxide-film and prevent the secondary oxidation of metal in molten bath, enhance the mobility in molten bath, after arc burning 800 ~ 1000ms, stud presses down, arc extinction, molten pool metal part is extruded, define good metallurgical binding.
Brazing flux composition in the present invention, containing a kind of nonhygroscopic potassium fluoroaluminate, is removed molten bath internal oxidition film and does not produce residue, enhancing the mobility in molten bath in welding process, can obtain in stud depression phases better, that performance the is more excellent stud joint that is shaped.Stud end is processed into the face of 150 ° of cone angles, liquid brazing flux can be made evenly be attached to the gap between stud and aluminium sheet, after arcing, position, molten bath has enough brazing flux reactions to remove oxide-film, presses down the conical surface in process and evenly can extrude molten bath, form good metallurgical binding at stud.The opening time of vapourizing unit is regulated by control circuit, instantaneously steam state brazing flux is added into workpiece position in protection gas hood, and does not affect normal striking before ensureing striking.
Below in conjunction with embodiment, the present invention is described in further detail
Composition graphs 1, Fig. 2, take diameter as 18mm, the high high strength alumin ium alloy stud for 23mm, 80mm × 80mm × 16mm high strength alumin ium alloy plate is example.First before weldering, aluminium alloy plate level is fixed on workbench, aluminium sheet and aluminium alloy stud are cleared up, concrete cleaning technology is: first polish region surface to be welded and stud tapered end face until show bright metal gloss with wire brush, then use acetone wiping surface of the work with except degreasing impurity, then by aluminium sheet ground connection.7A52 high strength alumin ium alloy steam state brazing flux is added vapourizing unit; assemble protection gas hood and stud, hold welding gun and stud is vertically compressed at aluminium sheet position to be welded, open protection gas; normally supply gas after 10s and prepare striking, before striking, open vapourizing unit instantaneously spray steam state brazing flux to position to be welded.Conventional spiral shell welding procedure is carried out by parameter preset (the aluminium alloy stud welding electric current of φ 18mm is 850A, and weld interval is 1000ms).Weld rear wait within 20 seconds, to get and remove welding gun, with hairbrush cleaning stud welding position residue, complete welding.
Postwelding stud shear strength 176MPa, reaches more than 70% of strength of parent.The sample cutting plane porosity utilizing steam state brazing flux to remove oxide-film stud welding method significantly significantly reduces, and fusion rate significantly promotes, and appearance of weld is complete attractive in appearance, and on cutting plane, weld seam fusion rate can reach 100%, and does not occur being mingled with the defects such as pore.
Claims (4)
1. utilize an aluminium alloy stud welding method for steam state brazing flux deoxidation film, it is characterized in that,
Step 1, aluminium alloy stud treated that welding end is processed as the face in 150 ° of cone angles;
Step 2, preparation brazing flux, brazing flux used is by KF, AlF
3, ZnF
2, KCl 39:56:0.3:14.7 mixing by weight proportion, be dissolved in organic solvent after ball milling;
Step 3, mechanical chipping polishing is carried out to the surface of aluminium sheet and aluminium alloy stud, be bright silvery white to alloy surface, then wipe greasy dirt off by acetone clean surface;
Step 4, aluminium sheet horizontal positioned are fixed on workbench, and balanced to ground, and the chuck of welding gun end is through sealing gas hood, and aluminium alloy stud one end is arranged in the chuck of welding gun end, the treating that welding end is vertical with aluminium sheet and compress of aluminium alloy stud, and and air exclusion;
Step 5, brazing flux is loaded vapourizing unit, open protection gas;
Step 6, start arc welding gun switch, striking front opening vapourizing unit, what steam state brazing flux sprayed to aluminium alloy stud treats welding end, closes vapourizing unit, in 800-1000ms, complete welding after 50ms.
2. utilize the aluminium alloy stud welding method of steam state brazing flux deoxidation film as claimed in claim 1, it is characterized in that, in step 2, organic solvent is ethylene glycol, and the minimum grain size of mixed-powder is between 25 ~ 40nm.
3. utilize the aluminium alloy stud welding method of steam state brazing flux deoxidation film as claimed in claim 1, it is characterized in that, in step 4, sealing gas hood and aluminium sheet are tightly connected, and its connecting portion adopts high-temperature flexible material.
4. utilize the aluminium alloy stud welding method of steam state brazing flux deoxidation film as claimed in claim 3, it is characterized in that, high-temperature flexible material is glass-fiber-fabric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510105300.0A CN104741746A (en) | 2015-03-11 | 2015-03-11 | Aluminum alloy stud welding method to remove oxidation film with vapor state brazing flux |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510105300.0A CN104741746A (en) | 2015-03-11 | 2015-03-11 | Aluminum alloy stud welding method to remove oxidation film with vapor state brazing flux |
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| CN104741746A true CN104741746A (en) | 2015-07-01 |
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| CN201510105300.0A Pending CN104741746A (en) | 2015-03-11 | 2015-03-11 | Aluminum alloy stud welding method to remove oxidation film with vapor state brazing flux |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270961A (en) * | 2016-08-31 | 2017-01-04 | 贵州航天电子科技有限公司 | A kind of low-frequency test instrument panel assembly welding method |
| CN110814480A (en) * | 2019-11-14 | 2020-02-21 | 辽宁忠旺铝合金精深加工有限公司 | Stud welding method for aluminum alloy sheet metal part and large-size welding nail |
| CN113579423A (en) * | 2021-08-11 | 2021-11-02 | 长江精工钢结构(集团)股份有限公司 | Welding method for manually welding small groove of T-shaped welding seam and welding gun nozzle matched with same |
| TWI812641B (en) * | 2017-10-09 | 2023-08-21 | 列支敦斯登商喜利得股份有限公司 | Bolts and Fixing Components |
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| JPS52115762A (en) * | 1976-03-25 | 1977-09-28 | Potsupuribetsuto Fuasunaa Kk | Method of gas shielded arc stud welding |
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| JP2008012578A (en) * | 2006-07-07 | 2008-01-24 | Furukawa Sky Kk | Method for brazing mg-containing aluminum alloy and heat exchanger made of aluminum alloy assembled by using the same |
| CN202741877U (en) * | 2012-05-30 | 2013-02-20 | 浙江吉利汽车研究院有限公司杭州分公司 | Device for welding steel double-screw bolt on aluminum plate base metal |
| CN103692094A (en) * | 2013-12-23 | 2014-04-02 | 南京理工大学 | Method and device for welding studs by applying resistor-electric arc composite heat source |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52115762A (en) * | 1976-03-25 | 1977-09-28 | Potsupuribetsuto Fuasunaa Kk | Method of gas shielded arc stud welding |
| CN2107970U (en) * | 1991-12-05 | 1992-06-24 | 机械电子工业部石家庄第五十四研究所 | Aluminium stud welding device |
| JP2008012578A (en) * | 2006-07-07 | 2008-01-24 | Furukawa Sky Kk | Method for brazing mg-containing aluminum alloy and heat exchanger made of aluminum alloy assembled by using the same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270961A (en) * | 2016-08-31 | 2017-01-04 | 贵州航天电子科技有限公司 | A kind of low-frequency test instrument panel assembly welding method |
| TWI812641B (en) * | 2017-10-09 | 2023-08-21 | 列支敦斯登商喜利得股份有限公司 | Bolts and Fixing Components |
| US11958146B2 (en) | 2017-10-09 | 2024-04-16 | Hilti Aktiengesellschaft | Bolt and fastening arrangement |
| CN110814480A (en) * | 2019-11-14 | 2020-02-21 | 辽宁忠旺铝合金精深加工有限公司 | Stud welding method for aluminum alloy sheet metal part and large-size welding nail |
| CN110814480B (en) * | 2019-11-14 | 2022-03-25 | 辽宁忠旺铝合金精深加工有限公司 | Stud welding method for aluminum alloy sheet metal part and large-size welding nail |
| CN113579423A (en) * | 2021-08-11 | 2021-11-02 | 长江精工钢结构(集团)股份有限公司 | Welding method for manually welding small groove of T-shaped welding seam and welding gun nozzle matched with same |
| CN113579423B (en) * | 2021-08-11 | 2022-10-11 | 长江精工钢结构(集团)股份有限公司 | Welding method for manually welding small groove of T-shaped welding seam and welding gun nozzle matched with same |
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Application publication date: 20150701 |