CN103273211B - Magnesium alloy flux-cored brazing wire and preparation method thereof - Google Patents
Magnesium alloy flux-cored brazing wire and preparation method thereof Download PDFInfo
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- CN103273211B CN103273211B CN201310215740.2A CN201310215740A CN103273211B CN 103273211 B CN103273211 B CN 103273211B CN 201310215740 A CN201310215740 A CN 201310215740A CN 103273211 B CN103273211 B CN 103273211B
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Abstract
The invention relates to a magnesium alloy flux-cored brazing wire and a preparation method thereof and belongs to the technical field of magnesium alloy welding materials. A magnesium ribbon is used as a coating layer, flux-cored component is wrapped in the coating layer, the magnesium ribbon is 8-16mm in width and 0.3-0.5mm in thickness. The flux-cored component comprises, by mass percent, 30-56% of Zn powder, 2.5-7% of Al powder, 5-7% of AlF6, 30-50% of KCl*MgCl2*6H2O, and zero of or the balance of magnesium powder, wherein powder filling rate is 50-60%. After flame brazing, furnace brazing and TIG molten brazing, brazing joints are high in shearing strength.
Description
Technical field
The invention belongs to magnesium alloy welding material technical field, be specifically related to a kind of magnesium alloy medicine core solder and preparation method thereof.
Background technology
Magnesium alloy is structural material the lightest in commercial Application, has higher specific strength, specific stiffness and good processing characteristics, can be widely used in, in Aero-Space, automobile, motorcycle and electronic product, being described as green engineering structural material.In recent years, take magnesium alloy as the light metal material sudden emergence of representative, with the speed sustainable growth of annual 20%.The connection of magnesium alloy causes the attention of people gradually.Magnesium alloy can weld by various method, as MIG weldering, TIG weldering and Laser Welding etc.Soldering due to welding deformation little, little to mother metal performance impact, can realize precision welding, be connect one of conventional method of magnesium alloy.
Apply more magnesium alloy both at home and abroad in the industry and mainly contain following 4 series: AZ series, as Mg-Al-Zn; AM series, as Mg-Al-Mn; AS series, as Mg-Al-Si and AE series, as Mg-Al-RE.
For different magnesium alloys series, have developed different magnesium alloy brazing filler metals.The business solder that can be used for magnesium alloy brazing at present that " soldering handbook " that American Welding Society (AWS) writes is enumerated has BMg-1, BMg-2a (test material association of the U.S. trade mark is AZ92A and AZ125 respectively).Above two kinds of solders are all suitable for gas brazing, furnace brazing and dip brazing.But these two kinds of solder fusing points are higher, the brazing flux melting temperature be equipped with is higher (about 538 DEG C) also, exceed burning-point and the melting temperature of most magnesium alloy, therefore be only suitable for a small amount of several magnesium alloys such as soldering AZ10A, K1A and M1A, be not suitable for that soldering is applied as magnesium alloys such as Mg-Al-Zn systems.The composition of the MC3 standard magnesium alloy brazing filler metal of Japan is in close proximity to the BMg-1 of the U.S., but the temperature range of this solder is 605 ~ 615 DEG C, and this brazing temperature is too high.The In-Mg-Zn-Al solder of the new research and development of Japan, its brazing filler metal melts temperature range is at 449 ~ 490 DEG C.Containing a large amount of precious metal In in this solder, wherein the mass percent of In reaches 65%, substantially increases solder cost.About the soldering of magnesium alloy only lists Mg-Al-Zn solder in " welding handbook " that welding society of Chinese Mechanical Engineering Society writes, its composition is Al12%, Zn0.5%, Be0.005%, Mg surplus, and other related contents are few.
Application number a kind of Mg-Zn magnesium alloy brazing material that has been the patented invention of 200910092586.8, application number a kind of magnesium alloy middle temperature brazing material that has been the patented invention of 200810116505.9, its solder Main Ingredients and Appearance is Al:1 ~ 2.5%, Zn:46 ~ 52%, surplus is Mg, application number a kind of Zn-Mg-Al magnesium alloy brazing material that has been the patented invention of 200910092580.0, application number a kind of Zn-Mg magnesium alloy brazing material that has been the patented invention of 200910092579.8.This several brazing material is mainly used in the welding of AZ series magnesium alloy, and the shear strength of its welding point is no more than 72MPa, differs far away with the tensile strength (being about 280MPa) of magnesium alloy itself.To be the patented invention of 200910092578.3 a kind of for application number containing the magnesium alloy brazing material of rare earth Nd.A kind of rare earth Er contained magnesium alloy brazing filler metal of the patented invention of application number 201110105638.5.
Above-mentioned patent is all prepare magnesium alloy brazing filler metal by the method for melting.The magnesium alloy brazing filler metal prepared mostly needs after being machined to bulk or being bar-shaped for soldering.
With regard to magnesium alloy brazing filler metal preparation, the preparation method of current magnesium alloy brazing filler metal mainly contains smelting process, resistance furnace fusion method, crucible melting method etc. in flux protection method, industrial intermediate frequency or industrial-frequency induction smelting furnace.In these preparation methods, be and different-alloy ingot is heated to molten state, after alloy melts completely, adopt churned mechanically method to stir, come out of the stove after leaving standstill a period of time.
Above-mentionedly prepare in the method for solder, owing to adopting protective atmosphere, as flux or protective gas, these protective mediums also can enter into solder more or less, become the impurity in solder, affect the soldered fitting performance of solder.As in flux protection method, the refining flux of employing is mainly by MgCl
2, KCl, CaF
2, BaCl
2mix composition by a certain percentage Deng halogen, the Main Ingredients and Appearance of flux is suitable with the density of magnesium alloy brazing filler metal, if flux consumption is improper or refining is improper, the possibility forming flux field trash in soldering also can increase.Field trash wide variety in magnesium alloy brazing filler metal, non-metallic inclusion or metallic inclusion is divided into again according to composition is different with structure, on the matrix that these field trashes generally remain in magnesium alloy brazing filler metal with the form of film-form, particle shape or tufted or crystal boundary, not only reduce the fracture toughness of the mechanical property of magnesium alloy brazing filler metal but also alloy, fatigue behaviour and chemical property and all have a strong impact on.
The magnesium alloy brazing filler metal prepared with said method stirs owing to adopting churned mechanically method, also will leave standstill subsequently, there is the problem that alloy composition segregation, coarse grains, composition are uneven.If containing trace alloying element in solder, during as rare earth element, because rare earth is generally heavy metal element, its density is much larger than the density of magnesium alloy, easily be deposited on the bottom of molten solder, also exist rare earth can not Dispersed precipitate in the situation of solder, cause soldered fitting performance unstable.Magnesium alloy brazing filler metal will through the long period leave standstill, production efficiency is lower.Adopt the above-mentioned method preparing magnesium alloy brazing filler metal to prepare magnesium alloy, sometimes for obtaining uniform formation, also will heat-treat, reduce further production efficiency.In addition, solder is heating alloys ingot in crucible, obtains solder after condensation.The solder obtained by this method is when heating alloys ingot, heating-up temperature exceedes 30 ~ 50 DEG C of liquidus curve, because each element fusing point is different in cooling procedure, has successively when solidifying, have serious segregation phenomena, there is the problem of brazing quality shakiness in made solder in brazing process.
Also there are the following problems for the method for employing conventional metallurgical melting: (1) heat time is long; (2) more responsive to solder cast temperature; (3) in melting solder process, careless slightly, fused solution metal is easily burnt human body.(4) brazing flux need be prepared separately, just can ensure carrying out smoothly of brazing process.
Summary of the invention
The invention provides a kind of magnesium alloy Mg-Zn-Al flux cored colder wire and preparation method thereof, overcome the shortcoming of conventional metallurgical melting solder, have that preparation technology is simple, easy to adjust, can prepare different-diameter according to actual parts size during soldering cored solder wire of filling a prescription, in brazing process, can arbitrarily intercept the advantages such as the length of solder wire as required.
The invention provides a kind of magnesium alloy medication core cored solder wire, be applicable to flame solder, TIG melts soldering and solder in stove, it is characterized in that, adopt magnesium ribbon as clad, by medicine core component parcel wherein, the width of magnesium ribbon is 8-16mm, and thickness is 0.3-0.5mm; In medicine core, the mass percent of each component is: the mass percent of Zn powder is the mass percent of 30-56%, Al powder is 2.5-7%, Na
3alF
6mass percent be 5-7%, KClMgCl
26H
2the mass percent of O is 30-50%, and magnesium powder is 0 or surplus; The filling rate of powder is 50%-60%.The diameter of medicine core cored solder wire is 0.8-3.0mm.
In magnesium alloy medicine core cored solder wire provided by the present invention, the effect of various component is as follows:
Zn: the fusing point significantly reducing magnesium alloy brazing filler metal.Increase the solubility of Al in Mg, improve the solution strengthening effect of Al.
Al:Al and Mg forms limit solid solution; Improve the mobility of cored solder wire in brazing process and improve wetability.
Na
3alF
6: alkali metal fluoride, as activator, plays in brazing process and melts magnesian effect.
KClMgCl
26H
2o: activator, has the magnesian ability of strong melting, and its fusion temperature is applicable to soldering and uses.
The preparation method of magnesium alloy medicine core cored solder wire provided by the present invention, comprises the following steps:
(1) by the Zn powder of proper proportion, Al powder, Na
3alF
6, KClMgCl
26H
2o etc. are mixed in proportion, and adopt meal mixer mixing.
(2) after powder mixes, bake out temperature is 120 DEG C, dries 2 hours.
(3) powder after oven dry is positioned in flux-cored wire former
(4) magnesium ribbon is rolled into U-shaped, then in U-lag, add the powder mixed accounting for cored solder wire gross weight 50% ~ 60% of the present invention.
(5) U-lag is healed up, medicine core component is wrapped up wherein, by wire drawing die, by road drawing, tube reducing.As required, select different wire-drawing dies, can the medicine core cored solder wire of rolling different-diameter.The medicine core cored solder wire diameter of rolling reaches scope 0.8 ~ 3.0mm, obtains final products.
From its cross section, magnesium alloy medicine core cored solder wire is bridging arrangement.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention adds a small amount of activator in the soldering of medicine core, effectively can remove the oxide-film of Mg alloy surface, be conducive to the carrying out of brazing process.Can use on a small quantity according to actual conditions or not use brazing flux in brazing process.
2, medicine core cored solder wire of the present invention is silk material, and diameter range is adjustable, arbitrarily can intercept, be applicable to the connection of complex-shaped soldered fitting according to actual braze.
3, the present invention is without the need to carrying out metallurgical smelting, overcomes some problems that conventional metallurgical melting exists, as too high in the scaling loss of alloying element in solder fusion process, fused solution metal temperature, is detrimental to health.
4, after the present invention adopts gas brazing and TIG to melt soldering, soldered fitting has higher shear strength.
Detailed description of the invention:
" the FCWM50 passive drawing type flux-cored wire machine " that adopt Kunming Heavy Machinery Factory to produce manufactures magnesium alloy flux cored colder wire.The chemical analysis of magnesium ribbon is as shown in table 1.First magnesium ribbon is rolled into U-shaped, then in U-lag, add the metal powder configured, then U-lag is healed up, medicinal powder is wrapped up wherein, after drawing, tube reducing, obtains the medicine core cored solder wire of required diameter.
Embodiment 1:
Select the magnesium ribbon of 8 × 03 (width is 8mm, and thickness is 0.3mm), filling rate is 50%, obtains the medicine core cored solder wire that diameter is 0.8mm after drawing, tube reducing.In powder, the mass percent of each composition is: 56%Zn powder, 7%Al powder, 7%Na
3alF
6, 30%KClMgCl
26H
2o.
Embodiment 2:
Select the magnesium ribbon of 8 × 0.4 (width is 8mm, and thickness is 0.4mm), filling rate is 52%, obtains the medicine core cored solder wire that diameter is 1.0mm after drawing, tube reducing.In powder, the mass percent of each composition is: 52%Zn powder, 6%Al powder, 6%Na
3alF
6, 36%KClMgCl
26H
2o.
Embodiment 3:
Select the magnesium ribbon of 12 × 0.4 (width is 12mm, and thickness is 0.4mm), filling rate is 55%, obtains the medicine core cored solder wire that diameter is 1.6mm after drawing, tube reducing.In powder, the mass percent of each composition is: 50%Zn powder, 5%Al powder, 7%Na
3alF
6, 38%KClMgCl
26H
2o.
Embodiment 4:
Select the magnesium ribbon of 12 × 0.5 (width is 12mm, and thickness is 0.4mm), filling rate is 56%, obtains the medicine core cored solder wire that diameter is 2.0mm after drawing, tube reducing.In powder, the mass percent of each composition is: 40%Zn powder, 4%Al powder, 7%Na
3alF
6, 48%KClMgCl
26H
2o, 1%Mg powder.
Embodiment 5:
Select the magnesium ribbon of 16 × 0.4 (width is 16mm, and thickness is 0.4mm), filling rate is 58%, obtains the medicine core cored solder wire that diameter is 2.4mm after drawing, tube reducing.In powder, the mass percent of each composition is: 36%Zn powder, 4%Al powder, 6%Na
3alF
6, 49%KClMgCl
26H
2o, 5%Mg powder.
Embodiment 6:
Select the magnesium ribbon of 16 × 0.5 (width is 16mm, and thickness is 0.5mm), filling rate is 60%, obtains the medicine core cored solder wire that diameter is 3.0mm after drawing, tube reducing.In powder, the mass percent of each composition is: 30%Zn powder, 2.5%Al powder, 7%Na
3alF
6, 50%KClMgCl
26H
2o, 10.5%Mg powder.
The mode of gas brazing is adopted to carry out soldering to the magnesium alloy medicine core cored solder wire that each embodiment makes.Mother metal is AZ31B magnesium alloy.Mother metal AZ31B piles topical application of drug core cored solder wire, and soldered fitting is lap joint, and after soldering, carry out shear strength test to soldered fitting, its result is as shown in table 2.
The chemical analysis of table 1 magnesium ribbon
| The trade mark | Al | Zn | Mn | Fe | Ni | Cu | Si | Mg |
| Mg | <0.010 | <0.010 | <0.030 | <0.002 | <0.001 | <0.001 | <0.010 | >99.95 |
Table 2 soldered fitting shear strength
Claims (4)
1. a magnesium alloy medication core cored solder wire, is characterized in that, adopts magnesium ribbon as clad, and by medicine core component parcel wherein, the width of magnesium ribbon is 8-16mm, and thickness is 0.3-0.5mm; In medicine core, the mass percent of each component is: the mass percent of Zn powder is the mass percent of 30-56%, Al powder is 2.5-7%, Na
3alF
6mass percent be 5-7%, KClMgCl
26H
2the mass percent of O is 30-50%, and magnesium powder is 0 or surplus; The filling rate of powder is 50%-60%.
2., according to a kind of magnesium alloy medication core cored solder wire of claim 1, it is characterized in that, the diameter of medicine core cored solder wire is 0.8-3.0mm.
3. prepare the method for a kind of magnesium alloy medication core cored solder wire according to claim 1, it is characterized in that, comprise the following steps:
(1) in proportion by Zn powder, Al powder, Na
3alF
6, KClMgCl
26H
2o and magnesium powder mix, and adopt meal mixer mixing;
(2) after powder mixes, bake out temperature is 120 DEG C, dries 2 hours;
(3) powder after oven dry is positioned in flux-cored wire former;
(4) magnesium ribbon is rolled into U-shaped, then in U-lag, add the powder mixed accounting for medicine core cored solder wire gross weight 50% ~ 60%;
(5) U-lag is healed up, medicine core component is wrapped up wherein, by wire drawing die, by road drawing, tube reducing.
4. a kind of magnesium alloy medication core cored solder wire of claim 1 melts solder in soldering and stove for flame solder, TIG.
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|---|---|---|---|
| CN201310215740.2A CN103273211B (en) | 2013-06-01 | 2013-06-01 | Magnesium alloy flux-cored brazing wire and preparation method thereof |
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| CN103273211B true CN103273211B (en) | 2015-06-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105108378B (en) * | 2015-09-08 | 2017-05-17 | 郑州机械研究所 | Flux-cored welding bar for preventing soldering flux from loss |
| CN105643145B (en) * | 2016-03-25 | 2018-02-23 | 江苏科技大学 | A kind of brazing flux for magnesium alloy brazing |
| CN107283085A (en) * | 2017-06-23 | 2017-10-24 | 洛阳理工学院 | A kind of magnesium alloy brazing filler metal containing Sm and preparation method thereof, application |
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| CN101323060A (en) * | 2008-07-11 | 2008-12-17 | 北京工业大学 | Magnesium alloy middle temperature brazing material |
| CN101653879A (en) * | 2009-09-11 | 2010-02-24 | 北京工业大学 | Zn-Mg-Al magnesium alloy solder |
| CN102554503A (en) * | 2011-12-22 | 2012-07-11 | 中国船舶重工集团公司第七二五研究所 | Abrasion-resisting surfacing flux-cored wire for coal milling roller |
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2013
- 2013-06-01 CN CN201310215740.2A patent/CN103273211B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB761277A (en) * | 1953-08-19 | 1956-11-14 | Solar Aircraft Co | Welding fluxes |
| SU1556853A1 (en) * | 1988-06-23 | 1990-04-15 | Ташкентский Политехнический Институт Им.А.Р.Бируни | Flux for welding magnesium alloys |
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