WO2014030416A1 - アルミニウム合金部材の面ろう付け方法 - Google Patents

アルミニウム合金部材の面ろう付け方法 Download PDF

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Publication number
WO2014030416A1
WO2014030416A1 PCT/JP2013/066840 JP2013066840W WO2014030416A1 WO 2014030416 A1 WO2014030416 A1 WO 2014030416A1 JP 2013066840 W JP2013066840 W JP 2013066840W WO 2014030416 A1 WO2014030416 A1 WO 2014030416A1
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Prior art keywords
brazing
aluminum alloy
flux
brazed
mass
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PCT/JP2013/066840
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English (en)
French (fr)
Japanese (ja)
Inventor
貴訓 小久保
堀　久司
亮介 富樫
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日本軽金属株式会社
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Priority to CN201380008942.8A priority Critical patent/CN104114311B/zh
Priority to KR1020147021850A priority patent/KR101570949B1/ko
Publication of WO2014030416A1 publication Critical patent/WO2014030416A1/ja

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    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0233—Sheets, foils
    • B23K35/0238—Sheets, foils layered
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0233—Sheets, foils
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • B23K35/286—Al as the principal constituent
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/362—Selection of compositions of fluxes
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent

Definitions

  • the present invention relates to a surface brazing method for aluminum alloy members capable of forming a sound fillet when the aluminum alloy members are brazed to each other in an inert gas atmosphere using a single layer brazing sheet. It is.
  • the conventional brazing techniques have been based on line contact so that a fillet shape is obtained.
  • a brazing method for example, when the lower plate is a brazing sheet and a plate-like fin is joined vertically thereto, the molten brazing material flows on the brazing sheet to form a fillet.
  • brazing is generally performed using a flux in the air or in an inert gas atmosphere in order to suppress oxidation during brazing heating. ing.
  • Patent Document 1 a member that is brazed using a non-corrosive flux and metal powder, Fe: 0.7-2.5 wt%, Mn: 0.5-2.0 wt%, 2 types are included, Mg: 0.2 wt% or less, and the number of second phase particles having a maximum diameter exceeding 5 ⁇ m at a depth of 20 ⁇ m from the surface to which the non-corrosive flux and the metal powder are applied is 200 particles / mm.
  • a brazing aluminum material characterized by being 2 or less has been proposed. According to this, according to the brazing method that does not use a clad material, it is possible to form an excellent fillet with good brazing fluidity, and to provide an aluminum material for brazing that is excellent in strength.
  • Patent Document 2 discloses a powdered aluminum alloy braze containing Cu: 23 to 37% by mass, Si: 4 to 10% by mass, the balance being Al and inevitable impurities, and an average particle size of 10 to 100 ⁇ m.
  • An aluminum alloy brazing material slurry in which a material and a fluoride-based flux containing 11% by mass or more of CsF as a solid content are suspended in a dispersion medium is brazed into an aluminum alloy casting to be brazed or the other brazed member
  • a method of brazing an aluminum alloy casting characterized in that after being applied to the surface of the brazed part, the other brazed member is assembled to the brazed part to which the aluminum alloy brazing material slurry has been applied and the assembly is heated. ing.
  • a low-temperature brazing method for an aluminum alloy casting is provided in which a brazing material having high wettability and corrosion resistance is used, and a sound joint can be obtained even by brazing in a furnace.
  • the method proposed in Patent Document 4 includes Si: 3 to 12% by mass, Mg: 0.1 to 5.0% by mass between aluminum alloy members having a solidus temperature of 570 ° C. or higher, A brazing temperature of 570 in an inert gas atmosphere with a single-layer brazing sheet made of a brazing material having a thickness of 15 to 200 ⁇ m sandwiched between and having a component composition consisting of Al and inevitable impurities as the balance. It is intended to braze aluminum alloy members without flux while applying a surface pressure of 0.6 gf / mm 2 or more while maintaining the temperature at or above.
  • the present invention has been devised to solve such a problem, and two aluminum alloy members are brazed to each other with a single layer brazing sheet, and a healthy fillet is further formed on the periphery of the brazed surface.
  • the object is to provide a surface brazing method that can be formed.
  • the surface brazing method for an aluminum alloy member of the present invention has a solidus temperature of 610 ° C. or higher using a single layer brazing sheet made of a brazing material of an Al—Si—Mg alloy.
  • a flux is applied to a region separated from the peripheral edge of the brazing surface, and the single-layer brazing sheet is sandwiched between aluminum alloy members and brought into contact with the surface, and a predetermined brazing is performed in an inert gas atmosphere.
  • the aluminum alloy members are brazed together while applying a surface pressure while maintaining the brazing temperature.
  • two aluminum alloy members are subjected to surface brazing by applying a surface pressure between the two aluminum alloy members using a single layer brazing sheet, and the brazing surface A healthy fillet can be formed on the periphery of the.
  • a single layer brazing sheet is used instead of a brazing sheet made of a clad material of two layers or three or more layers, the cost can be reduced as a whole.
  • the brazing surface between the single-layer brazing sheet and the aluminum alloy member is brazed by applying a surface pressure between the two aluminum alloy members without applying flux, it occurs between the two aluminum alloy members. As a result, surface brazing with stable quality can be performed.
  • the flux is applied to the surface of one aluminum alloy member having a large area in plan view and separated from the periphery of the brazing surface, a healthy fillet is formed on the periphery of the brazing surface. Can do.
  • the flux is applied to the surface of the brazing material and the brazing surface of the aluminum alloy member, and the brazing material is inserted between the surfaces of the aluminum alloy member to be joined for brazing heating.
  • the flux can be easily contained.
  • the quality of brazed products tends to vary.
  • the conventional flux-free surface brazing method since a clad material of two layers or three or more layers is used as a brazing sheet, the cost is high.
  • the molten brazing material flows out between the aluminum alloy members, and it is difficult to form a healthy fillet at the periphery of the brazed surface. there were.
  • the present inventors have achieved a stable fillet at the periphery of the brazing surface, without the need to apply flux to the surface of the brazing material and the brazing surface of the aluminum alloy member, at a lower cost than in the prior art.
  • the present invention has been reached in the process of earnestly studying the surface brazing method capable of forming the film. Details will be described below.
  • a single-layer brazing sheet is sufficiently formed in a state in which a single-layer brazing sheet made of a brazing material is sandwiched between two aluminum alloy members and the surface is in contact with each other without applying flux on the brazing surface. It melt
  • one aluminum alloy member may be an aluminum alloy plate, or both may be aluminum alloy plates.
  • an engaging portion may be provided so that parts made of aluminum alloy can be connected to each other, and a portion where the single-layer brazing sheet is sandwiched may be provided in the engaging portion.
  • the material to be joined is not limited to the aluminum alloy plate, and any material may be used as long as it is made of an aluminum alloy having a smooth surface that can be brazed at least partially.
  • an aluminum alloy member which is a to-be-joined material what consists of an aluminum alloy whose solidus temperature is 610 degreeC or more is preferable. Specifically, AA1000 type is preferable.
  • the solidus temperature of the aluminum alloy member to be joined is less than 610 ° C., a part of the aluminum alloy member is melted during brazing heating, and the applied aluminum alloy The member itself may be deformed.
  • a more preferable solidus temperature of the aluminum alloy member is 615 ° C. or higher.
  • a more preferable solidus temperature of the aluminum alloy member is 620 ° C. or higher.
  • the first feature of the present invention is that a brazing sheet comprising a single layer of brazing material having a predetermined composition and thickness is used to reduce costs. Therefore, first, a brazing material and a brazing sheet using the same as a thin plate will be described.
  • the brazing material an alloy containing Si: 3.0 to 12% by mass, Mg: 0.1 to 0.35% by mass, and the balance being composed of Al and inevitable impurities is used.
  • Si 3.0 to 12% by mass Si is an element for lowering the liquidus temperature of the single-layer brazing sheet depending on its content and improving wettability during surface brazing. If the amount of Si contained in the brazing material is less than 3.0% by mass, the temperature of the liquidus of the single-layer brazing sheet becomes too high, and even if a predetermined brazing temperature is reached, the single-layer brazing sheet There is a possibility that dissolution is insufficient and sufficient brazing strength cannot be obtained. When the amount of Si contained in the brazing material exceeds 12% by mass, there is a high possibility that primary Si precipitates (crystallizes) in the center of the ingot during casting, and a healthy hot-rolled sheet was obtained.
  • the Si content of the brazing filler metal is in the range of 3.0 to 12% by mass.
  • a more preferable Si content is in the range of 4.0 to 12% by mass.
  • a more preferable Si content is in the range of 5.0 to 12% by mass.
  • Mg 0.1 to 0.35% by mass Since Mg acts as a reducing agent when oxidized itself, Mg suppresses the oxidation of aluminum at the interface between the aluminum alloy plate and the brazing material of the single-layer brazing sheet by brazing heating, and wets during surface brazing. It is considered to be an element for improving the properties. If the amount of Mg contained in the brazing material is less than 0.1% by mass, although depending on the brazing temperature and the like, the effect is insufficient and sufficient brazing strength may not be obtained.
  • the Mg content of the brazing filler metal is in the range of 0.1 to 0.35% by mass.
  • a more preferable Mg content is in the range of 0.1 to 0.32% by mass.
  • a more preferable Mg content is in the range of 0.1 to 0.3% by mass.
  • Inevitable impurities include Fe, Cu, Mn, Zn, and the like.
  • Fe less than 1.0% by mass
  • Cu less than 1.0% by mass
  • Mn less than 1.0% by mass
  • the content of the components as inevitable impurities is preferably less than 1.0% by mass.
  • impurity elements include Cr, Ni, Zr, Ti, V, B, Sr, Sb, Ca, Na, etc., but Cr: less than 0.5 mass%, Ni: less than 0.5 mass% , Zr: less than 0.2% by mass, Ti: less than 0.2% by mass, V: less than 0.1% by mass, B: less than 0.05% by mass, Sr: less than 0.05% by mass, Sb: 0.0% by mass. If it is in the range of less than 05% by mass, Ca: less than 0.05% by mass, and Na: less than 0.01% by mass, the performance characteristics of the single-layer brazing sheet according to the present invention will not be significantly hindered. It may be contained as an impurity. About Pb, Bi, Sn, and In, each is less than 0.02 mass%, and each other is less than 0.02 mass%. Even if it contains an element outside the control in this range, the effect of the present invention is not hindered. .
  • the brazing material is made into a thin plate and used as a single-layer brazing sheet.
  • the thickness should just be the thickness which can achieve sound surface brazing. If the thickness is less than 15 ⁇ m, sufficient brazing strength may not be obtained. When the thickness exceeds 200 ⁇ m, the amount of the brazing material that oozes out from the joint surface becomes too large, resulting in an increase in cost. Therefore, the thickness range of the single-layer brazing sheet made of the brazing material is 15 to 200 ⁇ m. A more preferable thickness range is 15 to 150 ⁇ m. A more preferable thickness range is 20 to 100 ⁇ m.
  • a single layer brazing sheet made of brazing material having a thickness of 100 ⁇ m is manufactured as follows. Ingots, scraps, and the like as raw materials are blended and put into a melting furnace to melt a molten aluminum having a predetermined brazing material composition.
  • the melting furnace is generally a burner furnace in which the raw material is heated and melted directly by a burner flame. After the molten aluminum reaches a predetermined temperature, for example, 800 ° C., an appropriate amount of the flux for removing the debris is added, and the molten metal is stirred with a stirring rod to dissolve all raw materials.
  • an additional raw material such as Mg
  • an additional raw material such as Mg
  • the metal soot floating on the surface is removed.
  • the molten aluminum is cooled to a predetermined temperature, for example, 740 ° C.
  • the molten aluminum is poured out from the hot water outlet into a bowl, and if necessary, casting is started through an inline rotary degasser, a CFF filter, and the like.
  • a melting furnace and a holding furnace are provided side by side, after the molten metal melted in the melting furnace is transferred to the holding furnace, casting is started after further sedation or the like in the holding furnace.
  • the jacket of the DC casting machine may be a single pour, but may be a multi-pour that places importance on production efficiency. For example, while pouring through a dip tube and a float into a water-cooled mold having a size of 700 mm ⁇ 450 mm, the lower mold is lowered at a casting speed of 60 mm / min, and direct water cooling (Direct Chill), the molten metal in the sump is solidified and cooled to obtain a slab having a predetermined size, for example, 700 mm ⁇ 450 mm ⁇ 4500 mm. After the end of casting, the front and rear ends of the slab were cut and double-sided with 25 mm on one side.
  • Direct Chill direct water cooling
  • the 400 mm thick slab was inserted into a soaking furnace and homogenized at 450 to 540 ° C. for 1 to 12 hours ( HO treatment). After the homogenization treatment, the slab is taken out of the soaking furnace and subjected to several passes of hot rolling with a hot rolling mill to obtain, for example, a 6 mm thick hot rolled plate coil (Reroll).
  • the 6 mm thick hot rolled plate coil is subjected to several passes of cold rolling to obtain a single layer brazing sheet made of a brazing material having a predetermined thickness, for example, 100 ⁇ m.
  • a coil is inserted into the annealer as necessary, and an intermediate annealing process at a holding temperature of 300 to 450 ° C. is performed to perform cold rolling. It is desirable to soften the plate.
  • the second feature of the present invention is the surface of one of the aluminum alloy members having a large area in plan view without applying a flux to the brazing surface of the single-layer brazing sheet and the aluminum alloy member, It is in the point which applies a flux to the area
  • the brazing surface in this specification is the surface which is in contact with the other aluminum alloy member among the surfaces of the single-layer brazing sheet in an assembled state before brazing heating, or one aluminum alloy member. Means the surface overlapping with the other aluminum alloy member in plan view.
  • the flux when flux is applied to the brazing surface of a single-layer brazing sheet and an aluminum alloy member, void defects are likely to occur on the brazing surface as described above, and the flux may be contained. There is. Specifically, when the flux is directly applied to the contact surface between the other aluminum alloy member and the brazing material, or the surface of one aluminum alloy member that overlaps the other aluminum alloy member in plan view. The flux melted during the brazing heating is taken into the brazing surface, and the possibility that defects due to the flux occur on the brazing surface increases.
  • the flux is not applied to the brazing surface, but the flux is applied to the surface of one of the aluminum alloy members having a large area in a plan view and separated from the periphery of the brazing surface. Decided to do. A surface of one aluminum alloy member having a large area in plan view, and applying a flux to a region separated from the periphery of the brazing surface, If flux is applied to such a region, the applied flux melts during brazing heating, diffuses the surface of one aluminum alloy member having a large area in plan view, and the other aluminum alloy member To the periphery (the periphery of the brazing surface).
  • the molten flux that has reached the periphery of the brazing surface stays at the periphery as it is, and improves the wettability between the molten brazing material and the aluminum alloy member without penetrating the brazing surface.
  • a healthy fillet is formed on the periphery of the affixing surface.
  • the flux may be applied as long as it is a surface not in contact with the single-layer brazing sheet among the surfaces of one of the aluminum alloy members having a large area in plan view in the assembled state before brazing heating. Moreover, even if it is a surface which is in contact with the single-layer brazing sheet among the surfaces of one aluminum alloy member having a large area in plan view, it is a surface that does not overlap with other aluminum alloy members in plan view.
  • the flux may be applied because it deviates from the definition of the brazing surface. Even in such a case, since the predetermined surface pressure is applied to the brazed surface after assembly, the flux does not penetrate into the brazed surfaces of the single-layer brazing sheet and the aluminum alloy member. There is a low possibility that the flux will be contained inside the brazing surface during brazing heating.
  • the surface of the single layer brazing sheet is from the edge of the aluminum alloy member with the smaller area in plan view.
  • the surface of the single-layer brazing sheet protruding from the edge of the aluminum alloy member having the smaller area is not a brazed surface, and therefore flux may be applied on this surface.
  • a predetermined surface pressure is applied to the brazing surface, so that the flux does not penetrate into the brazing surfaces of the aluminum alloy members, and brazing. It is unlikely that the flux will be contained inside the brazing surface during heating. Further, the melted flux tends to stay at the edge of the brazing surface, and improves the wettability of the molten brazing material with the aluminum alloy member without degrading the quality of the brazing surface, thereby forming a healthy fillet.
  • the brazing surface is preferably a flat surface, but is not necessarily a flat surface.
  • a cylindrical concave surface is formed on one aluminum alloy member having a large area in plan view
  • a cylindrical convex surface is formed on the other aluminum alloy member having a small area in plan view.
  • the convex surface can be fitted together, and surface brazing may be performed by sandwiching a single-layer brazing sheet that has been bent into the fitting surface.
  • region which applies a flux needs to be slightly spaced apart from the edge of one brazing surface, and is the surface of one aluminum alloy member with a large area by planar view.
  • the flux application position (the shortest distance from the periphery of the brazing surface to the flux application area) exceeds 35 mm, the molten flux is not sufficiently supplied to the periphery of the brazing surface, depending on the brazing conditions and the amount of flux applied. There is a high probability that a healthy fillet will not be formed.
  • the preferred flux application position is in the range of 0.5 to 35 mm.
  • a more preferable flux application position is in the range of 0.5 to 30 mm.
  • a more preferable flux application position is in the range of 1.0 to 30 mm.
  • a preferable flux application amount is in the range of 2 to 40 g / m 2 . If the amount of flux applied is less than 2 g / m 2 , depending on the flux application position, the supply of flux to the peripheral edge of the brazing surface is insufficient, so that a healthy fillet cannot be formed. Even if the amount of flux applied exceeds 40 g / m 2 , the effect of forming a healthy fillet cannot be expected to increase any more, but rather the amount of flux used increases and the production cost increases.
  • a more preferable flux application amount is in the range of 2 to 35 g / m 2 .
  • the application of the flux may be performed by roll-printing a slurry mixed with a solvent, a flux, a binder, and the like from the surface of one aluminum alloy member that has been sealed only in a predetermined region in advance. You may carry out by air-spraying the liquid mixture diluted with the solvent. Alternatively, an appropriate amount of slurry mixed with a solvent, flux, binder, or the like may be applied around the other aluminum alloy member without applying a seal to the aluminum alloy member in advance.
  • the flux include fluoride-based non-corrosive flux, and typical compound forms include KAlF 4 , K 2 AlF 5 , K 3 AlF 6 , AlF 3 , KF, and CsF. It is more preferable to use these fluxes in combination than to use them alone because they approach the eutectic composition and lower the melting point. As described above, the preferable flux application amount is in the range of 2 to 40 g / m 2 .
  • the inert gas nitrogen gas, argon gas, helium gas, or the like can be used.
  • the oxygen concentration in the inert gas is preferably 500 ppm or less. If the oxygen concentration in the inert gas exceeds 500 ppm, the joint strength (shear stress) after surface brazing decreases. A more preferable oxygen concentration in the inert gas is 100 ppm. A more preferable oxygen concentration in the inert gas is 10 ppm or less. Specifically, for the industrial nitrogen gas, since the standard is defined as an oxygen concentration of 10 ppm or less, it is most preferable to use the industrial nitrogen gas from the viewpoint of cost.
  • the inert gas may be injected to replace the atmosphere in the heating device with the inert gas before reaching a predetermined holding temperature.
  • a single layer brazing sheet made of a brazing material of an Al—Si—Mg based alloy having a predetermined composition is melted to bring the brazing material and the aluminum alloy member into a surface.
  • Brazing heating is performed in the state of contact, and at this time, it is necessary to maintain a predetermined brazing temperature while applying a surface pressure of 1.0 gf / mm 2 or more (0.01 MPa or more) to the joint surface.
  • a surface pressure of 1.0 gf / mm 2 or more 0.01 MPa or more
  • the surface pressure applied to the joint surface is high. Therefore, a more preferable surface pressure is 5.0 gf / mm 2 or more (0.05 MPa or more). A more preferable surface pressure is 10 gf / mm 2 or more (0.1 MPa or more).
  • a single-layer brazing sheet (brazing material) having a predetermined composition is dissolved to wet the interface between the aluminum alloy members, thereby reliably brazing.
  • the brazing temperature is at least 580 ° C. or higher.
  • the brazing temperature is less than 580 ° C.
  • the brazing material is not sufficiently dissolved, and sufficient brazing strength cannot be obtained.
  • a more preferable holding temperature is 585 ° C. or higher.
  • a more preferable holding temperature is 590 ° C. or higher.
  • the holding time at the brazing temperature is preferably 2 minutes or more. Although depending on the brazing temperature, if the holding time is less than 2 minutes, sufficient brazing strength cannot be obtained due to uneven temperature at the joint surface. A more preferable holding time is 5 minutes or more.
  • the ingot was chamfered by 3 mm after cutting the hot water to a thickness of 9 mm.
  • the ingot is charged into an electric heating furnace, heated to 480 ° C. at a heating rate of 100 ° C./hr, homogenized at 480 ° C. for 1 hour, and then 3 mm thick by a hot rolling mill. Hot rolling was applied. Thereafter, the hot-rolled plate was cold-rolled to obtain a cold-rolled plate having a thickness of 1.2 mm, and subjected to a primary intermediate annealing at 390 ° C. ⁇ 2 hours for softening.
  • a seal (27 mm ⁇ 27 mm) was attached to the center of a 40 mm ⁇ 40 mm surface of a block A (40 mm ⁇ 40 mm ⁇ 4 mm) made of AA1050 alloy, and the mass was measured. Furthermore, a predetermined amount was applied onto a 40 mm ⁇ 40 mm surface by spraying a mixed solution of fluoride flux and water, and the mass was measured after drying at 200 ° C. The mass difference after fluxing before / coating is divided by application area (1.6 ⁇ 10 3 mm 2) , it was calculated flux application amount (g / m 2).
  • the seal is peeled off, and a single-layer brazing sheet (25 mm ⁇ 25 mm ⁇ 60 ⁇ m) is placed on the center of the surface where the flux is not applied (27 mm ⁇ 27 mm), and further the single-layer brazing sheet (25 mm ⁇ 25 mm).
  • a surface of 25 mm ⁇ 25 mm in AA1050 alloy block B (25 mm ⁇ 25 mm ⁇ 3 mm) was overlapped on the center of the surface.
  • a disc spring was set on the upper surface of the block B, a pressure of 1.5 MPa was applied, and the assembled block or the like was inserted into the test furnace.
  • a thermocouple attached to block A While measuring the actual temperature with a thermocouple attached to block A, heating to 600 ° C. at a rate of 50 ° C./min by PID control, holding at a brazing temperature of 600 ° C. for 5 minutes, and then outputting to the resistance wire
  • the assembled block and the like were furnace-cooled with OFF. After the thermocouple attached to the block A showed 500 ° C. or lower, the assembled block and the like were taken out of the furnace and cooled to room temperature.
  • the atmosphere during heating was adjusted using industrial nitrogen gas (nitrogen having an oxygen concentration of 10 ppm or less).
  • the fillet formation rate is a value obtained by dividing the number of locations where healthy fillets are formed in the block AB after brazing by 6 of all the observed locations. Whether or not a healthy fillet was formed was determined by measuring the “throat thickness” of the fillet portion as shown in FIG. Where a fillet with a throat thickness of 150 ⁇ m or more was observed, it was determined that a healthy fillet was formed.
  • FIGS. 5 and 6 show examples of a cross-sectional metallographic structure of a fillet having a “throat thickness” of 150 ⁇ m or more, and a cross-sectional metallographic structure of a fillet having a “throat thickness” of less than 150 ⁇ m, respectively.
  • the size of the block A is changed (48 mm ⁇ 48 mm ⁇ 4 mm, 68 mm ⁇ 68 mm ⁇ 4 mm, 98 mm ⁇ 98 mm ⁇ 4 mm, 118 mm ⁇ 118 mm ⁇ 4 mm)
  • the flux application position was adjusted by using seals of various sizes (35 ⁇ 35 mm, 55 ⁇ 55 mm, 85 ⁇ 85 mm, 105 ⁇ 105 mm).
  • the fillet formation rate is 6/6 (100%).
  • the fillet formation rate was 2/6 (33%).
  • the preferable Mg content of the brazing material is 0.1 to 0. The range is .35% by mass.
  • the flux application position the shortest distance from the periphery of the block B to the flux application area
  • fillet formation is achieved if the flux application position is 30 mm or less.
  • the rate was 6/6 (100%).
  • the fillet formation rate was 0/6 (0%).
  • the preferred flux application position is in the range of 0.5 to 35 mm.
  • the fillet formation rate is 6/6 (100%). It was. Further, even when the flux application amount is 1 g / m 2 , the fillet formation rate is 5/6 (83%), and the fillet formation rate when the flux is not applied is 1/6 (17%). It is clear that it contributed to the improvement of fillet formation rate. Even if the application amount of the flux exceeds 40 g / m 2 , the effect of forming a healthy fillet cannot be expected to increase any more. Considering that the amount of use of the flux increases and the production cost increases, A preferable flux application amount is in the range of 2 to 40 g / m 2 .
  • a surface brazing method capable of brazing two aluminum alloy members to each other with a single layer brazing sheet and further forming a healthy fillet at the periphery of the brazed surface.

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PCT/JP2013/066840 2012-08-22 2013-06-19 アルミニウム合金部材の面ろう付け方法 WO2014030416A1 (ja)

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CN105880769A (zh) * 2014-11-26 2016-08-24 江苏财发铝业股份有限公司 一种高Mg含量铝合金钎焊材料的制备方法
CN105234572A (zh) * 2015-11-03 2016-01-13 苏州新一磁业有限公司 一种金属logo的制作和组装方法
TWI697372B (zh) * 2019-08-27 2020-07-01 宏進金屬科技股份有限公司 硬銲接合方法

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WO2019151315A1 (ja) * 2018-02-02 2019-08-08 株式会社Uacj ろう付け方法
JPWO2019151315A1 (ja) * 2018-02-02 2021-01-14 株式会社Uacj ろう付け方法
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CN104114311A (zh) 2014-10-22
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JP5906994B2 (ja) 2016-04-20
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