CN115070254A - Composite brazing filler metal for hard alloy brazing and preparation method thereof - Google Patents
Composite brazing filler metal for hard alloy brazing and preparation method thereof Download PDFInfo
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- CN115070254A CN115070254A CN202210798755.5A CN202210798755A CN115070254A CN 115070254 A CN115070254 A CN 115070254A CN 202210798755 A CN202210798755 A CN 202210798755A CN 115070254 A CN115070254 A CN 115070254A
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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
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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
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention relates to the technical field of brazing filler metal, in particular to a composite brazing filler metal for hard alloy brazing and a preparation method thereof. The composite brazing filler metal for brazing the hard alloy comprises at least one stress buffering strip and at least two stress buffering strips which are alternately compounded along the lateral direction, wherein the stress buffering strips are made of the alloy brazing filler metal for brazing and connecting the hard alloy and a matrix, the stress buffering strips are made of metal with a melting point higher than the brazing temperature, and the width of each of the stress buffering strips is larger than that of each of the stress buffering strips. When the composite brazing filler metal for hard alloy brazing is used for brazing, the brazing filler metal strips are melted, brazing connection between hard alloy and a steel substrate is achieved, the stress buffering strips are not melted when brazing due to the fact that the melting point of the stress buffering strips is higher than the brazing temperature, the effect of cutting stress lines is achieved, and the problems that when hard alloy and steel are brazed, joints are large in residual stress, prone to cracking and low in brazing seam strength are effectively solved.
Description
Technical Field
The invention relates to the technical field of brazing filler metal, in particular to a composite brazing filler metal for hard alloy brazing and a preparation method thereof.
Background
The hard alloy cutter is mainly formed by brazing the hard alloy and the steel-based cutter body, has the characteristics of high hardness and good wear resistance, and is widely applied to the fields of rail transit, oil drilling, geological exploration and the like.
Because the thermal expansion coefficients of the hard alloy and the steel matrix are greatly different, the shrinkage of the steel matrix is larger than that of the hard alloy in the cooling process after welding, so that great stress is generated between the brazing filler metal in the brazing seam and the hard alloy and the matrix material on the two sides. The internal stress formed in the brazing seam affects the performance of the hard alloy and the base material, reduces the strength of the brazing seam, leads to the cracking of the brazing seam in severe cases, and shortens the service life of the hard alloy.
The sandwich composite brazing filler metal with a three-layer structure in the vertical direction is commonly used in the prior art, and the thermal stress in a joint is slowly released by utilizing the plastic deformation of a middle-layer compensation gasket. The chinese patent application with publication number CN1136488A discloses a composite material composed of three layers, wherein two outer sides are silver solder alloy, a core layer is copper-based alloy, the three layers are laminated, rolled and compounded, and subjected to diffusion welding heat treatment between composite interfaces, and finally finish rolled to a finished product with a thickness of 0.3 mm. In the existing sandwich composite brazing filler metal, because the brazing filler metal alloy at the brazing seam has higher strength and hardness, and the core layer material generally has better plasticity but lower strength, the hard alloy brazing joint is easy to tear at the whole brazing seam core layer.
Therefore, a new composite brazing filler metal for brazing is needed to solve the above problems in the prior art.
Disclosure of Invention
The invention aims to provide a composite brazing filler metal for hard alloy brazing, which solves the problems that when the existing brazing filler metal is applied to brazing hard alloys and steel, the joint residual stress is large, the joint is easy to crack, and the brazing seam strength is low during working.
The second purpose of the invention is to provide a preparation method of the composite solder for hard alloy brazing, which is simple in process and can realize effective compounding of solder strips and stress buffering strips.
In order to achieve the purpose, the technical scheme of the composite brazing filler metal for hard alloy brazing is as follows:
the composite brazing filler metal for brazing the hard alloy comprises at least one brazing filler metal strip and at least two stress buffering strips which are alternately compounded along the lateral direction, wherein the at least one stress buffering strip is an alloy brazing filler metal for brazing and connecting the hard alloy and a base body, the stress buffering strips are metal with a melting point higher than brazing temperature, and the width of each brazing filler metal strip is larger than that of each stress buffering strip.
When the composite brazing filler metal for hard alloy brazing is used for brazing, the brazing filler metal strips are melted, brazing connection between hard alloy and a steel substrate is achieved, the stress buffering strips are not melted when brazing due to the fact that the melting point of the stress buffering strips is higher than the brazing temperature, the effect of cutting stress lines is achieved, and the problems that when hard alloy and steel are brazed, joints are large in residual stress, prone to cracking and low in brazing seam strength are effectively solved. In addition, compared with the sandwich composite brazing filler metal with the traditional three-layer structure, the composite brazing filler metal with the structure is of a single-layer structure, so that the brazing seam thickness can be effectively reduced, the using amount of the brazing filler metal is saved, and the problem that the whole brazing seam core layer of a brazing joint is torn can be avoided.
Preferably, the melting temperature gradient of the solder strips decreases from both sides to the middle of the composite solder in the lateral direction. Further preferably, the decreasing amplitude of the gradient is 5-100 ℃. When brazing, the brazing filler metal strip positioned in the center is heated slowly, and after the brazing filler metal strip is gradually decreased from two sides of the edge to the middle of the brazing filler metal strip, the whole composite brazing filler metal can be melted at the same time, so that the heating time can be shortened, the brazing efficiency is improved, and meanwhile, the brazing filler metal can be prevented from being oxidized due to overhigh heating temperatures of two sides.
The decreasing of the melting temperature gradient of the solder rods can be achieved in the following manner. Optionally, the braze strips are selected from two or three of BAg40CuZnNi, BAg40CuZnNiMn, BAg28 CuZnNiMn. Optionally, the solder bars are selected from at least two of Cu58ZnMn, Cu54 znmnisi, Cu57ZnMnCo, Cu56 ZnMnCo. Optionally, the solder bars are selected from two or three of CT616, CT716, CT 737.
Preferably, the composite interface between adjacent stress buffering strips and the brazing filler metal strip is a corrugated surface. The corrugated surface can increase the composite area between the corrugated surface and the base plate, improve the composite strength of the corrugated surface and the base plate, and avoid the phenomena of cracking, warping and the like in the processing process.
Preferably, in the lateral direction, both ends of the composite filler metal are solder strips, the solder strips at the ends form outer solder strips, and the width of the outer solder strips is greater than or equal to that of the inner solder strips. The method is favorable for ensuring the welding strength of the edge of the brazing seam and preventing the edge of the brazing seam from cracking.
Preferably, the width of the brazing filler metal strip is 2-50mm, and the width of the stress buffering strip is 1-5 mm. The width of the brazing rod is larger than that of the stress buffering rod, so that the welding area of the brazing rod is larger than the non-welding area cut off by the stress buffering rod, the welding strength of the brazing seam is guaranteed, and the service life is prolonged.
In order to further improve the welding strength of the brazing seam, the width ratio of the stress buffering strips of the brazing filler metal strips is preferably (1-50): 1, and more preferably (5-20): 1.
Preferably, the surface of the composite solder is also coated with a flux. The brazing flux is coated on the surface of the composite brazing filler metal, an oxide film on the surface of the base metal is removed in the brazing process, the base metal and the brazing filler metal are protected, the wettability of the brazing filler metal is improved, meanwhile, the quantitative addition of the brazing flux can be realized, and the waste of the brazing flux is prevented.
Preferably, the stress buffering strip is copper, copper alloy, carbon steel, stainless steel or nickel alloy; the alloy solder is selected from copper-based solder and/or silver-based solder. Optionally, the silver-based solder is an AgCuZnNiMn, AgCuZnNi, AgCuZnSn and/or AgCuZn based solder. Optionally, the copper-based brazing filler metal is a CuZnMn system, a CuZnMnCo system, a cuznmni, a CuZnMnNiSn system, and/or a CuZnMnNiSi system.
In order to reduce the thickness of the brazing seam and save the using amount of brazing filler metal. Preferably, the thickness of the composite brazing filler metal is 0.1-2 mm.
The technical scheme of the preparation method of the composite solder for hard alloy brazing is as follows:
a preparation method of the composite brazing filler metal for hard alloy brazing comprises the following steps:
(1) preparing a stress buffer strip material and a brazing filler metal strip material;
(2) arranging the brazing filler metal strip material and the stress buffering strip material at intervals, and clamping and fixing to form a blank;
(3) performing diffusion compounding on the blank to realize lateral metallurgical compounding between the stress buffering strip material and the brazing filler metal strip material;
(4) and rolling the blank subjected to diffusion compounding to a preset thickness to obtain the composite brazing filler metal.
The preparation method is simple in process, can realize effective compounding of the brazing filler metal strips and the stress buffering strips, and is convenient to apply in industry.
Preferably, the diffusion bonding is vacuum diffusion bonding or hot isostatic pressure diffusion bonding. When the hot isostatic pressing diffusion compounding is adopted, the blank is pressed in a balanced way, the interface bonding strength is high, the uniformity is good, the cracking from the interface bonding part is not easy to happen in the subsequent processing process, and meanwhile, the energy consumption is low and the production efficiency is high.
Preferably, the rolling in the step (4) is differential temperature rolling, and the rolling temperature of the stress buffering strip region is higher than that of the brazing filler metal strip region during the differential temperature rolling. By adopting differential temperature rolling, the rolling temperature of the stress buffering strip area is higher than that of the brazing filler metal strip area, so that the problem of deformation and asynchronism in the rolling process can be prevented. If the temperature difference between the solder strips is large, differential rolling can be adopted between the solder strips, so that the rolling temperature of the solder strips on the inner side is lower than that of the solder strips on the outer side.
Further preferably, the differential temperature rolling is performed by applying a pulsating current to the region of the stress buffer strip or by performing an intermittent laser scanning. By applying pulse current or intermittent laser scanning, the temperature of the region of the stress buffering strip can be increased, and the temperature is prevented from being conducted to the region of the brazing filler metal strip, so that the temperature difference between the stress buffering strip and the brazing filler metal strip is realized, and the deformation synchronism of the stress buffering strip and the brazing filler metal strip in the rolling process is ensured.
Further preferably, when the bonding interface between the stress buffer strip and the solder strip is corrugated, the method further comprises, between the step (1) and the step (2), performing corrugation rolling on the stress buffer strip and the solder strip to form a matched corrugation between the stress buffer strip and the side surface of the solder strip. And (3) when the brazing filler metal strips and the stress buffering strips are arranged at intervals in the step (2), the wave crests and the wave troughs, and the wave troughs and the wave crests of the adjacent stress buffering strips and the brazing filler metal strips are buckled with each other.
Drawings
FIG. 1 is a schematic structural diagram of a composite filler metal provided in example 1 of the present invention;
fig. 2 is a schematic structural diagram of a composite filler metal provided in example 2 of the present invention.
1-stress buffer strip; 2-brazing filler metal strips.
Detailed Description
The composite brazing filler metal is high in brazing reliability and aims to solve the problems that joint residual stress is large, cracking is easy to occur and brazing seam strength is low in work when existing brazing filler metals are used for brazing hard alloys and steel. The composite brazing filler metal comprises a plurality of brazing filler metal strips and stress buffering strips which are alternately compounded along the lateral direction, wherein the brazing filler metal strips are brazing filler metal for connecting hard alloy and a steel matrix, the stress buffering strips are metal with a melting point higher than the brazing temperature, and the width of each brazing filler metal strip is larger than that of each stress buffering strip. When brazing, the stress buffering strip is not melted, the effect of cutting stress lines can be achieved, and the problems that when the hard alloy and the steel are brazed, a joint is large in residual stress, prone to cracking and low in brazing seam strength are effectively solved.
In addition, compare with the sandwich composite brazing filler metal of traditional three-layer structure, the composite brazing filler metal of this kind of structure still has following characteristics:
(1) the composite brazing filler metal is of a single-layer structure in the vertical direction, so that the thickness of brazing seams can be effectively reduced, the using amount of the brazing filler metal is saved, and the problem that a brazing joint is torn at the position of a whole brazing seam core layer can be avoided.
(2) After the stress buffering strip and the brazing filler metal strip are laterally compounded, the structure stability is good, the situation of separation or falling can not occur, and the packaging and the transportation are more convenient.
(3) The stress buffering strips arranged at intervals can also play a role in reducing the overflowing of the brazing filler metal.
(4) The specific components of the composite solder can be flexibly designed, for example, stress buffering strips with the same component or solder strips with the same component can be selected, stress buffering strips with different components or solder strips with different components can be selected, so that the flexible regulation and control of the components of the composite solder are realized, and different brazing requirements are met.
The bonding area between the stress buffering strip and the brazing filler metal strip can be increased for corrugations by arranging the bonding interface between the stress buffering strip and the brazing filler metal strip, and the bonding strength between the stress buffering strip and the brazing filler metal strip is improved. The melting temperature of the brazing filler metal strips is gradually decreased from the edge of the composite brazing filler metal to the center, so that the whole composite brazing filler metal can be melted at the same time, the heating time can be shortened, the brazing efficiency is improved, and the phenomenon that the brazing filler metal is oxidized due to overhigh edge heating temperature can be prevented. Two outsides of composite solder are the brazing filler metal strip to the width that is located outside brazing filler metal strip is greater than or equal to the width that is located the middle brazing filler metal strip of composite solder, is favorable to guaranteeing the welding strength at brazing seam edge, prevents brazing seam edge fracture.
The degressive amplitude of the gradient of the melting temperature of the solder strip is degressive set by taking the middle value of the range of the melting temperature of the solder strip as the reference. For example, the melting temperature of BAg40CuZnNi is 670-780 ℃, the middle value of the melting temperature is 725 ℃, the melting temperature of BAg40CuZnNiMn is 660-760 ℃, and the middle value of the melting temperature is 710 ℃. At this time, the magnitude of the gradient decrease was 15 ℃.
When the composite brazing filler metal for hard alloy brazing is prepared, a stress buffering strip material and a brazing filler metal strip material with the thickness of 10-50 mm can be respectively prepared, the stress buffering strip material and the brazing filler metal strip material are clamped and fixed to form a blank according to requirements, lateral metallurgical compounding is achieved through diffusion compounding, and the composite brazing filler metal with the thickness of about 0.3-0.5 mm is prepared through differential temperature rolling.
The lateral metallurgical compounding of the solder strips and the stress buffering strips can be realized by adopting a vacuum diffusion compounding process. The vacuum degree of vacuum diffusion compounding is 0.01-0.05MPa, the temperature is 500-800 ℃, the pressure is 10-30 MPa, and the diffusion time is 2-8 h.
The present invention will be further described with reference to the following embodiments.
First, examples of the composite brazing filler metal for brazing cemented carbide
Example 1
The composite brazing filler metal for the hard alloy brazing filler metal comprises six brazing filler metal strips and five stress buffering strips, wherein the width of the brazing filler metal strips is 5mm, the width of the stress buffering strips is 1mm, the two outermost brazing filler metal strips are BAg28CuZnNiMn (the melting temperature range is 710-.
In the embodiment, the stress buffering strip is a CuMn2 alloy, and in other embodiments, the mass content of Mn in the CuMn alloy is not more than 8%. The stress buffering strip can also be a CuNi alloy, wherein the mass content of Ni is not more than 10%, and the stress buffering strip can be CuNi 8. The processing difficulty of the stress buffering strip is increased due to the fact that the content of Mn and Ni in the CuMn alloy and the CuNi alloy is too high.
The structure of the composite solder in this embodiment is shown in fig. 1, six solder strips 2 are arranged at intervals along the lateral direction, a stress buffering strip 1 is compounded between two adjacent solder strips 2, and the contact interface between the solder strip 2 and the stress buffering strip 1 is a plane.
Example 2
The composite brazing filler metal for the hard alloy brazing filler metal comprises four brazing filler metal strips and three stress buffering strips, wherein the width of the brazing filler metal strips is 10mm, the width of the stress buffering strips is 2mm, the two brazing filler metal strips positioned on the outer sides are made of Cu58ZnMn (with the melting temperature range of 880 + 910 ℃), and the two brazing filler metal strips positioned in the middle are made of Cu54ZnMnNiSi (with the melting temperature range of 865 + 880 ℃). 08 steel is selected as the stress buffering strip.
The structure of the composite brazing filler metal in the embodiment is shown in fig. 2, three brazing filler metal strips 2 are arranged at intervals along the lateral direction, stress buffering strips 1 are compounded between every two adjacent brazing filler metal strips 2, and the contact interface of the brazing filler metal strips 2 and the stress buffering strips 1 is a corrugated surface.
Example 3
The composite brazing filler metal for the hard alloy brazing filler metal comprises three brazing filler metal strips and two stress buffering strips, wherein the width of the brazing filler metal strips is 40mm, the width of the stress buffering strips is 2mm, the two brazing filler metal strips positioned on the outer side are BAg40CuZnNi (the melting temperature range is 670-. The stress buffer strip is made of CuNi8 alloy.
Example 4
The composite brazing filler metal for the hard alloy brazing filler metal comprises ten brazing filler metal strips and nine stress buffering strips, wherein the width of each brazing filler metal strip is 5mm, the width of each stress buffering strip is 1mm, the four outermost strips are selected from CT616 (the melting temperature range is 790 and 830 ℃), the four next outer strips are selected from CT716 (the melting temperature range is 630 and 790 ℃), and the two middle brazing filler metal strips are selected from CT737 (the melting temperature range is 610 and 690 ℃). The stress buffering strip is made of 08 steel.
Example 5
The composite brazing filler metal for the hard alloy brazing filler metal comprises five brazing filler metal strips and four stress buffering strips, wherein the width of the brazing filler metal strips is 15mm, the width of the stress buffering strips is 2mm, the two brazing filler metal strips positioned on the outer side are Cu57ZnMnCo (with the melting temperature range of 890-910 ℃), the two brazing filler metal strips positioned on the second outer side are Cu56ZnMnCo (with the melting temperature range of 890-920 ℃), and the brazing filler metal strip positioned in the middle is Cu56ZnMn (with the melting temperature range of 880-910 ℃). The stress buffering strip is made of 10 steel.
Second, example of the method for preparing the composite brazing filler metal for brazing cemented carbide
Example 6
The embodiment is a preparation method of the composite brazing filler metal for hard alloy brazing in the embodiment 1, and the preparation method comprises the following specific steps:
(1) a stress buffer bar (CuMn2 alloy) material with a thickness of 20mm and a solder bar material with a thickness of 20mm were prepared respectively.
(2) And arranging the solder strips and the stress buffering strips at intervals, clamping and fixing to form a blank, wherein the lateral pre-tightening force is 3 MPa.
(3) Carrying out vacuum furnace diffusion compounding on the blank so as to realize lateral metallurgical compounding between the stress buffer strip and the brazing filler metal strip; the vacuum degree during diffusion compounding is 0.01MPa, the temperature is 550 ℃, the applied lateral compounding pressure is 20MPa, and the diffusion compounding time is 5 h.
(4) Carrying out intermittent laser scanning on the region of the stress buffering strip to increase the temperature of the region of the stress buffering strip to be higher than that of the unscanned brazing filler metal strip region, carrying out differential temperature rolling on the blank, ensuring the synchronism of deformation of the stress buffering strip and the unscanned brazing filler metal strip in the rolling process, and finally obtaining the composite brazing filler metal with the thickness of 0.3 mm; wherein the power of the intermittent laser scanning is 1.2W, the scanning speed is 5mm/s, the diameter of a light spot is 0.6mm, the scanning heating time is 1s, and the intermittent time is 1 s. In the differential temperature rolling process, the temperature of the stress buffering strip area is 550 ℃, and the temperature of the brazing bar area is 500 ℃.
And in the differential temperature rolling process, the rolling temperature of the stress buffering strip region is equal to the rolling temperature of the brazing strip region plus 50-100 ℃, and the rolling temperature of the stress buffering strip region is more than 50 ℃ less than the melting temperature of the brazing strip with the lowest melting temperature. In this embodiment, the melting temperature range of the solder bar BAg40CuZnNiMn is 660-760 ℃, the rolling temperature of the stress buffering bar region can be set to 550 ℃.
Example 7
The embodiment is a preparation method of the composite brazing filler metal for hard alloy brazing in the embodiment 2, and the preparation method comprises the following specific steps:
(1) stress buffer strip materials with the thickness of 10mm and brazing filler metal strip materials with the thickness of 10mm are respectively prepared.
(2) And (4) performing corrugation rolling on the stress buffering strips and the brazing filler metal strips to enable the side surfaces of the stress buffering strips and the brazing filler metal strips to form matched corrugated surfaces.
(3) And arranging the brazing filler metal strips and the stress buffering strips at intervals to enable the wave crests and the wave troughs of the adjacent stress buffering strips and the brazing filler metal to be opposite, and clamping and fixing the adjacent stress buffering strips and the wave troughs to form a blank, wherein the lateral pre-tightening force is 3 MPa.
(4) Performing vacuum furnace diffusion compounding on the blank by adopting hot isostatic pressing diffusion compounding so as to realize lateral metallurgical compounding between the stress buffering strip and the brazing filler metal strip; the vacuum degree in the diffusion compounding process is 0.01MPa, the temperature is 700 ℃, the lateral compounding pressure is 20MPa, and the diffusion compounding time is 5 h.
(5) And applying pulse current to the region of the stress buffer strip to realize differential temperature rolling of the region of the stress buffer strip and the region of the brazing filler metal strip, and finally obtaining the composite brazing filler metal with the thickness of 0.3 mm. Wherein the pulse frequency of the pulse current is 500Hz, and the pulse current is 200A/mm 2 The duty cycle is 50%. In the differential temperature rolling process, the temperature of the stress buffering strip area is 700 ℃, and the temperature of the solder strip area is 600 ℃.
In the present embodiment, the corrugated shape is a sine curve, and in other embodiments, the corrugated shape may be any one of a sine curve, a cosine curve, a parabola or a trapezoidal tooth.
Example 8
The present example is a method for preparing the composite brazing filler metal for cemented carbide in example 3, and the specific steps refer to the preparation method in example 6, except that: the spot diameter of the intermittent laser scanning was 1.8 mm.
Example 9
This example is a method for producing a composite brazing filler metal for cemented carbide in example 4, and is different from the method of producing the brazing filler metal in example 7 only in that: the temperature in the diffusion compounding process is 500 ℃, and the pulse current in the differential temperature rolling process is 150A/mm 2 The temperature in the stress buffering strip zone was 550 ℃ and the temperature in the solder strip zone was 480 ℃.
Example 10
This example is a method for producing a composite brazing filler metal for cemented carbide in example 5, and is different from the method of producing in example 6 only in that: the temperature in the diffusion compounding process is 700 ℃, the spot diameter of the intermittent laser scanning in the differential temperature rolling process is 1.8mm, the temperature in the stress buffering strip area is 700 ℃, and the temperature in the brazing bar area is 600 ℃.
Third, comparative example and comparative test
Comparative example 1
This comparative example is a comparative experiment to example 6, with the same brazing process parameters and shear test parameters.
A traditional sandwich brazing filler metal (BAg 40CuZnNiMn brazing filler metal is arranged at the upper part and the lower part, and CuMn alloy is arranged at the core layer) is manufactured by using the BAg40CuZnNiMn brazing filler metal and the CuMn alloy, the thickness of each layer is 0.1mm, and the total thickness of the brazing filler metal is 0.3 mm.
The average shear strength of the joint is 221.3MPa when YG13C hard alloy and 42CrMo steel are brazed by using the traditional sandwich brazing filler metal.
After the YG13C cemented carbide and the 42CrMo steel were brazed using the composite solder provided in example 6, the average shear strength of the joint was 232.4 MPa.
Comparative example 2
This comparative example is a comparative experiment of example 7, with the same brazing process parameters and shear test parameters.
The traditional sandwich brazing filler metal is made of Cu58ZnMn brazing filler metal and 08 steel, the thickness of each layer is 0.1mm, and the total thickness of the brazing filler metal is 0.3 mm.
The average shear strength of joints of YG13C hard alloy and 42CrMo steel brazed by using the traditional sandwich brazing filler metal is 190.3 MPa.
After the YG13C cemented carbide and the 42CrMo steel were brazed using the composite brazing filler metal provided in example 7, the average shear strength of the joint was 203.2 MPa.
Comparative example 3
This comparative example is a comparative experiment to example 8, with the same brazing process parameters and shear test parameters.
The BAg40CuZnNiMn brazing filler metal and the CuMn alloy are used for manufacturing the traditional sandwich brazing filler metal, the thickness of each layer is 0.1mm, and the total thickness of the brazing filler metal is 0.3 mm.
The average shear strength of the joint is 215.6MPa when YG13C hard alloy and 42CrMo steel are brazed by using the traditional sandwich brazing filler metal.
After the YG13C cemented carbide and the 42CrMo steel were brazed using the composite solder provided in example 8, the average shear strength of the joint was 225.4 MPa.
Comparative example 4
This comparative example is a comparative experiment to example 9, with the same brazing process parameters and shear test parameters.
The traditional sandwich brazing filler metal is made of CT616 brazing filler metal and 08 steel, the thickness of each layer is 0.1mm, and the total thickness of the brazing filler metal is 0.3 mm.
The average shear strength of the joint is 191.6MPa when the YG13C hard alloy and 42CrMo steel are brazed by using the traditional sandwich brazing filler metal.
After the YG13C cemented carbide and the 42CrMo steel were brazed using the composite solder provided in example 9, the average shear strength of the joint was 204.2 MPa.
Comparative example 5
This comparative example is that of example 10, with the same brazing process parameters and shear test parameters.
The Cu56ZnMnCo brazing filler metal and 08 steel are used for manufacturing the traditional sandwich brazing filler metal, the thickness of each layer is 0.1mm, and the total thickness of the brazing filler metal is 0.3 mm.
The average shear strength of the joint is 194.1MPa when the YG13C hard alloy and 42CrMo steel are brazed by using the traditional sandwich brazing filler metal.
After the YG13C cemented carbide and the 42CrMo steel were brazed using the composite brazing filler metal provided in example 10, the average shear strength of the joint was 203.5 MPa.
Claims (10)
1. The composite brazing filler metal for brazing the hard alloy is characterized by comprising at least one stress buffering strip and at least two stress buffering strips which are alternately compounded along the lateral direction, wherein the alloy brazing filler metal for brazing and connecting the hard alloy and a matrix is used as the brazing filler metal, the stress buffering strips are made of metal with a melting point higher than the brazing temperature, and the width of each brazing filler metal strip is larger than that of each stress buffering strip.
2. The composite filler metal for brazing cemented carbide according to claim 1, wherein a melting temperature gradient of the filler metal strip decreases from both sides to the middle of the composite filler metal in the lateral direction.
3. The composite filler metal for brazing of cemented carbide according to claim 2, wherein the gradient decreases in magnitude from 5 to 100 ℃.
4. The composite filler metal for brazing a cemented carbide according to claim 1, wherein the composite interface between the adjacent stress buffering strands and the filler metal strands is a corrugated surface.
5. The composite filler metal for brazing hard alloys according to claim 1, wherein in the lateral direction, both ends of the composite filler metal are solder strips, and the solder strips at the ends form outer solder strips, and the width of the outer solder strips is greater than or equal to the width of the inner solder strips.
6. The composite filler metal for brazing a cemented carbide according to claim 1, wherein the width of the filler metal strips is 2 to 50mm, and the width of the stress buffering strips is 1 to 5 mm.
7. The composite filler metal for hard alloy brazing according to any one of claims 1 to 6, wherein the stress buffering strip is copper, a copper alloy, carbon steel, stainless steel or a nickel alloy; the alloy solder is selected from copper-based solder and/or silver-based solder.
8. A preparation method of the composite brazing filler metal for hard alloy brazing according to any one of claims 1 to 7, characterized by comprising the following steps:
(1) preparing a stress buffer strip material and a brazing filler metal strip material;
(2) arranging the brazing filler metal strip material and the stress buffering strip material at intervals, and clamping and fixing to form a blank;
(3) performing diffusion compounding on the blank to realize lateral metallurgical compounding between the stress buffering strip material and the brazing filler metal strip material;
(4) and rolling the diffusion compounded blank to a preset thickness to obtain the composite brazing filler metal.
9. The method of producing a composite filler metal for brazing cemented carbide according to claim 8, wherein the diffusion cladding is vacuum diffusion cladding or hot isostatic pressure diffusion cladding.
10. The method for producing a composite filler metal for brazing a cemented carbide according to claim 7 or 8, wherein the rolling in the step (4) is differential temperature rolling in which a rolling temperature in a stress relaxation strip region is higher than that in a filler metal strip region.
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| CN202210798755.5A CN115070254A (en) | 2022-07-06 | 2022-07-06 | Composite brazing filler metal for hard alloy brazing and preparation method thereof |
| JP2023000541U JP3241691U (en) | 2022-07-06 | 2023-02-24 | Composite brazing filler metal for cemented carbide brazing |
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| US20180105899A1 (en) * | 2015-05-20 | 2018-04-19 | Nec Corporation | Solder alloy |
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| CN113634947A (en) * | 2021-08-25 | 2021-11-12 | 郑州机械研究所有限公司 | Composite brazing filler metal for hard alloy brazing and preparation method thereof |
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2022
- 2022-07-06 CN CN202210798755.5A patent/CN115070254A/en active Pending
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| JPS63168290A (en) * | 1986-12-29 | 1988-07-12 | Tokuriki Honten Co Ltd | Composite brazing filler metal and brazing method thereof |
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