CN108188521B - High-frequency induction heating brazing method for molybdenum-rhenium alloy foil - Google Patents
High-frequency induction heating brazing method for molybdenum-rhenium alloy foil Download PDFInfo
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- CN108188521B CN108188521B CN201810075010.XA CN201810075010A CN108188521B CN 108188521 B CN108188521 B CN 108188521B CN 201810075010 A CN201810075010 A CN 201810075010A CN 108188521 B CN108188521 B CN 108188521B
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/002—Soldering by means of induction heating
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
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Abstract
The invention belongs to the field of metal material welding, relates to a method for welding refractory metals, and particularly relates to a high-frequency induction heating brazing method for molybdenum-rhenium alloy foils with the thickness of less than 0.2 mm. The method cuts the molybdenum-rhenium alloy foil and processes a welding area into a downward bending butt joint structure. And filling Ni-Cr-Si-B series or Ni-Mn-Cu-Zr series block solder into a welded area, placing the welded area in the middle position of the upper split induction coil and the lower split induction coil, and carrying out electric welding. The welding process parameters are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 45-75%, the electrifying time is 15-40 s, and the highest temperature of induction heating is controlled at 1050 ℃. During welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butt joint. The invention can realize effective connection of the molybdenum-rhenium alloy foil, obtain the brazed joint which has no air holes, no cracks and beautiful appearance, and has stable quality. The invention has the advantages of simple process, high welding speed, lower cost, convenient popularization and the like.
Description
Technical Field
The invention belongs to the field of metal material welding, relates to a method for welding refractory metals, and particularly relates to a high-frequency induction heating brazing method for molybdenum-rhenium alloy foils with the thickness of less than 0.2 mm.
Background
The molybdenum-rhenium alloy has excellent high-temperature creep resistance, low-temperature toughness, wear resistance, corrosion resistance and other properties, and is widely applied to the fields of chemistry, metallurgy, electronics, aerospace, nuclear industry, national defense, military and the like, such as electronic components, radar antenna components, thermocouples and the like under extremely severe conditions. The molybdenum-rhenium alloy prepared in the prior art has the best comprehensive performance of Mo50-Re50 series alloy, has the tensile strength of over 1000MPa at room temperature, and is usually prepared into a foil or a wire for use. However, the welding or connection problem is inevitable during the use process, but the welding difficulty is high, so the application of the welding or connection problem is greatly limited. Currently, research on molybdenum-rhenium alloy welding technology is less, and the main welding methods comprise electron beam welding, laser welding, resistance spot welding, brazing, friction welding and the like. The welding of the molybdenum-rhenium alloy foil (the thickness is less than 0.2mm) only comprises the processes of brazing, laser welding, resistance electric welding and the like, and the molybdenum-rhenium alloy foil is easy to burn through or break when in high-energy or high-energy beam connection, so that effective connection cannot be realized. In addition, during welding such as resistance spot welding, laser welding, electron beam welding, etc., C, O, N is attracted to the molybdenum-rhenium alloy, which forms brittle compounds and thermal stress, which causes cracks to form, and pores may be formed, which may degrade the performance of the joint. Although brazing processes have been used and achieve better quality joints, their welding productivity is inefficient and joint strength is low, limiting their application.
A high-frequency induction heating brazing method is a high-efficiency connection method with high speed and energy concentration, wherein an annular induction coil is manufactured according to the flow direction of high-frequency current during welding, a strong magnetic beam with the polarity changing instantly is generated in the coil, a heated metal workpiece is placed in the coil, the magnetic beam penetrates through the heated metal workpiece, eddy current is generated in the coil in the direction opposite to the heating current, the surface temperature of the workpiece is rapidly increased under the action of the skin effect, heat is limited in a narrow area of the induction coil, and brazing filler metal is melted to obtain an effective connection joint. When the heating is stopped, because the metal heat conduction speed is high, the brazing seam metal temperature is rapidly reduced, and the effects of ambient air on the surface of the molten brazing filler metal at the brazing seam, such as oxidation, hydrogen absorption, carbon absorption and the like are limited, the brazed joint with higher strength performance can be obtained. The invention provides a novel connection method which is suitable for quick, efficient and low-cost molybdenum-rhenium alloy foils based on the characteristics of high-frequency induction heating brazing and combined with the characteristics of molybdenum-rhenium alloys.
Disclosure of Invention
The invention provides a welding process method which adopts rapidness, energy concentration and low cost to make up the defects of the prior art in the aspect of welding the molybdenum-rhenium alloy foils made of refractory metals, realizes effective connection of the molybdenum-rhenium alloy foils and obtains an excellent molybdenum-rhenium alloy welding joint.
The invention provides a high-frequency induction heating brazing method of a molybdenum-rhenium alloy foil, which is realized by the following steps:
(1) cutting and preprocessing the molybdenum-rhenium alloy foil to be welded into a required size;
(2) cleaning the to-be-welded area of the molybdenum-rhenium alloy foil;
(3) assembling the molybdenum-rhenium alloy foil to be welded on a clamp of a tool system, designing a downward bending butt joint structure, keeping a 1.2-1.6mm distance between butt joint areas of the molybdenum-rhenium alloy foil, and simultaneously ensuring that the position of a welding line is positioned at the center of a base plate of the clamp after welding;
(4) adding a block-shaped brazing filler metal according to the volume of a downward bending area of a molybdenum-rhenium alloy butt joint area to the Ni-Cr-Si-B brazing filler metal or the Ni-Mn-Cu-Zr brazing filler metal obtained by the conventional preparation method;
(5) after the molybdenum-rhenium alloy foil and the brazing filler metal are filled and assembled, placing the molybdenum-rhenium alloy to be welded and the accessory fixture at the middle position of the upper and lower oppositely-opened induction coils, electrifying and heating for welding; the parameters of the high-frequency induction heating brazing process are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 45-75%, the electrifying time is 15-40 s, and the highest temperature of induction heating is controlled at 1050 ℃. During welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butting.
In the step (1), in order to realize effective welding of the molybdenum-rhenium alloy foil, two sides of the butt joint area of the alloy foil are prepared into a downward bending shape (see fig. 1 and 2), the downward bending distance is less than or equal to 3mm, and the oblique angle of the downward bending single side is not more than 45 degrees.
In the step (2), cleaning the to-be-welded area before welding refers to removing oil stains and oxidation films on the surface of the molybdenum-rhenium alloy welding area to make the surface as smooth as possible without any impurities, cleaning and drying, and intensively cleaning the vicinity of a downward bend (see fig. 1 and 3). The cleaning method comprises the following steps: polishing surface areas of two surfaces of a recurved area of the molybdenum-rhenium alloy foil by using 1200# abrasive paper, and polishing a non-welding area with a surrounding edge of 3-6 mm by using 800# abrasive paper to ensure that metal luster is leaked; then, the polished sample is placed in a glass container with acetone, ultrasonic cleaning is carried out for 20min at the temperature of 40 ℃, and then secondary cleaning and blow-drying are carried out by using alcohol.
In the step (3), the molybdenum-rhenium alloy foils are butted, fixed and assembled by adopting the prior art, but the metal of the butted downward bending areas of the two foils is required to be ensured to be right positioned in the middle of the tool and be communicated with the groove up and down (see figure 1), and then the two ends of the butt joint are effectively fixed by adopting a miniature fixing clamp.
In the step (4), the chemical components of the Ni-Cr-Si-B brazing filler metal comprise 17.5-19.5% of Cr, 6.5-8.5% of Si, 0-1.5% of B and the balance of Ni; the chemical components of the Ni-Mn-Cu-Zr solder are 17.0-27.0% of Mn, 4.0-8.0% of Cu, 0-3.0% of Zr and the balance of Ni. The brazing temperature of the Ni-Cr-Si-B brazing filler metal is 1040-1080 ℃, and the brazing temperature of the Ni-Mn-Cu-Zr brazing filler metal is 1020-1060 ℃; and the process does not need to add brazing flux.
In the step (5), in order to obtain the butt joint with the best appearance and ensure the quality of the joint, a ceramic upper push rod structure (see fig. 1 and fig. 2) is assembled at the lower end of an upper and lower communicating groove in the middle of the molybdenum-rhenium alloy foil tool, so that in the high-frequency induction heating stabilization stage, an upper thrust is applied through the ceramic upper push rod, and after the molybdenum-rhenium alloy foil butt-joint downward bending area is combined with the brazing filler metal, the butt joint is straightened under the action of the upper thrust, and the brazed joint with the attractive appearance is obtained.
By adopting the high-frequency induction heating brazing method for the molybdenum-rhenium alloy foil, the effective connection of the molybdenum-rhenium alloy foil can be realized, the brazed joint which is free of air holes, cracks and attractive in appearance is obtained, and the quality of the joint is stable. The high-frequency induction heating brazing method for the molybdenum-rhenium alloy foil has the advantages of simple process, high welding speed, low cost, convenience in popularization and the like, and can meet the requirements on the quality and the use strength of the molybdenum-rhenium alloy foil welding joint.
Drawings
FIG. 1 is a schematic diagram of one embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of the present invention;
FIG. 3 is a third schematic diagram of various embodiments of the present invention.
Description of the symbols in the drawings
1. A first upper pressure plate; 2. an upper pressure plate II; 3. a molybdenum-rhenium alloy foil I; 4. a molybdenum-rhenium alloy foil II; 5. a first lower base plate; 6. a second lower base plate; 7. a ceramic upper push rod; 8. welding the alloy into a butt joint shape; 9. an upper induction coil; 10. and a lower induction coil.
Detailed Description
The invention will now be further illustrated by the following non-limiting examples
Example 1
In the embodiment, Mo50-Re50 alloy foil is used as a workpiece to be welded, the size of the foil is 20mm multiplied by 80mm, and the thickness of the foil is 0.18 mm.
The specific Mo50-Re50 alloy foil high-frequency induction heating brazing process comprises the following steps:
(1) the lower bent direct welding areas 8 and the upper and lower surfaces nearby of the Mo50-Re50 alloy foils 3 and 4 are polished by abrasive paper, the non-welding areas are also polished to enable the surfaces to have metallic luster, and the welded workpieces are cleaned by an ultrasonic cleaner. The specific method comprises the following steps: polishing surface areas of two surfaces of a recurved area of the molybdenum-rhenium alloy foil by using 1200# abrasive paper, and polishing a non-welding area with a surrounding edge of 3-6 mm by using 800# abrasive paper to ensure that metal luster is leaked; then putting the polished sample into a glass container with acetone, performing ultrasonic cleaning for 20min at the temperature of 40 ℃, and performing secondary cleaning and blow-drying by using alcohol;
(2) assembling the molybdenum-rhenium alloy foils to be welded on a clamp of a tool system, fixing the metal foils on two sides through pressing plates 1 and 2, keeping a distance of 1.2-1.6mm between the butt joint areas of the molybdenum-rhenium alloy foils, and simultaneously ensuring that the position of a welding line is positioned at the center of a base plate of the clamp after welding;
(3) adding a block-shaped brazing filler metal into the Ni-Cr-Si-B brazing filler metal obtained by the existing preparation according to the volume of a lower bending area of a molybdenum-rhenium alloy butt joint area; brazing flux does not need to be added in the brazing implementation process;
(4) after the molybdenum-rhenium alloy foil and the brazing filler metal are filled and assembled, placing the alloy to be welded and the accessory fixture at the middle position of the upper and lower oppositely-opened induction coils, electrifying and heating for welding; the parameters of the high-frequency induction heating brazing process are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 45%, the electrifying time is 15s, and the highest temperature of induction heating is controlled at 1050 ℃. During welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butting.
The high-frequency induction heating brazing joint of the molybdenum-rhenium alloy (Mo50-Re50) obtained by the welding process is good in forming, cracks, pores and other microscopic defects are not found through appearance inspection and metallographic microscope observation of a welding seam, the room-temperature tensile strength can reach 745MPa (shown in table 1), and the tensile strength of a base material reaches 71%. Meets the basic use requirement of the connected molybdenum-rhenium alloy.
TABLE 1 high-frequency induction heating test results of Mo-Re alloy soldered joint and base material tensile strength
Example 2
In the embodiment, Mo50-Re50 alloy foil is used as a workpiece to be welded, the size of the foil is 20mm multiplied by 80mm, and the thickness of the foil is 0.18 mm.
The specific Mo50-Re50 alloy foil high-frequency induction heating brazing process comprises the following steps:
(1) the lower bent direct welding areas 8 and the upper and lower surfaces nearby of the Mo50-Re50 alloy foils 3 and 4 are polished by abrasive paper, the non-welding areas are also polished to enable the surfaces to have metallic luster, and the welded workpieces are cleaned by an ultrasonic cleaner. The specific method comprises the following steps: polishing surface areas of two surfaces of a recurved area of the molybdenum-rhenium alloy foil by using 1200# abrasive paper, and polishing a non-welding area with a surrounding edge of 3-6 mm by using 800# abrasive paper to ensure that metal luster is leaked; then putting the polished sample into a glass container with acetone, performing ultrasonic cleaning for 20min at the temperature of 40 ℃, and performing secondary cleaning and blow-drying by using alcohol;
(2) assembling the molybdenum-rhenium alloy foils to be welded on a clamp of a tool system, fixing the metal foils on two sides through pressing plates 1 and 2, keeping a distance of 1.2-1.6mm between the butt joint areas of the molybdenum-rhenium alloy foils, and simultaneously ensuring that the position of a welding line is positioned at the center of a base plate of the clamp after welding;
(3) adding a block-shaped brazing filler metal into the Ni-Cr-Si-B brazing filler metal obtained by the existing preparation according to the volume of a lower bending area of a molybdenum-rhenium alloy butt joint area; brazing flux does not need to be added in the brazing implementation process;
(4) after the molybdenum-rhenium alloy foil and the brazing filler metal are filled and assembled, placing the alloy to be welded and the accessory fixture at the middle position of the upper and lower oppositely-opened induction coils, electrifying and heating for welding; the parameters of the high-frequency induction heating brazing process are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 60%, the electrifying time is 28s, and the highest temperature of induction heating is controlled at 1050 ℃. During welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butting.
The high-frequency induction heating brazing joint of the molybdenum-rhenium alloy (Mo50-Re50) obtained by the welding process is good in forming, cracks, pores and other microscopic defects are not found through appearance inspection and metallographic microscope observation of a welding seam, the room-temperature tensile strength can reach 725MPa (shown in table 2), and the tensile strength of a base material reaches 69%. Meets the basic use requirement of the connected molybdenum-rhenium alloy.
TABLE 2 high-frequency induction heating of Mo-Re alloy for soldered joints and tensile strength test results of parent metal
Example 3
In the embodiment, Mo50-Re50 alloy foil is used as a workpiece to be welded, the size of the foil is 20mm multiplied by 80mm, and the thickness of the foil is 0.18 mm.
The specific Mo50-Re50 alloy foil high-frequency induction heating brazing process comprises the following steps:
(1) the lower bent direct welding areas 8 and the upper and lower surfaces nearby of the Mo50-Re50 alloy foils 3 and 4 are polished by abrasive paper, the non-welding areas are also polished to enable the surfaces to have metallic luster, and the welded workpieces are cleaned by an ultrasonic cleaner. The specific method comprises the following steps: polishing surface areas of two surfaces of a recurved area of the molybdenum-rhenium alloy foil by using 1200# abrasive paper, and polishing a non-welding area with a surrounding edge of 3-6 mm by using 800# abrasive paper to ensure that metal luster is leaked; then putting the polished sample into a glass container with acetone, performing ultrasonic cleaning for 20min at the temperature of 40 ℃, and performing secondary cleaning and blow-drying by using alcohol;
(2) assembling the molybdenum-rhenium alloy foils to be welded on a clamp of a tool system, fixing the metal foils on two sides through pressing plates 1 and 2, keeping a distance of 1.2-1.6mm between the butt joint areas of the molybdenum-rhenium alloy foils, and simultaneously ensuring that the position of a welding line is positioned at the center of a base plate of the clamp after welding;
(3) adding a block-shaped brazing filler metal into the Ni-Cr-Si-B brazing filler metal obtained by the existing preparation according to the volume of a lower bending area of a molybdenum-rhenium alloy butt joint area; brazing flux does not need to be added in the brazing implementation process;
(4) after the molybdenum-rhenium alloy foil and the brazing filler metal are filled and assembled, placing the alloy to be welded and the accessory fixture at the middle position of the upper and lower oppositely-opened induction coils, electrifying and heating for welding; the parameters of the high-frequency induction heating brazing process are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 75%, the electrifying time is 38s, and the highest temperature of induction heating is controlled at 1050 ℃. During welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butting.
The high-frequency induction heating brazing joint of the molybdenum-rhenium alloy (Mo50-Re50) obtained by the welding process is good in forming, cracks, pores and other microscopic defects are not found through appearance inspection and metallographic microscope observation of a welding seam, the room-temperature tensile strength can reach 694MPa (shown in a table 3), and the tensile strength of a base material reaches 66%. Meets the basic use requirement of the connected molybdenum-rhenium alloy.
TABLE 3 high-frequency induction heating test results of Mo-Re alloy soldered joint and base material tensile strength
Example 4
In the embodiment, Mo50-Re50 alloy foil is used as a workpiece to be welded, the size of the foil is 20mm multiplied by 80mm, and the thickness of the foil is 0.18 mm.
The specific Mo50-Re50 alloy foil high-frequency induction heating brazing process comprises the following steps:
(1) the lower bent direct welding areas 8 and the upper and lower surfaces nearby of the Mo50-Re50 alloy foils 3 and 4 are polished by abrasive paper, the non-welding areas are also polished to enable the surfaces to have metallic luster, and the welded workpieces are cleaned by an ultrasonic cleaner. The specific method comprises the following steps: polishing surface areas of two surfaces of a recurved area of the molybdenum-rhenium alloy foil by using 1200# abrasive paper, and polishing a non-welding area with a surrounding edge of 3-6 mm by using 800# abrasive paper to ensure that metal luster is leaked; then putting the polished sample into a glass container with acetone, performing ultrasonic cleaning for 20min at the temperature of 40 ℃, and performing secondary cleaning and blow-drying by using alcohol;
(2) assembling the molybdenum-rhenium alloy foils to be welded on a clamp of a tool system, fixing the metal foils on two sides through pressing plates 1 and 2, keeping a distance of 1.2-1.6mm between the butt joint areas of the molybdenum-rhenium alloy foils, and simultaneously ensuring that the position of a welding line is positioned at the center of a base plate of the clamp after welding;
(3) adding a block-shaped brazing filler metal into the Ni-Mn-Cu-Zr brazing filler metal obtained by the existing preparation according to the volume of a lower bending area of a molybdenum-rhenium alloy butt joint area; brazing flux does not need to be added in the brazing implementation process;
(4) after the molybdenum-rhenium alloy foil and the brazing filler metal are filled and assembled, placing the alloy to be welded and the accessory fixture at the middle position of the upper and lower oppositely-opened induction coils, electrifying and heating for welding; the parameters of the high-frequency induction heating brazing process are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 45%, the electrifying time is 15s, and the highest temperature of induction heating is controlled at 1050 ℃. During welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butting.
The high-frequency induction heating brazing joint of the molybdenum-rhenium alloy (Mo50-Re50) obtained by the welding process is good in forming, cracks, pores and other microscopic defects are not found through appearance inspection and metallographic microscope observation of a welding seam, the room-temperature tensile strength can reach 815MPa (shown in Table 4), and the tensile strength of a base material reaches 78%. Meets the basic use requirement of the connected molybdenum-rhenium alloy.
TABLE 4 high-frequency induction heating test results of Mo-Re alloy soldered joint and base material tensile strength
Example 5
In the embodiment, Mo50-Re50 alloy foil is used as a workpiece to be welded, the size of the foil is 20mm multiplied by 80mm, and the thickness of the foil is 0.18 mm.
The specific Mo50-Re50 alloy foil high-frequency induction heating brazing process comprises the following steps:
(1) the lower bent direct welding areas 8 and the upper and lower surfaces nearby of the Mo50-Re50 alloy foils 3 and 4 are polished by abrasive paper, the non-welding areas are also polished to enable the surfaces to have metallic luster, and the welded workpieces are cleaned by an ultrasonic cleaner. The specific method comprises the following steps: polishing surface areas of two surfaces of a recurved area of the molybdenum-rhenium alloy foil by using 1200# abrasive paper, and polishing a non-welding area with a surrounding edge of 3-6 mm by using 800# abrasive paper to ensure that metal luster is leaked; then putting the polished sample into a glass container with acetone, performing ultrasonic cleaning for 20min at the temperature of 40 ℃, and performing secondary cleaning and blow-drying by using alcohol;
(2) assembling the molybdenum-rhenium alloy foils to be welded on a clamp of a tool system, fixing the metal foils on two sides through pressing plates 1 and 2, keeping a distance of 1.2-1.6mm between the butt joint areas of the molybdenum-rhenium alloy foils, and simultaneously ensuring that the position of a welding line is positioned at the center of a base plate of the clamp after welding;
(3) adding a block-shaped brazing filler metal into the Ni-Mn-Cu-Zr brazing filler metal obtained by the existing preparation according to the volume of a lower bending area of a molybdenum-rhenium alloy butt joint area; brazing flux does not need to be added in the brazing implementation process;
(4) after the molybdenum-rhenium alloy foil and the brazing filler metal are filled and assembled, placing the alloy to be welded and the accessory fixture at the middle position of the upper and lower oppositely-opened induction coils, electrifying and heating for welding; the parameters of the high-frequency induction heating brazing process are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 60%, the electrifying time is 28s, and the highest temperature of induction heating is controlled at 1050 ℃. During welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butting.
The high-frequency induction heating brazing joint of the molybdenum-rhenium alloy (Mo50-Re50) obtained by the welding process is good in forming, cracks, pores and other microscopic defects are not found through appearance inspection and metallographic microscope observation of a welding seam, the room-temperature tensile strength can reach 795MPa (shown in table 5), and the tensile strength of a base metal reaches 76%. Meets the basic use requirement of the connected molybdenum-rhenium alloy.
TABLE 5 high-frequency induction heating test results of Mo-Re alloy soldered joint and base material tensile strength
Example 6
In the embodiment, Mo50-Re50 alloy foil is used as a workpiece to be welded, the size of the foil is 20mm multiplied by 80mm, and the thickness of the foil is 0.18 mm.
The specific Mo50-Re50 alloy foil high-frequency induction heating brazing process comprises the following steps:
(1) the lower bent direct welding areas 8 and the upper and lower surfaces nearby of the Mo50-Re50 alloy foils 3 and 4 are polished by abrasive paper, the non-welding areas are also polished to enable the surfaces to have metallic luster, and the welded workpieces are cleaned by an ultrasonic cleaner. The specific method comprises the following steps: polishing surface areas of two surfaces of a recurved area of the molybdenum-rhenium alloy foil by using 1200# abrasive paper, and polishing a non-welding area with a surrounding edge of 3-6 mm by using 800# abrasive paper to ensure that metal luster is leaked; then putting the polished sample into a glass container with acetone, performing ultrasonic cleaning for 20min at the temperature of 40 ℃, and performing secondary cleaning and blow-drying by using alcohol;
(2) assembling the molybdenum-rhenium alloy foils to be welded on a clamp of a tool system, fixing the metal foils on two sides through pressing plates 1 and 2, keeping a distance of 1.2-1.6mm between the butt joint areas of the molybdenum-rhenium alloy foils, and simultaneously ensuring that the position of a welding line is positioned at the center of a base plate of the clamp after welding;
(3) adding a block-shaped brazing filler metal into the Ni-Mn-Cu-Zr brazing filler metal obtained by the existing preparation according to the volume of a lower bending area of a molybdenum-rhenium alloy butt joint area; brazing flux does not need to be added in the brazing implementation process;
(4) after the molybdenum-rhenium alloy foil and the brazing filler metal are filled and assembled, placing the alloy to be welded and the accessory fixture at the middle position of the upper and lower oppositely-opened induction coils, electrifying and heating for welding; the parameters of the high-frequency induction heating brazing process are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 75%, the electrifying time is 38s, and the highest temperature of induction heating is controlled at 1050 ℃. During welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butting.
The high-frequency induction heating brazing joint of the molybdenum-rhenium alloy (Mo50-Re50) obtained by the welding process is good in forming, cracks, pores and other microscopic defects are not found through appearance inspection and metallographic microscope observation of a welding seam, the room-temperature tensile strength can reach 775MPa (see table 6), and the tensile strength of a base material reaches 74%. Meets the basic use requirement of the connected molybdenum-rhenium alloy.
TABLE 6 high-frequency induction heating of Mo-Re alloy for soldered joints and tensile strength test results of base metal
The above-described embodiments are merely illustrative of the present invention and are not intended to be limiting thereof.
Claims (1)
1. A high-frequency induction heating brazing method of molybdenum-rhenium alloy foil is characterized in that the molybdenum-rhenium alloy foil with the thickness less than 0.2mm comprises the following steps:
(1) cutting and preprocessing the molybdenum-rhenium alloy foil to be welded into a required size; in order to realize effective welding of the molybdenum-rhenium alloy foil, two sides of the butt joint area of the alloy foil are prepared into a downward bending shape, the downward bending distance is less than or equal to 3mm, and the oblique angle of the downward bending single side is not more than 45 degrees;
(2) cleaning the to-be-welded area of the molybdenum-rhenium alloy foil;
(3) assembling the molybdenum-rhenium alloy foil to be welded on a clamp of a tool system, designing a downward bending butt joint structure, keeping a 1.2-1.6mm distance between butt joint areas of the molybdenum-rhenium alloy foil, and simultaneously ensuring that the position of a welding line is positioned at the center of a base plate of the clamp after welding;
(4) adding a block-shaped brazing filler metal according to the volume of a downward bending area of a molybdenum-rhenium alloy butt joint area to the Ni-Cr-Si-B brazing filler metal or the Ni-Mn-Cu-Zr brazing filler metal obtained by the conventional preparation method;
(5) after the molybdenum-rhenium alloy foil and the brazing filler metal are filled and assembled, placing the alloy to be welded and the accessory fixture at the middle position of the upper and lower oppositely-opened induction coils, electrifying and heating for welding; the parameters of the high-frequency induction heating brazing process are as follows: the power of the high-frequency generator is 5.5kW, the power ratio is 45-75%, the electrifying time is 15-40 s, and the highest temperature of induction heating is controlled at 1050 ℃; during welding, the molybdenum-rhenium alloy foil is butted with the metal in the downward bending area through the ceramic upper push rod to realize straight butting.
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| CN109940243B (en) * | 2019-05-13 | 2021-04-09 | 河南科技大学 | Induction brazing workpiece clamp |
| CN110900037B (en) * | 2019-12-13 | 2021-07-13 | 安泰天龙钨钼科技有限公司 | Brazing filler metal and method for welding molybdenum-rhenium alloy and steel |
| CN111014866A (en) * | 2019-12-24 | 2020-04-17 | 邯郸慧桥复合材料科技有限公司 | Brazing method for wear-resistant sheet |
| CN112276328A (en) * | 2020-10-09 | 2021-01-29 | 沈阳富创精密设备股份有限公司 | Application of vacuum electron beam welding on molybdenum-rhenium alloy welding |
| CN112317907B (en) | 2020-10-27 | 2022-01-28 | 西门子爱克斯射线真空技术(无锡)有限公司 | Brazing device and method for anode target disc |
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