CN101623785A - Method for brazing compact efficient titanium alloy plate-fin heat exchanger - Google Patents
Method for brazing compact efficient titanium alloy plate-fin heat exchanger Download PDFInfo
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- CN101623785A CN101623785A CN200810012229A CN200810012229A CN101623785A CN 101623785 A CN101623785 A CN 101623785A CN 200810012229 A CN200810012229 A CN 200810012229A CN 200810012229 A CN200810012229 A CN 200810012229A CN 101623785 A CN101623785 A CN 101623785A
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- 238000005219 brazing Methods 0.000 title claims abstract description 101
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000012360 testing method Methods 0.000 claims abstract description 34
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000010936 titanium Substances 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 21
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000002791 soaking Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000001307 helium Substances 0.000 claims abstract description 7
- 229910052734 helium Inorganic materials 0.000 claims abstract description 7
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000005476 soldering Methods 0.000 claims description 60
- 229910000679 solder Inorganic materials 0.000 claims description 48
- 238000007789 sealing Methods 0.000 claims description 16
- 238000010304 firing Methods 0.000 claims description 15
- 230000007797 corrosion Effects 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 11
- 238000007493 shaping process Methods 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 238000011161 development Methods 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 9
- 238000002844 melting Methods 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract description 2
- 239000000945 filler Substances 0.000 abstract 4
- 238000003754 machining Methods 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910001040 Beta-titanium Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- 229910002482 Cu–Ni Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910010038 TiAl Inorganic materials 0.000 description 1
- 229910004696 Ti—Cu—Ni Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910001510 metal chloride Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a method for brazing a compact efficient titanium alloy plate-fin heat exchanger, which adopts an amorphous titanium based brazing filler metal brazing titanium alloy with lower melting point which is between 820 and 840 DEG C, wherein the optimum clearance of the amorphous titanium based brazing filler metal brazing titanium alloy is between 20 and 90 microns, the optimum brazing temperature is between 850 and 900 DEG C, the optimum brazing time is between 10 and 15 minutes, the heating rate before soaking a workpiece is between 10 and 15 DEG C per minute, the heating rate for brazing after the soaking is 15 DEG C per minute, the cooling rate for the brazing filler metal to become solid from liquid is not less than 15 DEG C per minute, and a vacuum system only can be closed when the temperature is below 150 DEG C. Through strict selection and purchase of materials, precise part machining, careful part cleaning, brazing filler metal arrangement according to a process, precise assembling and clamping, and performing brazing according to a stated brazing process, a helium gas leakage test shows that the integral leakage of the product is 9*10<-8>PaM<3>/S which is in accordance with the standard requirement.
Description
Technical field
The present invention relates to mechanical welding science, a kind of method for brazing compact efficient titanium alloy plate-fin heat exchanger is provided especially.
Background technology
Plate-fin heat exchanger is compared with traditional shell-and-tube heat exchanger has many advantages: heat transfer efficiency height, compact conformation, light and handy firmly, adaptability is strong, can do the heat exchange of gas-gas, solution-air and liquid-liquid, also can do condensation and evaporation.It can be used for the situation of adverse current, following current, cross-flow or wrong adverse current, is suitable for the heat exchange of multiple different medium in same equipment, and therefore, the application of plate fin type heat exchanger is extensive especially.Maximum as using at industry aluminum plate-fin heat exchangers such as automobile, household electrical appliances, but in fields such as petrochemical industry, refrigeration, medicine, atomic energy, Aero-Space, aluminum plate-fin heat exchanger can not satisfy high temperature resistant, high pressure resistant, erosion-resisting requirement.The austenite stainless steel plate fin heat exchanger is with its good heat-resisting quantity, barotolerance, corrosion resistance, solderability, processability and ductility, becomes in these fields to have one of heat transmission equipment of wide development prospect.But for heat exchanger applied in the marine ships power set, because the requirement of particular surroundings, aluminium and fine-type stainless steel plate heat exchanger all can not meet the demands, and titanium all has very high corrosion resistance in seawater, atmosphere and most metal chlorides, wet chlorine and many organic acids.Therefore, not only can satisfy high temperature resistant, the corrosion resistant requirement of Ship Power Equipment with the plate-fin heat exchanger of titanium alloy manufacturing, and also have good application prospects in other field.
At present, the manufacturing process of aluminium alloy plate fin heat exchanger is quite ripe, and the manufacturing process of fine-type stainless steel plate heat exchanger is mature on the whole, but to the manufacturing of titanium alloy plate-fin heat exchanger, particularly the manufacturing process of the titanium alloy plate-fin heat exchanger of titanium based solder soldering has its novelty.
Titanium and titanium alloy thereof since have low-density, high strength, corrosion-resistant, endurance is heat-resisting and the operating temperature of advantage, particularly titanium alloy such as high specific strength can reach 600 ℃, can be operated in same temperature range with some steel and Ni base alloy.Soldering is the important method of attachment of titanium or titanium alloy, along with the development of modern soldering processes and solder, requires the performance of soldered fitting should be consistent with the mother metal performance level, also is like this to titanium alloy plate-fin heat exchanger.Titanium alloy divides alpha titanium alloy, beta-titanium alloy and alpha+beta titanium alloys by tissue, and the structure property characteristic of titanium alloy must be subjected to the restriction of brazing temperature and holding time when having determined the titanium alloy soldering.Because when heating-up temperature near or surpass α → β (transition temperature of or alpha+beta → β), the crystal grain of β phase can sharply be grown up, and organizes remarkable alligatoring, and the mother metal performance is descended.Simultaneously, in brazing process, mother metal and solder react, and can form new titanium base phase, and these titanium bases are the fragility phase mutually mostly, and their formation has a negative impact to soldered fitting, causes the deterioration of joint performance.Therefore, concerning the titanium alloy soldering, below beta transus temperature a basic principle, so both can keep the mother metal performance, also can form high performance soldered fitting.
The solder that is used for titanium or titanium alloy roughly is divided three classes: Ag base solder, Al base solder and Ti base solder.Ag base solder has appropriate melting point, and brazed seam has good plasticity, and shortcoming is that Ag base solder is very sensitive to chlorion, and it makes the corrosion resistance of soldered fitting reduce, and the elevated temperature strength of joint is low.A1 base solder low price, melting temperature is well below the transition temperature of β phase, and brazing temperature is low, the solder good fluidity, but the formation of TiAl intermetallic compound and the gathering of Al are arranged, shortcoming such as its soldered fitting intensity is low, fragility is big, fatigue strength is low, not shock-resistant after the soldering.Ti-Cu-Ni and Ti-Zr-Cu-Ni series solder are titanium, titanium alloy soldering best choice, and its distinguishing feature is that joint can use under high temperature and strong corrosive medium, and its mechanical property and decay resistance can reach with the approaching level of mother metal.Manufacturing for titanium alloy plate-fin heat exchanger, 0.1mm the soldered fitting of parts such as thick TA1 fin and dividing plate, strip of paper used for sealing, should guarantee certain strength of joint and ratio of brazing area, guarantee that again corrode does not take place thin fin, therefore, the selection of solder and soldering processes are the keys that guarantee the titanium alloy plate-fin heat exchanger quality.
Summary of the invention
The objective of the invention is at the problems referred to above, the manufacturing process of compact efficient titanium alloy plate-fin heat exchanger is developed, propose a kind of new technology of using the one-time formed manufacturing compact efficient titanium alloy plate-fin heat exchanger of titanium based solder vacuum brazing.For approach has been opened up in the manufacturing of titanium alloy plate-fin heat exchanger.
The invention provides a kind of method for brazing compact efficient titanium alloy plate-fin heat exchanger, its described method for welding is:
1) part preparation: dimensioned on request such as dividing plate, strip of paper used for sealing, adapter, material is the TC4 alloy; Fin is stamped to form with the shaping punch die on the automatic forming lathe by the thick TA1 titanium foil of 0.1mm;
2) preweld cleaning: the part of titanium alloy plate-fin heat exchanger needed before soldering through cleaning completely, so that remove foreign matter and the grease that adheres on all surfaces; The employing pickling removes and deoils, dirty, oxide, washes with water under high pressure again;
3) part assembling and solder are arranged: all connected modes of titanium alloy plate-fin heat exchanger main parts size fin, dividing plate, strip of paper used for sealing, adapter are lead welding and shapings; Before the assembling, except cleaning through strictness, each component surface is also answered deburring, smooth; Be assembled on the special platform position and carry out; During assembling, the amorphous state titanium based solder is sheared by dimensional requirement, and sticked between corresponding dividing plate, fin, adapter, the strip of paper used for sealing;
4) assembling of brazing jig: the self-regulation clamping force anchor clamps with development voluntarily are firm with the part clamping that assembles, misplace between the Assembly part when preventing soldering, and can regulate clamping force automatically according to the expansion situation of heating and cooling process, make the clamping force that remains certain numerical value between part, thereby guarantee brazing quality;
5) vacuum brazing;
6) test and inspection: the above-mentioned compact efficient titanium alloy plate-fin heat exchanger of making being carried out tests such as helium leak test, flow resistance test, pressure test and check, is qualified to reach corresponding requirement and standard;
It is characterized in that: 5) vacuum brazing: the above-mentioned part that assembles is sent into soldering oven, before the soldering, will vacuumize 1.5 * 10 in the soldering oven
-2Below the Pa, with the firing rate of 10-15 ℃/min with workpiece with the stove heat temperature raising to 780-820 ℃, be incubated 30-60 minute, make the temperature at each position of brazing member even; Soldering oven continues to be warming up to 850-900 ℃, this temperature is the brazing temperature of titanium alloy, titanium based solder is in best flow regime under this temperature, the titanium foil fin there is not big corrosion, be incubated 10～15 minutes, cooling is chilled to tapping temperature below 150 ℃ with stove fast, closes vacuum system in case oxidation stain.
Described method for brazing compact efficient titanium alloy plate-fin heat exchanger, the amorphous state titanium-cuprum base solder brazing titanium alloy that the employing fusing point is 820-840 ℃ lower.
Described method for brazing compact efficient titanium alloy plate-fin heat exchanger, the best clearance of amorphous state titanium-cuprum base solder brazing titanium alloy is 20-90 μ m.
Described method for brazing compact efficient titanium alloy plate-fin heat exchanger, best brazing temperature are 850-900 ℃, and the best holding time is 10-15min.
Firing rate before the described method for brazing compact efficient titanium alloy plate-fin heat exchanger, workpiece soaking is 10-15 ℃/min, and the firing rate of soldering is 15 ℃/min after the soaking.
Described method for brazing compact efficient titanium alloy plate-fin heat exchanger, the cooling velocity of workpiece want fast, and the cooling velocity of solder from liquid state to solid-state interval should can not closed vacuum system when being cooled to below 150 ℃ less than 15 ℃/min.
Titanium based solder to development voluntarily carries out tests such as fusing point test, wetability and flowability, is convenient to tentatively determine soldering processes; Carry out the soldering of soldering test specimen, the test specimen after the soldering is processed tensile sample by standard, and carries out the stretching test measurement hot strength, finds out suitable soldering processes; The joint that adopts suitable soldering processes soldering is carried out the metallographic test analysis, and by the reasonability of fabric analysis affirmation soldering processes, the step of going forward side by side is put in order soldering processes; The analog equipment test, 0.1mm fin and dividing plate carry out the product simulation soldering, and carry out the inspection of ratio of brazing area and corrode situation, so that can determine the product soldering processes; Product parts qualified product workpiece of assembling after operations such as processing, cleaning, layout solder, part assembling is gone into vacuum brazing furnace, carries out soldering by the soldering processes of evaluating; Product carries out visual examination after the soldering, carries out checkout facilities such as pressure test, helium leak check after qualified, to guarantee the product quality of titanium alloy plate-fin heat exchanger.
Adopt low melting point solder and corresponding technology, the plate fin structure of soldering 0.1mm is one of innovative point, because, brazing temperature height or holding time, the long corrosion phenomenon that 0.1mm plate wing occurs that all means was organized the appearance of fragility phase, and the low decline that means brazing quality of temperature, therefore, the selection of solder and soldering processes window is definite most important to this structure.The main key point of technology is: the limits of heating and cooling speed when the design of brazing temperature, holding time, joint clearance of brazing and soldering.
Advantage of the present invention: manufacture method of the present invention has improved the workmanship of titanium alloy plate-fin heat exchanger, the hot strength of joint and the corrosive nature of complex dielectrics such as creep rupture life, air-tightness and sea water resistance, has guaranteed the running quality of this heat exchanger product under complex environment.
The specific embodiment
Embodiment 1
Present embodiment provides a kind of method for brazing compact efficient titanium alloy plate-fin heat exchanger, and its described method for welding is:
1) part preparation: dimensioned on request such as dividing plate, strip of paper used for sealing, adapter, material is the TC4 alloy; Fin is stamped to form with the shaping punch die on the automatic forming lathe by the thick TA1 titanium foil of 0.1mm;
2) preweld cleaning: the part of titanium alloy plate-fin heat exchanger needed before soldering through cleaning completely, so that remove foreign matter and the grease that adheres on all surfaces; The employing pickling removes and deoils, dirty, oxide, washes with water under high pressure again;
3) part assembling and solder are arranged: all connected modes of titanium alloy plate-fin heat exchanger main parts size fin, dividing plate, strip of paper used for sealing, adapter are lead welding and shapings; Before the assembling, except cleaning through strictness, each component surface is also answered deburring, smooth; Be assembled on the special platform position and carry out; During assembling, the amorphous state titanium based solder is sheared by dimensional requirement, and sticked between corresponding dividing plate, fin, adapter, the strip of paper used for sealing;
4) assembling of brazing jig: the self-regulation clamping force anchor clamps with development voluntarily are firm with the part clamping that assembles, misplace between the Assembly part when preventing soldering, and can regulate clamping force automatically according to the expansion situation of heating and cooling process, make the clamping force that remains certain numerical value between part, thereby guarantee brazing quality;
5) vacuum brazing;
6) test and inspection: the above-mentioned compact efficient titanium alloy plate-fin heat exchanger of making being carried out tests such as helium leak test, flow resistance test, pressure test and check, is qualified to reach corresponding requirement and standard;
Wherein 5) vacuum brazing: the above-mentioned part that assembles is sent into soldering oven, before the soldering, will vacuumize 1.5 * 10 in the soldering oven
-2Below the Pa, with the firing rate of 13 ℃/min with workpiece with stove heat temperature raising to 800 ℃, be incubated 45 minutes, make the temperature at each position of brazing member even; Soldering oven continues to be warming up to 880 ℃, this temperature is the brazing temperature of titanium alloy, titanium based solder is in best flow regime under this temperature, the titanium foil fin there is not big corrosion, be incubated 13 minutes, cooling is chilled to tapping temperature below 150 ℃ with stove fast, closes vacuum system in case oxidation stain.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the amorphous state titanium-cuprum base solder brazing titanium alloy that the employing fusing point is 820-840 ℃ lower.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the best clearance of amorphous state titanium-cuprum base solder brazing titanium alloy is 20-90 μ m.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, best brazing temperature are 880 ℃, and the best holding time is 13min.
Firing rate before the described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, workpiece soaking is 13 ℃/min, and the firing rate of soldering is 15 ℃/min after the soaking.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the cooling velocity of workpiece want fast, and the cooling velocity of solder from liquid state to solid-state interval should can not closed vacuum system when being cooled to below 150 ℃ less than 15 ℃/min.
Embodiment 2
Present embodiment provides a kind of method for brazing compact efficient titanium alloy plate-fin heat exchanger, and its described method for welding is:
1) part preparation: dimensioned on request such as dividing plate, strip of paper used for sealing, adapter, material is the TC4 alloy; Fin is stamped to form with the shaping punch die on the automatic forming lathe by the thick TA1 titanium foil of 0.1mm;
2) preweld cleaning: the part of titanium alloy plate-fin heat exchanger needed before soldering through cleaning completely, so that remove foreign matter and the grease that adheres on all surfaces; The employing pickling removes and deoils, dirty, oxide, washes with water under high pressure again;
3) part assembling and solder are arranged: all connected modes of titanium alloy plate-fin heat exchanger main parts size fin, dividing plate, strip of paper used for sealing, adapter are lead welding and shapings; Before the assembling, except cleaning through strictness, each component surface is also answered deburring, smooth; Be assembled on the special platform position and carry out; During assembling, the amorphous state titanium based solder is sheared by dimensional requirement, and sticked between corresponding dividing plate, fin, adapter, the strip of paper used for sealing;
4) assembling of brazing jig: the self-regulation clamping force anchor clamps with development voluntarily are firm with the part clamping that assembles, misplace between the Assembly part when preventing soldering, and can regulate clamping force automatically according to the expansion situation of heating and cooling process, make the clamping force that remains certain numerical value between part, thereby guarantee brazing quality;
5) vacuum brazing;
6) test and inspection: the above-mentioned compact efficient titanium alloy plate-fin heat exchanger of making being carried out tests such as helium leak test, flow resistance test, pressure test and check, is qualified to reach corresponding requirement and standard;
Wherein 5) vacuum brazing: the above-mentioned part that assembles is sent into soldering oven, before the soldering, will vacuumize 1.5 * 10 in the soldering oven
-2Below the Pa, with the firing rate of 10 ℃/min with workpiece with stove heat temperature raising to 780 ℃, be incubated 30 minutes, make the temperature at each position of brazing member even; Soldering oven continues to be warming up to 850 ℃, this temperature is the brazing temperature of titanium alloy, titanium based solder is in best flow regime under this temperature, the titanium foil fin there is not big corrosion, be incubated 15 minutes, cooling is chilled to tapping temperature below 150 ℃ with stove fast, closes vacuum system in case oxidation stain.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the amorphous state titanium-cuprum base solder brazing titanium alloy that the employing fusing point is 820-840 ℃ lower.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the best clearance of amorphous state titanium-cuprum base solder brazing titanium alloy is 20-90 μ m.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, best brazing temperature are 850 ℃, and the best holding time is 15min.
Firing rate before the described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, workpiece soaking is 10 ℃/min, and the firing rate of soldering is 15 ℃/min after the soaking.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the cooling velocity of workpiece want fast, and the cooling velocity of solder from liquid state to solid-state interval should can not closed vacuum system when being cooled to below 150 ℃ less than 15 ℃/min.
Embodiment 3
Present embodiment provides a kind of method for brazing compact efficient titanium alloy plate-fin heat exchanger, and its described method for welding is:
1) part preparation: dimensioned on request such as dividing plate, strip of paper used for sealing, adapter, material is the TC4 alloy; Fin is stamped to form with the shaping punch die on the automatic forming lathe by the thick TA1 titanium foil of 0.1mm;
2) preweld cleaning: the part of titanium alloy plate-fin heat exchanger needed before soldering through cleaning completely, so that remove foreign matter and the grease that adheres on all surfaces; The employing pickling removes and deoils, dirty, oxide, washes with water under high pressure again;
3) part assembling and solder are arranged: all connected modes of titanium alloy plate-fin heat exchanger main parts size fin, dividing plate, strip of paper used for sealing, adapter are lead welding and shapings; Before the assembling, except cleaning through strictness, each component surface is also answered deburring, smooth; Be assembled on the special platform position and carry out; During assembling, the amorphous state titanium based solder is sheared by dimensional requirement, and sticked between corresponding dividing plate, fin, adapter, the strip of paper used for sealing;
4) assembling of brazing jig: the self-regulation clamping force anchor clamps with development voluntarily are firm with the part clamping that assembles, misplace between the Assembly part when preventing soldering, and can regulate clamping force automatically according to the expansion situation of heating and cooling process, make the clamping force that remains certain numerical value between part, thereby guarantee brazing quality;
5) vacuum brazing;
6) test and inspection: the above-mentioned compact efficient titanium alloy plate-fin heat exchanger of making being carried out tests such as helium leak test, flow resistance test, pressure test and check, is qualified to reach corresponding requirement and standard;
Wherein 5) vacuum brazing: the above-mentioned part that assembles is sent into soldering oven, before the soldering, will vacuumize 1.5 * 10 in the soldering oven
-2Below the Pa, with the firing rate of 15 ℃/min with workpiece with stove heat temperature raising to 820 ℃, be incubated 60 minutes, make the temperature at each position of brazing member even; Soldering oven continues to be warming up to 900 ℃, this temperature is the brazing temperature of titanium alloy, titanium based solder is in best flow regime under this temperature, the titanium foil fin there is not big corrosion, be incubated 10 minutes, cooling is chilled to tapping temperature below 150 ℃ with stove fast, closes vacuum system in case oxidation stain.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the amorphous state titanium-cuprum base solder brazing titanium alloy that the employing fusing point is 820-840 ℃ lower.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the best clearance of amorphous state titanium-cuprum base solder brazing titanium alloy is 20-90 μ m.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, best brazing temperature are 900 ℃, and the best holding time is 10min.
Firing rate before the described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, workpiece soaking is 15 ℃/min, and the firing rate of soldering is 15 ℃/min after the soaking.
The described method for brazing compact efficient titanium alloy plate-fin heat exchanger of present embodiment, the cooling velocity of workpiece want fast, and the cooling velocity of solder from liquid state to solid-state interval should can not closed vacuum system when being cooled to below 150 ℃ less than 15 ℃/min.
Claims (6)
1, a kind of method for brazing compact efficient titanium alloy plate-fin heat exchanger, its described method for welding is:
1) part preparation: dimensioned on request such as dividing plate, strip of paper used for sealing, adapter, material is the TC4 alloy; Fin is stamped to form with the shaping punch die on the automatic forming lathe by the thick TA1 titanium foil of 0.1mm;
2) preweld cleaning: the part of titanium alloy plate-fin heat exchanger needed before soldering through cleaning completely, so that remove foreign matter and the grease that adheres on all surfaces; The employing pickling removes and deoils, dirty, oxide, washes with water under high pressure again;
3) part assembling and solder are arranged: all connected modes of titanium alloy plate-fin heat exchanger main parts size fin, dividing plate, strip of paper used for sealing, adapter are lead welding and shapings; Before the assembling, except cleaning through strictness, each component surface is also answered deburring, smooth; Be assembled on the special platform position and carry out; During assembling, the amorphous state titanium based solder is sheared by dimensional requirement, and sticked between corresponding dividing plate, fin, adapter, the strip of paper used for sealing;
4) assembling of brazing jig: the self-regulation clamping force anchor clamps with development voluntarily are firm with the part clamping that assembles, misplace between the Assembly part when preventing soldering, and can regulate clamping force automatically according to the expansion situation of heating and cooling process, make the clamping force that remains certain numerical value between part, thereby guarantee brazing quality;
5) vacuum brazing;
6) test and inspection: the above-mentioned compact efficient titanium alloy plate-fin heat exchanger of making being carried out tests such as helium leak test, flow resistance test, pressure test and check, is qualified to reach corresponding requirement and standard;
It is characterized in that: 5) vacuum brazing: the above-mentioned part that assembles is sent into soldering oven, before the soldering, will vacuumize 1.5 * 10 in the soldering oven
-2Below the Pa, with the firing rate of 10-15 ℃/min with workpiece with the stove heat temperature raising to 780-820 ℃, be incubated 30-60 minute, make the temperature at each position of brazing member even; Soldering oven continues to be warming up to 850-900 ℃, this temperature is the brazing temperature of titanium alloy, titanium based solder is in best flow regime under this temperature, the titanium foil fin there is not big corrosion, be incubated 10～15 minutes, cooling is chilled to tapping temperature below 150 ℃ with stove fast, closes vacuum system in case oxidation stain.
2, according to the described method for brazing compact efficient titanium alloy plate-fin heat exchanger of claim 1, it is characterized in that: the amorphous state titanium-cuprum base solder brazing titanium alloy that adopts 820-840 ℃ lower of fusing point.
3, according to the described method for brazing compact efficient titanium alloy plate-fin heat exchanger of claim 1, it is characterized in that: the best clearance of amorphous state titanium-cuprum base solder brazing titanium alloy is 20-90 μ m.
4, according to the described method for brazing compact efficient titanium alloy plate-fin heat exchanger of claim 1, it is characterized in that: best brazing temperature is 850-900 ℃, and the best holding time is 10-15min.
5, according to the described method for brazing compact efficient titanium alloy plate-fin heat exchanger of claim 1, it is characterized in that: the firing rate before the workpiece soaking is 10-15 ℃/min, and the firing rate of soldering is 15 ℃/min after the soaking.
6, according to the described method for brazing compact efficient titanium alloy plate-fin heat exchanger of claim 1, it is characterized in that: the cooling velocity of workpiece wants fast, the cooling velocity of solder from liquid state to solid-state interval should can not closed vacuum system when being cooled to below 150 ℃ less than 15 ℃/min.
Priority Applications (1)
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