CN109759663A - A kind of stainless steel/aluminium alloy heterogenous metal brazing attachment method - Google Patents
A kind of stainless steel/aluminium alloy heterogenous metal brazing attachment method Download PDFInfo
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- CN109759663A CN109759663A CN201910044322.9A CN201910044322A CN109759663A CN 109759663 A CN109759663 A CN 109759663A CN 201910044322 A CN201910044322 A CN 201910044322A CN 109759663 A CN109759663 A CN 109759663A
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Abstract
The present invention relates to a kind of stainless steel/aluminium alloy heterogenous metal brazing attachment methods, clear up stainless steel pipe tining surface, carry out scraping, cleaning to aluminium alloy flange disk tin filling rooved face, then carry out heating soldering attaching again, finally clean product.And detected, meet product Eligibility requirements to ensure.Due to having carried out scraping process after heating process after the washing, the rotation soldering attaching under mandrel guiding is carried out again, reduce temperature field difference, reduce oxide residual, promote the precipitation ability of liquid tin solder joint stomata, therefore during stainless steel pipe and the soldering attaching of aluminium alloy flange disk, the defects of stomata and oxide slag inclusion has obtained effective control, qualification rate is significantly promoted, and the technique for meeting product soldering attaching process control requires and product qualification requirement.
Description
Technical field
The present invention relates to a kind of stainless steel/aluminium alloy heterogenous metal brazing attachment methods, belong to welding technology field.
Background technique
As stainless steel/aluminium alloy dissimilar metal tin-lead solder attaching process, attaching technique is to stainless steel/aluminium alloy
Heterogenous metal brazing has great influence.
Steel/aluminium welding structure has important application in industrial departments such as aerospace, communications and transportation, national defence.But the two
Connectivity problem is always the technological difficulties of welding field.All the time, it is carried out both at home and abroad in steel/aluminum dissimilar metal connection area
A large amount of research work, and realize the engineer application in the non-tights structure such as automobile, satellite, high-speed rail, aircraft.
Stainless steel/aluminium alloy dissimilar metal guide-tube structure welding containment member is used in existing method.Product manufacturing
Unit realizes engineer application using tin-lead soldering process, but weak ring is always existed in terms of brazing quality stability control
Section.Wherein, the attachment method of product brazing process is also the key factor for causing brazing quality unstable.
It is to need to carry out again to be heated to tin-lead solder after the completion of tin filling, machining additionally, due to aluminium alloy flange disk
When fusing, the attaching process of product is carried out.During attaching, correct operation control evades defect and generates, promotes pricker when preventing
Stitch the volume critical process of quality.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of stainless steel/aluminium alloy heterogenous metal brazings
Attachment method, solve soldering in stomata, oxidation, slag inclusion the defects of generate caused by product be unsatisfactory for asking for brazed seam criterion of acceptability
Topic.
The object of the invention is achieved by following technical solution:
A kind of stainless steel/aluminium alloy heterogenous metal brazing attachment method is provided, steps are as follows:
(1) blast, zinc-plated, copper plating treatment are carried out to the molten tin bath of Al alloy parts；To the molten tin bath tin filling of Al alloy parts, then
Carry out whole anodization；
(2) stainless steel pipe surface is cleared up；
(3) the Al alloy parts molten tin bath surface after anodization is cleared up；
(4) Al alloy parts are put into soldering oven and are heated to brazing filler metal melts and take out；
(5) stainless steel pipe is packed into molten tin bath, solidified to solder；
(6) it is cleaned.
Preferably, cleaning stainless steel pipe surface include: by the place's alcohol washes to be brazed of stainless steel pipe after tining simultaneously
Then drying smears one layer of micro- active brazing flux on tining surface.
Preferably, micro- active brazing flux is liquid tin.
Preferably, it includes: first by the aluminium alloy work after anodization that Al alloy parts molten tin bath surface, which carries out cleaning, in step (3)
The anodization material on part molten tin bath surface scrapes off, then with alcohol washes Al alloy parts and dries up.
Preferably, Al alloy parts are put into the specific side for being heated to brazing filler metal melts in soldering oven and taking out in step (4)
Method are as follows: soldering oven is heated to 85~95 DEG C, 1 hour is kept the temperature, then Al alloy parts is put into electric furnace and are heated, it is molten to solder
It after change, is taken out from electric furnace, then scrapes off the solder that Al alloy parts molten tin bath inner surface portion is aoxidized by heating.
It preferably, further include rotating clockwise 2-3 circle, then turn counterclockwise by stainless steel pipe loading molten tin bath in step (5)
Dynamic 2-3 circle, adds solder, brazing flux as needed therebetween, guarantees that welding angle is full.
Preferably, cleaning is carried out in step (6) includes:
6.1 are put into drying in 50~60 DEG C of flowing hot waters after cleaning；
6.2 are put into alcohol and impregnate, clean and dry up；
6.3 carry out brazed seam cleaning by the way of mechanical, until visually observation is without residual brazing flux.
Preferably, it includes: using bread outside the rigid welding wire for curving annular shape that brazed seam cleaning is carried out by the way of mechanical
It wraps up in silk and dips alcohol, cover the outside in stainless steel pipe and brazed seam is cleared up.
It preferably, further include step (7), the subassembly product after soldering carries out air-tight test, does not allow to leak at brazed seam.
Preferably, further include step (8), CT scan imaging inspection is carried out to weld seam, not allowing to exist at brazed seam is more than mark
Quasi- stomata, slag inclusion or incomplete fusion.
Preferably, further include step (9), carry out endoscope detecting, do not allow to have remaining brazing flux at brazed seam.
Preferably, blast described in step (1) includes the following steps:
A. the cleaning of aluminium alloy flange panel surface, inspection；
B. positioner clamping Al alloy parts are used, positioner inclination angle theta is set；Positioner revolving speed is adjusted, so that aluminium alloy
Constant linear velocity needed for workpiece blast face is kept；Spray gun blast straight down；
C. the posture for adjusting positioner completes the blast of molten tin bath inner surface；
D. visual examination is carried out to blast face, if the requirements are not met then blast again.
Preferably, the posture that positioner is adjusted in step c completes the blast of narrow deep trouth inner surface, comprising: positioner difference
It rotates horizontally and completes molten tin bath bottom blast, inward slant θ simultaneously rotates, and completes the blast of molten tin bath inner groove surface, is inclined outwardly θ and revolves
Turn, completes the blast of molten tin bath outer well surface.
Preferably, zinc-plated described in step (1) to include the following steps:
A. Al alloy parts are processed by shot blasting using chemical polishing solution；
B. caustic corrosion is carried out to Al alloy parts and cleaned；
C. light is carried out out to Al alloy parts and cleaned；
D. zinc is soaked for the first time, and is cleaned；
E. zinc is soaked again, and is cleaned.
Preferably, zinc method is soaked for the first time in step d are as follows: 60~80s is impregnated in 30~40 DEG C of zinc dipping solutions, until aluminium closes
The molten tin bath of metal working part produces uniform Dark grey film.
Preferably, zinc method is soaked again in step e are as follows: zinc bath controls temperature using heating water bath mode, 30~40
60~70s is impregnated in DEG C solution, until the molten tin bath of Al alloy parts generates uniform lark film.
Preferably, copper facing described in step (1) includes the following steps:
One, a copper facing
1.1 by complete it is zinc-plated after Al alloy parts molten tin bath using copper facing tank liquor carry out dash current copper facing, single aluminium
Alloy workpiece current strength is 80~110A/dm2；
The 1.2 molten tin bath copper facing using copper facing tank liquor to Al alloy parts, single part current strength are 15~30A/dm2；
1.3 cleaning aluminum alloy workpiece；
Two, secondary copper facing
2.1 carry out dash current copper facing using copper facing tank liquor, and single part current strength is 50~70A/dm2；
The 2.2 molten tin bath copper facing using copper facing tank liquor to Al alloy parts, single part current strength are 10~20A/dm2
2.3 cleaning aluminum alloy workpiece simultaneously dry up.
Preferably, a copper facing is carried out in zinc-plated rear 1.5min.
Preferably, when carrying out dash current copper facing in step 1.1, copper facing tank liquor temperature is 15~40 DEG C, electroplating time 2~
4min, in impact process, Al alloy parts are moved back and forth and are circumferentially rotated；Using copper facing tank liquor to aluminium alloy in step 1.2
The molten tin bath of workpiece is copper-plated method particularly includes: copper facing tank liquor temperature is 15~40 DEG C, 2~4min of electroplating time, Al alloy parts
It moves back and forth and circumferentially rotates.
Preferably, it is less than 2min to the time interval that step 2.1 starts after the completion of step 1.2.
Preferably, dash current copper facing is carried out using copper facing tank liquor in step 2.1 method particularly includes: copper facing tank liquor temperature 15
~35 DEG C, 2~4min of electroplating time, in impact process, Al alloy parts are moved back and forth and are circumferentially rotated；It is adopted in step 2.2
It is copper-plated to the narrow deep trouth of aluminium alloy flange disk with copper facing tank liquor method particularly includes: 15~40 DEG C of copper facing tank liquor temperature, electroplating time 7
~9min, in impact process, Al alloy parts are moved back and forth and are circumferentially rotated.
Preferably, primary, the secondary copper-plated tank liquor is copper cyanide solution.
Preferably, the molten tin bath is annular groove, and groove depth is 15~25mm, and groove width is 3~10mm.
The invention has the following advantages over the prior art:
(1) due to carrying out scraping process after the washing, scraping process is carried out after heating again, then is brazed the use of attaching process
Method that is suitable, rotating counterclockwise, to control the generation of the excessive defects such as stomata, oxidation, slag inclusion, incomplete fusion, to be met
The ratio of brazing area of solder joint standard requirements.
(2) in the cleaning process carried out after soldering, in the case where 50~60 DEG C of flowing hot water drink the synergy of alcohol washes,
So that pH value between 5~8, ensure that the requirement of subsequent product test storage.
(3) present invention carries out industry CT scanography and endoscopy to product, ensure that preceding weld seam inside and outside quality,
Make the control of its quality state in acceptability limit.
Detailed description of the invention
Fig. 1 is stainless steel pipe structural schematic diagram；
Fig. 2 is aluminium alloy flange disk schematic diagram；
Fig. 3 is mandrel schematic diagram；
Fig. 4 is heating furnace schematic diagram；
Fig. 5 is product attaching schematic diagram.
Specific embodiment
There is the aluminium alloy flange disk that the present invention is directed to annular groove to weld as molten tin bath and stainless steel pipe, molten tin bath
Inside first carry out blast, leaching zinc, plating copper process.Guarantee molten tin bath surface roughness consistency during blast, during leaching zinc, copper facing
Guarantee the uniformity of zinc, copper.Molten tin bath is narrow slit, and depth is deeper, is unfavorable for being brazed.The present invention provides a kind of suitable for stainless
Steel/aluminium alloy heterogenous metal brazing attachment method, this method comprises the following steps:
(1) blast, zinc-plated, copper plating treatment are carried out to the molten tin bath of Al alloy parts；To the molten tin bath tin filling of Al alloy parts, then
Carry out whole anodization；
(2) stainless steel pipe surface is cleared up
First by the place's alcohol washes to be brazed of stainless steel pipe after tining and dry up, then tining surface smear one layer it is micro-
Active brazing flux；Micro- active brazing flux is liquid tin.
(3) the molten tin bath tin filling of the aluminium alloy flange disk after copper facing, then whole anodization is carried out, after anodization
Aluminium alloy flange disk molten tin bath surface cleared up.
First the anodization material on the aluminium alloy flange disk molten tin bath surface after anodization is scraped off, then with alcohol washes ring flange
And it dries up.
(4) it heats
Soldering oven is heated to 85~95 DEG C of sections, keeps the temperature 1 hour, then cleaned ring flange is put into electric furnace and is added
Heat is taken out from electric furnace after brazing filler metal melts, then scrapes off the solder that ring flange molten tin bath inner surface portion is aoxidized by heating.
(5) welding equipment
It by the centre bore of mandrel insertion ring flange, is oriented to, then bellows is inserted into molten tin annular groove through mandrel, tin with mandrel
Tin in slot keeps melting state, rotates clockwise 2-3 circle, then rotates counterclockwise 2-3 circle, adds solder, pricker as needed therebetween
Agent after waiting solders to solidify, then wipes brazing flux.Guarantee that welding angle is full.
(6) it cleans
A) hot water cleans
The product being brazed is put into after being cleaned in 50~60 DEG C of flowing hot waters, drying.
B) alcohol washes
Further to remove remaining oxide and water stain, progress alcohol immersion and cleaning after hot water cleaning, drying.
C) mechanical chipping
Silk is wrapped using the rigid welding wire for curving annular shape and dips alcohol, is further cleared up inside and outside brazed seam,
Until not remaining brazing flux until visually observing, drying.
(7) airtight experiment
A) test fixture
Prepare air seal test fixture, and clean with alcohol washes.
B) it is loaded
Subassembly product after steel/aluminum dissimilar metal soldering is fitted into air seal test fixture, length is guaranteed by tooling, is prevented
Deformation of products.
C) pressure testing
It is passed through the air of 0.6MPa to inner cavity, sub-assembly is put into alcohol, is kept for 5 minutes, does not allow to leak.Detect pricker
Stitch leakproofness.
D) release
Vent valve is opened, after abundant release, dismounting fixture with alcohol washes subassembly product and is dried up.
(8) CT examination
Product is subjected to CT scan imaging inspection to weld seam with industrial CT system, do not allow there are overproof stomata,
The defects of slag inclusion, incomplete fusion.
(9) endoscope detecting
Product is subjected to endoscope detecting, does not allow to there are the attachments such as remaining brazing flux.
Blast needs to guarantee the uniformity of blast in step (1), specifically comprises the following steps:
A. the cleaning of aluminium alloy flange panel surface, inspection；
B. positioner clamping Al alloy parts are used, positioner is able to drive aluminium alloy flange axial-rotation and inclination, becomes
Position machine inclination angle theta can ± 90 ° displacement, the scroll chuck of aluminium alloy flange clamping to positioner.Positioner inclination angle theta is set；It adjusts
Whole positioner revolving speed, so that Al alloy parts blast face keeps required constant linear velocity；Spray gun blast straight down；Spray gun and aluminium
Alloy ring flange piece surface height distance is 100~300mm, and blast pressure is 0.5MPa~1.5MPa.
C. the posture for adjusting positioner completes the blast of molten tin bath inner surface；Positioner rotates horizontally respectively completes molten tin bath bottom
Blast, inward slant θ simultaneously rotate, and complete the blast of molten tin bath inner groove surface, are inclined outwardly θ and rotate, and complete blowing for molten tin bath outer well surface
Sand.3~6 turns of positioner rotation, the blast of narrow deep trouth inner groove surface and blowing for narrow deep trouth outer well surface are controlled during slot bottom blast
Positioner is controlled during sand rotates 5~8 turns or slot bottom blast, the blast of narrow deep trouth inner groove surface and narrow deep trouth outer well surface
Blast, complete blast when blast face surface is in black grey.
D. visual examination is carried out to blast face, if the requirements are not met then blast again.
The zinc-plated uniformity for needing to guarantee leaching zinc, specifically comprises the following steps: in step (1)
A. Al alloy parts are processed by shot blasting using chemical polishing solution；
B. caustic corrosion is carried out to Al alloy parts and cleaned；
C. light is carried out out to Al alloy parts and cleaned；
D. zinc is soaked for the first time, and is cleaned；60~80s is impregnated in 30~40 DEG C of zinc dipping solutions, until the tin of Al alloy parts
Slot produces uniform Dark grey film.Workpiece is swung up and down 7~8 times in the sink, forbids overexertion bump injury workpiece.It takes out
Afterwards, with the water pipe of access Room temperature Mobil tap water or hydraulic giant to being rinsed in molten tin bath, at room temperature, until cleaning.
E. zinc is soaked again, and is cleaned.Zinc bath controls temperature using heating water bath mode, impregnates in 30~40 DEG C of solution
60~70s, until the molten tin bath of Al alloy parts generates uniform lark film.Workpiece swings up and down 7~8 times in the sink, sternly
Prohibit overexertion bump injury workpiece.After taking-up, with the water pipe of access Room temperature Mobil tap water or hydraulic giant to being rinsed in annular groove,
At room temperature, until cleaning.
Copper facing needs to guarantee that copper plate is continuous and uniformity in homogeneous thickness in step (1), carries out in 1.5min after zinc-plated
Copper facing.Specifically comprise the following steps:
One, a copper facing
1.1 by complete it is zinc-plated after Al alloy parts molten tin bath using copper facing tank liquor carry out dash current copper facing, single aluminium
Alloy workpiece current strength is 80~110A/dm2；Copper facing tank liquor temperature is 15~40 DEG C, and 2~4min of electroplating time impacted
Cheng Zhong, Al alloy parts are moved back and forth and are circumferentially rotated；
The 1.2 molten tin bath copper facing using copper facing tank liquor to Al alloy parts, single part current strength are 15~30A/dm2；
It is copper-plated using molten tin bath of the copper facing tank liquor to Al alloy parts method particularly includes: copper facing tank liquor temperature is 15~40 DEG C, when plating
Between 2~4min, Al alloy parts move back and forth and circumferentially rotate.
1.3 cleaning aluminum alloy workpiece.
Two, secondary copper facing
2.1 carry out dash current copper facing using copper facing tank liquor, and single part current strength is 50~70A/dm2；Step 1.2
It is less than 2min to the time interval that step 2.1 starts after the completion.
The 2.2 molten tin bath copper facing using copper facing tank liquor to Al alloy parts, single part current strength are 10~20A/dm2
2.3 cleaning aluminum alloy workpiece simultaneously dry up.
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, the narrow gap groove depth of aluminium alloy flange disk is Hb；Interior diameter N；Overall diameter W.Ring flange interior diameter is
D, overall diameter D.Axle diameter Φ c is less than ring flange diameter of bore Φ B, and mandrel height Hc is greater than parts product height Hd, and is
Solid construction.
Embodiment 1: aluminium alloy flange disk trench inner diameter Φ 70mm steel/aluminum dissimilar metal is brazed attachment method.
(1) stainless steel pipe surface is cleared up
First by the place's alcohol washes to be brazed of stainless steel pipe after tining and dry up, then tining surface smear one layer it is micro-
Active brazing flux；
(2) aluminium alloy flange disk molten tin bath surface is cleared up.
First the anodization material on the aluminium alloy flange disk molten tin bath surface after anodization is scraped off, then with alcohol washes ring flange
And it dries up.
(3) it heats
Soldering oven is heated to 85~95 DEG C of sections, keeps the temperature 1 hour, then cleaned ring flange is put into electric furnace and is added
Heat is taken out from electric furnace after brazing filler metal melts, then scrapes off the solder that ring flange molten tin bath inner surface portion is aoxidized by heating.
(4) welding equipment
It by the centre bore of mandrel insertion ring flange, is oriented to mandrel, then bellows is inserted into molten tin annular groove through mandrel, it is suitable
Hour hands rotate 2-3 circle, then rotate counterclockwise 2-3 circle, add solder, brazing flux as needed therebetween, after waiting solders to solidify, then wipe pricker
Agent.
(5) it cleans
The product being brazed is put into after being cleaned in 50~60 DEG C of flowing hot waters, drying.
Further to understand remaining oxide and water stain, progress alcohol immersion and cleaning after hot water cleaning, drying.
Inspection cleaning is carried out to residual brazing flux at solder joint with rigid plastics cleaning tool cooperation reflecting mirror, then using curved
Silk is wrapped at circular welding wire and dips alcohol, and brazed seam is further cleared up, does not remain pricker until visually observing
Until agent, drying.
(6) airtight experiment
Prepare air seal test fixture, and clean with alcohol washes.
Subassembly product after steel/aluminum dissimilar metal soldering is fitted into air seal test fixture, length is guaranteed by tooling, is prevented
Deformation of products.
It is passed through the air of 0.6MPa to inner cavity, sub-assembly is put into alcohol, is kept for 5 minutes, does not allow to leak.
Vent valve is opened, after abundant release, dismounting fixture with alcohol washes subassembly product and is dried up.
(7) CT examination
Product is subjected to CT scan imaging inspection to weld seam with industrial CT system, do not allow there are overproof stomata,
The defects of slag inclusion, incomplete fusion.
(8) endoscope detecting
Product is subjected to endoscope detecting, does not allow to there are the attachments such as remaining brazing flux.
Embodiment 2: aluminium alloy flange disk trench inner diameter Φ 320mm steel/aluminum dissimilar metal is brazed attachment method.
(1) stainless steel pipe surface is cleared up
First by the place's alcohol washes to be brazed of stainless steel pipe after tining and dry up, then tining surface smear one layer it is micro-
Active brazing flux；
(2) aluminium alloy flange disk molten tin bath surface is cleared up.
First aluminium alloy flange disk molten tin bath surface after anodization being scraped off containing anodization material, then with alcohol washes method
Blue disk simultaneously dries up.
(3) it heats
Soldering oven is heated to 85~95 DEG C of sections, keeps the temperature 1 hour, then cleaned ring flange is put into electric furnace and is added
Heat is taken out from electric furnace after brazing filler metal melts, then scrapes off the solder that ring flange molten tin bath inner surface portion is aoxidized by heating.
(4) welding equipment
It by the centre bore of mandrel insertion ring flange, is oriented to mandrel, then bellows is inserted into molten tin annular groove through mandrel, it is suitable
Hour hands rotate 2-3 circle, then rotate counterclockwise 2-3 circle, add solder, brazing flux as needed therebetween, after waiting solders to solidify, then wipe pricker
Agent.
(5) it cleans
The product being brazed is put into after being cleaned in 50~60 DEG C of flowing hot waters, drying.
Further to understand remaining oxide and water stain, progress alcohol immersion and cleaning after hot water cleaning, drying.
Inspection cleaning is carried out to residual brazing flux at solder joint with rigid plastics cleaning tool cooperation reflecting mirror, then using curved
Silk is wrapped at circular welding wire and dips alcohol, and brazed seam is further cleared up, does not remain pricker until visually observing
Until agent, drying.
(6) airtight experiment
Prepare air seal test fixture, and clean with alcohol washes.
Subassembly product after steel/aluminum dissimilar metal soldering is fitted into air seal test fixture, length is guaranteed by tooling, is prevented
Deformation of products.
It is passed through the air of 0.6MPa to inner cavity, sub-assembly is put into alcohol, is kept for 5 minutes, does not allow to leak.
Vent valve is opened, after abundant release, dismounting fixture with alcohol washes subassembly product and is dried up.
(7) CT examination
Product is subjected to CT scan imaging inspection to weld seam with industrial CT system, do not allow there are overproof stomata,
The defects of slag inclusion, incomplete fusion.
(8) endoscope detecting
Product is subjected to endoscope detecting, does not allow to there are the attachments such as remaining brazing flux.
The above, optimal specific embodiment only of the invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.
Claims (23)
1. a kind of stainless steel/aluminium alloy heterogenous metal brazing attachment method, which is characterized in that steps are as follows:
(1) blast, zinc-plated, copper plating treatment are carried out to the molten tin bath of Al alloy parts；To the molten tin bath tin filling of Al alloy parts, then carry out
Whole anodization；
(2) stainless steel pipe surface is cleared up；
(3) the Al alloy parts molten tin bath surface after anodization is cleared up；
(4) Al alloy parts are put into soldering oven and are heated to brazing filler metal melts and take out；
(5) stainless steel pipe is packed into molten tin bath, solidified to solder；
(6) it is cleaned.
2. stainless steel as described in claim 1/aluminium alloy heterogenous metal brazing attachment method, which is characterized in that cleaning is stainless
Steel pipe fitting surface includes: by the place's alcohol washes to be brazed of stainless steel pipe after tining and to dry up, and is then smeared on tining surface
One layer of micro- active brazing flux.
3. stainless steel as claimed in claim 2/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: described is micro-
Active brazing flux is liquid tin.
4. stainless steel as described in claim 1/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: in step (3)
It includes: first to scrape the anodization material on the Al alloy parts molten tin bath surface after anodization that Al alloy parts molten tin bath surface, which carries out cleaning,
It goes, then with alcohol washes Al alloy parts and dries up.
5. stainless steel as described in claim 1/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: in step (4)
Al alloy parts are put into be heated in soldering oven brazing filler metal melts and take out method particularly includes: soldering oven is heated to 85~95
DEG C, 1 hour is kept the temperature, then Al alloy parts are put into electric furnace and are heated, after brazing filler metal melts, are taken out from electric furnace, then scrape off
The solder that Al alloy parts molten tin bath inner surface portion is aoxidized by heating.
6. stainless steel as described in claim 1/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: in step (5)
Further include rotating clockwise 2-3 circle, then rotate counterclockwise 2-3 circle by stainless steel pipe loading molten tin bath, adds pricker as needed therebetween
Material, brazing flux guarantee that welding angle is full.
7. stainless steel as described in claim 1/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: in step (6)
Carrying out cleaning includes:
6.1 are put into drying in 50~60 DEG C of flowing hot waters after cleaning；
6.2 are put into alcohol and impregnate, clean and dry up；
6.3 carry out brazed seam cleaning by the way of mechanical, until visually observation is without residual brazing flux.
8. stainless steel as claimed in claim 7/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: using mechanical
Mode to carry out brazed seam cleaning include: to be covered using curving package silk outside circular rigid welding wire and dipping alcohol not
Brazed seam is cleared up in outside in rust steel pipe fitting.
9. stainless steel as described in claim 1/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: further include step
Suddenly (7), the subassembly product after soldering carry out air-tight test, do not allow to leak at brazed seam.
10. stainless steel as claimed in claim 9/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: further include step
Suddenly (8) carry out CT scan imaging inspection to weld seam, do not allow that there are overproof stomata, slag inclusion or incomplete fusions at brazed seam.
11. stainless steel as claimed in claim 10/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: further include
Step (9) carries out endoscope detecting, does not allow to have remaining brazing flux at brazed seam.
12. stainless steel as described in claim 4 or 5/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: step
(1) blast described in includes the following steps:
A. the cleaning of aluminium alloy flange panel surface, inspection；
B. positioner clamping Al alloy parts are used, positioner inclination angle theta is set；Positioner revolving speed is adjusted, so that Al alloy parts
Constant linear velocity needed for blast face is kept；Spray gun blast straight down；
C. the posture for adjusting positioner completes the blast of molten tin bath inner surface；
D. visual examination is carried out to blast face, if the requirements are not met then blast again.
13. stainless steel as claimed in claim 12/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: in step c
The posture of adjustment positioner completes the blast of narrow deep trouth inner surface, comprising: positioner rotates horizontally respectively completes tin bath bottom blowing
Sand, inward slant θ simultaneously rotate, and complete the blast of molten tin bath inner groove surface, are inclined outwardly θ and rotate, and complete the blast of molten tin bath outer well surface.
14. stainless steel as described in claim 4 or 5/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: step
(1) zinc-plated described in includes the following steps:
A. Al alloy parts are processed by shot blasting using chemical polishing solution；
B. caustic corrosion is carried out to Al alloy parts and cleaned；
C. light is carried out out to Al alloy parts and cleaned；
D. zinc is soaked for the first time, and is cleaned；
E. zinc is soaked again, and is cleaned.
15. stainless steel as claimed in claim 14/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: in step d
First leaching zinc method are as follows: 60~80s is impregnated in 30~40 DEG C of zinc dipping solutions, until the molten tin bath production of Al alloy parts is uniform
Dark grey film.
16. stainless steel as claimed in claim 15/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: in step e
Zinc method is soaked again are as follows: zinc bath controls temperature using heating water bath mode, 60~70s is impregnated in 30~40 DEG C of solution, directly
Molten tin bath to Al alloy parts generates uniform lark film.
17. stainless steel as described in claim 4 or 5/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: step
(1) copper facing described in includes the following steps:
One, a copper facing
1.1 by complete it is zinc-plated after Al alloy parts molten tin bath using copper facing tank liquor carry out dash current copper facing, single aluminium alloy
Workpiece current strength is 80~110A/dm2；
The 1.2 molten tin bath copper facing using copper facing tank liquor to Al alloy parts, single part current strength are 15~30A/dm2；
1.3 cleaning aluminum alloy workpiece；
Two, secondary copper facing
2.1 carry out dash current copper facing using copper facing tank liquor, and single part current strength is 50~70A/dm2；
The 2.2 molten tin bath copper facing using copper facing tank liquor to Al alloy parts, single part current strength are 10~20A/dm2
2.3 cleaning aluminum alloy workpiece simultaneously dry up.
18. stainless steel as claimed in claim 17/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: after zinc-plated
A copper facing is carried out in 1.5min.
19. stainless steel as claimed in claim 18/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: step 1.1
When middle progress dash current copper facing, copper facing tank liquor temperature is 15~40 DEG C, 2~4min of electroplating time, in impact process, aluminium alloy
Workpiece is moved back and forth and is circumferentially rotated；Copper facing tank liquor specific side copper-plated to the molten tin bath of Al alloy parts is used in step 1.2
Method are as follows: copper facing tank liquor temperature is 15~40 DEG C, and 2~4min of electroplating time, Al alloy parts are moved back and forth and circumferentially rotated.
20. stainless steel as claimed in claim 19/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: step 1.2
It is less than 2min to the time interval that step 2.1 starts after the completion.
21. stainless steel as claimed in claim 20/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: step 2.1
It is middle that dash current copper facing is carried out using copper facing tank liquor method particularly includes: 15~35 DEG C of copper facing tank liquor temperature, electroplating time 2~
4min, in impact process, Al alloy parts are moved back and forth and are circumferentially rotated；Using copper facing tank liquor to aluminium alloy in step 2.2
The narrow deep trouth of ring flange is copper-plated method particularly includes: and 15~40 DEG C of copper facing tank liquor temperature, 7~9min of electroplating time, in impact process,
Al alloy parts are moved back and forth and are circumferentially rotated.
22. stainless steel as claimed in claim 21/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: described
Once, secondary copper-plated tank liquor is copper cyanide solution.
23. stainless steel as described in claim 1/aluminium alloy heterogenous metal brazing attachment method, it is characterised in that: the molten tin bath
For annular groove, groove depth is 15~25mm, and groove width is 3~10mm.
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