CN107866617A - A kind of wide-gap brazing metal dust fill method - Google Patents
A kind of wide-gap brazing metal dust fill method Download PDFInfo
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- CN107866617A CN107866617A CN201610842139.XA CN201610842139A CN107866617A CN 107866617 A CN107866617 A CN 107866617A CN 201610842139 A CN201610842139 A CN 201610842139A CN 107866617 A CN107866617 A CN 107866617A
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- filling
- low
- gap
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- metal dust
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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
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
A kind of wide-gap brazing metal dust fill method, is characterized in that：From chemical composition and matrix phase with or similar metal dust filling joint clearance of brazing, the filling mode in the gap is point three layers of filling, three layers are filled with bottom filling and intermediate layer filling and upper strata filling, low-melting component content in bottom powder filler is 0%~15%, low-melting component content in the powder filler of intermediate layer is 20%~40%, low-melting component content in the powder filler of upper strata is 80%~100%, bottom powder filler accounting is not less than 50%, intermediate layer powder filler accounting is not higher than 37.5%, and upper strata powder filler accounting is not higher than 25%；Using the technical scheme, the liquid low-melting component from upper strata flows to bottom in brazing process, so that high melting point component particle is reset, small solid phase particles are dissolved in liquid phase and separated out again with small grains after saturation is reached, and realize that the amount of liquid phase needed for joint densification is less.
Description
Technical field
The present invention relates to aeronautical material to process welding direction technical field, specifically a kind of wide-gap brazing metal
Powder filling method.
Background technology
Conventional soldering is liquid solder is flowed into and is rested in play movement using capillarity, and gap length is to pricker
Material filling and joint performance have vital influence, therefore require that joint clearance of brazing have to be lower than during component assembly before weldering
0.15mm, in the range of generally remaining in 0.04~0.08mm.But for complicated and be difficult to mach Ni-based cast
High temperature alloy and cobalt base superalloy part, to ensure such fit-up gap in manufacture and reparation is extremely difficult, spy
It is not the difficult weldering high temperature alloy part for being scrapped by cracking, due to the oxide-film that crack surfaces generation is fine and close, solder is difficult to
Wetting and spreading.Crackle cleaning uses mechanical rubbing method, and the gap after cleaning is typically larger than 1mm, and gap is without capillarity, melting
Solder can not be stopped and fill gap, therefore the cast superalloy part of difficult weldering must be welded using wide-gap brazing method
Connect reparation.
In the case that wide-gap brazing refers to be more than 1mm in joint clearance of brazing, conventional capillarity can not be realized, by
Preset soldering packing material in gap, and it is thermally formed under conditions of less than matrix melts temperature one kind of fine and close metallurgical binding
Welding method.Wide-gap brazing packing material is generally made up of two parts：A part is the relatively low alloy powder of fusing point, claims eutectic
Point component, i.e., conventional solder；Another part is the higher alloy powder of fusing point, claims high melting point component.Filled under brazing temperature
High melting point component in material is non-fusible but solidification sintering occurs, therefore big joint clearance of brazing is bridged as with capillarity
Small joint clearance of brazing.The low-melting component in packing material melts under brazing temperature simultaneously forms liquid phase, soaks and fills solid-state
Gap between mother metal and high-melting-point powder, ultimately form fine and close metallurgical binding.
Because the low-melting component in wide-gap brazing packing material usually contains the melting point depressants such as B, Si, in brazed seam easily
Form brittle intermetallic compound phase.And quantity, size, pattern and the distribution of compound directly determine the strong of soldered fitting
Degree and plasticity.Therefore the ratio of low-melting component and high melting point component in wide-gap brazing packing material how is optimized, so as to control
Frangible compounds in joint processed are distributed and improve joint mechanical property, are the keys that wide-gap brazing repairs success.
Gap filling mode in the prior art is usually filling, Gao Rong after high-melting-point and the mixing of low-melting component powder
Point component and the mode of low-melting component layering filling, but this method when applied to deep narrow crack forming mechanism with certain limitation
Property.
On powder filling mode, existing wide-gap brazing technology generally use high melting point component and low-melting component mix
The mode of conjunction forms paste filler, fills joint clearance of brazing afterwards, as shown in Figure 1；To avoid because of local low-melting component content not
Joint is caused to form loose and hole defect enough, in powder accounting, low-melting component content is usually less than 50%；But
Due to the introducing of a large amount of low-melting components, the nonmetalloid content such as B, Si is significantly higher than matrix in wide-gap brazing joint,
Larger-size block or chain frangible compounds are formed in joint, is also difficult to eliminate even if long-time heat preservation diffusion, finally leads
Joint mechanical property is caused to be substantially less than matrix.
To improve joint mechanical property, the content of low-melting component in powder filler should be reduced as far as possible, but in eutectic
Point constituent content it is less under conditions of, because powder filler specific surface area is big, liquid low-melting component in the presence of capillary force,
Preferentially wetting and spreading and powder filler is set to occur to reunite and shrink between high-melting-point powder particle, finally because matrix and powder filler are received
Contract inconsistent and cause to form larger gap in powder and basal body interface, form the non-soldering defect in interface.
The content of the invention
The purpose of the present invention is exactly to solve problem present in above technology, and a kind of wide-gap brazing gold is provided for this
Belong to powder filling method.
A kind of wide-gap brazing metal dust fill method, from chemical composition and matrix phase with or similar metal powder
End filling joint clearance of brazing, the filling mode in the gap is point three layers of filling.
Further, three layers are filled with bottom filling and intermediate layer filling and upper strata filling.
Further, the low-melting component content in bottom powder filler is 0%~15%, low in the powder filler of intermediate layer
Melting point component content is 20%~40%, and the low-melting component content in the powder filler of upper strata is 80%~100%.
Further, the low-melting component content in bottom powder filler is 10%, the low melting point in the powder filler of intermediate layer
Constituent content is 30%, and the low-melting component content in the powder filler of upper strata is 90%.
Further, bottom powder filler accounting is not less than 50%, and intermediate layer powder filler accounting is not higher than 37.5%, upper strata
Powder filler accounting is not higher than 25%.
Further, bottom filling and the accounting of intermediate layer filling and upper strata filling are respectively 3:2:1.
Further, the content of low-melting component in each level powder filler ratio and different levels is adjusted, makes entirely to connect
Low-melting component content is maintained at 25%~35% in head.
Further, low-melting component content is maintained at 30% in whole joint.
Further, joint clearance of brazing is filled from the chemical composition metal dust different from matrix.
Advantages of the present invention：
1, in brazing process, because bottom filling metal dust is free of or contains low-melting component less, the liquid from upper strata is low
Melting point component flows to bottom, on the one hand high melting point component particle is reset, and intergranular space reduces, on the other hand small
Solid phase particles be dissolved in liquid phase and separated out again with small grains after saturation is reached, therefore realize joint densification needed for
Amount of liquid phase is less；
2, the presence of liquid phase provides a fast diffusion path to improve joint mass transfer speed, and by means of powder particle
The characteristics of specific surface area is big so that faster, required time is shorter for the speed of joint diffusion-homogenization, and is filled in the powder filler of upper strata
The liquid low-melting component of foot provides guarantee for the densification filling of bottom, effectively eliminates the weld defects such as loose and hole；
3, the reduction of low melting point powder dosage, can significantly shorten wide-gap brazing joint diffusion-homogenization in wide-gap brazing joint
Time simultaneously improves joint mechanical property.
Brief description of the drawings
Fig. 1 is to fill joint clearance of brazing principle simplified schematic diagram in the prior art；
Fig. 2 is the filling joint clearance of brazing principle simplified schematic diagram of the present invention.
Specific embodiment
In order that the present invention is easier to be understood, below in conjunction with accompanying drawing and embodiment to technical scheme
It is described in detail.
Embodiment 1
As shown in Fig. 2 a kind of wide-gap brazing metal dust fill method, same or similar with matrix phase from chemical composition
Metal dust fills joint clearance of brazing, and the filling mode in the gap is point three layers of filling, and three layers are filled with bottom filling 1 and intermediate layer
Filling 2 and upper strata filling 3, the low-melting component content that bottom fills in 1 powder are 0%, and the eutectic in 2 powder is filled in intermediate layer
Point constituent content is 20%%, and the low-melting component content that upper strata fills in 3 powder is 80%, bottom filling 1 and intermediate layer filling 2
And the accounting of upper strata filling 3 is respectively 2:1:1, by adjusting low melting point group in each level powder filler ratio and different levels
The content divided, makes low-melting component content in whole joint be maintained at 25%.
Embodiment 2
As shown in Fig. 2 a kind of wide-gap brazing metal dust fill method, part material are cast nickel-base alloy, its
Face crack forms the V-groove that maximal clearance is 2.0mm after mechanical grinding is cleared up, when carrying out wide-gap brazing reparation,
From chemical composition and matrix phase with or similar metal dust filling joint clearance of brazing, the filling mode in the gap filled out for points three layers
Fill, three layers are filled with bottom filling 1 and intermediate layer filling 2 and upper strata filling 3, and the low-melting component that bottom is filled in 1 powder contains
Measure as 10%, the 2 low-melting component contents filled in powder are filled out as 30% in intermediate layer, and the low-melting component that upper strata is filled in 3 powder contains
Measure as 90%, bottom fills 1 powder accounting and is not less than 50%, and intermediate layer fills 2 powder accountings and is not higher than 37.5%, and 3 powder are filled on upper strata
Last accounting is not higher than 25%, and bottom filling 1 and the accounting of intermediate layer filling 2 and upper strata filling 3 are respectively 3:2:1, it is each by adjusting
The content of low-melting component in level powder filler ratio and different levels, while wide-gap brazing manufacturability is ensured,
While ensureing wide-gap brazing manufacturability, low-melting component content in whole joint is set to be maintained at 30%, between reducing greatly
The content of the melting point depressant such as B, Si in gap soldered fitting, lead solder joint microstructure is fine and close, along crystal boundary without continuous big block compound phase
Separate out, significantly improve joint mechanical property.
Embodiment 3
As shown in Fig. 2 a kind of wide-gap brazing metal dust fill method, same or similar with matrix phase from chemical composition
Metal dust fills joint clearance of brazing, the chemical composition metal dust filling joint clearance of brazing dramatically different with matrix also can be selected, such as
Cobalt-base alloys part gap filling Co-based alloy powder can also meet requirement, and the filling mode in the gap is filled out to divide three layers
Fill, three layers are filled with bottom filling 1 and intermediate layer filling 2 and upper strata filling 3, and the low-melting component that bottom is filled in 1 powder contains
Measure as 15%, the 2 low-melting component contents filled in powder are filled out as 40% in intermediate layer, and the low-melting component that upper strata is filled in 3 powder contains
Measure as 100%, bottom filling 1 and the accounting of intermediate layer filling 2 and upper strata filling 3 are respectively 4:3:1, filled out by adjusting each level
The content of low-melting component in powder proportions and different levels is filled, while wide-gap brazing manufacturability is ensured, is being ensured greatly
While the brazing manufacturability of gap, low-melting component content in whole joint is set to be maintained at 35%, so as to reduce wide-gap brazing
The content of the melting point depressant such as B, Si in joint.
Claims (9)
- A kind of 1. wide-gap brazing metal dust fill method, it is characterised in that：It is same or near from chemical composition and matrix phase Metal dust filling joint clearance of brazing, the filling mode in the gap is point three layers of filling.
- A kind of 2. wide-gap brazing metal dust fill method according to claim 1, it is characterised in that：Three layers of filling For bottom filling and intermediate layer filling and upper strata filling.
- A kind of 3. wide-gap brazing metal dust fill method according to claim 2, it is characterised in that：Bottom is filled Low-melting component content in powder is 0%~15%, and the low-melting component content in the powder filler of intermediate layer is 20%~40%, on Low-melting component content in layer powder filler is 80%~100%.
- A kind of 4. wide-gap brazing metal dust fill method according to claim 2, it is characterised in that：Bottom is filled Low-melting component content in powder is 10%, and the low-melting component content in the powder filler of intermediate layer is 30%, upper strata filling powder Low-melting component content in end is 90%.
- A kind of 5. wide-gap brazing metal dust fill method according to claim 2, it is characterised in that：Bottom is filled Powder accounting is not less than 50%, and intermediate layer powder filler accounting is not higher than 37.5%, and upper strata powder filler accounting is not higher than 25%.
- A kind of 6. wide-gap brazing metal dust fill method according to claim 2, it is characterised in that：Bottom is filled Accounting with intermediate layer filling and upper strata filling is respectively 3:2:1.
- A kind of 7. wide-gap brazing metal dust fill method according to claim 3, it is characterised in that：Adjust each layer The content of low-melting component, is maintained at low-melting component content in whole joint in level powder filler ratio and different levels 25%~35%.
- A kind of 8. wide-gap brazing metal dust fill method according to claim 7, it is characterised in that：Whole joint Middle low-melting component content is maintained at 30%.
- A kind of 9. wide-gap brazing metal dust fill method according to claim 1, it is characterised in that：Fill soldering Gap is from the chemical composition metal dust different from matrix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610842139.XA CN107866617B (en) | 2016-09-23 | 2016-09-23 | Metal powder filling method for large-gap brazing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610842139.XA CN107866617B (en) | 2016-09-23 | 2016-09-23 | Metal powder filling method for large-gap brazing |
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| CN107866617A true CN107866617A (en) | 2018-04-03 |
| CN107866617B CN107866617B (en) | 2020-03-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112440026A (en) * | 2020-11-10 | 2021-03-05 | 鄂尔多斯市特种设备检验所 | Modified austenitic stainless steel surfacing welding electrode and preparation method thereof |
| US20230108587A1 (en) * | 2021-10-04 | 2023-04-06 | General Electric Company | Backwall strike braze repair |
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| US20090159645A1 (en) * | 2007-12-21 | 2009-06-25 | Laurent Cretegny | Brazing alloy compositions and methods |
| CN202479714U (en) * | 2012-03-27 | 2012-10-10 | 郑州机械研究所 | Grain filling composite electrode suitable for wide-gap brazing |
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| CN103862145A (en) * | 2014-03-07 | 2014-06-18 | 中国石油大学(华东) | Butt welding method of pipeline lined with coating |
| CN204686295U (en) * | 2015-05-25 | 2015-10-07 | 郑州机械研究所 | Metal-cored composite silver solder |
| CN105728877A (en) * | 2016-03-15 | 2016-07-06 | 西安航空制动科技有限公司 | Method for repairing torsional cylinder by laser welding |
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| US6520401B1 (en) * | 2001-09-06 | 2003-02-18 | Sermatech International, Inc. | Diffusion bonding of gaps |
| US20090159645A1 (en) * | 2007-12-21 | 2009-06-25 | Laurent Cretegny | Brazing alloy compositions and methods |
| CN103052466A (en) * | 2010-08-02 | 2013-04-17 | 斯奈克玛 | Composite powder for assembling or resurfacing of parts made of superalloy by diffusion welding |
| CN202479714U (en) * | 2012-03-27 | 2012-10-10 | 郑州机械研究所 | Grain filling composite electrode suitable for wide-gap brazing |
| CN103551794A (en) * | 2013-10-21 | 2014-02-05 | 中国科学院金属研究所 | High temperature alloy hot end part large gap defect transient state liquid phase infiltration repairing method |
| CN103862145A (en) * | 2014-03-07 | 2014-06-18 | 中国石油大学(华东) | Butt welding method of pipeline lined with coating |
| CN204686295U (en) * | 2015-05-25 | 2015-10-07 | 郑州机械研究所 | Metal-cored composite silver solder |
| CN105728877A (en) * | 2016-03-15 | 2016-07-06 | 西安航空制动科技有限公司 | Method for repairing torsional cylinder by laser welding |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112440026A (en) * | 2020-11-10 | 2021-03-05 | 鄂尔多斯市特种设备检验所 | Modified austenitic stainless steel surfacing welding electrode and preparation method thereof |
| CN112440026B (en) * | 2020-11-10 | 2022-05-10 | 鄂尔多斯市特种设备检验所 | Modified austenitic stainless steel surfacing welding electrode and preparation method thereof |
| US20230108587A1 (en) * | 2021-10-04 | 2023-04-06 | General Electric Company | Backwall strike braze repair |
| US11951557B2 (en) * | 2021-10-04 | 2024-04-09 | General Electric Company | Backwall strike braze repair |
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| CN107866617B (en) | 2020-03-17 |
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Address after: 100024 Beijing city Chaoyang District eight Bridge North East Junzhuang No. 1 Applicant after: China Institute of Aeronautical Manufacturing Technology Address before: 100024 Beijing city Chaoyang District eight Bridge North East Junzhuang No. 1 Applicant before: Beijing Aviation Manufacturing Engineering Institute of China Aviation Industry Group Company |
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