CN100453236C - Micro-area Repair Welding Method for Aluminum Alloy Defects - Google Patents
Micro-area Repair Welding Method for Aluminum Alloy Defects Download PDFInfo
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- CN100453236C CN100453236C CNB2006101612937A CN200610161293A CN100453236C CN 100453236 C CN100453236 C CN 100453236C CN B2006101612937 A CNB2006101612937 A CN B2006101612937A CN 200610161293 A CN200610161293 A CN 200610161293A CN 100453236 C CN100453236 C CN 100453236C
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- 238000003466 welding Methods 0.000 title claims abstract description 78
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 26
- 230000008439 repair process Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000007547 defect Effects 0.000 title claims abstract description 16
- 238000005219 brazing Methods 0.000 claims abstract description 9
- 238000005476 soldering Methods 0.000 claims description 39
- 230000002950 deficient Effects 0.000 claims description 19
- 229910000679 solder Inorganic materials 0.000 claims description 11
- 238000010891 electric arc Methods 0.000 claims description 10
- 230000003750 conditioning effect Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 238000005238 degreasing Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 239000002184 metal Substances 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000004411 aluminium Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- NGONBPOYDYSZDR-UHFFFAOYSA-N [Ar].[W] Chemical compound [Ar].[W] NGONBPOYDYSZDR-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Arc Welding In General (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a micro-area repair welding method for aluminum alloy defects, which comprises the following process steps: determining the position of the defect; performing pre-welding finishing on the welding repair area; carrying out oil removal and degreasing treatment on the welding area; micro-area welding is carried out on the welding area by a pulse energy micro-area welding machine; carrying out postweld finishing on the welding area; detecting leakage of the workpiece and confirming the welding repair quality; and if leakage exists after welding repair, repeating the steps B to F until no leakage exists. Meanwhile, the invention also discloses a pulse energy micro-area welding machine used for implementing the method. For the defects of the aluminum alloy base material, the method can repair the defects without influencing the size of the base material; for the leakage position of the aluminum alloy brazing seam, after the leakage position is repaired by the technology, the requirement of sealing performance is met under the condition that the performance of the welding seam and the size of a workpiece are not influenced.
Description
Technical field
The present invention relates to a kind of method that can carry out the micro-zone repair welding that sealing repairs to aluminium alloy mother metal and aluminium alloy brazed seam defective, belong to welding method class technical field in the forming technique.
Background technology
The miniaturization of radar, lightweight make that the application of aluminium alloy is very extensive, and many high accuracy complex parts all adopt aluminum alloy materials, because workpiece weld seam complexity, dimensional requirement is very high, all can only adopt soldering processes to carry out sealing and connect.But because workpiece is complex-shaped, therefore solder joint can't not leak by 100% assurance solder joint than characteristics such as length; Though it is good to have welded back weld seam compactness simultaneously, because follow-up inevitable existence destroys the technological process of weld seam, as electric conductive oxidation, machined etc. all may make the good workpiece of original air-tightness leakage phenomenon occur.If adopt secondary soldering soldering, weldquality is difficult to be protected, and the low and workpiece size that some goes wrong of the brazed seam defective success rate of soldering part puts in place, can't carry out secondary soldering mending-leakage once more; Technological measure that adopt to mend glue guarantees that there is the quality and reliability hidden danger of weatherability, durability in the member air-tightness, thus need that research is easy to operate, accessibility preferably process for welding repair satisfy the requirement of sealing property, with the quality of raising product.
Low energy densities welding method such as argon tungsten-arc welding in the prior art, arc energy density is low, and firing rate is slow, when being used for the brazed seam repair welding, not only make the mother metal fusing in soldering district, and the brazed seam beyond the meeting refuse soldering zone, the risk of new brazed seam defective being introduced is arranged.Same reason makes argon tungsten-arc welding, during less than the workpiece of 1mm, is difficult to the size of control welding pool at the soldering wall thickness, very easily burns down and burns workpiece; Thicker or radiating condition during the zone, must adopt very big welding current and long heat time heating time to melt by workpiece preferably at the soldering wall thickness; Moreover this method post welding distortion is big, will influence the dimensional accuracy of workpiece after the soldering, this shows, the argon arc welding of tungsten plate can not be satisfied the requirement of the local microcell soldering of brazed seam defective.
Variable Polarity plasma welding in the prior art is the improved form of argon tungsten-arc welding, be compression arc, its energy density is more much higher than the free electric arc of tungsten argon arc, when identical energy is imported, the fusion penetration of weld seam is dark, and the heat affected area is little, but when being used for the brazed seam soldering, still there is problems such as making the brazed seam refuse in addition of soldering district, the difficult control in molten bath.
Gas metal-arc welding in the prior art; its electric arc produces between welding wire and workpiece; and the physics of aluminium alloy; the chemical property uniqueness; thermal conductivity; specific heat; the fusing potentiality is very big; as thermal conductivity is 225.3W/M.K; be twice many than steel; it is inner and lose that a large amount of arc energies is passed to parent metal rapidly during welding; easily form defectives such as incomplete fusion; especially be in defectives such as easier generation incomplete fusion of cold conditions and pore at striking place mother metal; the defective of brazed seam is generally all smaller, exactly is in the striking section during with the gas metal-arc welding soldering, so the improper soldering brazed seam defective that is used for of gas metal-arc welding.
Laser Welding in the prior art and electron beam welding all belong to the high energy beam weldering, but aluminium alloy is lower to the absorptivity of laser, welding aluminum alloy needs bigger power, the high power laser welding gun is bigger because of its volumes of reason such as need water-cooleds, the accessibility and the flexibility of operation are bad, and the brazed seam defective may be created in any position of workpiece, so Laser Welding can only solve a part of brazing defect, and is just powerless to the defective that the position is relatively more awkward.Electron beam welding carries out in vacuum chamber, and its visuality, accessibility and flexibility are poorer than Laser Welding, more is unsuitable for the soldering of aluminium brazed seam.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, providing a kind of can carry out the welding technique that sealing is repaired to aluminum alloy defect and aluminium alloy brazing seam defect.
Concrete thinking of the present invention is, adopt pulse energy microregion welding machine, this equipment is with the non-contacting mode electric arc that ignites, supply with electric arc by the energy that the energy controller abrupt release is stored in wherein, produce an accurately control of energy size, the very large pulsed arc of energy density adds the thermosetting molten bath to the microcell of welded piece, heats welding wire as electrode simultaneously and forms the droplet transfer form solder joint in the molten bath.
Micro-zone repair welding method for aluminum alloy defect of the present invention, its processing step is:
1, checks workpiece, determine defective locations;
2, preceding finishing is welded in the soldering district;
3, the soldering district is carried out the oil removing ungrease treatment;
4, carry out soldering with pulse energy microregion welding machine in the soldering district; Pulse energy microregion welding machine, with the non-contacting mode electric arc that ignites, the energy that is stored in wherein by the energy controller abrupt release forms the accurately control of energy size, the pulsed arc that density is very big, microcell to brazing defect adds the thermosetting molten bath, and the welding wire formation droplet transfer of heating simultaneously as electrode forms solder joint in the molten bath;
5, the soldering district is carried out the postwelding finishing;
6, workpiece is hunted leak, confirm quality of welding repair;
7, if also have seepage after the soldering, then repeating step 2 to 6, up to not till seepage.
For the aluminum alloy defect place, directly welding gun is aimed at the welding position, welding wire and workpiece maintain a certain distance, and moment is finished the welding to defective locations, if this defective is bigger, then can adopt multiple spot welding to finish accumulation to fault location; For aluminium alloy brazing seam leakage place, first trimming leak is then aimed at this leak and is carried out the argon arc spot welding mending-leakage, controls the shaping of solder joint by regulating weldingvoltage, thereby satisfies the solder joint sealing requirements.
Pulse energy microregion welding machine of the present invention is made of step-down rectifying circuit 1, energy controller 2, striking device 3, signal conditioning circuit 4, sample circuit 5, A/D change-over circuit 6, input and display circuit 7, single-chip microcomputer 8, I/O circuit 9, photoelectric isolating circuit 10 and power driving circuit 11; The output of step-down rectifying circuit 1 connects the input of energy controller 2, the output of energy controller 2 connects the input of striking device 3, the input of sample circuit 5 connects step-down rectifying circuit 1 and striking device 3, the output of striking device 3 and sample circuit 5 connects signal conditioning circuit 4 and arrives A/D change-over circuit 6 again, be connected to single-chip microcomputer 8 then, the output of single-chip microcomputer 8 is connected to energy controller 2 through photoelectric isolating circuit 10 and drive circuit 11.
Step-down rectifying circuit 1 offers energy controller 2 with behind the AC rectification, and energy controller 2 is through striking device 3 output Energy Controllable, and the great pulse current of amplitude is supplied with welding arc.The size of energy controller 2 output electric energy is determined jointly that by input circuit 7 and backfeed loop backfeed loop is made up of signal conditioning circuit 4, sample circuit 5 and A/D change-over circuit 6.Single-chip microcomputer is by deciphering input signal, determine the size of control target energy, by target and feedback signal are carried out computing, the result draws difference signal, difference signal generates control signal thus again, this control signal through photoelectric isolating circuit 10 and power driving circuit 11 control energy controllers, realizes the closed-loop control of system again.
The inventive method is the energy density height during because of repair welding, and heat time heating time is short, and welding heat affected zone is little, and postwelding does not have distortion, and flexible operation is visual and accessibility is good, spot size
, solder joint fusion penetration 0.1-3mm can control by setting arc energy, realizes the micro-zone repair welding to aluminium brazed seam defective.For the defective that the aluminium alloy mother metal exists, the present invention can not influence under the size situation of mother metal, repairs good this defective; For aluminium alloy brazing seam leakage place, after repairing by this technology, under the situation that does not influence Weld Performance and workpiece size, satisfy the sealing property requirement.
Description of drawings
Fig. 1, be the circuit structure block diagram of pulse energy microregion welding machine.
The photo of Fig. 2, reparation workpiece
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
Step-down rectifying circuit 1 offers energy controller 2 with behind the AC rectification, and energy controller 2 is through striking device 3 output Energy Controllable, and the great pulse current of amplitude is supplied with welding arc.The size of energy controller 2 output electric energy is determined jointly that by input circuit 7 and backfeed loop backfeed loop is made up of signal conditioning circuit 4, sample circuit 5 and A/D change-over circuit 6.Single-chip microcomputer is by deciphering input signal, determine the size of control target energy, by target and feedback signal are carried out computing, the result draws difference signal, difference signal generates control signal thus again, this control signal through photoelectric isolating circuit 10 and power driving circuit 11 control energy controllers, realizes the closed-loop control of system again.
There are local leakage in embodiment 2, workpiece shown in Figure 2 at the tenon place after the soldering, adopt process of the present invention to repair:
(1) with hydraulic pressure or pneumatic process workpiece is checked, determined defective locations;
(2) according to situations such as defect size positions, to welding preceding finishing in the soldering district;
(3) the soldering district is carried out the oil removing ungrease treatment;
(4) carry out soldering with pulse energy microregion welding machine in the soldering district;
(5) the soldering district is carried out the postwelding finishing;
(6) with hydraulic pressure or pneumatic process workpiece is hunted leak, confirm quality of welding repair;
(7) if also have seepage after the soldering, then repeating step (2) is to (6), up to not till seepage.
Through above-mentioned steps, this workpiece satisfy sealing requirements, and size of workpiece own and performance is not affected after adopting pulse energy microregion welding machine that leak is carried out the argon arc spot welding repairing.
The difference of the present invention and prior art is: apply pulse energy microcell bonding machine reaches the aluminium alloy mother metal Aluminium brazed seam defective is repaired, and pulse energy microregion welding machine adopts energy control method control electric arc, by transferring Electric arc energy control spot size. Compared with the prior art, this technology is only controlled arc energy, does not establish weldering Connect upper current limit, welding current is the very big flash of amplitude, can the microcell of welded piece be added rapidly Heat makes it to form the molten bath, and the welding wire that melts simultaneously as electrode forms molten drop, be transitioned in the molten bath, thereby Produce the microcell metallurgical binding at welded piece, the microcell solder joint zone of influence of formation is little, can not cause solder joint with The refuse of outer qualified brazed seam.
The difference of the present invention and existing welding technology is: aluminium alloy mother metal and aluminium alloy brazed seam micro-zone repair welding skill The energy density height of the existing arc welding electric arc of the arc energy density ratio that art adopts can form small solder joint pair Aluminium alloy and aluminium brazed seam carry out the accurate soldering in part and do not produce any distortion.
The difference of the present invention and prior art is: the prior art post welding distortion is big, can affect the chi of brazing member Very little precision; And aluminium alloy brazed seam micro-zone repair welding technology, the arc discharge time is short, energy density height, therefore weldering Rear distortion is little, can not affect the dimensional accuracy of brazing member.
The difference of the present invention and prior art is: after the prior art soldering, and because the input energy is big, the material crystalline substance Grain strengthens serious, is unsuitable for repeatedly soldering; And aluminium alloy brazed seam micro-zone repair welding technology, the input energy is little, cold But speed is fast, and material grains can not grown up, so if still have seepage defect after the soldering, can repeatedly repeat weldering Mend, and can not affect the dimensional accuracy of qualified brazed seam and workpiece.
Claims (1)
1, a kind of micro-zone repair welding method for aluminum alloy defect, its processing step is:
A, inspection workpiece are determined defective locations;
B, preceding finishing is welded in the soldering district;
C, the soldering district is carried out the oil removing ungrease treatment;
D, carry out soldering in the soldering district with pulse energy microregion welding machine; Pulse energy microregion welding machine, with the non-contacting mode electric arc that ignites, the energy that is stored in wherein by the energy controller abrupt release forms the accurately control of energy size, the pulsed arc that density is very big, microcell to brazing defect adds the thermosetting molten bath, and the welding wire formation droplet transfer of heating simultaneously as electrode forms solder joint in the molten bath;
Described pulse energy microregion welding machine is made of step-down rectifying circuit (1), energy controller (2), striking device (3), signal conditioning circuit (4), sample circuit (5), A/D change-over circuit (6), input and display circuit (7), single-chip microcomputer (8), I/O circuit (9), photoelectric isolating circuit (10) and power driving circuit (11); The output of step-down rectifying circuit (1) connects the input of energy controller (2), the output of energy controller (2) connects the input of striking device (3), the input of sample circuit (5) connects step-down rectifying circuit (1) and striking device (3), the output of striking device (3) and sample circuit (5) connects signal conditioning circuit (4) and arrives A/D change-over circuit (6) again, be connected to single-chip microcomputer (8) then, the output of single-chip microcomputer (8) is connected to energy controller (2) through photoelectric isolating circuit (10) and drive circuit (11);
E, the soldering district is carried out postwelding finishing;
F, workpiece is hunted leak, confirm quality of welding repair;
G, if also have seepage after the soldering, repeating step B to F then is not up to till seepage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101612937A CN100453236C (en) | 2006-12-20 | 2006-12-20 | Micro-area Repair Welding Method for Aluminum Alloy Defects |
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| CNB2006101612937A CN100453236C (en) | 2006-12-20 | 2006-12-20 | Micro-area Repair Welding Method for Aluminum Alloy Defects |
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| CN101011771A CN101011771A (en) | 2007-08-08 |
| CN100453236C true CN100453236C (en) | 2009-01-21 |
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| CN101546943B (en) * | 2008-03-24 | 2012-02-29 | 江苏通达动力科技股份有限公司 | Process for welding repair of motor rotor |
| CN106583883B (en) * | 2017-01-18 | 2019-04-12 | 新兴能源装备股份有限公司 | A kind of thin-wall stainless steel leak hole method for welding |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1157142B1 (en) * | 1999-02-25 | 2002-09-04 | MAN B & W Diesel A/S | Method for producing a wear-resistant surface on components consisting of steel and machine with at least one component of this type |
| US20030106198A1 (en) * | 1999-11-11 | 2003-06-12 | Shear Tool, Inc. | Methods of making wear resistant tooling systems to be used in high temperature casting and molding |
| CN1867418A (en) * | 2003-10-08 | 2006-11-22 | 新日本制铁株式会社 | Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure |
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- 2006-12-20 CN CNB2006101612937A patent/CN100453236C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1157142B1 (en) * | 1999-02-25 | 2002-09-04 | MAN B & W Diesel A/S | Method for producing a wear-resistant surface on components consisting of steel and machine with at least one component of this type |
| US20030106198A1 (en) * | 1999-11-11 | 2003-06-12 | Shear Tool, Inc. | Methods of making wear resistant tooling systems to be used in high temperature casting and molding |
| CN1867418A (en) * | 2003-10-08 | 2006-11-22 | 新日本制铁株式会社 | Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure |
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Address after: No.8 Guorui Road, Yuhuatai District, Nanjing, Jiangsu Province, 210014 Patentee after: CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION NO. 14 Research Institute Address before: 1313 box 03, box 210014, Nanjing City, Jiangsu Province Patentee before: CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION NO. 14 Research Institute |
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