CN114654164A - Electric spark deposition-cold pressure welding composite repairing method - Google Patents
Electric spark deposition-cold pressure welding composite repairing method Download PDFInfo
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- CN114654164A CN114654164A CN202210314342.5A CN202210314342A CN114654164A CN 114654164 A CN114654164 A CN 114654164A CN 202210314342 A CN202210314342 A CN 202210314342A CN 114654164 A CN114654164 A CN 114654164A
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Abstract
The application relates to the field of metal material repairing processes, and particularly discloses an electric spark deposition-cold pressure welding composite repairing method which comprises the following steps: s1, depositing a layer of metal on the surface of the defect of the non-ferrous metal alloy base material by adopting an electric spark deposition process to obtain a deposited metal layer; s2, a vibrating rod is adopted to vertically act on the surface of the deposited metal layer and apply pressure to the deposited metal layer so as to compress the deposited metal layer, the pressure is generated on the partial deposited metal in contact with the deposited metal layer to carry out cold pressure welding, the vibrating rod is moved, and the cold pressure welding is carried out on all the deposited metal layers; and S3, repeating the step S1 and the step S2 until the whole defect part is filled up and 1.0-2.0 mm higher than the surrounding base material, and completing the repair welding. The compactness of the repair metal and the bonding strength between the repair metal and the metal matrix are improved.
Description
Technical Field
The application relates to the technical field of metal material repairing processes, in particular to an electric spark deposition-cold pressure welding composite repairing method which is used for high-reliability repairing of surface defects of an aluminum alloy structural member or a cast aluminum alloy.
Background
The electric spark deposition repair uses capacitive discharge to melt or gasify the electrode material and to transition to the part to be repaired, and the heat input amount of the method is small. However, the bonding strength of the electric spark deposition repair metal and a matrix is extremely low, the structure is loose, and the defects of sand holes and the like exist on the surface of the repair metal, so that the application of the method to the structural part with higher repair requirement is restricted.
Disclosure of Invention
In order to improve the compactness of the repair metal, improve the bonding strength of the repair metal and a metal matrix and meet the defect repair of an aluminum alloy product with higher strength requirement, the application discloses an electric spark deposition-cold pressure welding composite repair method.
The technical scheme is as follows:
an electric spark deposition-cold pressure welding composite repairing method comprises the following steps:
s1, depositing a layer of metal on the surface of the defect of the non-ferrous metal alloy base material by adopting an electric spark deposition process to obtain a deposited metal layer;
s2, vertically acting on the surface of the deposited metal layer by a vibration component and applying a certain pressure to the surface of the deposited metal layer to compress the deposited metal layer, applying pressure to the partial deposited metal in contact with the metal layer to perform cold pressure welding, moving a vibration rod, and performing cold pressure welding to the whole deposited metal layer;
and S3, repeating the step S1 and the step S2 until the whole defect part is filled up and 1.0-2.0 mm higher than the surrounding base material, and completing the repair welding.
Through the technical scheme, after the deposited metal layer is obtained through electric spark deposition, the deposited metal layer is locally extruded by the vibrating rod, the contact area of the end part of the vibrating rod and the deposited metal layer is very small, high-frequency vibration can generate great pressure (pressure) to the vibrating rod, the deposited metal layer can generate enough plastic deformation, the deposited metal layer can be combined with the metal bond of the alloy base material at the atomic distance, the cold pressure welding effect is achieved, the structure densification of the deposited metal layer can be achieved, the mechanical property is greatly improved, and therefore the combination strength between the deposited metal layer and the alloy base material is improved.
The vibration part comprises a conical end part, and the tip position of the conical end part is arranged in an arc shape.
The maximum diameter d of the conical end part is 2.0-5.0 mm, the conical angle alpha is 30-60 degrees, and the tip circular arc r is 0.4-0.6 mm.
The vibrating member may be a vibrating rod, a vibrating mass, or the like.
Preferably, the vibration member is a vibrating rod.
In the repairing method, the end of the vibrating rod is in a cone shape, and the tip of the cone of the vibrating rod is arranged in an arc shape.
In the repairing method, the diameter d of the main body at the end part of the vibrating rod is 2.0-5.0 mm, the taper angle alpha is 30-60 degrees, and the radius r of the arc at the tip is 0.4-0.6 mm.
In the repairing method, the thickness of the deposited metal layer is 1.5-2.5 mm.
In the repairing method, the end part of the vibrating bar is pressed into the deposited metal layer to a depth of 1-2 mm.
In the repairing method, the vibration frequency f of the vibrating rod is 50-100 Hz, the moving speed v of the vibrating rod is 0.5-1.0 mm/s, the vibration power P is 100-350W, and the amplitude A is not less than the depth of the vibrating rod pressed into the deposited metal layer.
In the above repairing method, the vibrating rod needs to move uniformly and slowly while vibrating, and the moving track is as follows: and pressing the vibrating rods into the deposited metal layers in sequence along the linear direction, moving to the linear direction of the next row, and continuously pressing the deposited metal layers, wherein the adjacent pressing points of the vibrating rods need the overlapping area with the pressing point diameter of 1/3-2/3.
Preferably, the neighboring indentation points of the vibrating rod require an overlapping area of half the diameter of the indentation point. So as to ensure that the cold welding effect can be generated in the whole repairing plane.
In the repairing method, the vibrating rod is connected with the electric vibrator, and the electric vibrator can drive the vibrating rod to vibrate. Through the technical scheme, can adopt and hold electric vibrator, the vibrting spear carries out the rapid oscillation according to certain frequency and amplitude along the center pin, under electric vibrator's the effect of vibration force, the vibrting spear tip that the diameter is minimum can produce sufficient pressure to the local deposit metal layer rather than the contact and carry out cold pressure welding, the controllability is good, can conveniently remove repeatedly in whole deposit metal area, thereby make all deposit metal in deposit metal layer area evenly obtain the cold pressure welding effect, the whole each part of deposit metal layer can all have higher bonding strength with the alloy base member, strong adaptability to the defect position, required equipment is simple, can carry out manual operation in a flexible way.
In the repairing method, the non-ferrous metal alloy comprises aluminum alloy and magnesium alloy.
In the repairing method, the electric spark deposition process parameters are as follows: the voltage is 110-130V, the discharge frequency is 300-500 Hz, the electrode rotation speed is 500-600/min, the electrode inclination angle is 30-45 degrees, the electrode diameter is 2.4-3.2 mm, and the Ar gas flow is 15-20L/min.
In the repairing method, after the step S3, the repair welding area is ground and polished.
Specifically, firstly, 300-600 # abrasive paper is adopted to polish a repair welding area until the repair welding area is basically flush with the surface of the base metal, and then 800-1500 # abrasive paper is adopted to polish repair welding metal in sequence.
In summary, the present application at least includes the following beneficial technical effects:
the electric spark deposition repair metal which is singly adopted has extremely low bonding strength with a matrix, loose tissue and the defects of sand holes and the like on the surface of the repair metal, and can not meet the requirement of high-reliability repair. The invention adopts the combination of electric spark deposition and cold pressure welding, arranges the vibrating rod with a certain shape, the deposited metal layer generates enough plastic deformation under a certain pressing depth, the end part of the vibrating rod can carry out cold pressure welding on the local deposited metal layer contacted with the vibrating rod, the controllability is good, and the vibrating rod can conveniently and repeatedly move in the whole deposited metal area, thereby leading all the deposited metals in the area to be uniformly subjected to the cold pressure welding. The structure of the cold-press welding is densified while the cold-press welding is generated, so that the mechanical property can be greatly improved, the compactness of the repair metal and the bonding strength of the repair metal and a metal matrix are improved.
Drawings
FIG. 1 is a schematic structural diagram of a vibrating rod of an electric spark deposition-cold pressure welding composite repairing method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the moving trace of the vibrating rod according to the embodiment of the present invention;
FIG. 3 is a schematic view of an aluminum alloy specimen with pre-defects;
FIG. 4 is a schematic view of the state of the spark-deposited metal;
FIG. 5 is a schematic view of a vibration rod being cold welded;
FIG. 6 is a schematic diagram of the effect of single EDM repair;
fig. 7 shows the electric spark deposition-cold pressure welding composite repairing effect.
Detailed Description
The present application will now be described in further detail with reference to the accompanying figures 1-7 and specific examples:
this example will now be described with reference to the accompanying drawings and examples, wherein the non-ferrous alloy metal substrate is 1420 aluminum lithium alloy material.
Example 1
An electric spark deposition-cold pressure welding composite repairing method, referring to fig. 1-5, comprises the following steps:
1) presetting a defective aluminum alloy sample with the aluminum alloy mark of 1420, removing stains such as oil stains on the surface of the sample, and drying for later use;
2) carrying out electric spark deposition on the defect part of the sample, wherein the electrode material comprises: 2325 aluminum alloy wire. Voltage: 120V, discharge frequency: 450Hz, electrode rotation speed: 600/min, electrode inclination: 45 °, electrode diameter: 2.4mm, Ar gas flow: 15L/min, and the thickness of the deposited metal layer is 1.5 mm;
3) cold-press welding the deposited metal layer by using an electric vibrator, wherein the pressing depth of the end part of the vibrating rod into the deposited metal layer is 1.0mm, the diameter d of a main body at the end part of the vibrating rod is 3.0mm, the included angle alpha is 30 degrees, the tip arc r is 0.4mm, the vibration power P is 300W, the vibration frequency f is 50Hz, the amplitude A is 1.0mm, and the moving speed v of the vibrating rod is 0.5 mm/s; and (3) applying the end part of the vibrating rod on the surface of the deposited metal layer, and rapidly vibrating the vibrating rod according to the moving track of figure 2 to generate enough pressure on the local deposited metal layer contacted with the vibrating rod so as to carry out cold pressure welding. Until the single layer is completely deposited with the metal layer, cold pressure welding is carried out;
4) sequentially repeating the steps 2 and 3 until the whole defect is filled up and 2.0mm higher than the surrounding base material, and finishing the repair welding;
5) and after repairing, removing redundant repair welding metal and polishing, firstly grinding the repair welding area by using No. 600 abrasive paper until the repair welding area is basically flush with the surface of the base metal, and then sequentially polishing the repair welding metal by using No. 1200 abrasive paper to obtain a repaired alloy sample (refer to FIG. 7).
Example 2
1) Presetting a defective aluminum alloy sample with the aluminum alloy brand of 5A06, removing stains such as oil stains on the surface of the sample, and drying for later use;
2) carrying out electric spark deposition on the defect part of the sample, wherein the electrode material comprises the following components: 2325 aluminum alloy wire. Voltage: 120V, discharge frequency: 450Hz, electrode rotation speed: 600/min, electrode inclination: 45 °, electrode diameter: 2.4mm, Ar gas flow: 15L/min, and the thickness of the deposited metal layer is 1.8 mm;
3) cold-press welding the deposited metal layer by using an electric vibrator, wherein the pressing depth of the end part of the vibrating rod into the deposited metal layer is 1.5mm, the diameter d of a main body at the end part of the vibrating rod is 3.0mm, the included angle alpha is 45 degrees, the tip arc r is 0.5mm, the vibration power P is 300W, the vibration frequency f is 50Hz, the amplitude A is 1.5mm, and the moving speed v of the vibrating rod is 0.5 mm/s; and (3) applying the end part of the vibrating rod on the surface of the deposited metal layer, and rapidly vibrating the vibrating rod according to the moving track of figure 2 to generate enough pressure on the local deposited metal layer contacted with the vibrating rod so as to carry out cold pressure welding. Until the single layer is completely deposited with the metal layer, cold pressure welding is carried out;
4) repeating the steps 2 and 3 in sequence until the whole defect is filled up and 2.0mm higher than the surrounding base material, and finishing the repair welding;
5) and after repairing, removing redundant repair welding metal and polishing, firstly polishing the repair welding area by using 600# abrasive paper until the repair welding area is basically flush with the surface of the base metal, and then sequentially polishing the repair welding metal by using 1200# abrasive paper to obtain a repaired alloy sample.
Comparative example 1
Referring to fig. 6, the repairing method is different from embodiment 1 in that:
1) presetting a defective aluminum alloy sample with the aluminum alloy mark of 1420, removing stains such as oil stains on the surface of the sample, and drying for later use;
2) carrying out electric spark deposition on the defect part of the sample, wherein the electrode material comprises: 2325 aluminum alloy wire. Voltage: 120V, discharge frequency: 450Hz, electrode rotation speed: 600/min, electrode inclination: 45 °, electrode diameter: 2.4mm, Ar gas flow: 15L/min, and the thickness of the deposited metal is 0.3 mm;
3) step 2 is sequentially and repeatedly carried out until the whole defect position is filled up and is 2.0mm higher than the surrounding base materials, and the repair welding is finished;
4) and after repairing, removing redundant repair welding metal and polishing, firstly polishing the repair welding area by using 600# abrasive paper until the repair welding area is basically flush with the surface of the base metal, and then sequentially polishing the repair welding metal by using 1200# abrasive paper to obtain a repaired alloy sample.
Performance detection
According to the GB/T228-2010 metal material room temperature tensile test method, the repaired alloy samples obtained in the examples and the comparative examples are subjected to the detection of the shear strength and the tensile strength, and the detection results are shown in Table 1.
TABLE 1 results of testing the properties of the repaired metals
| Item | Shear strength/(MPa) | Tensile strength/(MPa) |
| Example 1 | 67.5 | 9.5 |
| Example 2 | 72.0 | 13.5 |
| Comparative example 1 | ＜1.0 | ＜1.0 |
According to the table 1, the shearing strength and the tensile strength of the repaired metal obtained by the pure electric spark deposition repairing method are extremely low, and the shearing strength and the tensile strength of the repaired metal obtained by the electric spark deposition/cold pressure welding composite repairing method are obviously improved.
According to the invention concept of the invention, although the conventional cold press welding method theoretically has feasibility of densification treatment on the electric spark deposited metal, the conventional cold press welding method has complex process equipment, larger volume and poor adaptability to defect positions, and is difficult to apply in engineering.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. An electric spark deposition-cold pressure welding composite repairing method is characterized in that: the method comprises the following steps:
s1, depositing a layer of metal on the surface of the defect of the non-ferrous metal alloy base material by adopting an electric spark deposition process to obtain a deposited metal layer;
s2, vertically acting on the surface of the deposited metal layer by a vibration component and applying pressure to the deposited metal layer to compress the deposited metal layer, applying pressure to the partial deposited metal in contact with the metal layer to perform cold pressure welding, moving a vibration rod, and performing cold pressure welding to all the deposited metal layers;
and S3, repeating the step S1 and the step S2 until the whole defect part is filled up and 1.0-2.0 mm higher than the surrounding base material, and completing the repair welding.
2. The electric spark deposition-cold press welding composite repairing method as claimed in claim 1, wherein: the vibration part comprises a conical end part, and the tip position of the conical end part is arranged in an arc shape.
3. The electric spark deposition-cold press welding composite repairing method as claimed in claim 2, wherein: the maximum diameter d of the conical end part is 2.0-5.0 mm, the conical angle alpha is 30-60 degrees, and the tip circular arc r is 0.4-0.6 mm.
4. The electric spark deposition-cold press welding composite repairing method as claimed in claim 1, wherein: the thickness of the deposited metal layer is 1.5-2.5 mm.
5. The electric spark deposition-cold press welding composite repairing method as claimed in claim 1, wherein: the depth of the end part of the vibrating rod pressed into the deposited metal layer is 1-2 mm.
6. The electric spark deposition-cold press welding composite repairing method as claimed in claim 1, wherein: the vibration frequency f of the vibration rod is 50-100 Hz, the moving speed v of the vibration rod is 0.5-1.0 mm/s, and the amplitude A is not less than the depth of the vibration rod pressed into the deposited metal layer.
7. The electric spark deposition-cold press welding composite repairing method as claimed in claim 1, wherein: the moving track of the vibrating rod is as follows: and pressing the vibrating rods into the deposited metal layers in sequence along the linear direction, moving to the linear direction of the next row, and continuously pressing the deposited metal layers, wherein the adjacent pressing points of the vibrating rods need the overlapping area with the pressing point diameter of 1/3-2/3.
8. The electric spark deposition-cold pressure welding composite repairing method as claimed in claim 1, wherein the repairing method comprises the following steps: the non-ferrous metal alloy comprises aluminum alloy and magnesium alloy.
9. The electric spark deposition-cold pressure welding composite repairing method as claimed in claim 1, wherein the repairing method comprises the following steps: the electric spark deposition process parameters are as follows: the voltage is 110-130V, the discharge frequency is 300-500 Hz, the electrode rotation speed is 500-600/min, the electrode inclination angle is 30-45 degrees, the electrode diameter is 2.4-3.2 mm, and the Ar gas flow is 15-20L/min.
10. The electric spark deposition-cold press welding composite repairing method as claimed in claim 1, wherein: and after the step S3, grinding and polishing the repair welding area.
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| CN202210314342.5A CN114654164A (en) | 2022-03-28 | 2022-03-28 | Electric spark deposition-cold pressure welding composite repairing method |
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Citations (7)
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| CN101284341A (en) * | 2008-04-15 | 2008-10-15 | 广东工业大学 | Integrated device of ultrasound auxiliary electric spark deposition and repair and ultrasound polish and method thereof |
| CN104191057A (en) * | 2014-08-13 | 2014-12-10 | 中国电器科学研究院有限公司 | Preparing method for porous metal matrix compound brazing filler metal alloy soldering head |
| CN108672964A (en) * | 2018-07-10 | 2018-10-19 | 河南科技大学 | A kind of electric spark deposition built-up welding contact force automatic control device and autocontrol method |
| CN112496669A (en) * | 2020-10-30 | 2021-03-16 | 罗阿龙 | Welding equipment for repairing cracks of automobile engine parts |
| CN112676678A (en) * | 2020-12-17 | 2021-04-20 | 河北星烁锯业股份有限公司 | Welding repair method for circular saw blade cracks |
| CN112958881A (en) * | 2021-02-05 | 2021-06-15 | 安徽马钢设备检修有限公司 | Manual welding device and welding process for cracking of suspension type gear reducer box body |
| CN113001098A (en) * | 2021-03-03 | 2021-06-22 | 中国人民解放军陆军装甲兵学院 | Electric spark deposition-ultrasonic rolling composite repairing method for surface damage of metal part |
-
2022
- 2022-03-28 CN CN202210314342.5A patent/CN114654164A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101284341A (en) * | 2008-04-15 | 2008-10-15 | 广东工业大学 | Integrated device of ultrasound auxiliary electric spark deposition and repair and ultrasound polish and method thereof |
| CN104191057A (en) * | 2014-08-13 | 2014-12-10 | 中国电器科学研究院有限公司 | Preparing method for porous metal matrix compound brazing filler metal alloy soldering head |
| CN108672964A (en) * | 2018-07-10 | 2018-10-19 | 河南科技大学 | A kind of electric spark deposition built-up welding contact force automatic control device and autocontrol method |
| CN112496669A (en) * | 2020-10-30 | 2021-03-16 | 罗阿龙 | Welding equipment for repairing cracks of automobile engine parts |
| CN112676678A (en) * | 2020-12-17 | 2021-04-20 | 河北星烁锯业股份有限公司 | Welding repair method for circular saw blade cracks |
| CN112958881A (en) * | 2021-02-05 | 2021-06-15 | 安徽马钢设备检修有限公司 | Manual welding device and welding process for cracking of suspension type gear reducer box body |
| CN113001098A (en) * | 2021-03-03 | 2021-06-22 | 中国人民解放军陆军装甲兵学院 | Electric spark deposition-ultrasonic rolling composite repairing method for surface damage of metal part |
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