A brazing joint wetting structure and method

Abstract

The present application relates to a kind of brazing welding infiltration structure and infiltration method, the infiltration structure includes strip-shaped infiltration area and the fold line infiltration area arranged in the strip-shaped infiltration area;The infiltration area of the infiltration structure is 75-85% of the welding surface area;The fold line infiltration area includes parallel line infiltration subarea and the oblique line infiltration subarea arranged between parallel line infiltration subarea;The included angle between the oblique line infiltration subarea and the center line in parallel line infiltration subarea is 30-45 °.The infiltration structure provided by the present application, by the design of brazing filler metal infiltration layer in brazing process, by using the infiltration structure of specific design, using two independent infiltration areas, improve the infiltration effect of brazing filler metal, so as to ensure the welding joint bonding rate after welding, it is favorable for the binding of welding object.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of brazing welding, in particular to a brazing welding infiltration structure and method. BACKGROUND

[0002] At present, when the target material and the back plate are welded, the brazing method is usually used for welding, so as to realize the connection of the target material and the back plate, and then obtain a target assembly that can be used.

[0003] CN114101829A discloses a target brazing method, which comprises roughness treatment and nickel alloy spraying treatment of the binding surface of the target blank and the back plate. Then the back plate is placed flat, and an indium sheet is placed on it in sequence. The positive and negative electrodes of the voltage stabilizing power supply are connected to the target blank and the back plate respectively. The indium sheet is melted into indium melt by electric heating, and the indium melt flows to fill the nickel alloy layer of the binding surface of the target blank and the back plate. Then the voltage is removed and natural cooling is performed to complete the binding of the back plate and the target blank. Since the whole process is not limited by the size of the heating platform, and the indium sheet can be spliced, the size of the bindable target material is further expanded.

[0004] CN116038050A discloses a brazing method for titanium-aluminum alloy target material and aluminum alloy back plate, which comprises the following steps: (1) the welding surface of the titanium-aluminum alloy target material is subjected to sand blasting treatment and nickel plating treatment in sequence to obtain a pretreated titanium-aluminum alloy target material; (2) the purified aluminum alloy back plate and the pretreated titanium-aluminum alloy target material obtained in step (1) are independently subjected to infiltration treatment to obtain an infiltrated aluminum alloy back plate and an infiltrated titanium-aluminum alloy target material; (3) the infiltrated titanium-aluminum alloy target material and the infiltrated aluminum alloy back plate obtained in step (2) are buckled, and a titanium-aluminum alloy target assembly is obtained after cooling under pressure. By pretreating the welding surface of the titanium-aluminum alloy target material and combining reasonable infiltration process parameters and cooling methods, the titanium-aluminum alloy target assembly obtained has high welding bonding rate and bonding strength, which can meet the high-quality requirements as a sputtering material.

[0005] However, there is still a problem of poor welding bonding rate of the welded joint after brazing in the current welding process. SUMMARY

[0006] In view of the problems in the prior art, the present application aims to provide a brazing welding infiltration structure and method to solve the problem of poor welding bonding rate of the welded joint after brazing.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] In a first aspect, the present application provides a brazing welding infiltration structure, which comprises a strip-shaped infiltration zone and a fold line infiltration zone arranged in the strip-shaped infiltration zone.

[0009] The infiltration area of the infiltration structure is 75-85% of the welding surface area;

[0010] The zigzag line infiltration area comprises parallel line infiltration sub-areas and diagonal line infiltration sub-areas arranged between the parallel line infiltration sub-areas;

[0011] The included angle between the diagonal line infiltration sub-area and the center line in the parallel line infiltration sub-area is 30-45°.

[0012] The infiltration structure provided by the application improves the infiltration effect of the filler metal by using two independent infiltration areas through the design of the filler metal infiltration layer in the brazing process, thereby ensuring the welding joint rate of the welded joint after welding and facilitating the binding of the welding object.

[0013] As a preferred technical solution of the application, the width of the belt in the belt-shaped infiltration area is 16-17% of the equivalent circle diameter of the welding surface.

[0014] Preferably, the outer edge of the belt-shaped infiltration area overlaps the edge of the welding surface.

[0015] As a preferred technical solution of the application, the vertical width between adjacent parallel lines in the parallel line infiltration sub-area is 16-17% of the equivalent circle diameter of the welding surface.

[0016] As a preferred technical solution of the application, the width of the straight line belt area in the parallel line infiltration sub-area is 16-17% of the equivalent circle diameter of the welding surface.

[0017] As a preferred technical solution of the application, the width of the straight line belt area in the diagonal line infiltration sub-area is 16-17% of the equivalent circle diameter of the welding surface.

[0018] In a second aspect, the application provides a brazing welding infiltration method, which comprises the infiltration operation according to the infiltration structure of the first aspect, including belt-shaped infiltration operation and zigzag line infiltration operation.

[0019] The belt-shaped infiltration operation is performed according to the shape of the belt-shaped infiltration area.

[0020] The zigzag line infiltration operation is performed according to the shape of the zigzag line infiltration area.

[0021] As a preferred technical solution of the application, the belt-shaped infiltration operation is performed at least 4 times.

[0022] As a preferred technical solution of the application, the zigzag line infiltration operation is performed at least 3 times.

[0023] As a preferred technical solution of the application, the power of the ultrasonic wave in the infiltration operation is 700-900 W.

[0024] Preferably, the operation temperature in the infiltrating operation is 290-310℃.

[0025] As a preferred technical scheme of the present application, the infiltrating method comprises performing the infiltrating operation according to the infiltrating structure of the first aspect, including a strip-shaped infiltrating operation and a zigzag-shaped infiltrating operation.

[0026] The strip-shaped infiltrating operation is performed according to the shape of the strip-shaped infiltrating area; and the strip-shaped infiltrating operation is performed at least 4 times.

[0027] The zigzag-shaped infiltrating operation is performed according to the shape of the zigzag-shaped infiltrating area; and the zigzag-shaped infiltrating operation is performed at least 3 times.

[0028] The power of the ultrasonic wave in the infiltrating operation is 700-900W.

[0029] The operation temperature in the infiltrating operation is 290-310℃.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] The infiltrating structure provided by the present application realizes efficient infiltration of the brazing welding surface by using two specific infiltrating areas in cooperation, which is conducive to ensuring the brazing welding joint rate, and the welding joint rate of the obtained welding joint can reach 100%, effectively improving the stability of the brazing welding. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the infiltrating structure of the welding surface in the square target material and the back plate in the embodiment of the present application;

[0033] Figure 2 is a schematic diagram of the infiltrating structure of the welding surface in the circular target material and the back plate in the embodiment of the present application.

[0034] The present application will be further described in detail below. However, the following examples are only simple examples of the present application, and do not represent or limit the protection scope of the present application, and the protection scope of the present application is subject to the claims. DETAILED DESCRIPTION

[0035] In order to better illustrate the present application and facilitate understanding of the technical scheme of the present application, the typical but non-limiting embodiments of the present application are as follows:

[0036] The present embodiment provides an infiltrating structure for brazing welding, which comprises a strip-shaped infiltrating area and a zigzag-shaped infiltrating area arranged in the strip-shaped infiltrating area.

[0037] The infiltrating area of the infiltrating structure is 75-85% of the welding surface area.

[0038] The fold line infiltration area includes parallel line infiltration sub-areas and diagonal line infiltration sub-areas arranged between the parallel line infiltration sub-areas.

[0039] The included angle between the diagonal line infiltration sub-area and the center line in the parallel line infiltration sub-area is 30-45°.

[0040] The infiltration area of the infiltration structure is 75-85% of the welding surface area, for example, it can be 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, or 85%, etc., but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0041] The included angle between the diagonal line infiltration sub-area and the center line in the parallel line infiltration sub-area is 30-45°, that is, the included angle between the diagonal line in the diagonal line infiltration sub-area and one of the straight lines in the parallel line infiltration sub-area is 30-45°, for example, it can be 30°, 30°, 32°, 34°, 36°, 38°, 40°, 42°, 44°, or 45°, etc., but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0042] The parallel line infiltration sub-areas and the diagonal line infiltration sub-areas arranged between the parallel line infiltration sub-areas can be reasonably selected according to the limitation of the infiltration area. For example, there are continuous parallel line infiltration sub-areas and diagonal line infiltration sub-areas, and the planes in adjacent parallel line infiltration sub-areas share a straight line, or there are multiple parallel line infiltration sub-areas and diagonal line infiltration sub-areas arranged between the parallel line infiltration sub-areas, that is, there is no shared straight line between the parallel lines in adjacent parallel line infiltration sub-areas.

[0043] Specifically, the width of the strip in the strip-shaped infiltration area is 16-17% of the equivalent circle diameter of the welding surface, for example, it can be 16%, 16.2%, 16.4%, 16.6%, 16.8%, or 17%, etc., but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0044] Specifically, the outer edge of the strip-shaped infiltration area overlaps with the edge of the welding surface.

[0045] Specifically, the perpendicular width between adjacent parallel lines in the parallel line infiltration sub-area is 16-17% of the equivalent circle diameter of the welding surface, for example, it can be 16%, 16.2%, 16.4%, 16.6%, 16.8%, or 17%, etc., but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0046] Specifically, the width of the straight line band area in the parallel line infiltration sub-area is 16-17% of the equivalent circle diameter of the welding surface, for example, it can be 16%, 16.2%, 16.4%, 16.6%, 16.8%, or 17%, etc., but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0047] Specifically, the width of the straight line band area in the oblique line infiltration sub-area is 16-17% of the equivalent circle diameter of the welding surface, for example, it can be 16%, 16.2%, 16.4%, 16.6%, 16.8%, or 17%, etc., but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0048] Further, the embodiment also provides an infiltration method according to the foregoing infiltration structure, which includes performing an infiltration operation according to the infiltration structure, including a band-shaped infiltration operation and a zigzag line infiltration operation;

[0049] The band-shaped infiltration operation is to perform infiltration according to the shape of the band-shaped infiltration area.

[0050] The zigzag line infiltration operation is to perform infiltration according to the shape of the zigzag line infiltration area.

[0051] Specifically, the band-shaped infiltration operation is performed at least 4 times, that is, the infiltration is repeated at least 4 times in the band-shaped infiltration area.

[0052] Specifically, the zigzag line infiltration operation is performed at least 3 times, that is, the infiltration is repeated at least 3 times in the zigzag line infiltration area.

[0053] Specifically, the power of the ultrasonic wave in the infiltration operation is 700-900W, for example, it can be 700W, 720W, 740W, 760W, 780W, 800W, 820W, 840W, 860W, 880W, or 900W, etc., but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0054] Specifically, the operation temperature in the infiltration operation is 290-310℃, for example, it can be 290℃, 292℃, 294℃, 296℃, 298℃, 300℃, 302℃, 304℃, 306℃, 308℃, or 310℃, etc., but is not limited to the listed values, and other unlisted values within the range are also applicable.

[0055] In the embodiment, the infiltration object is to perform corresponding infiltration on the welding surfaces of two welding pieces. The corresponding welding can be target material and back plate, or other objects that need to be brazed. Among them, the target material and back plate can be target material and back plate that need to be brazed in the field of target material, the shape of the target material can be a circular target material, or a polygonal target material, etc., and the material can be aluminum, copper, aluminum-copper alloy, etc.

[0056] Specifically, the infiltrating structure of the square target material and the back plate is as shown in Figure 1 The infiltrating structure of the circular target material and the back plate is as shown in Figure 2 The infiltrating structure of the circular target material and the back plate is as shown in

[0057] In the present application, the mass of the brazing filler metal used in the infiltrating process and the area ratio of the infiltrating surface is kg / m 2 1:(0.13-0.15).

[0058] In order to further illustrate the effect of the infiltrating structure of the present application on the welding bonding rate, the following embodiments are provided:

[0059] Example 1

[0060] The present embodiment provides an infiltrating structure and a infiltrating method for brazing welding, the infiltrating structure comprising a strip-shaped infiltrating area and a zigzag-shaped infiltrating area arranged in the strip-shaped infiltrating area;

[0061] The infiltrating area of the infiltrating structure is 80% of the welding surface area;

[0062] The zigzag-shaped infiltrating area comprises parallel line infiltrating sub-areas and diagonal line infiltrating sub-areas arranged between the parallel line infiltrating sub-areas;

[0063] The included angle between the diagonal line infiltrating sub-areas and the center line of the parallel line infiltrating sub-areas is 40°;

[0064] The width of the strip in the strip-shaped infiltrating area is 16.4% of the diameter of the welding surface circle;

[0065] The outer edge of the strip-shaped infiltrating area overlaps with the edge of the welding surface;

[0066] The vertical width between adjacent parallel lines in the parallel line infiltrating sub-areas is 16.6% of the diameter of the welding surface circle;

[0067] The width of the straight line strip area in the parallel line infiltrating sub-areas is 16% of the equivalent circle diameter of the welding surface;

[0068] The width of the straight line strip area in the diagonal line infiltrating sub-areas is 17% of the equivalent circle diameter of the welding surface;

[0069] The specific infiltrating process is as follows:

[0070] The infiltrating structure performs infiltrating operations, including strip-shaped infiltrating operations and zigzag-shaped infiltrating operations;

[0071] The strip-shaped infiltrating operation is performed according to the shape of the strip-shaped infiltrating area; the strip-shaped infiltrating operation is performed 4 times;

[0072] The zigzag-shaped infiltrating operation is performed according to the shape of the zigzag-shaped infiltrating area; the zigzag-shaped infiltrating operation is performed 3 times;

[0073] The power of the ultrasonic wave in the infiltration operation is 800 W;

[0074] The operation temperature in the infiltration operation is 300 ℃.

[0075] Example 2

[0076] The present embodiment provides a brazing welding infiltration structure and infiltration method, the infiltration structure includes a strip-shaped infiltration area and a fold line infiltration area arranged in the strip-shaped infiltration area;

[0077] The infiltration area of the infiltration structure is 82% of the welding surface area;

[0078] The fold line infiltration area includes parallel line infiltration sub-areas and diagonal line infiltration sub-areas arranged between the parallel line infiltration sub-areas;

[0079] The included angle between the diagonal line infiltration sub-area and the center line in the parallel line infiltration sub-area is 37°;

[0080] The width of the strip in the strip-shaped infiltration area is 16.7% of the equivalent circle diameter of the welding surface;

[0081] The outer edge of the strip-shaped infiltration area overlaps the edge of the welding surface;

[0082] The vertical width between adjacent parallel lines in the parallel line infiltration sub-area is 16.3% of the equivalent circle diameter of the welding surface;

[0083] The width of the straight line strip area in the parallel line infiltration sub-area is 17% of the equivalent circle diameter of the welding surface;

[0084] The width of the straight line strip area in the diagonal line infiltration sub-area is 16% of the equivalent circle diameter of the welding surface;

[0085] The specific infiltration process is as follows:

[0086] The infiltration structure performs an infiltration operation, including a strip-shaped infiltration operation and a fold line infiltration operation;

[0087] The strip-shaped infiltration operation is to infiltrate according to the shape of the strip-shaped infiltration area; the strip-shaped infiltration operation is performed 5 times;

[0088] The fold line infiltration operation is to infiltrate according to the shape of the fold line infiltration area; the fold line infiltration operation is performed 3 times;

[0089] The power of the ultrasonic wave in the infiltration operation is 700 W;

[0090] The operation temperature in the infiltration operation is 290 ℃.

[0091] Example 3

[0092] The brazing welding infiltration structure comprises a strip-shaped infiltration area and a zigzag-shaped infiltration area arranged in the strip-shaped infiltration area.

[0093] The infiltration area of the infiltration structure is 75% of the welding surface area.

[0094] The zigzag-shaped infiltration area comprises parallel line infiltration sub-areas and diagonal line infiltration sub-areas arranged between the parallel line infiltration sub-areas.

[0095] The included angle between the diagonal line infiltration sub-areas and the center line of the parallel line infiltration sub-areas is 45°.

[0096] The width of the strip in the strip-shaped infiltration area is 17% of the equivalent circle diameter of the welding surface.

[0097] The outer edge of the strip-shaped infiltration area overlaps the edge of the welding surface.

[0098] The vertical width between adjacent parallel lines in the parallel line infiltration sub-areas is 16% of the equivalent circle diameter of the welding surface.

[0099] The width of the straight line strip area in the parallel line infiltration sub-areas is 16.3% of the equivalent circle diameter of the welding surface.

[0100] The width of the straight line strip area in the diagonal line infiltration sub-areas is 16.8% of the equivalent circle diameter of the welding surface.

[0101] The specific infiltration process is as follows:

[0102] The infiltration structure performs infiltration operations, including strip-shaped infiltration operations and zigzag-shaped infiltration operations.

[0103] The strip-shaped infiltration operation is performed according to the shape of the strip-shaped infiltration area; the strip-shaped infiltration operation is performed 4 times.

[0104] The zigzag-shaped infiltration operation is performed according to the shape of the zigzag-shaped infiltration area; the zigzag-shaped infiltration operation is performed 3 times.

[0105] The power of the ultrasonic wave in the infiltration operation is 900W.

[0106] The operation temperature in the infiltration operation is 310℃.

[0107] Example 4

[0108] The brazing welding infiltration structure comprises a strip-shaped infiltration area and a zigzag-shaped infiltration area arranged in the strip-shaped infiltration area.

[0109] The infiltration area of the infiltration structure is 85% of the welding surface area.

[0110] The zigzag line infiltration area comprises parallel line infiltration sub-areas and diagonal line infiltration sub-areas arranged between the parallel line infiltration sub-areas;

[0111] The included angle between the diagonal line infiltration sub-area and the center line in the parallel line infiltration sub-area is 30°;

[0112] The width of the belt in the belt-shaped infiltration area is 16% of the equivalent circle diameter of the welding surface;

[0113] The outer edge of the belt-shaped infiltration area overlaps with the edge of the welding surface;

[0114] The vertical width between adjacent parallel lines in the parallel line infiltration sub-area is 17% of the equivalent circle diameter of the welding surface;

[0115] The width of the straight line belt area in the parallel line infiltration sub-area is 16.7% of the equivalent circle diameter of the welding surface;

[0116] The width of the straight line belt area in the diagonal line infiltration sub-area is 16.4% of the equivalent circle diameter of the welding surface;

[0117] The specific infiltration process is as follows:

[0118] The infiltration structure performs an infiltration operation, which comprises a belt-shaped infiltration operation and a zigzag line infiltration operation;

[0119] The belt-shaped infiltration operation is performed according to the shape of the belt-shaped infiltration area; the belt-shaped infiltration operation is performed 4 times;

[0120] The zigzag line infiltration operation is performed according to the shape of the zigzag line infiltration area; the zigzag line infiltration operation is performed 3 times;

[0121] The power of the ultrasonic wave in the infiltration operation is 800 W;

[0122] The operation temperature in the infiltration operation is 305°C.

[0123] Example 5

[0124] The difference from Example 1 is only that the infiltration area of the infiltration structure is 100% of the welding surface area, that is, the welding surface is completely infiltrated at this time.

[0125] Example 6

[0126] The difference from Example 1 is only that the infiltration area of the infiltration structure is 50% of the welding surface area.

[0127] Example 7

[0128] The difference from Example 1 is only that the belt-shaped infiltration area is not arranged in the infiltration structure.

[0129] Example 8

[0130] The difference from the embodiment 1 is that the slant line infiltration sub-zone is not arranged in the fold line infiltration zone.

[0131] Example 9

[0132] The difference from the embodiment 1 is that the slant line infiltration sub-zone is not arranged in the fold line infiltration zone.

[0133] Example 10

[0134] The difference from the embodiment 1 is that the infiltration structure is arranged only on the target welding surface, and the back plate welding surface is fully infiltrated, that is, the infiltration area is 100% of the welding surface.

[0135] Example 11

[0136] The difference from the embodiment 1 is that the infiltration structure is arranged only on the target welding surface, and the back plate welding surface is fully infiltrated, that is, the infiltration area is 100% of the welding surface.

[0137] The target and the back plate with the above infiltration structure are brazed, and the specific target is a circular target with a diameter of 300 mm, which is a copper target, and the back plate is an aluminum back plate matched with the target. Specifically, the target and the back plate are assembled after infiltration, and then pressed together under a pressure of 100 kg for 20 min. The product obtained by pressing is detected by C-scan, that is, ultrasonic defect detection, to detect the welding bonding rate. The results are shown in Table 1.

[0138] Table 1

[0139] Welding bond rate / % Example 1 100 Example 2 100 Example 3 100 Example 4 100 Example 5 95.5 Example 6 94.5 Example 7 85.1 Example 8 80.6 Example 9 95.3 Example 10 92.6 Example 11 95.1

[0140] According to the results of the above embodiments, the infiltration structure provided by the present application can realize efficient welding between the welding targets after pressing after infiltration, which is beneficial to realize efficient welding, and the welding bonding rate can reach 100%.

[0141] It is declared that the detailed structural features of the present application are illustrated by the above embodiments, but the present application is not limited to the above detailed structural features, that is, it does not mean that the present application must rely on the above detailed structural features to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of the components selected by the present application, increase of auxiliary components, selection of specific modes, etc. fall within the protection scope and disclosure scope of the present application.

[0142] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the specific details of the above-described embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0143] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not further describe various possible combinations.

[0144] In addition, various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the idea of the present application, and it should also be considered as disclosed by the present application.

Claims

1. A brazing welding wetting structure, characterized in that, The impregnation structure includes a strip-shaped impregnation area and a zigzag impregnation area disposed in the strip-shaped impregnation area; The width of the strip in the strip-shaped wetting zone is 16-17% of the equivalent circle diameter of the welding surface; The wetting area of ​​the wetting structure is 75-85% of the area of ​​the welding surface; The polygonal wetting region includes a parallel line wetting sub-region and an oblique line wetting sub-region disposed between the parallel line wetting sub-regions; The angle between the center lines of the oblique-line immersion sub-region and the parallel-line immersion sub-region is 30-45°.

2. The wetting structure as described in claim 1, characterized in that, The outer edge of the strip-shaped wetting area overlaps with the edge of the welding surface.

3. The wetting structure as described in claim 1, characterized in that, The vertical width between adjacent parallel lines in the parallel line wetting sub-region is 16-17% of the diameter of the equivalent circle of the welding surface.

4. The wetting structure as described in claim 1, characterized in that, The width of the straight band in the parallel line wetting sub-region is 16-17% of the diameter of the equivalent circle of the welding surface.

5. The wetting structure as described in claim 1, characterized in that, The width of the straight band in the oblique wetting sub-region is 16-17% of the equivalent circle diameter of the welding surface.

6. A method for impregnating brazing, characterized in that, The impregnation method includes impregnation operations according to the impregnation structure of any one of claims 1-5, including strip impregnation operations and zigzag impregnation operations; The strip-shaped impregnation operation is carried out according to the shape of the strip-shaped impregnation area; The zigzag wetting operation is performed based on the shape of the zigzag wetting area.

7. The impregnation method as described in claim 6, characterized in that, The strip impregnation operation shall be performed at least 4 times.

8. The impregnation method as described in claim 6, characterized in that, The zigzag wetting operation shall be performed at least 3 times.

9. The impregnation method as described in claim 6, characterized in that, The ultrasonic power used in the immersion operation is 700-900W.

10. The impregnation method as described in claim 6, wherein the operating temperature during the impregnation operation is 290-310°C.

11. The impregnation method as described in claim 6, characterized in that, The impregnation method includes impregnation operations according to the impregnation structure of any one of claims 1-5, including strip impregnation operations and zigzag impregnation operations; The strip-shaped impregnation operation is performed according to the shape of the strip-shaped impregnation area; the strip-shaped impregnation operation is performed at least 4 times; The zigzag wetting operation is performed based on the shape of the zigzag wetting area; the zigzag wetting operation is performed at least 3 times. The power of the ultrasonic waves used in the immersion operation is 700-900W; The operating temperature during the immersion operation is 290-310℃.

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