阅读说明：本技术 一种钢平衡片与铝合金传动轴铆焊系统及方法 (Rivet welding system and method for steel balance sheet and aluminum alloy transmission shaft ) 是由 高忠林 史涛 于世宝 田增泰 郭悦 于 2021-09-29 设计创作，主要内容包括：本发明提供了一种钢平衡片与铝合金传动轴铆焊系统及方法,包括凸焊机、与凸焊机配合安装的上电极和下电极,所述上电极的下端面为匹配铝合金传动轴的弧形面,所述下电极的上端面为匹配钢平衡片的弧形面,所述下电极的弧形面上设有钢平衡片,所述传动轴设置于钢平衡片和上电极之间。本发明有益效果：使用铆焊的方法对钢平衡片与铝合金传动轴进行焊接,提高了钢平衡片与铝合金传动轴的焊接强度和生产效率。(The invention provides a rivet welding system and method for a steel balance sheet and an aluminum alloy transmission shaft, and the rivet welding system comprises a projection welding machine, an upper electrode and a lower electrode, wherein the upper electrode and the lower electrode are installed in a matched mode with the projection welding machine, the lower end face of the upper electrode is an arc-shaped face matched with the aluminum alloy transmission shaft, the upper end face of the lower electrode is an arc-shaped face matched with the steel balance sheet, the steel balance sheet is arranged on the arc-shaped face of the lower electrode, and the transmission shaft is arranged between the steel balance sheet and the upper electrode. The invention has the beneficial effects that: the steel balance sheet and the aluminum alloy transmission shaft are welded by using a rivet welding method, so that the welding strength and the production efficiency of the steel balance sheet and the aluminum alloy transmission shaft are improved.)

1. The utility model provides a steel balance piece and aluminum alloy transmission shaft rivet welding system which characterized in that: including projection welding machine (1), with upper electrode (2) and bottom electrode (3) of projection welding machine (1) cooperation installation, the arcwall face of lower terminal surface for matching aluminum alloy transmission shaft (4) of upper electrode (2), the up end of bottom electrode (3) is the arcwall face of matching steel balance sheet (5), be equipped with steel balance sheet (5) on the arcwall face of bottom electrode (3), the transmission shaft sets up between steel balance sheet (5) and upper electrode (2).

2. The rivet welding system for the steel balance sheet and the aluminum alloy transmission shaft according to claim 1, characterized in that: the aluminum alloy rivet is characterized in that an installation through hole (501) matched with a nail column (601) of an aluminum alloy rivet (6) is formed in the steel balance sheet (5), the aluminum alloy rivet (6) is installed on the inner side of the installation through hole (501), the upper end face of the nail column (601) of the aluminum alloy rivet (6) is in close contact with an aluminum alloy transmission shaft (4), a nail cap (602) of the aluminum alloy rivet (6) is in close contact with a lower electrode (3), and the height of the aluminum alloy rivet (6) with the nail column (601) protruding out of the upper surface of the steel balance sheet (5) is 40% -60% of the diameter of the nail column (601) of the aluminum alloy rivet (6).

3. The rivet welding system for the steel balance sheet and the aluminum alloy transmission shaft according to claim 2, characterized in that: the up end of steel balance piece (5) be with aluminum alloy transmission shaft (4) external diameter assorted arcwall face, under steel balance piece (5) the terminal surface be with bottom electrode (3) up end assorted arcwall face, both sides all are equipped with spacing boss (301) on bottom electrode (3), the width phase-match of distance between two spacing bosses (301) and steel balance piece (5).

4. A rivet welding method of a steel balance sheet and an aluminum alloy transmission shaft based on the rivet welding system of the steel balance sheet and the aluminum alloy transmission shaft according to any one of claims 1 to 3, characterized by comprising the following steps: the method comprises the following steps:

s1, mounting the aluminum alloy rivet (6) on the inner side of the mounting through hole (501) of the steel balance sheet (5), placing the steel balance sheet (5) and the aluminum alloy rivet (6) on the arc-shaped surface of the lower electrode (3), and placing the aluminum alloy transmission shaft (4) on the steel balance sheet (5);

s2, a pre-pressing procedure, namely driving the upper electrode (2) to press downwards and pre-pressing the aluminum alloy transmission shaft (4) and the aluminum alloy rivet (6);

s3, welding, namely electrifying the upper electrode (2) and the lower electrode (3) after the pre-pressing is finished, and performing welding operation;

s4, a voltage stabilization procedure, wherein after the welding is finished, the pressure of the upper electrode (2) is maintained for a certain time;

and S5, lifting the upper electrode (2) and taking out the welded aluminum alloy transmission shaft (4).

5. The rivet welding method for the steel balance sheet and the aluminum alloy transmission shaft according to claim 4, characterized in that: before the step S1, the aluminum alloy rivet (6) and the aluminum alloy propeller shaft (4) are chemically cleaned.

6. The rivet welding method for the steel balance sheet and the aluminum alloy transmission shaft according to claim 4, characterized in that: before the step S3, there is a preheating step of preheating the drive shaft with a small welding current.

7. The rivet welding method for the steel balance sheet and the aluminum alloy transmission shaft according to claim 4, characterized in that: in step S2, the pressure of the pre-pressing step is 3-8KN, and the time of the pre-pressing step is 300-1000 ms.

8. The rivet welding method for the steel balance sheet and the aluminum alloy transmission shaft according to claim 4, characterized in that: in step S3, the current of the welding process is 30-60KA, the time of the welding process is 70-150ms, and the pressure of the welding process is 3-8 KN.

9. The rivet welding method for the steel balance sheet and the aluminum alloy transmission shaft according to claim 4, characterized in that: in step S4, the pressure of the voltage stabilization process is 3-8KN, and the time of the voltage stabilization process is 300-1000 ms.

10. The rivet welding method for the steel balance sheet and the aluminum alloy transmission shaft according to claim 6, characterized in that: in the step preheating process, the pressure of the preheating process is 3-8KN, the time of the preheating process is 60-120ms, and the current of the preheating process is 6-15 KA.

Technical Field

The invention belongs to the technical field of balance sheet welding, and particularly relates to a rivet welding system and method for a steel balance sheet and an aluminum alloy transmission shaft.

Background

After the automobile transmission shaft assembly is subjected to dynamic balance experiments, the unbalance amount of the automobile transmission shaft assembly is repaired by a method of balancing weight on a light edge on the transmission shaft assembly, so that the residual unbalance amount of the automobile transmission shaft assembly reaches the allowable range of products. The light-side weighting method of the assembly is realized by using a balancing sheet. The automobile transmission shaft is made of aluminum alloy materials at present, and conforms to the trend of light weight development of automobiles. For heavy trucks, the wall thickness of the adopted aluminum alloy transmission shaft is thicker and is generally larger than 5mm, the size of the balance sheet required by the aluminum alloy balance sheet is larger, and the requirement of locally increasing the balance weight is difficult to meet, so that the dynamic balance of the aluminum alloy transmission shaft is realized by increasing the balance weight by the steel balance sheet. At present, an arc welding method is generally adopted for connecting an aluminum alloy transmission shaft and a steel balance sheet, and the welding method has the following defects: firstly, the physical and chemical properties of aluminum and steel are greatly different, the solubility of Fe in solid Al is extremely low, Fe is almost insoluble in Al at room temperature, and brittle intermetallic compounds such as FeAl, Fe2Al, Fe2Al5, FeAl3 and the like appear on a joint interface layer in the post-welding cooling process, so that the bonding interface is particularly fragile, and the welding strength of a steel balance sheet and an aluminum alloy transmission shaft is directly reduced; secondly, by adopting an arc welding method, the balance sheet and the transmission shaft have certain burning loss problems and relatively low production efficiency, and the welding strength and the production efficiency of the steel balance sheet and the aluminum alloy transmission shaft are difficult to guarantee due to the problems.

Disclosure of Invention

In view of the above, the present invention aims to provide a rivet welding system and method for a steel balance sheet and an aluminum alloy transmission shaft, so as to solve the problems of low welding strength and low production efficiency of the steel balance sheet and the aluminum alloy transmission shaft in the existing arc welding method.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention provides a rivet welding system for a steel balance sheet and an aluminum alloy transmission shaft, which is characterized in that: the welding device comprises a projection welding machine, an upper electrode and a lower electrode, wherein the upper electrode and the lower electrode are installed in a matched mode with the projection welding machine, the lower end face of the upper electrode is an arc-shaped face matched with an aluminum alloy transmission shaft, the upper end face of the lower electrode is an arc-shaped face matched with a steel balance sheet, the steel balance sheet is arranged on the arc-shaped face of the lower electrode, and the transmission shaft is arranged between the steel balance sheet and the upper electrode.

Furthermore, an installation through hole matched with the nail column of the aluminum alloy rivet is formed in the steel balance sheet, the aluminum alloy rivet is installed on the inner side of the installation through hole, the upper end face of the nail column of the aluminum alloy rivet is in tight contact with the aluminum alloy transmission shaft, the nail cap of the aluminum alloy rivet is in tight contact with the lower electrode, and the height of the aluminum alloy rivet column protruding out of the upper surface of the steel balance sheet is 40% -60% of the diameter of the aluminum alloy rivet column.

Further, the up end of steel balance piece is the arcwall face with aluminum alloy transmission shaft external diameter assorted, the steel balance piece down the terminal surface be with bottom electrode up end assorted arcwall face, both sides all are equipped with spacing boss on the bottom electrode, the distance between two spacing bosses and the width phase-match of steel balance piece.

The invention also provides a rivet welding method of the steel balance sheet and the aluminum alloy transmission shaft, and the rivet welding system of the steel balance sheet and the aluminum alloy transmission shaft is applied. The method comprises the following steps:

s1, mounting the aluminum alloy rivet on the inner side of the mounting through hole of the steel balance sheet, placing the steel balance sheet and the aluminum alloy rivet on the arc-shaped surface of the lower electrode, and placing the aluminum alloy transmission shaft on the steel balance sheet;

s2, a pre-pressing procedure, namely driving the upper electrode to press downwards, and pre-pressing the aluminum alloy transmission shaft and the aluminum alloy rivet;

s3, welding, namely electrifying the upper electrode and the lower electrode after the pre-pressing is finished, and performing welding operation;

s4, a voltage stabilization procedure, wherein after the welding is finished, the upper electrode pressure is maintained for a certain time;

and S5, lifting the upper electrode, and taking out the welded aluminum alloy transmission shaft.

Further, before the step S1, the aluminum alloy rivet and the aluminum alloy propeller shaft are chemically cleaned.

Further, before the step S3, a preheating step of preheating the drive shaft with a small welding current is provided.

Further, in step S2, the pressure of the pre-pressing step is 3-8KN, and the time of the pre-pressing step is 300-.

Further, in step S3, the current of the welding process is 30-60KA, the time of the welding process is 70-150ms, and the pressure of the welding process is 3-8 KN.

Further, in step S4, the pressure of the voltage stabilizing process is 3-8KN, and the time of the voltage stabilizing process is 300-.

Furthermore, in the step preheating process, the pressure of the preheating process is 3-8KN, the time of the preheating process is 60-120ms, and the current of the preheating process is 6-15 KA.

Compared with the prior art, the rivet welding system and method for the steel balance sheet and the aluminum alloy transmission shaft have the following beneficial effects:

(1) according to the rivet welding system and method for the steel balance sheet and the aluminum alloy transmission shaft, the steel balance sheet and the aluminum alloy transmission shaft are welded by using a rivet welding method, so that the welding strength and the production efficiency of the steel balance sheet and the aluminum alloy transmission shaft are improved.

(2) According to the rivet welding system and method for the steel balance sheet and the aluminum alloy transmission shaft, a small welding current is firstly used in the preheating process, and residual oil stains on the surface of the aluminum alloy are removed by using heat generated by the small current, so that the welding quality is guaranteed.

(3) According to the rivet welding system and method for the steel balance sheet and the aluminum alloy transmission shaft, the height of the aluminum alloy rivet column protruding out of the upper surface of the steel balance sheet is 40% -60% of the diameter of the aluminum alloy rivet column, welding strength is guaranteed, and a gap between the steel balance sheet and the aluminum alloy transmission shaft after welding is finished due to the fact that the rivet column is too long is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a system installation structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a partial structure of a system installation according to an embodiment of the present invention;

FIG. 3 is a schematic view of a partial structure of an aluminum alloy transmission shaft according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of an aluminum alloy rivet according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of an aluminum alloy transmission shaft according to an embodiment of the present invention;

FIG. 6 is a schematic sectional view of an aluminum alloy transmission shaft before welding according to an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a welded aluminum alloy transmission shaft according to an embodiment of the present invention;

fig. 8 is a schematic view of a rivet welding process according to an embodiment of the present invention.

Description of reference numerals:

1-projection welding machine; 2-an upper electrode; 3-a lower electrode; 4-aluminum alloy transmission shaft; 5-a steel balance sheet; 6-aluminum alloy rivets; 301-limit boss; 501-installing a through hole; 601-nail column; 602-nail cap.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The first embodiment is as follows:

as shown in fig. 1 to 5, this embodiment provides a rivet welding system for a steel balance sheet 5 and an aluminum alloy transmission shaft 4, which includes a projection welding machine 1, an upper electrode 2 and a lower electrode 3 installed in cooperation with the projection welding machine 1, wherein the lower end surface of the upper electrode 2 is an arc surface matched with the aluminum alloy transmission shaft 4, the upper end surface of the lower electrode 3 is an arc surface matched with the steel balance sheet 5, the arc surface of the lower electrode 3 is provided with the steel balance sheet 5, and the transmission shaft is disposed between the steel balance sheet 5 and the upper electrode 2. The installation through hole 501 matched with the aluminum alloy rivet 6 stud 601 is formed in the steel balance sheet 5, the aluminum alloy rivet 6 is installed on the inner side of the installation through hole 501, the upper end face of the aluminum alloy rivet 6 stud 601 is in close contact with the aluminum alloy transmission shaft 4, the aluminum alloy rivet 6 nut 602 is in close contact with the lower electrode 3, the height of the aluminum alloy rivet 6 stud 601 protruding out of the upper surface of the steel balance sheet 5 is 40% -60% of the diameter of the aluminum alloy rivet 6 stud 601, welding strength is guaranteed, and a gap can not exist between the steel balance sheet 5 and the aluminum alloy transmission shaft 4 after welding is finished due to the fact that the stud 601 is too long. The upper end face of the steel balance sheet 5 is an arc-shaped face matched with the outer diameter of the aluminum alloy transmission shaft 4, and the lower end face of the steel balance sheet 5 is an arc-shaped face matched with the upper end face of the lower electrode 3.

As shown in fig. 6 and 7, in practical use, the aluminum alloy rivet 6 stud 601 is installed inside the installation through hole 501 of the steel balance sheet 5, the diameter of the installation through hole 501 is matched with the diameter of the stud 601 of the aluminum alloy rivet 6, so as to prevent the aluminum alloy rivet 6 from shaking, the steel balance sheet 5 is placed on the lower electrode 3, the balance sheet is ensured to be just clamped between the limiting bosses 301 at the two sides of the lower electrode 3, the limiting bosses 301 play a limiting role in balance and prevent the shaking, the aluminum alloy transmission shaft 4 is placed on the steel balance sheet 5, the upper electrode 2 is pressed downwards, so as to ensure that the aluminum alloy rivet 6 stud 601 is tangent to the surface of the aluminum alloy transmission shaft 4, and the upper end surface of the steel balance sheet 5 is concentric with the outer surface of the aluminum alloy transmission shaft 4, then welding is carried out, the lower end face of the upper electrode 2 is an arc-shaped face matched with the aluminum alloy transmission shaft 4, and the arc-shaped face plays a role in preventing the aluminum alloy transmission shaft 4 from shaking. The upper electrode 2 and the lower electrode 3 are copper material structures, when welding, the current of the post 601 of the aluminum alloy rivet 6 and the contact position of the aluminum alloy transmission shaft 4 is the biggest, in addition, under the effect that the upper electrode 2 is pressed down, the heat that the post 601 and the contact position of the aluminum alloy transmission shaft 4 produce is the most, melt the position of the protruding balance sheet of the post 601 and form the nugget with the transmission shaft, the up end of the steel balance sheet 5 is the arc surface with 4 assorted aluminum alloy transmission shafts, 5 up ends of the steel balance sheet can be laminated on the tight surface of the aluminum alloy transmission shaft 4 after welding, prevent the steel balance sheet 5, the welding strength is improved, the operation is simple and convenient, and the working efficiency is improved.

Example two:

as shown in fig. 8, the embodiment provides a rivet welding method for a steel balance sheet 5 and an aluminum alloy transmission shaft 4, and the above rivet welding system for a steel balance sheet 5 and an aluminum alloy transmission shaft 4 is applied. The method comprises the following steps:

the diameter of the nail column 601 of the aluminum alloy rivet 6 is 6mm, the height is 6.5mm, the thickness of the steel balance sheet 5 is 4mm, and the outer diameter of the aluminum alloy transmission shaft 4 is 140mm, and the thickness is 5 mm.

The method comprises the following steps of carrying out chemical cleaning on the aluminum alloy rivet 6 and the aluminum alloy transmission shaft 4 before welding, washing with alkali by using a 7% sodium hydroxide solution for 5 minutes, passivating in a 30% nitric acid solution for 3 minutes after washing with water, washing with water and drying by blowing, wiping the surfaces of the steel balance sheet 5 and the aluminum alloy transmission shaft 4 by using alcohol, removing oil stains on the surfaces, and completing the rivet welding experiment of the steel balance sheet 5 and the aluminum alloy transmission shaft 4 within 24 hours. The surface of the aluminum alloy structural part is provided with a layer of compact oxide film, the oxide film has great influence on the bonding strength of the rivet welding spot, the surfaces of the aluminum rivet and the aluminum alloy transmission shaft 4 are chemically cleaned before the rivet welding experiment, the oxide film and oil stains on the surfaces can be removed, and the welding strength and quality are further ensured.

S1, an aluminum alloy rivet 6 is installed inside the installation through hole 501 of the steel balance sheet 5, and the length of the nail post 601 protruding out of the steel balance sheet 5 is 2.5mm and is 41.67% of the diameter of the nail post. The aluminum alloy rivet 6 is ensured to be tightly contacted with the steel balance sheet 5, the steel balance sheet 5 and the aluminum alloy rivet 6 are placed on the arc-shaped surface of the lower electrode 3, the balance sheet is ensured to be just clamped between the limiting bosses 301 on the two sides of the lower electrode 3, and the aluminum alloy transmission shaft 4 is placed on the steel balance sheet 5; then, the position of the aluminum alloy transmission shaft 4 needing to be added with the balance weight is adjusted to be in contact with the nail post 601, and a welding experiment is prepared.

S2, a pre-pressing procedure, namely driving the upper electrode 2 to press downwards, and pre-pressing the aluminum alloy transmission shaft 4 and the aluminum alloy rivet 6, wherein the pre-pressing time is 400 plus 600ms, and the pre-pressing pressure is 3-5 KN; under the pressure action of the upper electrode 2, the aluminum alloy rivet 6 on the steel balance sheet 5 is tightly pressed with the aluminum alloy transmission shaft 4, so that the aluminum alloy rivet 6 and the aluminum alloy transmission shaft 4, the lower electrode 3 and the aluminum alloy rivet 6 nut 602, and all contact surfaces of the upper electrode 2 and the aluminum alloy transmission shaft 4 are fully contacted, the pre-pressing can ensure that the contact position is in a good compression state, and the splashing and explosion points caused by overlarge welding resistance are avoided.

S3, after the pre-pressing process is finished, a preheating process is carried out, the upper electrode 2 and the lower electrode 3 are electrified, the pressure of the preheating process is 3-5KN, the time of the preheating process is 70-100ms, and the current of the preheating process is 6-8 KA; and removing oxides and residual oil stains on the surface of the aluminum alloy structural member by using heat generated by small current.

After the preheating process is finished, performing a welding process, wherein the pressure of the welding process is 3-5KN, the current of the welding process is 40-50KA, and the time of the welding process is 80-120 ms;

s4, after the welding process is finished, performing a voltage stabilization process, maintaining the pressure of the upper electrode 2 for a certain time, wherein the time of the voltage stabilization process is 300-600ms, and the pressure of the voltage stabilization process is 3-5 KN; after the electrification is finished, the molten aluminum alloy starts to be cooled and crystallized under the condition of cooling water, electrode and air heat dissipation, the internal aluminum alloy shrinks, and the internal defects can be reduced and the residual stress can be reduced under the continuous action of the pressure of the upper electrode 2.

And S5, lifting the upper electrode 2, and taking out the welded aluminum alloy transmission shaft 4.

Example three:

the embodiment provides a rivet welding method for a steel balance sheet 5 and an aluminum alloy transmission shaft 4, and the rivet welding system for the steel balance sheet 5 and the aluminum alloy transmission shaft 4 is applied. The method comprises the following steps:

the diameter of the nail column 601 of the aluminum alloy rivet 6 is 8mm, the height is 7.5mm, the thickness of the steel balance sheet 5 is 4mm, two installation through holes 501 can be arranged on the central bisector of the steel balance sheet 5, and the outer diameter of the aluminum alloy transmission shaft is 180mm, and the thickness is 6 mm.

The method comprises the following steps of carrying out chemical cleaning on the aluminum alloy rivet 6 and the aluminum alloy transmission shaft 4 before welding, washing with alkali by using a 7% sodium hydroxide solution for 5 minutes, passivating in a 30% nitric acid solution for 3 minutes after washing with water, washing with water and drying by blowing, wiping the surfaces of the steel balance sheet 5 and the aluminum alloy transmission shaft 4 by using alcohol, removing oil stains on the surfaces, and completing the rivet welding experiment of the steel balance sheet 5 and the aluminum alloy transmission shaft 4 within 24 hours. The surface of the aluminum alloy structural part is provided with a layer of compact oxide film, the oxide film has great influence on the bonding strength of the rivet welding spot, the surfaces of the aluminum rivet and the aluminum alloy transmission shaft 4 are chemically cleaned before the rivet welding experiment, the oxide film and oil stains on the surfaces can be removed, and the welding strength and quality are further ensured.

S1, respectively installing the two aluminum alloy rivets 6 on the inner sides of the two installation through holes 501 of the steel balance sheet 5, wherein the length of the nail post 601 protruding out of the steel balance sheet 5 is 3.5mm and is 43.75% of the diameter of the nail post. The aluminum alloy rivet 6 is ensured to be tightly contacted with the steel balance sheet 5, the steel balance sheet 5 and the aluminum alloy rivet 6 are placed on the arc-shaped surface of the lower electrode 3, the balance sheet is ensured to be just clamped between the limiting bosses 301 on the two sides of the lower electrode 3, and the aluminum alloy transmission shaft 4 is placed on the steel balance sheet 5; then, the position of the aluminum alloy transmission shaft 4 needing to be added with the balance weight is adjusted to be in contact with the nail post 601, and a welding experiment is prepared.

S2, a pre-pressing procedure, namely driving the upper electrode 2 to press downwards, and pre-pressing the aluminum alloy transmission shaft 4 and the aluminum alloy rivet 6, wherein the pre-pressing time is 600 plus 800ms, and the pre-pressing pressure is 5-6 KN; under the pressure action of the upper electrode 2, the aluminum alloy rivet 6 on the steel balance sheet 5 is tightly pressed with the aluminum alloy transmission shaft 4, so that the aluminum alloy rivet 6 and the aluminum alloy transmission shaft 4, the lower electrode 3 and the aluminum alloy rivet 6 nut 602, and all contact surfaces of the upper electrode 2 and the aluminum alloy transmission shaft 4 are fully contacted, the pre-pressing can ensure that the contact position is in a good compression state, and the splashing and explosion points caused by overlarge welding resistance are avoided.

S3, after the pre-pressing process is finished, a preheating process is carried out, the upper electrode 2 and the lower electrode 3 are electrified, the pressure of the preheating process is 5-6KN, the time of the preheating process is 70-100ms, and the current of the preheating process is 7-9 KA; and removing oxides and residual oil stains on the surface of the aluminum alloy structural member by using heat generated by small current.

After the preheating process is finished, performing a welding process, wherein the pressure of the welding process is 5-6KN, the current of the welding process is 45-50KA, and the time of the welding process is 80-120 ms;

s4, after the welding process is finished, performing a voltage stabilization process, maintaining the pressure of the upper electrode 2 for a certain time, wherein the time of the voltage stabilization process is 400-600ms, and the pressure of the voltage stabilization process is 5-6 KN; after the electrification is finished, the molten aluminum alloy starts to be cooled and crystallized under the condition of cooling water, electrode and air heat dissipation, the internal aluminum alloy shrinks, and the internal defects can be reduced and the residual stress can be reduced under the continuous action of the pressure of the upper electrode 2.

And S5, lifting the upper electrode 2, and taking out the welded aluminum alloy transmission shaft 4.

Those of ordinary skill in the art will appreciate that the elements and method steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of clearly illustrating the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the several embodiments provided in the present application, it should be understood that the disclosed method and system may be implemented in other ways. For example, the above described division of elements is merely a logical division, and other divisions may be realized, for example, multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not executed. The units may or may not be physically separate, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.