TWM627598U - Welding electrode structure of electric resistance welding machine - Google Patents

Abstract

The present invention relates to a welding electrode structure of a resistance welding machine, which is used to weld an electrical contact and an object to be welded, and connect the electrical contact and the object to be welded through a hard solder. The welding electrode structure includes an upper electrode, which is made of an alloy material with a melting point of not lower than 2500°C, and the upper electrode is in contact with the electrical contact; and a lower electrode, which is made of an alloy material with a melting point of not lower than 2500°C , and make the lower electrode in contact with the object to be soldered; when the upper electrode contacts the electrical contact, and the lower electrode contacts the object to be soldered, and the lower electrode corresponds to the hard solder, by the resistance welding The welding current output by the machine passes through the upper electrode and the lower electrode, melts the hard solder, and makes the electrical contact and the object to be welded become connected.

Description

Welding electrode structure of resistance welding machine

This creation relates to a welding electrode structure of a resistance welding machine. The welding operation is performed by the resistance welding machine, so that the electrical contact and the object to be welded become connected.

In general, electrical contacts have been widely used in electrical products such as high-current, high-load fuseless switches, electromagnetic switches, and circuit-breakers. At present, a resistance welding machine is used, and the electrical contact is combined with the object to be welded by the upper electrode and the lower electrode; when the resistance welding machine outputs the welding current, and the current passes through the upper electrode and the lower electrode to generate resistance heat, so that the The braze between the electrical contacts and the object to be soldered melts to join. However, in order to avoid pressure damage to the electrical contact during the welding process, the upper electrode uses graphite with soft hardness as the electrode material; meanwhile, the lower electrode also uses graphite with soft hardness as the electrode material.

However, the resistance value of graphite electrodes varies greatly in different temperature environments, resulting in unstable welding current. We must manually control the output time of the current and visually observe the degree of melting of the hard solder for welding, and the high temperature generated during the welding process makes the graphite electrode The consumption rate is fast, and the graphite electrodes must be replaced frequently. Conducive to automated continuous production.

In order to overcome the defects caused by the aforementioned graphite electrodes, the upper electrode and the lower electrode are changed to use high temperature-resistant and wear-resistant metal electrodes for automatic continuous production. But it is worth noting that when the material used for the electrical contact is silver-nickel alloy, silver oxide or silver-graphite alloy, and its size is small, compared with the metal electrode, due to the resistance value of the electrical contact and the The high temperature resistance is low, which will make the hard solder between the electrical contact and the object to be welded during the melting process, due to the high resistance value of the upper electrode, resulting in high temperature resistance heat, causing the surface of the electrical contact 40 to melt/ Burning occurs (as in the photo of FIG. 1A ), and the upper electrode 41 and the lower electrode 42 are deformed due to the high temperature of welding (as in the photo of FIG. 1B ); these deficiencies in the prior art need to be overcome, thus completing the present invention.

The main purpose of this creation is to provide a welding electrode structure for a resistance welding machine. The output welding current of the resistance welding machine is used to generate resistance heat to melt the hard solder. During the melting process, only the lower electrode generates high-temperature resistance heat, while the upper electrode generates resistance heat. High-temperature resistance heat will not be generated to avoid melting/burning of electrical contacts, and to prevent deformation of upper and lower electrodes due to high welding temperatures.

In order to achieve the above-mentioned effect and purpose, the welding electrode structure of the resistance welding machine of the present invention uses the resistance welding machine to weld an electrical contact and an object to be welded, and joins the electrical contact and the object to be welded through a hard solder. together, and the hard solder is disposed between the electrical contact and the object to be soldered between; the electrical contact is silver-nickel alloy, silver oxide or silver-graphite alloy; the object to be welded is a metal material. The welding electrode structure of the resistance welding machine includes an upper electrode, which is made of an alloy material with a melting point of not lower than 2500°C, and the upper electrode is in contact with the electrical contact, so that the welding current of the resistance welding machine can pass; and The lower electrode is made of an alloy material with a melting point of not lower than 2500°C, and the lower electrode is in contact with the object to be welded, so that the welding current of the resistance welding machine can pass through; the cross-sectional area of the upper electrode is the sectional area of the lower electrode 2.5~2.7 times; and the cross-sectional area of the lower electrode is 0.65~1.5 times the welding area of the electrical contact; when the upper electrode contacts the electrical contact, and the lower electrode contacts the object to be welded, and the lower electrode corresponds to When the hard solder is used, resistance heat is generated by the welding current output by the resistance welding machine, so that the hard solder is melted, so as to accelerate the melting of the hard solder, so that the electrical contact and the object to be welded are connected.

In order to further understand the features and technical content of this creation, please refer to the following detailed descriptions and accompanying drawings of this creation. However, the accompanying drawings are for reference and illustration only, and are not intended to limit the scope of patent protection of this creation. .

(this creation)

10: Resistance welding machine

11: Electrical contacts

12: Objects to be welded

13: Hard solder

14, 15: Electrode sleeve

20, 30: Welding electrode structure of resistance welding machine

21, 21a: Upper electrode

22, 22a: lower electrode

23, 24: Electrode cooler

(prior art)

40: Electrical contacts

41: Upper electrode

42: Lower electrode

Figure 1A shows a photograph of electrical contact burnout using a conventional electrode structure.

Figure 1B shows a photograph of the deformation of the upper electrode caused by the use of a conventional electrode structure.

FIG. 2 is a schematic diagram of the inventive welding electrode structure installed on the resistance welding machine.

Figure 3 is a cross-sectional view of the creation; wherein, the upper electrode and the lower electrode are round rods.

FIG. 4 is a perspective view of FIG. 3 .

Figure 5 is a three-dimensional view of the creation; wherein, the upper electrode and the lower electrode are square rods.

Figure 6 is a photograph showing that the electrical contacts did not melt/burn out after the soldering test.

Figure 7 is a photo of the welding test for this creation. During the melting process of the hard solder, only the lower electrode generates high-temperature resistance heat, while the upper electrode does not generate high-temperature resistance heat.

Please refer to FIG. 2 to FIG. 7 , the welding electrode structure 20 of the resistance welding machine of the present invention utilizes the conventional resistance welding machine 10 to perform welding operations, so that the welding electrode structure 20 performs welding on an electrical contact 11 and an object to be welded 12 . Soldering, and connecting the electrical contact 11 to the object to be soldered 12 through a hard solder 13 , and the hard solder 13 is disposed between the electrical contact 11 and the object to be soldered 12 . The electrical contact 11 is silver-nickel alloy, silver oxide or silver-graphite alloy. The welded object 12 is a metal material.

Furthermore, the thickness of the electrical contact 11 is 1-3 mm, and the welding area is in the range of 15-50 mm ² . The thickness of the welded object 12 is 1.5-3 mm.

In addition, the electrical contact 11 , the object to be soldered 12 and the hard solder 13 described in this work are all commercially available products, and will not be described in detail here. In short, the silver-nickel alloy electrical contact material used in the electrical contact 11 has a nickel content of less than 40% by weight; the silver oxide electrical contact used in the electrical contact For the point material, the weight percent of the oxide component is less than 20%; for the silver-graphite alloy (ie silver carbon) electrical contact material used in the electrical contact, the weight percent of the carbon component is less than 5%. The welded object 12 is copper or copper alloy. The hard solder 13 is silver solder or copper solder.

As shown in FIGS. 2 to 4 , the resistance welding machine 10 has a pair of separate electrode sleeves 14 , 15 . The welding electrode structure 20 of the resistance welding machine of the present invention includes an upper electrode 21 and a lower electrode 22 . The upper electrode 21 is an alloy material whose melting point is not lower than 2500°C, and its resistance value is greater than the resistance value of the electrical contact 11 and the hard solder 13; and the upper electrode 21 is in contact with the electrical contact 11, The welding current of the resistance welding machine 10 is passed through.

The lower electrode 22 is an alloy material whose melting point is not lower than 2500°C, and its resistance value is greater than the resistance value of the electrical contact 11 and the hard solder 13; The welding current of this resistance welding machine 10 is passed.

The cross-sectional area of the upper electrode 21 is 2.5-2.7 times the cross-sectional area of the lower electrode 22, and the cross-sectional area of the lower electrode 22 is 0.65-1.5 times the welding area of the electrical contact 11; when the upper electrode 21 contacts the electrical contact 11, and when the lower electrode 22 contacts the object to be welded 12, and the lower electrode 22 corresponds to the hard solder 13, the resistance heat is generated by the output welding current of the resistance welding machine 10, so that the lower electrode 22 generates a high temperature, using In order to accelerate the melting of the hard solder 13 , the electrical contact 11 and the object to be soldered 12 are connected.

In addition, the lengths of the upper electrode 21 and the lower electrode 22 are both 5-20 mm.

Furthermore, the upper electrode 21 and the lower electrode 22 are respectively connected with an electrode cooler 23, 24, and the electrode coolers 23, 24 are respectively installed in the electrode sleeves 14, 15 of the resistance welding machine 10; When the resistance welding machine 10 provides cooling water to the electrode coolers 23 and 24 , the upper electrodes 21 and the lower electrodes 22 can be dissipated.

In the present invention, the upper electrode 21 and the lower electrode 22 can be round rods ( FIG. 4 ) or square rods ( FIG. 5 ). As shown in FIG. 2 and FIG. 5 , the components of the welding electrode structure 30 of the resistance welding machine are the same as those shown in FIG. 2 to FIG. 4 , and the same components are marked with the same component symbols. FIG. 5 shows the upper electrode 21 a and the The shape of the lower electrode 22a is a square bar. In addition, the electrode material of the upper electrodes 21, 21a is molybdenum alloy or tungsten alloy, and the electrode material of the lower electrodes 22, 22a is molybdenum alloy or tungsten alloy

In this creative example 1, an upper electrode 21 with a round bar diameter of 8 mm and a lower electrode 22 with a round bar diameter of 5 mm are prepared, and the material of the upper electrode 21 and the lower electrode 22 is molybdenum alloy, and its material melting point is 2623 ℃, while the cross-sectional area of the upper electrode 21 is 2.56 times the cross-sectional area of the lower electrode 22, and the cross-sectional area of the lower electrode 22 is 0.65 times the welding area of the electrical contact 11 For welding tests, please refer to the examples in Table 1 below. 1.

The electrical contact 11 used in the above embodiment 1 is silver oxide; the object to be soldered 12 is copper (red copper); and the hard solder 13 is silver solder.

In this creative example 2, an upper electrode 21a with a square bar size of 8x8mm and a lower electrode 22a with a square bar size of 5x5mm are prepared, and the material of the upper electrode 21a and the lower electrode 22a is molybdenum alloy, and the melting point of the material is 2623 ℃, while the cross-sectional area of the upper electrode 21a is 2.56 times the cross-sectional area of the lower electrode 22a, and the cross-sectional area of the lower electrode 22a is 0.83 times the welding area of the electrical contact 11, the welding test is carried out. Please refer to the implementation of the following table 1. Example 2.

The electrical contact 11 used in the above-mentioned Embodiment 2 is silver oxide; the soldered object 12 is copper (red copper); and the hard solder 13 is silver solder.

In this creative example 3, an upper electrode 21a with a square rod size of 9x9mm and a lower electrode 22a with a square rod size of 6x5mm are prepared, and the material of the upper electrode 21a and the lower electrode 22a is molybdenum alloy, and the melting point of the material is 2623 ℃, and the cross-sectional area of the upper electrode 21a is 2.7 times the cross-sectional area of the lower electrode 22a, and the cross-sectional area of the lower electrode 22a is 1 times the welding area of the electrical contact 11. For example, please refer to the examples in Table 1 below. 3.

The electrical contact 11 used in the above-mentioned Embodiment 3 is silver oxide; the object to be soldered 12 is copper (red copper); and the hard solder 13 is silver solder.

In this creative example 4, an upper electrode 21 with a round rod diameter of 8 mm and a lower electrode 22 with a round rod diameter of 5 mm are prepared, and the material of the upper electrode 21 and the lower electrode 22 is tungsten alloy, and its material melting point is 3422 ℃, and the cross-sectional area of the upper electrode 21 is 2.56 times the cross-sectional area of the lower electrode 22, and the cross-sectional area of the lower electrode 22 is 0.65 times the welding area of the electrical contact 11. For the welding test, please refer to the following Example 4 of Table 1.

The electrical contact 11 used in the above-mentioned Embodiment 4 is silver oxide; the soldered object 12 is copper (red copper); and the hard solder 13 is silver solder.

In this creative example 5, an upper electrode 21a with a square rod size of 8x8mm and a lower electrode 22a with a square rod size of 5x5mm are prepared, and the material of the upper electrode 21a and the lower electrode 22a is tungsten alloy, and the melting point of the material is 3422 ℃, while the cross-sectional area of the upper electrode 21a is 2.56 times the cross-sectional area of the lower electrode 22a, and the cross-sectional area of the lower electrode 22a is 0.83 times the welding area of the electrical contact 11, the welding test is carried out. Please refer to the implementation of the following table 1. Example 5.

The electrical contact 11 used in the above-mentioned Embodiment 5 is silver oxide; the object to be soldered 12 is copper (red copper); and the hard solder 13 is silver solder.

In this embodiment 6, the upper electrode 21a with a square rod size of 9x9mm and a lower electrode 22a with a square rod size of 6x5mm are prepared, and the material of the upper electrode 21a and the lower electrode 22a is tungsten alloy, and the melting point of the material is 3422°C At the same time, the cross-sectional area of the upper electrode 21a is 2.7 times the cross-sectional area of the lower electrode 22a, and the cross-sectional area of the lower electrode 22a is 1 times the welding area of the electrical contact 11. For example, please refer to Example 6 in Table 1 below. .

The electrical contact 11 used in the above embodiment 6 is silver oxide; the object to be soldered 12 is copper (red copper); and the hard solder 13 is silver solder.

Table 1 describes the welding test results of Example 1, Example 2, Example 3, Example 4, Example 5, and Example 6.

From the welding test results in Table 1, it can be known that the electrical contact 11, the upper electrodes 21, 21a, and the lower electrodes 22, 22a have no abnormality, that is, the electrical contact 11 is not melted/burned, as shown in FIG. 6 As shown in the photo.

In addition, the output welding current of the resistance welding machine 10 generates resistance heat, which melts the hard solder 13, and during the melting process, only the lower electrodes 22, 22a generate high-temperature resistance heat, while the upper electrodes 21, 21a do not generate heat. High temperature resistance heat (photograph in Figure 7). It can be seen that the present invention can avoid deformation of the upper electrodes 21 and 21a and the lower electrodes 22 and 22a.

In the welding test, the resistance welding machine 10 is used to output welding current, and the generated resistance heat melts the hard solder 13, because the electrical contact 11 and the resistance of the hard solder 13 are lower than the upper electrodes 21, 21a and the lower The resistance value of the electrodes 22, 22a, therefore, the hard solder 13 is transmitted through the high temperature resistance heat generated by the lower electrodes 22, 22a during the output time of the welding current for 3 seconds, and reach the melting temperature.

However, when the welding current is output for the same time of 3 seconds, the heating rate of the lower electrodes 22, 22a to generate resistance heat is higher than that of the upper electrodes 21, 21a. The resistance value of the lower electrodes 22, 22a rises rapidly. When the lower electrodes 22, 22a generate high temperature resistance heat transfer, the hard solder 13 reaches the melting temperature, and the temperature of the resistance heat generated by the upper electrodes 21, 22a will not cause the heat transfer. Melting/burning of electrical contacts 11 occurs.

Although this creation has been disclosed above with preferred embodiments, it is not intended to limit this creation. Anyone who is familiar with this technology can make some changes and modifications without departing from the spirit and scope of this creation. Therefore, this creation The scope of protection shall be determined by the scope of the appended patent application.

10: Resistance welding machine

11: Electrical contacts

12: Objects to be welded

13: Hard solder

14, 15: Electrode sleeve

20,30: Welding electrode structure of resistance welding machine

21, 21a: Upper electrode

22, 22a: lower electrode

23, 24: Electrode cooler

Claims (6)

A welding electrode structure of a resistance welding machine, the resistance welding machine uses the welding electrode structure to weld an electrical contact and an object to be welded, and the electrical contact and the object to be welded are joined by a hard solder, and The hard solder is arranged between the electrical contact and the object to be welded; the electrical contact is silver-nickel alloy, silver oxide or silver-graphite alloy; the object to be welded is a metal material; the welding electrode structure includes: An upper electrode, which is an alloy material with a melting point of not lower than 2500°C, and whose resistance value is greater than the resistance value of the electrical contact and the hard solder, and makes the upper electrode contact the electrical contact for the resistance The welding current of the welding machine is passed; and A lower electrode, which is an alloy material with a melting point of not lower than 2500°C, and whose resistance value is greater than the resistance value of the electrical contact and the hard solder, and makes the lower electrode contact the object to be welded for the resistance welding The welding current of the machine passes through; wherein the cross-sectional area of the upper electrode is 2.5~2.7 times the cross-sectional area of the lower electrode; and the cross-sectional area of the lower electrode is 0.65~1.5 times the welding area of the electrical contact; When the upper electrode contacts the electrical contact, the lower electrode contacts the object to be welded, and the lower electrode corresponds to the hard solder, the welding current output by the resistance welding machine passes through the upper electrode and the lower electrode, so that the The lower electrode generates a high temperature to accelerate the melting of the hard solder, so that the electrical contact and the object to be soldered become connected. The welding electrode structure of a resistance welding machine according to claim 1, wherein the shape of the upper electrode is a round bar or a square bar. The welding electrode structure of a resistance welding machine according to claim 1, wherein the lower The shape of the electrodes is round or square. The welding electrode structure of the resistance welding machine according to claim 1, wherein the upper electrode and the lower electrode are further provided with an electrode cooler respectively, and each of the electrode coolers is connected with the resistance welding machine. The welding electrode structure of the resistance welding machine according to claim 1, wherein the upper electrode is a molybdenum alloy or a tungsten alloy. The welding electrode structure of a resistance welding machine according to claim 1, wherein the lower electrode is a molybdenum alloy or a tungsten alloy.

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