A projection welding electrode

Abstract

The application relates to the technical field of welding, and particularly discloses a projection welding electrode which comprises corresponding upper and lower electrode bases, the upper electrode is provided with an electrode cavity, a through hole which is in communication with the electrode cavity is formed in the side wall of the upper electrode, the upper electrode is connected with an air pipe, the through hole is in communication with the air pipe, and the air pipe is communicated with an air pump at the other end far from the through hole. The nut to be welded is arranged on the lower electrode base, before welding, the air pump is started to convey compressed gas into the air pipe, the compressed gas enters the electrode cavity through the through hole and blows downwards from the electrode cavity to the nut, the fine and small slag or sundries existing on the nut is blown away, and then subsequent welding operation is carried out. The fine and small slag or sundries existing on the nut is blown away through blowing before welding, so that the fine and small slag or sundries does not affect the welding quality during welding.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, specifically to a projection welding electrode. Background Technology

[0002] With the rapid development of the automotive industry, high-level and high-speed automobile production is the future trend. Nut projection welding is widely used in body manufacturing. The welding strength of nuts, whether in terms of torque or pull-out force, can meet the requirements of various manufacturers. With the continuous improvement of production and manufacturing level, the concentricity standard of nuts and bottom holes in nut projection welding has also been raised by machine shops.

[0003] To improve the accuracy of nut projection welding positioning, Chinese utility model patent with publication number "CN219336349U" discloses a nut projection welding electrode structure. It includes a lower electrode seat, a lower electrode cover mounted on one end of the lower electrode seat, a limiting pin slidably connected inside the lower electrode seat and penetrating the lower electrode cover, a limiting post fixedly connected to one end of the limiting pin inside the lower electrode seat, a first compression spring installed between the limiting post and the lower electrode seat, and a limiting structure for restricting the limiting pin inside the lower electrode cover. This effectively solves the problem that the lower electrode cover gradually thins due to grinding, causing the positioning pin to tilt and fluctuate during rising and falling, ultimately leading to misalignment between the welded nut and the bottom hole. It also effectively avoids the problem of nut misalignment caused by the thinning of the lower electrode cover in existing structures. During welding, the metal workpiece is first placed on the lower electrode cover, and then the nut is placed on the metal workpiece. The upper electrode is then activated to work downwards, and the nut is welded onto the metal workpiece. During welding, there may be fine slag or other debris on the nut. These fine slag or other debris can increase the contact resistance, cause uneven current distribution, form slag inclusions, damage the surface flatness, and cause fluctuations in welding quality, thus affecting the welding quality. Utility Model Content

[0004] The purpose of this invention is to provide a projection welding electrode to solve the problem that fine slag or other debris may exist on the nut during welding, which affects the welding quality.

[0005] To address the above issues, the following technical solution is provided: A projection welding electrode includes a corresponding upper electrode and a lower electrode seat. The upper electrode has an electrode cavity, and a through hole communicating with the electrode cavity is opened on the side wall of the upper electrode. The upper electrode is connected to an air pipe, and the through hole communicates with the air pipe. The other end of the air pipe away from the through hole is connected to an air pump.

[0006] The basic principle of the above technical solution is as follows: the nut to be welded is placed on the lower electrode seat. Before welding, the air pump is started to deliver compressed gas into the air pipe. The compressed gas enters the electrode cavity through the through hole and blows downwards from the electrode cavity towards the nut, blowing away the fine slag or debris on the nut, and then the subsequent welding operation is carried out.

[0007] The beneficial effects of the above technical solution are as follows: Compared with the existing method of placing the nut to be welded on the lower electrode seat and directly starting the upper electrode and lower motor seat to weld the nut, this technical solution is equipped with an air pipe device on the upper electrode that can blow air to remove slag from the nut, blowing away the fine slag or debris on the nut, thus avoiding the fine slag or debris affecting the welding quality during welding.

[0008] Furthermore, a throttle valve connects the through-hole to the air tube. By controlling the opening and closing of the throttle valve, it is convenient to control whether compressed gas is delivered into the electrode cavity through the air tube.

[0009] Furthermore, the through hole has threads on its wall, and the throttle valve is threadedly connected to the through hole. This threaded connection facilitates the disassembly and installation of the throttle valve.

[0010] Furthermore, the electrode cavity is vertically arranged at the center of the upper electrode.

[0011] Furthermore, the lower electrode holder is provided with an electrode positioning pin, which is correspondingly positioned to the electrode cavity of the upper electrode. Before welding, the nut to be welded is fitted onto the electrode positioning pin to prevent it from being displaced by air blowing.

[0012] Furthermore, the upper electrode and lower electrode holder are made of chromium-zirconium-copper material. Chromium-zirconium-copper material has high hardness, strong heat resistance, and balanced electrical conductivity, which can enhance the service life of the electrodes. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0014] The reference numerals in the accompanying drawings include: upper electrode 1, lower electrode seat 2, electrode cavity 3, through hole 4, air tube 5, throttle valve 6, and electrode positioning pin 7. Detailed Implementation

[0015] The following detailed description illustrates the specific implementation method: The basic implementation examples are as follows: Figure 1 As shown: A projection welding electrode, such as Figure 1As shown, the device includes a corresponding upper electrode 1 and a lower electrode holder 2. The upper electrode 1 has a vertically arranged electrode cavity 3 in its center. A through hole 4 communicating with the electrode cavity 3 is opened on the side wall of the upper electrode 1. The wall of the through hole 4 is threaded. An air pipe 5 is connected to the upper electrode 1. The through hole 4 communicates with the air pipe 5. A throttle valve 6 connects the through hole 4 and the air pipe 5, and the throttle valve 6 is threadedly connected to the through hole 4. An air pump (not shown in the figure) is connected to the other end of the air pipe 5 away from the through hole 4. An electrode positioning pin 7 is provided on the lower electrode holder 2, corresponding to the electrode cavity 3 of the upper electrode 1. The upper electrode 1 and the lower electrode holder 2 are made of chromium-zirconium-copper material.

[0016] The specific implementation process is as follows: The nut to be welded is fitted onto the electrode positioning pin 7 on the lower electrode holder 2. Before welding, the air pump is started and the throttle valve 6 is opened, allowing compressed gas to be supplied from the air pipe 5 into the through hole 4. The compressed gas enters the electrode cavity 3 through the through hole 4 and blows downwards from the electrode cavity 3 towards the nut, blowing away any fine debris or impurities present on the nut. Then, the upper electrode 1 and the lower electrode holder 2 are activated to work together to weld the nut. Blowing away any fine debris or impurities on the nut before welding prevents these impurities from affecting the welding quality.

[0017] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A projection welding electrode, comprising a corresponding upper electrode and a lower electrode holder, characterized in that: The upper electrode is provided with an electrode cavity, and a through hole communicating with the electrode cavity is opened on the side wall of the upper electrode. The upper electrode is connected to an air pipe, and the through hole is connected to the air pipe. The other end of the air pipe away from the through hole is connected to an air pump.

2. The projection welding electrode according to claim 1, characterized in that: A throttle valve is connected between the through hole and the air pipe.

3. The projection welding electrode according to claim 2, characterized in that: The wall of the through hole is threaded, and the throttle valve is threadedly connected to the through hole.

4. A projection welding electrode according to claim 3, characterized in that: The electrode cavity is vertically arranged at the center of the upper electrode.

5. The projection welding electrode according to claim 1, characterized in that: The lower electrode holder is provided with an electrode positioning pin, which is configured to correspond to the electrode cavity of the upper electrode.

6. The projection welding electrode according to claim 1, characterized in that: The upper electrode and lower electrode holder are made of chromium zirconium copper material.

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