CN115971652A - A kind of aluminum alloy busbar conductor and its manufacturing method - Google Patents

Abstract

The invention relates to the technical field of conductor welding, in particular to an aluminum alloy bus conductor and a manufacturing method thereof, wherein the manufacturing method of the aluminum alloy bus conductor comprises the following steps: butting and leveling a joint of the aluminum alloy bus conductor and the conductive pipe; riveting the butted part of the joint and the conductive tube by adopting a laser welding and welding wire adding mode, wherein the riveting point is not more than 3 in the circumferential direction of the butted surface; the joint and the conductive tube are welded by adopting a laser welding process, and during laser welding, the laser power is not less than 6kW, the spot diameter is 3-5 mm, the defocusing amount is-3-0 mm, and the welding speed is 2-2.4 m/min, so that the welding efficiency is improved, and the manufacturing cost is reduced.

Description

A kind of aluminum alloy busbar conductor and its manufacturing method

technical field

The invention relates to the technical field of conductor welding, in particular to an aluminum alloy bus conductor and a manufacturing method thereof.

Background technique

As a key component of high-voltage switch products, the bus conductor is connected to the contact seat through the contact finger to undertake the task of passing the current. The bus conductor usually adopts an aluminum alloy tubular structure, and is generally composed of a middle conductive tube and silver-plated solid joints at both ends. The conductive pipe and the joint are welded and connected. At present, TIG arc welding is usually used for the connection. As shown in Figure 1 and Figure 2, the conductive pipe 1 and the joints 2 at both ends are inserted through the seam structure and welded at the welding position 3 at the insertion point. The silver-plated surface 22 of the joint 2 is on the part of the joint with a smaller outer diameter away from the spigot. In order to ensure that the weld seam has sufficient strength, it is necessary to process the groove 11 and the bevel of the conductive pipe at both ends of the conductive pipe 1 and the joint 2 respectively. The groove of the joint is 21 to increase the melting area of the base metal and the amount of welding wire filling. The processing procedure is long, the efficiency is low, and the manufacturing cost is high. Moreover, the heat input of TIG welding is large, and the deformation of the joint after welding is large. In order to reduce the temperature rise of the welding base metal on the silver Influenced by the layer, it is necessary to increase the distance between the silver layer and the weld, that is, to increase the length of the solid joint, which further increases the manufacturing cost of the bus conductor. Therefore, it is necessary to improve the conductor manufacturing efficiency and reduce the manufacturing cost under the condition of not reducing the current flow capacity of the conductor.

Contents of the invention

The purpose of the present invention is to provide an aluminum alloy bus conductor manufacturing method to solve the problem of high cost of the current bus conductor manufacturing method; the present invention is also to provide an aluminum alloy bus conductor to solve the current bus conductor manufacturing high cost issue.

The technical scheme of the aluminum alloy bus bar conductor manufacturing method of the present invention is:

A method for manufacturing an aluminum alloy bus conductor, comprising the following steps: leveling a joint of an aluminum alloy bus conductor and a conductive tube; riveting the butt joint of the joint and the conductive tube by laser welding and adding welding wire, and There are no more than 3 riveting points in the direction; the joint and the conductive tube are welded by laser welding technology. During laser welding, the laser power is not less than 6kW, the spot diameter is 3-5mm, the defocus amount is -3-0mm, and the welding speed is 2- 2.4m/min.

Beneficial effects: the aluminum alloy busbar conductor is welded by the laser welding process, and pre-riveted by laser welding and adding welding wire before welding, so as to ensure the welding quality and reduce welding defects. At the same time, the welding speed is fast, compared with the existing technology Compared with TIG welding, it does not need to process the groove at the welding place, which improves the welding efficiency, and the laser welding energy is concentrated, and the heat-affected zone is small, which can reduce the welding deformation of the joint and the influence on the silver-plated area, which can effectively reduce the The length of the silver-plated joint reduces the manufacturing cost, and at the same time reduces the pollution of the welding process, which can realize the rapid replacement of conventional arc welding.

Further, during laser welding, oscillating laser welding is adopted, with an oscillating amplitude of 0.5-1 mm and an oscillating frequency of 250-300 Hz.

Beneficial effect: the use of oscillating laser welding is beneficial to reduce air holes.

Further, when the joint and the conductive pipe are butted together, the joint and the conductive pipe are made to have an interference fit.

Beneficial effect: it is beneficial to increase the contact area between the joint and the conductive pipe, and increase the flow area and capacity.

Further, the interference is 0.1-0.3mm.

Beneficial effect: ensuring reliable contact and facilitating assembly.

Further, before riveting, the joint and the part of the conductive pipe to be welded are fixed by a jig and placed on the rotating frame, and the rotating frame drives the weldment to rotate at a constant speed.

Beneficial effect: the workpiece to be welded is positioned and driven by the fixture and the rotating frame, which facilitates the welding operation.

Further, the welding start and end are misaligned.

Beneficial effect: the welding start position and the end position are staggered mutually, which is beneficial to guarantee the welding quality.

Furthermore, a welding tracking system is used in conjunction with laser welding.

Beneficial effect: it is beneficial to adapt to the welding gap and ensure the welding quality.

The technical scheme of the aluminum alloy busbar conductor of the present invention is:

An aluminum alloy busbar conductor comprises a conductive pipe and a joint, the conductive pipe and the joint are connected by welding, and the weld seam between the conductive pipe and the joint is a weld seam formed by laser welding.

Beneficial effects: the welding efficiency is improved, the manufacturing cost is reduced, and the pollution in the welding process is reduced by adopting the laser welding process to weld the aluminum alloy busbar conductor.

Further, the conductive pipe is in interference fit with the joint.

Beneficial effect: it is beneficial to increase the contact area between the joint and the conductive pipe, and increase the flow area and capacity.

Description of drawings

FIG. 1 is a schematic structural view of a bus conductor in the prior art;

Fig. 2 is the structural representation that the conductive tube in Fig. 1 is separated from the joint;

Fig. 3 is the schematic structural view of the connection between the conductive pipe and the joint of the aluminum alloy busbar conductor of the present invention;

Fig. 4 is the structural representation of the joint among Fig. 3;

FIG. 5 is a schematic structural diagram of the conductive tube in FIG. 3 .

In the figure: 1. Conductive pipe; 11. Bevel of conductive pipe; 2. Joint; 21. Bevel of joint; 22. Silver-plated surface; 3. Welding position.

Detailed ways

Embodiments of the aluminum alloy busbar conductor of the present invention:

导电管的插接孔段的直径D2的尺寸为

以使导电管与接头过盈插接配合，导电管的外周面与接头主体的外周面对齐，导电管的朝向接头的端面与接头的朝向导电管的台阶面相贴，接头与导电管的对接处形成焊接位置3，在焊接位置3处进行激光焊接以形成焊缝。通过对铝合金母线导体采用激光焊接工艺进行焊接，提高了焊接效率，降低制造成本，同时降低焊接过程的污染。采用过盈配合，有利于增加接头与导电管的接触面积，增加通流面积及能力。As shown in Figure 3, Figure 4, and Figure 5, the aluminum alloy busbar conductor includes a conductive tube 1 and a joint 2, and the opposite end of the joint 2 and the conductive tube 1 is provided with a matching spigot structure, so that the joint 2 faces the conductive tube 1 One end of the conductive pipe 1 forms a stepped shaft structure, and the stepped shaft structure has a socket with a smaller outer diameter. The end of the central hole of the conductive tube 1 close to the joint 2 forms a stepped hole structure, and the stepped hole structure has a larger inner diameter. , the insertion part of the joint 2 is adapted to the insertion hole section of the conductive tube 1, wherein the diameter D1 of the insertion part of the joint 2 is

The size of the diameter D2 of the insertion hole section of the conductive pipe is

In order to make the conductive tube and the joint interference plug fit, the outer peripheral surface of the conductive tube is aligned with the outer peripheral surface of the joint body, the end surface of the conductive tube facing the joint is in contact with the stepped surface of the joint facing the conductive tube, and the butt joint between the joint and the conductive tube Welding position 3 is formed at welding position 3, and laser welding is performed at welding position 3 to form a weld seam. By adopting the laser welding process to weld the aluminum alloy busbar conductor, the welding efficiency is improved, the manufacturing cost is reduced, and the pollution in the welding process is reduced at the same time. The use of interference fit is conducive to increasing the contact area between the joint and the conductive tube, increasing the flow area and capacity.

In the above embodiments, the insertion part of the connector is in interference fit with the insertion hole section of the conductive tube. In other embodiments, the insertion portion of the connector can be clearance fit with the insertion hole section of the conductive pipe.

Embodiments of the aluminum alloy busbar conductor manufacturing method of the present invention:

A method for manufacturing an aluminum alloy busbar conductor, comprising the following steps:

导电管的插接孔段的直径D2的尺寸为

以保证过盈量。(1) Machining joints and conductive pipes: Machining matching spigot structures at the opposite ends of the joints and conductive pipes, so that one end of the joint facing the conductive pipes forms a stepped shaft structure, and the stepped shaft structure has a smaller outer diameter. The socket part, one end of the central hole of the conductive pipe forms a stepped hole structure, the stepped hole structure has a large inner diameter socket hole section, the socket part of the joint is adapted to the socket hole section of the conductive pipe, and the socket connection of the joint The diameter D1 of the section is dimensioned as

The size of the diameter D2 of the insertion hole section of the conductive pipe is

To ensure the amount of interference.

(2) Silver plating treatment: silver plating layer is applied on the set length of the end of the connector away from the insertion part.

(3) Pre-welding treatment: Before welding, clean up the single-piece weld bead. Use a wire brush to remove the oxide film on the surface of the joint and conductive tube, and then clean the weld bead with ethanol to avoid adverse effects on the welding quality.

(4) Pre-welding assembly and riveting fixation: The joint and the conductive pipe are butted and leveled, the socket part of the joint and the insertion hole section of the conductive pipe are interference fit, and there is no pre-set between the end surface of the conductive pipe and the step surface of the joint end. Leave a gap, the outer circle of the joint is flush with the outer circle of the conductive tube, and the joint of the joint and the conductive tube forms a welding position. Fix the conductive tubing and fittings with clamps and place them on the swivel stand. Rivet the butt joint between the joint and the conductive tube. Since the number and size of the riveting points have a great influence on the laser welding quality, the laser + welding wire is used for riveting, and the riveting points in the circumferential direction of the butt joint surface are not more than 3 places.

(5) Laser welding; during welding, the rotating frame drives the welded parts to rotate at a constant speed, and the laser welding head is fixed after adjusting the angle; in order to ensure the welding quality, the welding start and end should not be at the same position; in order to adapt to the welding gap, use together Welding tracking system; in order to reduce porosity, oscillating laser welding is adopted, laser power 6kW, spot diameter 4mm, oscillating amplitude 0.5-1mm, oscillating frequency 250-300Hz, defocus amount -3-0mm, welding speed 2-2.4m/min. The penetration depth after welding by the above steps can meet the requirements.

(6) Overall sanding: Sanding the bus conductor as a whole to ensure the surface finish.

Using the above method to realize the manufacture of the busbar conductor can improve the conductor manufacturing efficiency and reduce the manufacturing cost. The silver-plated joint and the conductive tube adopt an interference structure, which replaces the original small gap fit, increases the contact area between the silver-plated joint and the conductive tube, and increases the flow area and capacity. At the same time, the groove on the silver-plated joint and the conductive pipe is canceled, and 6kW laser welding is used instead of TIG welding. Laser welding can increase the welding speed to about 5 times that of conventional TIG arc welding, greatly improving welding efficiency, and the laser welding energy is concentrated, heat The influence area is small, which reduces the welding deformation of the joint and the influence on the silver-plated area, which can effectively reduce the length of the silver-plated joint and reduce the manufacturing cost. At the same time reduce the pollution of the welding process. On the premise of ensuring the flow capacity, the processing flow of the conductor is shortened, the welding efficiency is improved, the consumption of raw materials and welding pollution are reduced, and a rapid replacement of conventional arc welding can be realized.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it is still possible for those skilled in the art The technical solutions described in the foregoing embodiments are modified without creative effort, or equivalent replacements are made to some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. The manufacturing method of the aluminum alloy bus conductor is characterized by comprising the following steps of: butting and leveling a joint of the aluminum alloy bus conductor and the conductive pipe; riveting the butt joint part of the joint and the contact tube by adopting a mode of laser welding and adding welding wires, wherein the riveting point is not more than 3 positions in the circumferential direction of the butt joint surface; and welding the joint and the conductive tube by adopting a laser welding process, wherein during laser welding, the laser power is not less than 6kW, the spot diameter is 3-5 mm, the defocusing amount is-3-0 mm, and the welding speed is 2-2.4 m/min.

2. The method for manufacturing an aluminum alloy bus bar conductor according to claim 1, wherein the laser welding is performed by swing laser welding with a swing amplitude of 0.5 to 1mm and a swing frequency of 250 to 300Hz.

3. The method of manufacturing an aluminum alloy bus bar conductor according to claim 1 or 2, wherein the joint and the conductive pipe are fitted with interference when the joint and the conductive pipe are butted.

4. The method of manufacturing an aluminum alloy bus bar conductor according to claim 3, wherein the interference is 0.1 to 0.3mm.

5. The aluminum alloy bus conductor manufacturing method according to claim 1 or 2, wherein before riveting, the joint and the to-be-welded portion of the contact tube are fixed by a jig and placed on a rotating frame, and the rotating frame drives the to-be-welded member to rotate at a constant speed.

6. The method of manufacturing an aluminum alloy bus bar conductor according to claim 1 or 2, wherein welding start and end ends are displaced.

7. The aluminum alloy bus bar conductor manufacturing method according to claim 1 or 2, wherein a welding tracking system is used in cooperation with the laser welding.

8. The aluminum alloy bus conductor comprises a conductive tube and a joint, wherein the conductive tube is welded with the joint.

9. The aluminum alloy bus bar conductor according to claim 8, wherein the conductive tube is an interference fit with the joint.

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