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Aluminum-copper alloy grounding material welding wire and preparation method thereof

A technology of aluminum-copper alloy and welding method, applied in welding equipment, welding/cutting medium/material, welding medium, etc., can solve the problem of large difference between joint composition and structure and base metal, threat to safe operation of power system, and poor corrosion resistance in joint area and other problems, to achieve the effects of excellent soil corrosion resistance, simple and easy preparation method and low cost

Active Publication Date: 2017-06-20
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the welding of aluminum-copper alloy grounding materials, conventional Al-Si series welding wire and Al-Cu series welding wire are used. Among them, Al-Si series welding wire refers to ER4047 and ER4043, and Al-Cu series welding wire refers to ER2319 and ER4145. These welding wires are used to weld aluminum-copper alloy grounding materials. Although the mechanical properties of the joints can meet the requirements, due to the mismatch between the composition of the welding wire and the base metal, the composition and structure of the joint are quite different from the base metal, resulting in the resistance of the joint area. Poor corrosion
In a complex soil environment, poor corrosion resistance of welded joints will lead to interruption of the grounding grid, which will pose a great threat and potential safety hazard to the safe operation of the power system. Therefore, the welded joints of the grounding grid are required to have good soil corrosion resistance.
[0004] To sum up, in the prior art, there is still no effective solution to the problem of poor soil corrosion resistance after the welding wire used for welding aluminum-copper alloy grounding materials forms a welded joint.

Method used

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  • Aluminum-copper alloy grounding material welding wire and preparation method thereof

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preparation example Construction

[0053] A second aspect of the present invention provides a method for preparing a welding wire for welding aluminum-copper alloy grounding materials, comprising the following steps:

[0054] Heat and melt the aluminum ingot, add the master alloy of other raw materials in proportion, when the raw material is fully melted in the molten pool, carry out slag removal and stirring, then take samples to test and adjust the composition, refining, and then cast into a rod-shaped aluminum alloy ingot;

[0055] The rod-shaped aluminum alloy ingot is extruded by the hot extrusion process, and processed into an aluminum alloy wire billet;

[0056] The aluminum alloy wire billet is drawn into a certain specification of aluminum-copper alloy grounding material welding wire by adopting a drawing process.

[0057] In the present invention, the pouring temperature is 680-730°C.

[0058] In the present invention, the heating temperature in the hot extrusion process is 440-460°C. Adopting this ...

Embodiment 1

[0070] A welding wire for welding aluminum-copper alloy grounding materials, the mass percentage of each component is: silicon 1%, copper 3%, iron 0.1%, zirconium 0.003%, rare earth 0.05%, and the balance is aluminum. Wherein, the rare earth is lanthanum.

[0071] The preparation method of the welding wire for welding the aluminum-copper alloy grounding material comprises the following steps:

[0072] Firstly, aluminum-copper rare-earth alloy ingots are smelted. Put the aluminum ingot into the furnace to heat. After the aluminum ingot is melted, add the master alloy of other raw materials according to the above ratio. When the furnace material is fully melted in the molten pool, carry out slag removal and stirring, then take samples to test and adjust the composition, refining, and pouring out of the furnace A rod-shaped aluminum-copper rare-earth alloy ingot with a diameter of 110mm is formed, and the pouring temperature is 690°C. Then, the rod-shaped aluminum-copper rare-e...

Embodiment 2

[0075] A welding wire for welding aluminum-copper alloy grounding materials, the mass percent of each component is: silicon 1.5%, copper 2.5%, iron 0.3%, zirconium 0.002%, rare earth 0.08%, and the balance is aluminum. Wherein, the rare earth is cerium.

[0076] The preparation method of the welding wire for welding the aluminum-copper alloy grounding material comprises the following steps:

[0077] Firstly, aluminum-copper rare-earth alloy ingots are smelted. Put the aluminum ingot into the furnace to heat. After the aluminum ingot is melted, add the master alloy of other raw materials according to the above ratio. When the furnace material is fully melted in the molten pool, carry out slag removal and stirring, then take samples to test and adjust the composition, refining, and pouring out of the furnace A rod-shaped aluminum alloy ingot with a diameter of 110mm is formed, and the pouring temperature is 690°C. Then the aluminum-copper rare-earth alloy ingot is hot-extruded i...

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Abstract

The invention discloses an aluminum-copper alloy grounding material welding wire and a preparation method thereof. The aluminum-copper alloy grounding material welding wire comprises, by mass, 1%-3% of silicon, 1%-3% of copper, 0-0.3% of iron, 0.001%-0.05% of zirconium, 0.001%-0.5% of rare earth, and the balance aluminum. The aluminum-copper alloy grounding material welding wire can achieve welding of an aluminum-copper alloy grounding material, the structure of a weld zone is fine, the components are similar to those of parent metal, the potential difference is small, and the soil corrosion resistance is good.

Description

technical field [0001] The invention relates to a welding material, in particular to an aluminum alloy welding wire used for welding aluminum-copper alloy grounding materials and a preparation method thereof. Background technique [0002] The substation grounding grid is a key component to maintain the safe and reliable operation of the power system and ensure the safety of personnel and equipment. The aluminum-copper alloy material for the grounding grid is currently an ideal material for the grounding grid. It has the following advantages: it can withstand strong grounding current; it has good corrosion resistance to the soil environment where the substation is located, and meets the requirements for the service life of the grounding grid. request etc. According to 3.41 of GB50169-2006 "Code for Construction and Acceptance of Grounding Devices in Electrical Installation Engineering", the connection of the grounding body (wire) should be welded, and the welding must be fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/286B23K35/40
Inventor 闫风洁李辛庚岳增武王晓明樊志彬郭凯傅敏孙伟翟季青刘延华
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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