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Welding method for aluminum and copper

A welding method and pre-welding technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve problems such as weld cracks, oxides that are difficult to remove, and aluminum, copper, and filler materials that cannot be well fused , to achieve the effect of good plasticity and good welding quality

Inactive Publication Date: 2016-06-15
CHONGQING SHANGKE MACHINERY MFG CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

The oxides formed are difficult to remove. These oxides prevent the fusion of aluminum, copper and filling materials well, and at the same time form low-melting point eutectic or brittle compounds at the grain boundaries, often causing weld cracks

Method used

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Embodiment Construction

[0013] Below in conjunction with embodiment the present invention will be further described, and its operating steps are as follows:

[0014] A welding method for aluminum and copper, the welding method comprises the following steps:

[0015] a. Using cold pressure welding method;

[0016] b. Anneal the aluminum and copper base metal before welding; the annealing temperature is 450-600°C;

[0017] c. Thoroughly clean the metal oxide films and oil stains of the two base metals after annealing, and precisely process the joint surface of the joint, with a surface roughness of Ra0.8-1.6um, and make the axis perpendicular to the surface;

[0018] d. Use LHJ-15 cold press welding machine and hand welding tongs;

[0019] e. Lap joints are used for aluminum and copper conductors; when aluminum and copper are lapped, the pressure is 800-1200MPa; when butt-connected, the pressure is 2400-3000MPa;

[0020] f. After cold pressure welding, the welded joints should be cleaned and welded ...

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PUM

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Abstract

The invention discloses a welding method for aluminum and copper. The welding method is characterized by comprising the following steps that a, a cold pressure welding method is adopted; b, an aluminum base material and a copper base material are subjected to annealing treatment before welding, and the annealing temperature is 450-600 DEG C; c, metal oxide films and greasy dirt on the two annealed base materials are cleaned up, the joint surfaces of joints are accurately machined, the surface roughness Ra is 0.8-1.6 micrometers, and the axes are accurately perpendicular to the surfaces; d, an LHJ-15-model cold pressure welder and manual welding tongs are adopted; e, a wire of the aluminum and a wire of the copper adopt overlap joints, the pressure is 800-1200 MPa during overlap joint of the aluminum and the copper, and the pressure is 2400-3000 Mpa during butt joint; and f, after cold pressure welding, welding joints are cleaned, and welding quality inspection is conducted. According to the welding method for the aluminum and the copper, the plasticity is good, and the aluminum joint and the copper joint have high welding quality.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a welding method for aluminum and copper. Background technique [0002] The melting points of aluminum and copper differ greatly, up to 423°C. It is difficult to melt at the same time during welding. The brittle intermetallic compound formed by aluminum and copper affects the strength and plasticity of the joint. In order to prevent the formation of intermetallic compounds, the contact time between liquid aluminum and liquid copper should be shortened as much as possible. When the copper content in the aluminum-copper alloy is below 13%, the overall performance is the best, so try to control the copper content in the aluminum-copper alloy of the weld metal to not exceed the above range during welding, or use an aluminum-based alloy; Since both aluminum and copper have a high affinity for oxygen, they are strongly oxidized at high temperatures. When the molten pool crystallizes,...

Claims

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Application Information

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IPC IPC(8): B23K20/02B23K20/233
Inventor 黄安民
Owner CHONGQING SHANGKE MACHINERY MFG CO LTD
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