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The method of improving the quality of al-cu spot welding

An al-cu and spot welding technology, applied in the direction of welding medium, welding/cutting medium/material, welding equipment, etc., can solve problems such as inability to obtain results

Active Publication Date: 2019-07-02
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0003] At the same time, the researchers also found that when spot welding between dissimilar metals, using three metal powders of Cu, Al, Zn, or any one of them, or any two of them, cannot obtain the same quality as that of homogeneous metals. Same effect as Mg

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Embodiment Construction

[0016] One, the present invention will be further described below in conjunction with embodiment.

[0017] A method for improving Al-Cu spot welding quality, characterized in that it proceeds in the following steps:

[0018] Step 1, weighing Mn powder and Zn powder according to the mass ratio of 6~10:1~3;

[0019] Step 2, mixing the Mn powder and the Zn powder evenly in proportion, adding a volatile solvent to prepare an alloy powder, and the volatile solvent is acetone;

[0020] Step 3. Stir the alloy powder. When the viscosity is 0.5 to 0.55 Pa·s, scrape the alloy powder on the lap joint between the Al material and the Cu material to be welded. Alloy powder group layer is formed between the joints, the thickness of the alloy powder group layer on the surface of the Al material is 2 times the thickness of the alloy powder group layer on the surface of the Cu material, and the thickness of the alloy powder group layer on the surface of the Al material is the same as that of t...

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Abstract

The invention discloses a method of improving Al-Cu spot welding quality. The method comprises the following steps: one, Mn powder and Zn powder are weighed according to a mass ratio of (6-10):(1-3); two, the Mn powder and the Zn powder are proportionally mixed uniformly, a volatile solvent is added, and an alloy powder paste is formed through blending; three, the alloy powder paste is stirred, after the viscosity of the alloy powder paste is 0.5-0.55Pa.s, overlap joints of a Al material and a Cu material which are to be welded are subjected to knife coating with the alloy powder paste, and alloy powder paste layers are formed at the Al material and the Cu material; and four, the overlap joints of the Al material and the Cu material are subjected to spot welding. The method has the significant effects that the cast nugget size of dissimilar metal Al-Cu is increased, cast nuggets are distributed uniformly and symmetrically between Al and Cu, the shearing resistance of the dissimilar metal Al-Cu is improved significantly, and thus the spot welding quality of the dissimilar metal Al-Cu is improved.

Description

technical field [0001] The invention relates to a spot welding method, in particular to a pretreatment method for spot welding between Al-Cu, and improves the quality of Al-Cu spot welding. Background technique [0002] For some brittle metals, it is difficult to form a solid solution during spot welding, so the welding quality is not good. In an earlier study ("Study on the Effect of Microalloying on the Microstructure and Corrosion Resistance of AZ31B Magnesium Alloy Spot Welding Joints"" published in "Thermal Processing Technology" [April 2017, Volume 46, Issue 7]) It was found that for the spot welding between homogeneous metal Mg, by using three metal powders of Cu-Al-Zn, a microalloyed area can be formed at the welded joint of metal Mg, so that the nugget is regular and symmetrical, and the size of the nugget becomes smaller. Great excellent effect; the shear resistance and corrosion resistance of welded joints are also significantly increased, and the quality of spot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/11B23K11/20B23K35/30B23K35/36B23K103/18
CPCB23K11/11B23K11/20B23K35/3026B23K35/3612B23K2103/18
Inventor 王刚姚宗湘尹立孟张丽萍刘成
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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