Microalloying improves the quality of mg-fe spot welding of dissimilar metals

A technology of heterogeneous metals and microalloying, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve problems such as inability to obtain effects

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 heterogeneous metals, the use of three metal powders of Fe, Al, and 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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  • Microalloying improves the quality of mg-fe spot welding of dissimilar metals
  • Microalloying improves the quality of mg-fe spot welding of dissimilar metals

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Embodiment Construction

[0018] A microalloying process for improving the quality of heterogeneous metal Mg-Fe spot welding is carried out in the following steps:

[0019] Step 1. Prepare the alloy paste

[0020] Weigh the Mn powder and the Al powder according to the mass ratio of 1-5:5-9, mix the Mn powder and the Al powder evenly in proportion, add a volatile solvent to prepare the alloy paste; the volatile solvent is acetone ;

[0021] Step 2. Pretreatment of materials to be welded

[0022] Stir the alloy slurry, and when the viscosity is 0.65-0.7Pa·s, scrape the alloy slurry on the lap joint between the Mg material and the Fe material to be welded, and form an alloy between the joints of the Mg material and the Fe material. pulp layer;

[0023] In described step 2, the surface of the Mg material and the Fe material at the lap joint place is scraped and coated with alloy slurry group respectively, the thickness of the alloy slurry group layer on the surface of the Mg material is 2 times of the t...

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Abstract

The invention discloses a technology for improving the dissimilar metal Mg-Fe spot welding quality through microalloying. The technology comprises the steps that firstly, Mn powder, Al powder and a volatile solvent serve as raw materials to prepare an alloy pulp cluster; secondly, when the alloy pulp cluster has proper viscosity, the alloy pulp cluster is scraped to the lap joint connector position of a to-be-welded Mg material and a to-be-welded Fe material, and accordingly the to-be-welded materials are subjected to pretreatment; and thirdly, a lap joint connector of the Mg material and the Fe material is subjected to spot welding. Adoption of the technology for improving the dissimilar metal Mg-Fe spot welding quality through microalloying has the obvious beneficial effects that the size of molten cores between the dissimilar metal Mg and Fe after spot welding is increased, distribution of the molten cores between Mg and Fe is uniform and symmetric, the anti-shearing performance between the dissimilar metal Mg and Fe after spot welding is obviously improved, and the spot welding quality between the dissimilar metal Mg and Fe is improved.

Description

technical field [0001] The invention relates to a spot welding method, in particular to a process for improving the quality of spot welding between Mg-Fe. 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, researchers found that for spot welding between homogeneous metal Mg, by using three metal powders of Fe-Al-Zn, a microalloyed zone can be formed at the welded joint of metal Mg, thereby harvesting the nugget Regular symmetry, excellent effect of enlarged nugget size; the shear resistance and corrosion resistance of welded joints are also significantly increased, and the quality of spot welding is improved. [0003] At the same time, the researchers also found that when spot welding between heterogeneous metals, the use of three metal powders of Fe, Al, and Zn, or any one of them, or any two of them, cannot obtain the same quality as that of homogeneo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/11B23K11/34B23K11/20
CPCB23K11/11B23K11/20B23K11/34
Inventor 王刚姚宗湘尹立孟张丽萍唐丽
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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