Friction stir welding method for different metal plates

Abstract

The invention provides a friction stir welding method for different metal plates. The friction stir welding method for different metal plates comprises the following steps that (1) the relative thicknesses of two metal plates are determined; (2) connector structures are machined at the welding end of the two metal plates, specifically, a rectangular groove is machined in the welding end of the low-melting point metal plate, and a rectangular boss is machined at the welding end of the high-melting point metal plate, and the height and thickness of the rectangular boss are matched with the depth and width of the rectangular groove correspondingly; (3) whether a transition layer capable of avoiding or reducing generated intermetallic compounds needs to be additionally arranged or nor is determined, specifically, the transition layer is arranged on the surface of the rectangular boss if the ductility of the intermetalic compounds between the two metal plates is not larger than 2%, otherwise, the next step is executed directly; (4) the two metal plates are fixed through clamps; (5) welding technological parameters are set; and (6) welding of the two metal plates is completed through a stirring head according to the set welding technological parameters. According to the friction stir welding method for different metal plates, the welding quality is high, and the stress condition of connectors can be improved.

Description

technical field [0001] The invention relates to the technical field of connection of dissimilar metal plates, in particular to a friction stir welding method between dissimilar metal plates. Background technique [0002] In industrial production, since different metals have different advantages, dissimilar metal connectors obtained by connecting different metals usually have greater practical value. For example, the most widely used non-ferrous metal aluminum and aluminum alloys in today's industry have light weight, high specific strength, corrosion resistance, and good thermal and electrical conductivity; steel, the most commonly used structural material in engineering, has relatively high strength; There is also a titanium and titanium alloy that have been widely used in the field of marine ships, which not only have high specific strength, but also have good corrosion resistance. Therefore, the dissimilar metal connectors obtained by connecting any two of the above three...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, when the friction stir welding method is used to weld two different metal plates, a straight plate type butt joint structure or a single-side lap joint structure is adopted. The former is not only prone to side separation of the two metal plates, but also due to the The generation of compounds reduces the bonding strength, which cannot meet the strength requirements of actual use; the latter reduces the connection strength due to the lack of bonding surfaces, and the latter’s single-side lap structure also limits the force of the obtained dissimilar metal connectors. , in short, the existing welding methods cannot meet the needs of welding quality requirements between dissimilar metal materials, especially dissimilar metal plates

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