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Intermediate frequency spot welding method for aluminum alloy and zinc-plated high-strength steel dissimilar material

A technology of dissimilar materials and aluminum alloys, applied in welding equipment, resistance welding equipment, metal processing equipment, etc., can solve the problem of high cost, achieve the effects of low cost, control growth behavior, prevent adhesion and alloying reaction

Inactive Publication Date: 2016-01-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the friction stir welding of aluminum and steel is still in the research and exploration, and the cost is high, and it has not been applied in the field of automobile manufacturing.

Method used

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  • Intermediate frequency spot welding method for aluminum alloy and zinc-plated high-strength steel dissimilar material
  • Intermediate frequency spot welding method for aluminum alloy and zinc-plated high-strength steel dissimilar material
  • Intermediate frequency spot welding method for aluminum alloy and zinc-plated high-strength steel dissimilar material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The chemical composition of the galvanized high-strength steel plate to be welded is (wt.%): C0.01%, Si0.09%, Mn0.51%, S0.01%, P0.05%, Nb0.02%, Ti0.01% , Fe balance; the galvanizing process adopts double-sided hot-dip galvanizing, and the thickness of the galvanized layer is 8 μm; the main phase structure is α-Fe, the yield strength is 260MPa, the tensile strength is 410MPa, and the elongation is 32%; galvanized high-strength The steel plate is processed into 100mm×25mm×1mm by wire cutting. The chemical composition of the aluminum alloy plate to be welded is (wt.%): Mg0.45%, Si0.56%, Cu0.15%, Mn0.45%, Zn0.01%, Fe0.19%, V0.08%, Ti0.02%, Al balance; the initial supply state is T6 state; the main phase structure is α-Al, the yield strength is 270MPa, the tensile strength is 310MPa, and the elongation is 15%; the aluminum alloy plate is processed by wire cutting 100mm×25mm×1.5mm. The intermediate frequency spot welding method of the present invention is used for welding, ...

Embodiment 2

[0052] The material and workpiece size of the galvanized high-strength steel plate and the aluminum alloy plate to be welded are the same as those in Example 1. The intermediate frequency spot welding method of the present invention is used for welding, wherein the spot welding electrode material is CuCr alloy, the aluminum alloy side electrode is a spherical electrode with a diameter of 70 mm, and the galvanized high-strength steel side electrode is a flat end electrode with a diameter of 12 mm. The roughness Ra values ​​are all 0.8 μm. The medium frequency spot welding process parameters are selected as follows: the spot welding current is 24kA, the welding time is 0.35s, the electrode pressure is 3.5kN, the preloading time is 0.4s, and the holding time is 0.4s.

[0053] The test results show that the surface of the intermediate frequency spot welding joint of aluminum alloy / galvanized high-strength steel dissimilar materials is well formed (such as Figure 8 As shown), the...

Embodiment 3

[0055] The material and workpiece size of the galvanized high-strength steel plate and the aluminum alloy plate to be welded are the same as those in Example 1. The intermediate frequency spot welding method of the present invention is used for welding, wherein the spot welding electrode material is CuCr alloy, the aluminum alloy side electrode is a spherical electrode with a diameter of 100 mm, and the galvanized high-strength steel side electrode is a flat end electrode with a diameter of 10 mm. The roughness Ra values ​​are all 0.8 μm. The medium frequency spot welding process parameters are selected as follows: the spot welding current is 25kA, the welding time is 0.4s, the electrode pressure is 4kN, the preloading time is 0.4s, and the holding time is 0.4s.

[0056] The test results show that the surface of the intermediate frequency spot welding joint of aluminum alloy / galvanized high-strength steel dissimilar materials is well formed (such as Figure 11 As shown), the ...

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Abstract

The invention discloses an intermediate frequency spot welding method for an aluminum alloy and zinc-plated high-strength steel dissimilar material and belongs to the technical field of metal material welding. According to the intermediate frequency spot welding method, spot-welding electrodes are adopted for welding aluminum alloy and zinc-plated high-strength steel. The side of the aluminum alloy is provided with the radius tip electrode with the diameter of 30-100 mm, and the side of the zinc-plated high-strength steel is the flat electrode with the diameter of 8-15 mm. According to the intermediate frequency spot welding method, generation of splashing can be reduced in the spot welding process, and adhesion of a workpiece and the electrodes and an alloying reaction are prevented. Meanwhile, the size of a spot-welding nugget on the side of the aluminum alloy is increased, the growth behavior of an intermetallic compound on the interface of the aluminum alloy / zinc-plated high-strength steel is controlled, and generation of fragile FexAly intermetallic compound is reduced. The performance of an aluminum alloy and zinc-plated high-strength steel dissimilar material intermediate frequency spot-welded connector obtained through optimization of the technological parameters of resistance spot welding is significantly improved, and the tensile shearing force of the spot-welded connector can be as high as 5400 N. The thickness of the intermetallic compound on the interface of the aluminum alloy / zinc-plated high-strength steel is controlled to be below 5.0 [mu]m.

Description

technical field [0001] The invention relates to the technical field of metal material welding, in particular to a method for intermediate frequency spot welding of dissimilar materials such as aluminum alloy and galvanized high-strength steel. Background technique [0002] Under the urgent situation of resource shortage and environmental pollution, automobile lightweight is one of the countermeasures to achieve energy saving and emission reduction in the field of automobile industry. The ways to achieve lightweight vehicles mainly include the use of lightweight materials, the optimal design of vehicle structures, and the application of advanced manufacturing technologies. Increasing the proportion of lightweight materials such as aluminum alloy and high-strength steel in the car body is the most direct and effective way to achieve lightweight cars. The steel / aluminum composite body frame structure in which aluminum alloy components are added to the high-strength steel struc...

Claims

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Application Information

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IPC IPC(8): B23K11/11B23K11/34B23K11/20
Inventor 张伟华孙大千
Owner JILIN UNIV
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