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Resistance spot welding method of dissimilar alloys between 6061-t6 aluminum alloy and trip980 high-strength steel

A technology of alloy resistance and high-strength steel, which is applied in the direction of resistance welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of high interlayer cost, poor mechanical properties, and high brittleness of welding joints, etc. Improve and reduce the effect of welding stress

Active Publication Date: 2021-03-23
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still problems such as high cost of interlayer, high brittleness of dissimilar spot welded joints between aluminum alloy and high-strength steel, and poor mechanical properties.

Method used

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  • Resistance spot welding method of dissimilar alloys between 6061-t6 aluminum alloy and trip980 high-strength steel
  • Resistance spot welding method of dissimilar alloys between 6061-t6 aluminum alloy and trip980 high-strength steel
  • Resistance spot welding method of dissimilar alloys between 6061-t6 aluminum alloy and trip980 high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 Welding conditions are on the influence of aluminum / steel spot welded joint mechanical properties

[0047] The conical flat electrode tip with a diameter of 8mm was studied according to the single factor rule, and the effects of welding current, welding time and electrode pressure on the mechanical properties of the steel / aluminum spot welded joint were studied respectively. During the experiment, three samples were welded under each set of parameters to ensure the stability of the test results. According to the tensile force and welding quality, the optimal parameters under the condition of dissimilar resistance spot welding between 6061-T6 aluminum alloy and TRIP980 high-strength steel were determined.

[0048] 1.1 Influence of welding current

[0049] Under the stable conditions of welding time (30cyc) and electrode pressure (2kN), the influence of welding current (6.5-10.5kA) on the mechanical properties of steel / aluminum dissimilar joints was studie...

Embodiment 2

[0088] Example 2 Effect of Cu on the mechanical properties of aluminum / steel spot welded joints

[0089] In this example, the effects of welding current, welding time, and electrode pressure on the mechanical properties of aluminum / steel spot welded joints are studied respectively, and optimal parameters are determined according to factors such as the magnitude of the tensile force and the surface forming quality of the joint, and the spot welding Mechanism of head fracture.

[0090] 2.1.1 Influence of welding current on the mechanical properties of aluminum / steel spot welded joints

[0091] Since the addition of copper sheet increases the welding heat input, it is necessary to select larger welding parameters to achieve effective welding. Compared with no copper sheet, the welding current of 10-17kA is used sequentially, the electrode pressure is kept at 1.5kN, and the welding time is 20cycle. During the experiment, it was found that the tensile force of the spot welding ...

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Abstract

The invention discloses a 6061-T6 aluminum alloy and TRIP980 high-strength steel dissimilar alloy resistance point welding method. The welding conditions of resistance point welding are as follows: the welding current is 6.5 kA to 10.5 kA, the welding time is 15 cyc to 60 cyc and the electrode pressure is 1 kN to 3.5 kN. Due to addition of Cu, the plasticity and toughness of a joint can be effectively improved under the condition of increasing the drawing force of the joint, the breakage mode is button breakage and is ductile-brittle breakage, the welding head preheating step is increased, the cooling speed after welding is reduced and the welding stress is reduced; and due to increment of preheating current, the metal plasticity can be improved, a workpiece is easy to fit closely, splashing is avoided, crack is avoided and the mechanical property of the point welding joint is improved.

Description

technical field [0001] The invention relates to the technical field of metal welding machines. Specifically, it is the resistance spot welding method of 6061-T6 aluminum alloy and TRIP980 high-strength steel dissimilar alloy. Background technique [0002] In recent years, due to the increasingly serious problems of energy crisis and automobile exhaust emissions, automobile lightweight has attracted more and more attention. Among them, the connection between aluminum alloy and high-strength steel is an important research direction for the development of automobile lightweight. However, for both, thick and brittle Fe-Al intermetallic compounds are easily formed at the interface due to metallurgical immiscibility, which deteriorates the mechanical properties of the joint. In this regard, researchers have explored laser brazing, explosive welding, and friction stir welding, which are suitable for aluminum / steel dissimilar connection methods, but due to the cost and applicabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/11B23K11/18B23K11/34B23K103/20
CPCB23K11/11B23K11/185B23K11/34B23K2103/20
Inventor 陈芙蓉郑纲王金财
Owner INNER MONGOLIA UNIV OF TECH
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