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Aluminum alloy spot welding dynamic preheating welding method

A welding method and aluminum alloy technology, which is applied in the field of aluminum alloy welding, can solve problems such as excessive welding, damage to electrode heads, and unstable quality of continuous solder joints in aluminum alloy resistance spot welding.

Inactive Publication Date: 2021-09-14
天津七所高科技有限公司
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Problems solved by technology

[0005] In view of this, the present invention aims to propose a dynamic preheating welding method for aluminum alloy spot welding to solve the problem of insufficient or too much heat input in the preheating stage when the welding preheating time is fixed, and the electrode tip is damaged, resulting in aluminum alloy spot welding. Unstable Quality of Continuous Welding Joints in Resistance Spot Welding

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Embodiment Construction

[0029] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...

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Abstract

The invention provides an aluminum alloy spot welding dynamic preheating welding method. A dynamic preheating process method is adopted, the preheating time is not a fixed value any more and is dynamically changed, that is, when a real-time resistance value between two electrodes reaches a set value, the preheating process is completed, welding heat input in the preheating process is accurate and controllable, when an oxide layer on the surface of an aluminum alloy is punctured, the preheating process is finished, and the main welding process is started, so that the interface resistance of the electrodes and the aluminum alloy can be effectively reduced, the heat conduction capability of the electrodes and the aluminum alloy can be improved, the interface heat can be reduced, the process firmness is remarkably improved, the external splashing phenomenon is eliminated, the welding spot nugget quality of an aluminum alloy plate is improved, and the stability of welding quality is realized.

Description

technical field [0001] The invention belongs to the field of aluminum alloy welding, and in particular relates to a dynamic preheating welding method for aluminum alloy spot welding. Background technique [0002] In the process of automobile lightweighting, aluminum alloys have broad application prospects in the automobile industry due to their high specific strength, corrosion resistance, and low cost of recyclability. [0003] The chemical activity of aluminum alloy is very strong, and it is easy to form a dense oxide film on the surface. The high-resistance oxide film is randomly distributed on the surface of the plate. A qualified nugget, which will cause the local current density on the surface of the workpiece to be too high, and melt instantaneously, resulting in early splashing and affecting the quality of solder joints. [0004] In order to destroy the oxide film on the surface of the aluminum alloy plate, the conventional spot welding process is to increase the pr...

Claims

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Application Information

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IPC IPC(8): B23K11/11B23K11/24B23K11/36
CPCB23K11/115B23K11/24B23K11/36Y02P70/10
Inventor 史涛郭春飞田增泰陈洪杰王帆
Owner 天津七所高科技有限公司
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