Laser welding method of noble metal spark plug electrode

Abstract

The invention relates to a laser welding method of a noble metal spark plug electrode. The end face of a base material of the electrode is a plane, the melting point of the base material is lower thanthat of a noble metal material, the noble metal material is directly put on the plane of the end face of the electrode of the base material, noble metal is fixed on the plane of the end face of the electrode by common resistance welding, the material is locally heated in a tiny area by laser pulse from the top of the material, and the noble metal and the plane of the end face of the base materialare respectively molten according to different time sequences. The method comprises the following steps: firstly, the central part of the plane of the end face of the electrode which is used for holding the noble metal is molten step by step, and a molten pool which is sunken inwards formed at the central part of the plane of the end face; the noble metal falls into the formed molten pool; then,the molten pool is continuously heated, and the noble metal is molten in the formed molten pool and is molten and welded together with the base material which is already molten; and after the noble metal which is molten and welded together is cooled, the noble metal is shaped and processed by common machine processing, the surface is flattened and compacted, and a spark plug electrode compoundingthe noble metal and a common material is formed.

Description

technical field [0001] The patent of the present invention relates to a manufacturing method of a spark plug electrode, in particular to a method of manufacturing a precious metal spark plug electrode by laser welding. It is mainly used in the production process of various precious metal spark plug center electrodes. Background technique [0002] With the rapid development of the automobile industry and the continuous improvement of people's awareness of the environment, customers' requirements for the spark plug, which is the core part of gasoline engine ignition, are also increasing, mainly in terms of ignition reliability, product life and high ignition voltage requirements. For this reason, in the past ten years, our company has introduced the platinum spark plug and the iridium precious metal spark plug for the first time in China by referring to the advanced technology of the same industry abroad. But the welding of precious metal spark plugs, as a key technology of t...

AI Technical Summary

Problems solved by technology

A part of the precious metal is inserted into a hole in the center electrode, and welding is carried out by emitting laser light to the side of the center electrode where the noble metal hole is inserted, so that the boundary area around the hole where the center electrode is inserted with the noble metal is partially or completely melted for welding. Practice has proved that this kind of side laser welding The quality of the method is still not very good

Especially after the precious metal is fused with the surrounding metal, it is very easy to have uneven density of the precious metal, which will affect the overall quality of the welding

Moreover, with this laser welding method, it is necessary to process the center electrode first, and then put the precious metal into the hole. The process is relatively complicated, and it is very difficult to ensure the processing accuracy. Therefore, it is necessary to further improve this.

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