Tungsten Bimetal Contact Point For Automotive Horn Bimetal structure

First of all, tungsten, the core material of the contact point, is selected as the main electrical contact material. Tungsten has excellent electrical conductivity and high temperature resistance. It can provide low contact resistance when high current passes through, ensuring efficient current transmission when the horn is started. Tungsten has an extremely high melting point of 3422°C, which is far higher than conventional metals. This allows tungsten contact points to maintain stable electrical properties at extremely high temperatures and will not melt or degrade due to excessive temperature. Therefore, tungsten contact points are particularly suitable for high-power and high-load applications, such as car horn systems, and can continue to work in high-temperature environments without failure.

The strength and hardness of tungsten materials also provide guarantees for the wear resistance of contact points. When car horns are frequently started and stopped and work under high load, the surface of the contact points is often severely worn, and the high hardness of tungsten makes it almost not easy to wear out during repeated contact, thereby avoiding poor contact caused by wear on the surface of the contact points. The wear resistance of tungsten ensures that the contact points can maintain stable current conduction capabilities even in long-term and high-frequency use, reducing maintenance costs and replacement frequency.

Secondly, the tungsten contact point adopts a bimetallic structure, and the combination with the copper or iron substrate further enhances the mechanical stability and welding strength of the contact point. In the bimetallic structure, the tungsten sheet and the copper rivet or iron (stainless steel) rivet are tightly connected by advanced vacuum high-frequency brazing technology. The main function of the copper or iron substrate is to provide structural support and mechanical strength for the contact point, so that the contact point can withstand high-load current and remain stable under long-term high-frequency operation in the car horn system. The different characteristics of tungsten and copper or iron complement each other. Tungsten provides excellent electrical performance and wear resistance, while copper or iron enhances the stability and vibration resistance of the contact point, ensuring that the contact point can work stably and long-term in the complex automotive environment.

In terms of welding process, Tungsten Bimetal Contact Point For Automotive Horn adopts vacuum high-frequency brazing furnace technology. This process can perform high-frequency heating in a vacuum environment, so as to accurately combine the tungsten sheet, copper rivet or iron rivet and brazing material, ensuring the high strength and high reliability of the welding point. Compared with traditional welding methods, vacuum brazing can effectively avoid oxidation, pores and cracks, and improve the quality of welding and the stability of the welding point. In a vacuum environment, high-frequency brazing can achieve precise temperature control in a short time, avoiding overheating or temperature fluctuations that have adverse effects on the welding effect. The firmness of the welding point not only enhances the stability of the contact point under electrical load, but also improves the vibration and impact resistance of the overall component, thereby effectively reducing the poor contact problems that may be caused by vibration, collision and other reasons during the operation of the car.

In order to further improve the corrosion resistance and oxidation resistance of the contact point, the surface treatment of Tungsten Bimetal Contact Point adopts nickel plating technology. Nickel plating on the surface of tungsten contact points can effectively prevent corrosion of the contact points in humid and oxidizing environments and extend their service life. The nickel layer provides a protective barrier to prevent the contact points from being oxidized or corroded due to moisture, oxygen and other factors in the air during long-term use, thereby ensuring stable electrical contact performance. For pure tungsten contact points that do not require nickel plating, their surface can also maintain good natural oxidation resistance, especially when used in dry or non-corrosive environments, and can continue to provide efficient electrical contact performance.

The design of this bimetallic structure takes advantage of the complementary advantages of tungsten materials and copper or iron. While ensuring electrical performance, it also takes into account the long-term stability of the contact points under high loads, high-frequency switching and harsh environments. Specifically, tungsten's high conductivity and high temperature resistance ensure that the contact points can still respond quickly and maintain low contact resistance under high current and high temperature conditions, while the copper or iron substrate provides mechanical strength and enhances the stability of the contact points under physical pressure, vibration and impact. In addition, the vacuum high-frequency brazing process ensures the efficient combination between the tungsten sheet and the rivet, so that the contact points do not have any pores or cracks during the current conduction process, avoiding the risk of poor contact. The surface nickel plating further improves the corrosion resistance, ensuring that the contact points can maintain excellent electrical contact performance in various environments.