Products Description
Tungsten Contacts for Electric Car Horns are critical electrical switching components designed specifically for the high-frequency sound systems of automobiles and motorcycles. They are engineered to withstand the arc erosion caused by frequent make-and-break operations under harsh conditions, thereby ensuring the reliable triggering of the horn signal. As essential elements of modern vehicle safety warning systems, these contacts typically feature a composite "head-and-shank" structure; a high-melting-point tungsten disc is joined to an iron or copper-based rivet via high-temperature brazing, effectively balancing arc resistance with the requirements for electrical conductivity and heat dissipation.
Product Characteristics
| Material Properties | Tungsten has a melting point of 3422°C, much higher than silver (962°C) and copper. This characteristic determines that when an electric arc is generated, the surface of Automotive Electrical Tungsten Contact Point for Horn only undergoes localized micro-melting without overall softening and loss. |
| Switching Properties | In speaker circuits, the contacts act as high-speed switches. Copper Tungsten Plate Contact Point utilize their high resistance to welding to ensure that the moving and stationary contacts do not stick together during the dozens of opening and closing cycles per second. |
| Surface Characteristics | The working surface of Copper Tungsten Contacts for Electric Car Horn has a fine granular texture or a slight oxide layer, which does not affect conductivity but rather reflects its resistance to ablation. |
| Compact Structure | Typically manufactured in disc, rivet, or rectangular shapes, with a thickness of only 0.5-2mm, it is suitable for the miniaturized design of modern speakers. |
Technical Features
Precision Powder Metallurgy & High-Ratio Forging
High-purity ultrafine tungsten powder is cold-pressed into a mold, followed by solid-phase densification in a vacuum sintering furnace at several degrees Celsius. Subsequently, multiple high-speed rotary forging passes are used to increase the billet density to near its limit for Electrical Tungsten Points for Car Horn.
Precision Grinding & Welding
After precision slicing of pure tungsten rods for Automotive Electrical Tungsten Contact Point for Horn, tungsten wafers are instantaneously and locally brazed with stamped low-carbon steel rivets in an automated resistance welding machine filled with protective gas at high temperatures.
Stress Relief Passivation
The Copper Tungsten Plate Contact Point undergo special vacuum tempering to remove internal stress in the weld heat-affected zone (HAZ), followed by chemical polishing and anti-oxidation treatment.
Product Advantages
Contact Resistance Stability
In 200,000 life cycles, the contact resistance change is less than ±15% of the initial value. Measurement Conditions: 10mA, 20mV dry circuit for Copper Tungsten Contacts for Electric Car Horn.
Arc Duration
Measured with an oscilloscope, the typical single arc duration is 0.2-0.4 milliseconds. Silver contacts typically have a duration of 0.6-1.2 milliseconds. Shorter arcs mean less material loss for Electrical Tungsten Points for Car Horn.
Anti-static Welding Capability
Under 12V, 15A, and 50g Automotive Electrical Tungsten Contact Point for Horn pressure, no welding occurs after 1000 consecutive operations. Under the same conditions, silver contacts exhibit occasional welding at 8-10A.
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If you are looking for a highly reliable Tungsten Contacts for Electric Car Horn solutions, or if you require material customization and engineering evaluation for specific operating conditions, please feel free to contact us for detailed technical specifications and sample support.
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