The precursors of tungsten wire fatigue fracture mainly include the following aspects:
Tungsten wire becomes thinner: During long-term use, due to high-temperature evaporation and current, the tungsten wire will gradually become thinner. This is an obvious precursor to tungsten wire fatigue fracture, because the thinned tungsten wire will weaken its ability to withstand current and mechanical stress.
The inner wall of the bulb becomes black: As the tungsten wire evaporates, tungsten atoms will be deposited on the inner wall of the bulb, causing the inner wall of the bulb to become black. This not only affects the brightness of the bulb, but also reflects the loss of the tungsten wire. When the inner wall of the bulb becomes severely black, it often means that the tungsten wire is close to the edge of breaking.
Increased thermal stress:
Every time the bulb is lit and extinguished, the tungsten wire undergoes a process of heating and cooling, causing it to expand and contract continuously. This process produces thermal stress, especially in the thinner areas of the tungsten wire. Over time, the accumulation of thermal stress will cause metal fatigue of the tungsten wire, which will cause fracture. Therefore, if the bulb is frequently lit and extinguished, or the temperature of the working environment changes greatly, it may accelerate the fatigue fracture of the tungsten wire.
External vibration or impact:
When the bulb is subjected to external vibration or impact, the tungsten wire may be brittle and The tungsten wire is too high and breaks. Especially when the light bulb is powered on, the tungsten wire has been heated to a fragile state, and sudden impact is more likely to cause damage. Therefore, when installing and using the light bulb, care should be taken to avoid excessive vibration or impact on the light bulb.
Current fluctuation:
Unstable current or voltage fluctuations may also affect the life of the tungsten wire. If the current is too high, the temperature of the tungsten wire will rise faster, aggravating the evaporation and damage rate of the tungsten wire, thereby shortening the life of the light bulb. Therefore, when using the light bulb, the current and voltage should be kept stable as much as possible.
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