The thermal fatigue test of tungsten wire for halogen lamp is a complex and important process designed to evaluate the durability and stability of tungsten wire when it undergoes temperature changes. The following are the general steps for implementing the thermal fatigue test of tungsten wire for halogen lamp:
- Test preparation
Sample preparation:
Select tungsten wire for halogen lamp that meets the requirements as the test sample, and ensure that its size, shape and quality meet the test standards.
Perform necessary pretreatment on the sample, such as cleaning, degreasing, etc., to eliminate the influence of surface contaminants on the test results.
Test equipment preparation:
Prepare a high temperature test chamber or thermal fatigue tester, which should be able to accurately control the temperature and be able to quickly increase and decrease the temperature within the set temperature range.
Prepare measuring tools, such as thermocouples, resistance meters, etc., for real-time monitoring of the temperature and resistance changes of the tungsten wire.
- Test steps
Temperature setting:
Set the maximum and minimum temperatures of the test according to the working conditions and test standards of the halogen lamp.
Ensure that the temperature control accuracy meets the test requirements to avoid the impact of temperature fluctuations on the test results.
Sample installation:
Properly install the tungsten wire sample in the fixture of the test equipment to ensure good thermal contact between the sample and the fixture.
Adjust the position and angle of the fixture to ensure that the sample can be heated evenly during the test.
Thermal cycle test:
Start the test equipment and start the thermal cycle test. Generally, the thermal cycle test includes a heating stage, a heat preservation stage, and a cooling stage.
In the heating stage, the sample is quickly heated to the set maximum temperature and maintained for a period of time.
In the heat preservation stage, the sample is kept at the highest temperature for a period of time to simulate the long-term operation of the halogen lamp.
During the cooling stage, the sample is quickly cooled to the set minimum temperature and maintained for a period of time.
Repeat the above thermal cycle process until the predetermined number of cycles is reached or the sample shows obvious fatigue damage.
Data recording and analysis:
During the test, the changes in the temperature, resistance and other parameters of the sample are recorded in real time.
Analyze the data to evaluate the performance changes of the tungsten wire during the thermal cycle, such as resistance increase, breakage, etc.
According to the test results, draw a thermal fatigue curve to intuitively display the thermal fatigue performance of the tungsten wire.
- Precautions
Temperature control: Ensure the temperature control accuracy and stability of the test equipment to avoid the influence of temperature fluctuations on the test results.
Sample installation: Ensure good thermal contact between the sample and the fixture to avoid local damage caused by thermal stress concentration.
Data recording: Accurately record all data during the test for subsequent analysis and evaluation.
Safety protection: When conducting high temperature tests, necessary safety protection measures should be taken, such as wearing protective glasses, gloves, etc., to ensure the safety of the operator.
- Conclusion and application
The thermal fatigue test of tungsten wire with halogen lamp can evaluate the durability and stability of tungsten wire under temperature change conditions. The test results can be used to guide the design and manufacture of halogen lamps and improve the reliability and service life of products. At the same time, thermal fatigue testing is also one of the important means in materials science research, which helps to gain a deeper understanding of the thermal fatigue behavior and mechanism of materials.
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