The fitting degree of thermocouples pasted on the surface of industrial workpieces directly determines the authenticity and accuracy of wireless furnace temperature test data. In actual overseas industrial testing work, many temperature curve distortion and data abnormality problems are not caused by equipment quality faults, but by unstandardized pasting operation of thermocouples. The solder joint is not closely fitted and suspended, which will lead to abnormal temperature jump of the test curve and seriously affect the analysis and judgment of production process parameters.
The core requirement of thermocouple pasting operation is to achieve zero-gap close fitting with the workpiece surface. When testing the furnace temperature of processing workpieces, the thermocouple solder joint, as the temperature sensing core point, must be completely attached to the surface of the tested workpiece without shaking or suspension. If the solder joint is suspended inside the furnace and not closely fitted with the workpiece, it will sense the temperature of the furnace gas instead of the actual processing temperature of the workpiece, resulting in inconsistent test data and real production temperature, which loses the guiding significance of furnace temperature detection.
The suspended contact of thermocouple solder joints is easy to cause abnormal jump of temperature curve. When the unfixed solder joint shakes randomly in the furnace, it is easy to accidentally contact the surrounding metal parts of the workpiece. Instant contact between the thermocouple solder joint and metal will generate instantaneous induced voltage, which interferes with the normal thermoelectric signal transmission. This instantaneous interference will cause the test temperature to rise sharply in a short time, forming an abnormal peak on the temperature curve.
Abnormal temperature jump will further affect the overall analysis of test data. The sudden high-temperature peak will force the Y-axis coordinate of the test analysis software to automatically increase to adapt to the peak data. After the coordinate range is enlarged, the normal temperature change curve of the whole testing process will be compressed and become very small, resulting in unclear curve trend, unable to accurately observe the temperature rise, constant temperature and temperature change law of the workpiece, unable to effectively evaluate the rationality of the furnace temperature process, and seriously affecting the production process optimization work.
Standardized pasting and fixing methods can completely solve the problem of curve distortion. Before the furnace temperature test, ensure that the workpiece surface is clean and flat, fix the thermocouple solder joint closely on the workpiece surface with high-temperature adhesive tape or high-temperature fixing glue, and arrange the wire body neatly to avoid suspension and shaking. After the fixation is completed, check the fitting degree of the solder joint again to ensure no virtual contact. This standardized operation can ensure that the test data is true and effective, the curve is smooth and regular, provide accurate data support for industrial process detection, and ensure the standardization and effectiveness of overseas furnace temperature testing work.
