Common faults and troubleshooting methods of electric heating brazing furnace
04-23-2025 Author: KJ technology
The common faults and troubleshooting methods of electric heating brazing furnaces mainly include the following aspects:
1. Temperature control malfunction
Fault phenomenon: The temperature inside the furnace cannot reach the set value or fluctuates too much.
Possible reasons:
Thermocouple malfunction: Thermocouple wire breakage, damage, or incorrect installation position.
Temperature control instrument malfunction: The temperature control instrument is damaged or inaccurately calibrated.
Heating element malfunction: Heating element aging, damage, or insufficient power.
Exclusion method:
Replace thermocouple: Ensure that the thermocouple is intact and installed in the correct position.
Maintenance of temperature control instruments: Conduct maintenance or replacement according to the temperature control instrument manual.
Check the heating element: Check the resistance value of the heating element, replace the short circuited or open circuited heating element, and ensure that the power of the new element matches the voltage regulator.
2. Insufficient vacuum or leakage
Fault phenomenon: Unable to reach the maximum vacuum degree or vacuum degree drops.
Possible reasons:
Aging or damage of seals: Aging, damage or improper installation of seals.
Vacuum pump malfunction: Low pumping efficiency of the vacuum pump, oil contamination, or worn shaft seal.
Vacuum system leakage: There are leakage points in the vacuum system, such as poorly sealed valves, loose pipeline connections, etc.
Exclusion method:
Replace seals: Check and replace aging or damaged seals to ensure proper installation.
Overhaul vacuum pump: Overhaul or replace the vacuum pump to eliminate problems such as oil contamination and wear.
Leak detection and repair: Conduct leak detection on the vacuum system, identify the leak point and repair it, such as replacing valve sealing rings, tightening pipeline connections, etc.
3. Slow or unable to heat up
Fault phenomenon: The heating power cannot reach the rated value or cannot be heated up.
Possible reasons:
Magnetic regulator malfunction: Magnetic regulator malfunction causes unstable output voltage.
Heating element short circuit or open circuit: Heating element short circuit or open circuit causes inability to heat.
Unstable or phase deficient power supply voltage: Unstable or phase deficient power supply voltage affects the heating effect.
Exclusion method:
Repair magnetic voltage regulator: Check whether the wiring of the magnetic voltage regulator is loose, whether the contacts are normal, etc.
Check the heating element: Check the resistance value of the heating element and replace the short circuited or open circuited heating element.
Stable power supply voltage: Use a voltage regulator to stabilize the power supply voltage and check whether there is a phase loss problem in the electrical circuit.
4. Other faults
Fault symptoms: such as thermocouple burnout, decreased insulation resistance, vacuum valve switch failure, etc.
Possible reasons:
Thermocouple collides with carbon felt: Thermocouple burns out due to contact with carbon felt.
There are carbon fibers around the electrode: The presence of carbon fibers around the electrode leads to a decrease in insulation resistance.
Insufficient compressed air pressure: Insufficient compressed air pressure causes the vacuum valve to malfunction.
Exclusion method:
Eliminate heater interference: Ensure that the thermocouple does not come into contact with the carbon felt.
Remove carbon fibers: Remove carbon fibers around the electrode to increase insulation resistance.
Ensure air pressure: Ensure that the compressed air pressure is not less than the specified value, and repair or replace components such as solenoid valves.
