Avoid contact between non-ferrous metals such as copper, aluminum, zinc, tin, lead, and the heating element. Whether in the form of fine powder, molten liquid, or vapor, their erosion at high temperatures is very harmful. This is because the eroded area forms "pits," reducing the cross-section, and eventually causing burnout due to overheating.High-temperature resistance wire in a pit-type carburizing furnace or when using a controlled atmosphere containing CO can cause carbon to become free, leading to short circuits. Therefore, the furnace door should be opened frequently, or compressed air should be used periodically for blowing and cleaning, so that carbon combustion products are burned off in time.
High-temperature resistance wire Before using the electric furnace wire, check the sensitivity of the temperature control system to prevent temperature failure, which could cause the furnace wire to burn out. The central and edge parts of the electric heating plate should use heating elements with different power ratings. Generally, the power of the heating element in the central part of the mold is slightly smaller, while the power of the heating element at the edge is slightly larger.
High-temperature resistance wire resistance and power. Calculate according to Ohm's law: I=V/R and P=I*V. If the resistance wire is too thin (low power), it will burn out. If the resistance wire is very thick but has low resistance, it will burn the wires and blow the fuse. It can be connected and work. Whether to connect other components mainly depends on the resistance and power of the resistance wire. Capacitors or resistors can be connected in series to reduce voltage, but be careful of electric shock, as the connection may be to a non-isolated power supply.
