Precautions during heating in vacuum induction melting furnace:
1. Prevent heat-treated products (especially fine powder, melt or steam, etc.) from contacting electrical heating elements, especially copper, aluminum, zinc, tin, lead, etc., to prevent surface corrosion. Electric heaters form "pits" with smaller cross sections that overheat and blow out.
2. When testing the temperature uniformity of the furnace, please pay attention to the positioning and combination method of temperature measurement contact, as well as the space between it and the heating element. In a box resistance furnace, the furnace and bricks are usually cleaned (at least once a month) with a brush, broom or compressed air, vacuum cleaner, etc. To prevent impurities such as oxide scale from falling on electrical heating elements, circuits and even burning bricks. When heat resistant steel components, such as floor, crucible, furnace, etc., are used, lift and beat to remove the scale. If impurities such as iron oxide scale are not removed in time, they will melt and react with the firebrick, causing the furnace wire to melt.
3. After heating the vacuum furnace, the furnace door cannot be opened for a long time. When the temperature is higher than 400℃, do not cool quickly. Under the condition that the electric heating element has high temperature and the change of cold and heat is great, the oxidation stripping is simply caused. Regarding molybdenum heating furnace, during protection and application of EI, please pay attention to cooling to below 200℃ before intermittent protection of gas.
4, the lead rod should adhere to excellent contact with the wire clip, and the lead rod should adhere to lubrication when contact with the wire clip. Guide rod shall not redness, and the temperature of wire clamp during power supply shall not exceed 60°C. Please note that due to thermal expansion, shortening and creep elongation during temperature closure, the bolts of the outlet clip simply become loose and form a virtual short circuit, which should be checked and tightened regularly.