Design problems of heating pipes:

1. The junction of the cold end terminal and the resistance wire should not be at the bend of the heating tube. If the electric heating tube is bent here, the terminal will easily upturn, which will cause the electric heating tube's withstand voltage to be unqualified and the high voltage test to be unstable;

2. The terminal has not undergone heat treatment, and it is bent after the heating tube is made. Because it is hard, it is easy to be eccentric;

3. Reasonable selection of magnesium powder and heating pipes. Different magnesium powders and pipes should be selected for different temperatures, and a margin should be left;

4. The choice of resistance wire, 2080 resistance wire is better for high temperature tube, not OCR25A15, because aluminum precipitates at high temperature, which reduces insulation and high voltage;

5. Selection of sealing material for heating tube: epoxy resin, 704 silica gel, glass