When using copper or brass, due to its relatively low maximum operating temperature, it is usually only used for immersion heaters and soft annealed copper pipes should not be used. For semi hard copper pipes, it is difficult to obtain sufficient insulation distance between the alloy resistance wire and the inner wall of the metal hall when filling with insulation powder, usually around 1mm.

For Cr18Ni8Ti and Cr25Ni20 heat-resistant pipes, they are mainly used as components, grills, and heating plates for elemental infrared radiators; In certain areas with high operating temperatures and corrosive conditions, such as the tubular electric heating elements used in washing machines, using this material is ideal.

Among commonly used pipes, Cr20Ni75 is a heat-resistant alloy pipe with good corrosion resistance.

No matter which material is used for the pipe, the inner surface should be thoroughly cleaned, and any material or residue is harmful to the insulation performance of the insulation material inside the pipe. When selecting tubular electric heating pipes for different devices, it is also necessary to consider the minimum thickness of the pipes. For example, the minimum thickness of tubular components on a horizontal device is 0.40mm; It is necessary to increase the thickness appropriately for tubular electric heating pipes used in particularly harsh situations.

An important parameter of electric heating wire is surface power. If the resistivity is too high and a certain current is applied, the surface power will also increase. So for low-power appliances, small diameter small current is chosen, but the size of the current depends on the size of the resistance, and the length and diameter of the heating wire are calculated.

After the electric furnace wire burns out, it can be connected and continued to be used. Due to poor contact, high contact resistance, and high temperature at the joint, it is more likely to burn out. Contact the two electric furnace wires together in multiple turns to increase the contact area and reduce the temperature. Burn or cut off a piece, with a shorter length and lower resistance than before. According to U2/R=P, the power will increase, so it is necessary to pay attention to safe use.