The surface of the contactor core activated in the heat treatment of new energy circular contact is oily or greasy after a period of use. Wipe the anti-rust grease on the surface of the iron core. The surface of the iron core should be flat, but it should not be too bright, otherwise it is easy to cause delayed release. During the entire assembly process, it must withstand the high temperature of the preheat zone and the temperature transmitted to the terminal body through the wave soldering. The flux must not affect the terminals and must be easy to remove without any residue. The following new energy circular contact manufacturers organize the following four suggestions for you to deal with the high temperature shock caused by heat treatment:

First: the entire assembly process must be washable with water. Preheat temperatures often reach 100°C or higher, and peak temperatures of 280°C are not uncommon.
Second: The perforated solder pins must be accurately positioned, properly sized, placed evenly, and have good solderability, which facilitates insertion and soldering.
Third: In the whole assembly process, it must withstand the high temperature shock caused by heat treatment. In welding, infrared preheating and convection preheating are mainly used to conduct heat to the interface between the solder pin and the tin plate to melt the solder paste. The anti-welding performance of the contact is poor. When the motor is started or the line is short-circuited, a large current will cause the contact.
Fourth: the head is welded firmly and cannot be released, among which pure silver contacts are easier to weld. The main contact of the AC contactor should be made of silver-based alloys with strong welding resistance, such as silver-iron, silver-nickel, etc.