Oxidation during reflow is a common problem that can cause loose or broken connections between solder joints and circuit boards. Oxidation is especially serious when too much oxygen enters the reflow oven. To solve this problem, we can use nitrogen reflow technology.

Nitrogen reflow soldering is in the reflow furnace chamber filled with nitrogen, blocking the reflow furnace air into the components to prevent the foot oxidation, can enhance the quality of welding. In nitrogen reflow soldering, the gas collection point has at least one, high-end nitrogen reflow soldering gas collection point has more than three. Practice has proved that below 1000PPM wettability will be very good, commonly used is 1000-2000PPM nitrogen.

In the reflow soldering process, the control of temperature and time is critical. Preheating, heating and cooling phases are critical steps in reflow soldering, and the temperature profile, heating rate and cooling rate are key to control. Selecting the proper solder paste is also critical.

In addition, regular maintenance of reflow soldering can extend service life, ensure proper operation, and improve productivity and product quality. Before maintenance, you need to prepare a hoover, dust-free paper, rags, brushes, iron brushes, cleaners, furnace cleaner, high-temperature chain oil, rust preventive oil, alcohol and so on. Reflow soldering routine maintenance includes cleaning the appearance, check the automatic oiler and transport inlet and outlet photoelectric switch surface for foreign objects. Major maintenance requires reflow soldering to stop and cool down to room temperature, clean the extraction exhaust pipe, drive sprocket dust, furnace chamber inlet and outlet, etc., clean the filter, check the hot air motor, transport chain, extraction box, etc., and check the lubrication of each place regularly.

In general, the oxidation problem in reflow soldering can be solved by nitrogen reflow soldering technology, precise control of temperature and time, regular maintenance and other methods. These methods can effectively prevent oxidation, improve the quality of welding, extend the service life of the equipment, ensure normal operation, and improve production efficiency and product quality.