Nitrogen reflow soldering is to fill the reflow furnace with nitrogen in order to prevent the air from entering the reflow furnace to prevent the element angle oxidation in reflow welding.The use of nitrogen reflow soldering is mainly to enhance the quality of welding, so that welding occurs in an environment with very little oxygen content (100PPM) or less, which can avoid the oxidation problem of components.Therefore, the most important thing for nitrogen reflow soldering is to ensure that the oxygen content is as low as possible, and the purity of nitrogen is generally greater than 99.99%.

Nitrogen reflow soldering has the following advantages:

(1) Effectively inhibit the oxidation of solder

(2) Improve the welding wetting force and speed up the wetting speed

(3) Reduce the generation of tin balls, avoid bridging, reduce welding defects, and obtain better welding quality

(4) It can use a solder paste with a lower active flux, while also improving the performance of the solder joint and reducing discoloration of the substrate.