STM nitrogen making machine
SMT nitrogen machine combines the characteristics of lead-free soldering in SMT industry. Its purity is generally between 99.9% and 99.999%. The flow rate of nitrogen equipment matched with each welding furnace is generally 10-30Nm3/hr (calculated according to the actual flow rate of special specifications). The dew point is - 40 ~60 C, and the nitrogen pressure is about 0.5-0.6MPa. Solution of SMT special nitrogen gas can ensure correct activation of flux, reduce residual flux, enhance welding quality and make welding surface more beautiful.
Nitrogen demand in lead-free electronic assembly：
1) When using high temperature solder paste or low solid, low activity (no cleaning, low residue) solder paste；
2) When brazing more expensive integrated circuit components, small volume components, fine spacing components, flip chip and non-retrofittable components；
3) Multiple reflux of PCB with OPS coating during assembly or brazing；
4) Brazing of unprotected copper pads or PCBs with long storage time or reliability first。
Nowadays, lead-free production in the global electronic manufacturing industry is beginning. In order to meet the lead-free standard, more and more manufacturers choose new reflow soldering furnaces with nitrogen welding protection.
