# 3 Defects of Putting Nitrogen into Reflow Oven

_Published: 2019-01-09_

We have talked a lot about the defects of putting nitrogen into reflow oven before. Thus, today EBest Circuit (Best Technology) would like to discuss some defects of putting nitrogen in to the reflow oven with you.

[https://www.bestpcbs.com/blogimages/2019/01/07/reflow-oven.jpg](https://www.bestpcbs.com/blogimages/2019/01/07/reflow-oven.jpg)reflow oven

√ Nitrogen is very expensive.

√ If the heating effect is better, there will be tombstone effect happening on the resistance and capacitor. This effect is beneficial to most of components, but it will deteriorate the tombstone effect of the small chip.

√ Besides, the nitrogen will also increase the wicking effect of soldering tin, allowing the soldering paste along the fillet weld of the components to climb to a higher place. Maybe it is good for some fillet weld of components, but it is not friendly for some connectors. Because the fillet weld of connectors is the connected to other components. It will cause other problems if tin flows into these connections. What’s more, it will lead to short circuit if the tin climb to a higher place as the fillet welds of connectors are very closely.

[https://www.bestpcbs.com/blogimages/2019/01/09/pcb.jpg](https://www.bestpcbs.com/blogimages/2019/01/09/pcb.jpg)PCB with components

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