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The Knowledge and Know-how Connection
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June 19, 2013
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We plan to install a nitrogen environment around the wave soldering tank to reduce oxidation. Is this likely to improve our defects-per-million level?
Board Talk is presented by ITM ConsultingVisit ITM Consulting to learn more.Phil Zarrow, ITM ConsultingWith over 35 years experience in PCB assembly, Phil is one of the leading experts in SMT process failure analysis. He has vast experience in SMT equipment, materials and processes. Jim Hall, ITM ConsultingA Lean Six-Sigma Master Blackbelt, Jim has a wealth of knowledge in soldering, thermal technology, equipment and process basics. He is a pioneer in the science of reflow.
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Views: 1763
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A slight clarification on one benefit of nitrogen. It increases wetting forces (a good thing) while also increasing surface tension (not so good) unless your wave is specifically designed for nitrogen and is set up properly.
Don't let customers get fooled into thinking that just plumbing nitrogen in or around a wave will make it inert. Years of trials and tribulations (as well as patents) went into insuring that when and where nitrogen was input into a system yielded an inert soldering environment. My 2 cents.
Ray Chartrand, CharTrain Consulting, USA
Thank you for bringing this issue to the Board Talk. Phil, you should see more benefits of nitrogen in reflow. I am sure you will be surprised. In wave soldering, using our system (ALIX Inertwave) that is already installed in more than 800 machines around the world, you can reduce dross formation in more than 80%. Flux consumption the reduction is near 40%. We use heated gas with our HT system (TM). The heated gas improve yield (better soaking and heat transfer). The savings are fantastic comparing with air processes. But be careful, it is not a matter of just injecting nitrogen. The goal is atmosphere CONTROL. Improved wettability (barrel filling), better surface tension (less shorts and bridges) and with less flux, less dirtiness on the PC board and in your machine. Cleaning time (dross on solder pot) reduced in over 80%. Quality gain and savings all together.
Luiz Felipe Rodrigues, Air Liquide, Brazil