| Hi all, | | I thought I'd use this forum to ask a couple general questions on fluxes for manual operations: | First - Is it OK to use a wave soldering type flux (specifically OA)? Thinking about activation temperatures and the ramp rate of the wave solder versus a soldering iron. We really haven't seen any problems, but is there such a thing as a flux specifically made for manual operations? | Second - Using no-clean flux for the same processes; we had been using Kester's 951 but found problems cleaning off excess flux with alcohol. Talked to Kester's tech support and they acknowledged the product is not very soluble with the solvent. They also mentioned they are removing the statement that "hot DI water" can be used for residue removal from their tech sheets. Apparently, lab tests looked good, but "the real world" is seeing a white film. Since I want to keep a limited alcohol cleaning process, I'm leaning towards an RMA no-clean (like Kester's 1515). | Comments?? | | Thanks, | Dave | Dave,
We do a fair amount of customer modifications for our customers. So, we do a fair amount of hand soldering. If you are intent on using Kester products, try the '245' "no clean". It is actually a low solids rosin solder. We have very good results with it and depending on your application, you can leave the residue, or it cleans nicely with alcohol.(Talk to your rep... they are pretty helpful) I would advise you to stay away from any OA products unless you have a VERY GOOD cleaning system. ANY residues left on the board can cause reliability problems, particularly if the product is operated in damp locations.(namely corrosion and dendrite formation.) I find that you can learn quite a bit by talking with your supplier(s) Explain what you are doing, and what results you are trying to achieve. If they cannot help you, talk to another supplier.
Good luck!
John
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