| | | hello to everybody, | | | we have a really satisfactory no clean process, both smt/reflow and wave soldering, but we get troubles with defects rework; | | | does anybody know how to eliminate flux residues or how not to produce them during rework operations? | | | Thanks to everyone. | | | g.d. | | | | | do you mean that u r having residues from your no clean process? | | and that during rework u produce residues? | | try changing to other flux, solder or solder paste supplier. | | during rework u need to use no clean stuffs too... if this is already what u r doing try above step. | | hope it might help. | | | | yes and thanks dreamsniper, | the problem is, above all, using rework materials (fluxes) because ,i think, yhat it is difficult to reach right decomposition temperatures such to eliminate white residues. | Obviously we don,t like using solvent for cleaning... ok? | thanks again. | g.d. | | Gian
You alarm me when you talk of white residues in a "no-clean" process. This should not happen. It sounds like you have compatibility problems between different residues and/or a poorly polymerised solder mask.
There exists on the market flux-cored wire specifically for what you are doing. Much of the 1.5% flux is sublimated, and the rest leaves a thin, clear, transparent, not-too-glossy residue which is almost invisible. As far as I know, it is compatible with many other products. The only caveat is that the operator must know how to use it, for best results.
Ciao
Brian
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