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Does Flux Volume Impact Solderability?Board Talk
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TranscriptPhil Jim Phil Jim Phil Jim If you have poor solderability, you should be dealing with that up front, not trying to solve it in the wave solder machine. With a water-soluble flux, you can use a stronger flux and maybe use a little more, but make sure you preheat it properly. But you should be cleaning before you go to in-circuit test. So if I read this correctly, if you have flux reside, that means you're using a no-clean and you should use what the manufacturer recommends. Joe, do you want to talk about the best way to make sure that you're using the right amount of flux while wave soldering? Joe So the way that volume usage is checked is usually by weighing the circuit board assembly before and after. The second thing is to find out if the flux has been applied in the right place. The key here, is hole fill because the real problem with waste soldering is top-side hole fill, especially with thick, multi-layer boards that are lead-free. So what do we do? There's many sophisticated tools on the market which you can research and they're wonderful tools. One way to get started is just to take two boards with no components and put a piece of paper in between them, like a paper sandwich. You run this board sandwich over the wave system then then take the boards apart. You examine the paper to see if you got penetration of flux up through the holes onto the paper. This will ensure that you've got enough flux in those holes to get proper topside fillets. There are many ways to apply flux. We have spray, we still have people using a static method, such as foam fluxing and wave flux, so all those things have to be put into consideration, but the key is to get the right amount of flux and get it where you need it. Jim Phil Jim Phil |
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