The energy required Qto change the phase of a substance of mass m with L v as the latent heat of vaporization (which we can get from Fig 1), is given by For this DIY Vapour Phase Soldering project I use LS230. Fig 1įig 1 shows us some of the properties of different Galden fluids. This “invisible” energy is called latent heat and it actually stores a lot of energy. This is why water will remain at a constant 100 ☌ until it has completely boiled off. This extra energy does not increase the temperature of the medium it just provides the energy for the phase change, it’s therefore an “invisible” energy. Simply, energy is required by a medium to change from a liquid to a gas once it has reached boiling temperature. The idea is to use the LATENT HEAT stored in the vapour of a Galden fluid to heat up the PCB. So I set out to see if DIY Vapour Phase Soldering was possible at home. I wanted to answer the question over whether or not there were alternatives out there other than cheap IR reflow ovens for home/hobby use, that can reliably produce acceptable results. There are also articles online of inadequate grounding on some of the cheaper models and other corner/cost cutting shenanigans. Affordable reflow ovens use IR to heat up the PCB, this works, but IR will favor darker components and cause hot spots on the PCB, a lot of tweaking is required on cheap models to get them to perform optimally. While doing research for an “affordable” reflow oven for home/hobby use that can reliably and accurately solder complicated parts, I came to the conclusion that there’s no such a thing. BGA’s are hard to solder at home, you can’t see what’s going on undereneath unless you use sophisticated X-ray machines and you are very much at the mercy of your reflow oven and its capabilities. I’m all for progress, however one undeniable side effect is that we are seeing more and more BGA packages out in the wild. The miniaturization of components is essential as consumers demand better, faster and more power efficient in smaller and smaller packages. Need a motor driver, no problem need a sophisticated power management controller, no problem, the march of progress is relentless. With the electronics industry expanding rapidly there is now virtually an IC available for every conceivable use case. Here, we will explore the theory, try it in practice and look at the results. Vapour Phase Soldering has been around for a long time, the earliest reference I can find dates back to 1987.
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