Here's an LED I reflowed earlier today using my homemade oven:īTW, the pad layout for the LED above is exactly as specified in the datasheet for the LED. Personally I use a nice low-temperature one (138☌ melting point) with my home made "toaster oven" reflow oven (ChipQuik SMDLTLFP) in a syringe. It's not expensive (well, it is, but you use such small amounts a little goes a long way). If you're going to reflow you really should be using paste. Solder paste is made from millions of little tiny beads of solder suspended in flux. You need flux for the solder to flow onto the metal of the component. Solder contains flux in the core, but that burns off as you melt it onto the pad leaving just (almost) pure solder behind. Without the flux the solder won't flow into the components properly. If you must use solder instead of solder paste then you really need to ensure that there is plenty of flux on and around the pads when you reflow.
REFLOW SOLDERING OVEN HOW TO
I'm wondering if anyone has any explanation or suggestions about how to improve? Maybe I need to increase the temperature? Or hold the temperature a little longer? They are within 1cm on the board and I don't believe would have significantly different temperatures. The LEDS are very slightly thicker I suppose. There was no difference in the preparation. The components are all about the same size and have similar contacts. They all just about have proper electrical contact so the board "works" but they are very poor indeed. They are positioned well and the solder looks good. I cleaned the board with liquid flux before applying the solder and again after applying solder (In one case - I had similar results when I didn't do this second clean) In this case I've put a little solder on the pad using a soldering iron, positioned the components on the pads and then re-heated in the oven. As a test I made a simple board with 8 resisters and 8 LEDS. The problem I have is that I'm getting inconsistent results depending on the component.
The controller uses a thermocouple to measure and control the temperature profile. I've been using a halogen oven with a home made controller as a simple reflow oven.
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