Reflow Soldering Basics

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Founder and CEO of Neoden USA, Peter Swann, explains the basics of reflow, and its importance in maximizing the potential of your SMT manufacturing setup.
00:00 -- Introduction
00:31 -- What is "reflow"?
01:09 -- What is solder paste?
02:35 -- Preheat phase
04:05 -- Soak phase
04:47 -- Reflow phase
05:24 -- Cooling phase
05:46 -- Temperature setting considerations
06:40 -- Conveyor vs. drawer-style oven
07:22 -- Stencils, and consistent solder application
08:06 -- Finished board comparisons
Sources:
1. Solder paste under microscope -- Wikipedia user Autopilot, Creative Commons Attribution-ShareAlike 3.0 Unported license (creativecommons.org/licenses/...)
2. T-size chart -- Tony Lentz, SMT 007 Magazine (smt.iconnect007.com/index.php...)

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Опубликовано:

4 июл 2024

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Комментарии : 10

@magjagmagjag 11 месяцев назад

Very good explanation...

@MitchDavis2 2 года назад

Excellent video! Do you have any pointers on how to get components to “snap” into place? When I reflow boards by hand with a heat gun, they tend to “snap” in place, even if they were slightly crooked. With the IN6 reflow oven, they tend to solidify in place, which is pretty annoying if something like a microcontroller is slightly crooked.

@NeodenUSA 2 года назад

Thanks for the feedback, Mitch! The rapid snapping action when using a heat gun comes from the rapid liquefaction of the solder, which is caused by very high air temperature. The oven will heat more gently to assure that components don’t get damaged. This tends to cause less pulling. While the snapping action is satisfying, it isn’t good for yield, so accurate placement is important.

@paulgallagher2937 6 месяцев назад

@@NeodenUSA Yes. There is a fallacy that components will magically float into the correct position. A little of that will happen, but only if you are lucky. You need to assume the components will not move during reflow, and in fact it is preferred that they don't move. Accurate placement is essential.

@NeodenUSA 2 года назад

8:20 -- In addition to the obvious color difference, it should also be noticed that on a board that doesn't reach the specified temperature, you may notice that the parts aren't completely embedded in the solder

@ahcalori2 2 года назад

I have a Neoden IN6, but the settings menu confuse me a little bit. How can I set the temperatures in the six zones. For instance, zones 1 and 2 must have the same temperatures as you shown on video? And zone 3 equal to zone 4; and zone 5 equal to zone 6? Thanks for the excellet video!

@NeodenUSA 2 года назад

In the display for the IN6 the zones are not numbered at all. There are three top zones and three bottom zones. You can use the built in profiles as a starting point for temperature settings, but you should follow the procedure in the video for checking the profile graph to get a consistent result.

@ahcalori2 2 года назад

@@NeodenUSA Thanks! I think I'm getting consistent results on profile simulation! I'll test it with a pcb!

@paulgallagher2937 6 месяцев назад

The guy applying the solder by hand on the stencil looked like he was buttering toast. Worst technique possible.