How to Solder - Reflowing relay posts - Saab 9000 Bulletin Board - Saabnet.com
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How to Solder - Reflowing relay posts
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Posted by DanaH (more from DanaH) on Tue, 10 Dec 2013 08:57:00 Share Post by Email
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I thought this would be useful, its from a Volvo DIY site......

Soldering Tutorial......
To reflow the solder around the pins on a circuit board:

1. Use an electric soldering iron, with not more than 25 watts capacity (this limits risk of burn-out).
2. On the underside of the board, where the tips of mounting pins stick through the surface, touch the tip of the soldering iron to each pin for 1-2 seconds. NOTE: The break causing the problem likely is too small to be seen with the unaided eye (even with a magnifying glass). Thus, treat all of the solder joints on the relay and the main connector, as if any one could be the cause of the problem.
3. If any pin seems "dry", i.e., if it has no or very little solder on it, add a small amount of ROSIN core solder. Note that ROSIN core solder is NOT plumber's solder, which is acid core. Rosin Core solder is the only solder to be used on electrical/electronic work. Acid core solder should NEVER be used on electrical/electronic items: it will cause serious corrosion and ruin the device.
4. If the solder does not take - adhere - to the pin, clean the pin with some fine steel wool. Be sure to remove any steel wool fibers (blow them away) before applying solder.
5. Be careful not "to drag" solder between pins. That will connect pins, causing power to flow in undesirable ways, and possibly produce serious damage. If you put too much solder on a pin, clean the tip of the soldering iron with a damp cloth, and use the tip to attract and hold the excess solder.
6. Clean off excess flux with alcohol or water and a brush to prevent corrosion.

See also the excellent Heathkit discussion of soldering techniques for more information about how to solder electronic boards. [Tips from Jay Simkin]

posted by 170.63.74...

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