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7.1 SOLDERING TIPS AND TECHNIQUES
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iron will have to be applied to the joint in order to melt the solder and could result in poor solder joints as well as an increased amount of heat being passed to the component. As discussed in the following, the iron should only be in contact with the component s leads for a few seconds, much less than the amount of time required to damage the component. 7.1.2.5 Cleaning supplies It is often necessary to clean up before and after you solder. Isopropyl alcohol makes a good, all-around cleaner to remove flux after soldering. After the board has cooled, flux can form a hard surface that is difficult to remove. The best way to clean a circuit board is to use isopropyl alcohol in an ultrasonic cleaner, but you can also use a denture brush (which has much stiffer bristles than an ordinary toothbrush) with isopropyl alcohol as well. 7.1.2.6 Solder vacuum and solder braid These tools are used for removing excess solder and removing components after they have been soldered. Desoldering (removing components that have been soldered to a board) is a tricky process that even with a lot of skill can result in a damaged circuit board and components. To minimize the need for desoldering, you should take care to ensure the correct components are being soldered in the correct orientation and use sockets instead of soldering wherever possible.
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7.1.3 HOW TO SOLDER
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The basis of successful soldering is to use the soldering iron to heat up the work, whether it is a component lead, a wire, or whatever. You then apply the solder to the work. If the solder doesn t flow onto the joint, then check the iron s temperature, add a bit more rosin core solder or even add a bit of liquid flux. Once the solder flows around the joint (and some will flow to the tip), remove the iron and let the joint cool. The joint should look smooth and shiny. If the solder appears dull and crinkly, then you have a cold joint. To fix the joint, apply the soldering iron again to remelt the solder. Avoid disturbing the solder as it cools; a cold joint might be the result. Do not apply heat any longer than necessary. Prolonged heat can permanently ruin electronic components. A good rule of thumb is that if the iron is on any one spot for more than 5 s, it s too long. If at all possible, you should keep the iron at a 30 to 40 angle for best results. Most tips are beveled for this purpose. Apply only as much solder to the joint as is required to coat the lead and circuit board pad. A heavy-handed soldering job may lead to soldering bridges, which is when one joint melds with joints around it. At best, solder bridges cause the circuit to cease working; at worst, they cause short circuits that can burn out the entire board. When soldering on printed circuit boards, you ll need to clip off the excess leads that protrude beyond the solder joint. Use a pair of diagonal or nippy cutters for this task. Be sure to protect your eyes when cutting the lead.
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7.1.4 SOLDER TIP MAINTENANCE AND CLEANUP
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After soldering, wipe the hot tip on the solder sponge to remove any excess solder, flux, and contaminants. Then let the iron cool. After many hours of use, the soldering tip will become old, pitted, and deformed. This is a good time to replace the tip. Old or damaged tips impair
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ELECTRONIC CONSTRUCTION TECHNIQUES
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the transfer of heat from the iron to the connection, which can lead to poor soldering joints. Be sure to replace the tip with one made specifically for your soldering iron. Tips are generally not interchangeable between brands.
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