•Wattage means the amount of heat capacity available at the tip.•Iron-clad tipsare the best selection for soldering printed circuit boards. Anunplated tip will provide better heat transfer but wears rapidly and requiresfrequent cleaning and tinning. The iron-clad tip requires only an occasionalcleaning and tinning.11/30/201718
Different Types of Soldering Iron Tip•Soldering iron tips come in a wide variety of shapes and sizes to meet aspecific application. Many soldering irons have replaceable tips. The tipselected should provide maximum contact area between the surfaces to bejoined and also allow accessibility to the connection. Typically a small beveltip is preferred for general printed circuit board work11/30/201720
Tinning and Idling •Maintaining the soldering iron tip is essential for proper soldering. Use anantiseize compound when installing the tip to prevent it from becomingfrozen. Make sure the tip is fully installed in the heating element. Clean thetip with steel wool prior to heating it. Heat the tip and apply solder asit warms up.Applying solder to the tip is calledtinning.•Rest the soldering iron on a stand to remove excess heat from nontemperature controlled soldering irons. This is referred toidling.Wipethe tip of the soldering iron across a damp sponge or tip cleaner to clean itof any oxidation prior to soldering.11/30/201721
Soldering a PCBFirst, wipe the tip of the soldering iron on a damp sponge.Then place a small amount of solder on the tip and apply the tip tothe connection to be soldered. Solder should not be applied until theconnection becomes hot enough to melt the solder. How long this takes isquickly learned by a few trials and errors.Keep the tip of the soldering iron on the connection for a few secondslonger, and then remove it. Do not disturb the newly made connection until ithas had time to solidify. A good solder connection will be bright and shiny11/30/201722
De Soldering•Remove the solder from the PCB is known as de-soldering.•Desolderingrequiresspecialimplements:desolderingbraid,desolderingbulb,desoldering pump, combination bulb and soldering iron, and desoldering station•Thedesoldering bulbuses a bulb and a teflon tip. Squeeze the bulb and apply thetip to the melted solder; releasing the bulb draws up the molten solder•A variation of the desoldering bulb is a spring loadeddesoldering pump.It works bydepressing a plunger until it locks. To suck up solder, press the release button. Thespring forces the plunger up rapidly, creating a vacuum.•The combination rubber bulb and soldering iron uses a hollow tip to suck up thesolder11/30/201723
Soldering Defects Two of the most common soldering defects are: Cold solder connections Disturbed or Fractured connections.
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- Summer '17
- Printed circuit board, Solder