17-09-2012, 01:02 PM
Soldering & De-soldering
Soldering_Desoldering.ppt (Size: 2.23 MB / Downloads: 272)
Solder
Solder is an alloy of tin and lead.
The solder used for electronics is frequently called 60/40 solder because it is made of 63% tin and 37% lead.
60/40 solder melts at 361 F.
Lead-free solder: As of July 1st, 2006, European laws mandated that new electronics be entirely lead-free. As of yet, no such laws exist in the United States.
Soldering Iron Care & Maintenance
A soldering iron must be coated with a thin coat of solder. This will allow for the transfer of heat to the work piece.
This procedure is called tinning.
The tip must be kept coated with a shiny layer of solder by occasional wiping and applying solder directly to the tip.
Solder Process
Heat both items at the same time by applying the soldering iron to the copper pad and the component lead.
Continue heating and apply a few millimeters of solder. Remove the iron and allow the solder joint to cool naturally.
It only takes a second or two to make the perfect joint, which should appear shiny.
Soldering Safety
Wear safety glasses when soldering. This includes all individuals in the vicinity of someone who is soldering.
Place soldering iron in an approved holder when not in use. The iron is hot and can cause burns.
Place the soldering iron so that the cord does not get caught up in your arms or on others.
Ensure access to proper ventilation.
Verify that the type of solder is safe to use in your working environment.
Secure the components to be soldered before beginning the soldering process.
Tie back long hair and remove or tuck loose clothing.
Use heat sinks for heat-sensitive parts. Provide sufficient cooling time before removing parts.
Do not flick solder off of the iron. Flicking can cause solder to spray and hit skin or eyes.
Hold the scrap end when cutting excess leads so that the scrap lead is not thrown into the air.
Cut leads evenly with wire cutters.
Make sure that leads do not short across other traces or leads.
Thoroughly wash your hands after handling solder.