ELECRAFT SOLDERING TIPS

Source: web.media.mit.edu
Topic: SAP Tutorial

Short Desciption:
usually originate in plants such as pine sap and are not water soluble. ... A naturally occurring resin usually associated a component of pine sap. ...

 

Content Inside:
ELECRAFT SOLDERING TIPSPage 1SOLDERING TIPSby: Tom Hammond NSSGood equipment and a good soldering technique are both essential to successfulassembly of any device. Please read these tips before you start.TOOLS YOU'LL NEED1. Temperaturecontrolled soldering station with a fine tip for use with printed circuitboards. Ordinary (nontemperaturecontrolled) soldering irons will often produce very poorresults when soldering or desoldering components especially when working with doubleside printed circuit boards. They simply cannot provide (and maintain) enough heat whensoldering to large foil areas or when several joints are soldered in rapid succession.Tip width will normally be in the range of 1/32" (0.79mm) through 1/8" (3.2mm)depending upon the width of the pad to which you are soldering. The width of the tipselected should be about 75% to 90% of the width of the pad.If the heat range of the tip is specified by temperature choose those with a 600 F to 700F (315 C to 370 C) rating.Though some applications may require the use of a 'conical' pointed tip a 'screwdriver'or 'chisel' style tip is generally preferable because it offers more contact (heating) surfaceagainst the joint.2. The right solder. Mildly active rosincore 0.020" (0.5mm) to 0.035" (0.98mm) diametersolders with 63/37 or 60/40 TinLead (SnPb) content will work best. Smalldiameter solder(.020") is preferable when working with doublesided PC boards with platedthru holesbecause it allows easy regulation of the amount of solder you apply to each connection.Silvercontent solder (generally 2%) may sometimes be specified. While silvercontentsolders 'flow' more smoothly and make a stronger joint they also require more heat andare more difficult to remove when desoldering a joint for component replacement. Moreheat means a better chance of damaging a PC board trace by 'lifting' the pad because theadhesive used to attach the pad to the PC board material has been overheated. Usesilvercontent solde ...

 

 

 

 

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