09-08-2012, 04:48 PM
SOLDERING
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Building project in the proper manner is really an art, something which must be prectised and learned through trial and error, it is not all that difficult. The main thing is to remember to take each step slowly and carefully according to the instructions giving making since that everything at it should be before proceeding further.
TOOLS
The electronics workbench is an actual place of work with comfortably & conveniently & should be supplied with compliment of those tools must often use in project building. Probably the most important device is a soldering tool. Other tool which should be at the electronic work bench includes a pair of needle nose pliers, diagonal wire cutter, a small knife, an assortment of screw driver, nut driver, few nuts & bolts, electrical tape, plucker etc. Diagonal wire cutter will be used to cut away any excess lead length from copper side of P.C.B. 7 to cut section of the board after the circuit is complete. The needle nose pliers are most often using to bend wire leads & wrap them in order to form a strong mechanical connection.
MOUNTING & SOLDERING
Soldering is process of joining together two metallic parts. It is actually a process of function in which an alloy, the solder, with a comparatively low melting point penetrates the surface of the metal being joined & makes a firm joint between them on cooling & solidifying.
THE SOLDERING KIT
SOLDERING IRON:
As soldering is a process of joining together two metallic parts, the instrument, which is used, for doing this job is known as soldering Iron. Thus it is meant for melting the solder and to setup the metal parts being joined. Soldering Iron is rated according to their wattage, which varies from 10- 200 watts.
SOLDER
The raw material used for soldering is solder. It is composition of lead & tin. The good quality solder (a type of flexible naked wire) is 60% Tin +40% Lead which will melt between 180 degree to 200 degree C temperature.
FLUXES OR SOLDERING PASTE
When the points to solder are heated, an oxide film forms. This must be removed at once so that solder may get to the surface of the metal parts. This is done by applying chemical substance called Flux, which boils under the heat of the iron remove the oxide formation and enable the metal to receive the solder.
BLADES OR KNIFE
To clean the surface & leads of components to be soldered is done by this common instrument.
SAND PAPER
The oxide formation may attack at the tip of your soldering iron & create the problem. To prevent this, clean the tip with the help of sand paper time to time or you may use blade for doing this job. Apart from all these tools, the working bench for soldering also includes desoldering pump, wink wire (used for desoldering purpose), file etc.
HOW TO SOLDER?
Mount components at their appropriate place; bend the leads slightly outwards to prevent them from falling out when the board is turned over for soldering. No cut the leads so that you may solder them easily. Apply a small amount of flux at these components leads with the help of a screwdriver. Now fix the bit or iron with a small amount of solder and flow freely at the point and the P.C.B copper track at the same time. A good solder joint will appear smooth & shiny. If all appear well, you may continue to the next solder connections.