Elenco Soldering Station Manuel d'utilisateur télécharger pdf (Page 2)

SAFETY PRECAUTIONS

Like all electrical devices, the solder station must be

handled with care. The soldering iron and tip can reach

high temperatures and these simple safety rules should

be followed.

• Keep children out of reach of the soldering station.

• To protect your eyes, use safety goggles.

• Keep flammable material away from the soldering iron.

• DO NOT cool iron

by dipping it into any liquid or water.

• Always assume that the tip is hot to avoid burns.

• Work in an area that is well ventilated.

• Be careful that the hot soldering iron tip or the barrel

of the iron does not come in contact with any electrical

cord.

• Do not hold solder in your mouth. Wash your hands

thoroughly after handling solder.

• Locate soldering iron in an area where you do not have

to go around it or reach over it.

Almost every electronic device today has a printed circuit

board. Whether you are assembling a PC board or

repairing it, you must understand the basics of working

with these boards.

A poorly soldered joint can greatly affect small current

flow in circuits and can cause equipment failure. You can

damage a PC board or a component with too much heat

or cause a cold solder joint with insufficient heat. Sloppy

soldering can cause bridges between two adjacent foils

preventing the circuit from functioning.

Good soldering requires practice and an understanding

of soldering principles. This solder practice project will

help you achieve good soldering techniques, help you to

become familiar with a variety of electronic components,

and provide you with dynamic results.

Solder

For many years leaded solder was the most common

type of solder used by the electronics industry, but it is

now being replaced by lead-free solder for health

reasons. Lead-free solder contains 99.3% tin, 0.7%

copper, and has a rosin-flux core.

Lead-free solder is different from lead solder: It has a

higher melting point than lead solder, so you need higher

temperature for the solder to flow properly.

Recommended tip temperature is approximately 700°F;

higher temperatures improve solder flow but accelerate

tip decay. An increase in soldering time may be required

to achieve good results. Soldering iron tips wear out

faster since lead-free solders are more corrosive and the

higher soldering temperatures accelerate corrosion, so

proper tip care is important. The solder joint finish will

look slightly duller with lead-free solders.

Use these procedures to increase the life of your

soldering iron tip when using lead-free solder:

• Keep the iron tinned at all times.

• Use the correct tip size for best heat transfer. The

conical tip is the most commonly used.

• Turn off iron when not in use or reduce temperature

setting when using a soldering station.

• Tips should be cleaned frequently to remove

oxidation before it becomes impossible to remove.

Use Dry Tip Cleaner (Elenco

#SH-1025) or Tip

Cleaner (Elenco

#TTC1). If you use a sponge to

clean your tip, then use distilled water (tap water has

impurities that accelerate corrosion).

Flux

Most solder contains flux in the hollow core of the solder

allowing it to be applied automatically when you heat the

solder. The flux will remove any oxide film on the metals

soldered creating a good metal-to-metal contact. This

is called “wetting the metal”. There are three types of

solder fluxes: chloride, organic and rosin. In the

electronics industry, only the rosin type is used. Rosin

flux comes in two types, pure and active. The most

reliable is the pure type, since it doesn’t cause dendrites

between tracks on the PC board as the active type does.

Due to the highly corrosive and moisture attracting

characteristics of the chloride and organic type fluxes,

they should not be used in electronics.

Surface Preparation

In order for the solder to adhere to the connection, the

metals must be clean and free of nonmetallic materials.

Flux in the solder can remove oxides from metal but not

other materials like dirt or grease. To remove these, use

a small steel brush or fine emery cloth.

INTRODUCTION TO SOLDERING

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Elenco Soldering Station Manuel d'utilisateur Page 2

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