A. iron (commonly known as: spicy chicken)
Specifically responsible for soldering electronic components such as the purchase of 30-35W soldering iron will be enough. Wattage (W) the higher the temperature the greater the representative of iron.
Usually 30-35W soldering iron tip temperature of about 300 C. After the opening tip to wait about 5 minutes, only enough to tip temperature.

B. iron frame
Place the iron metal frame, has been with the sponge tip cleaner, when used to water on the sponge. Soldering iron warm up, please used in the welding
Before the tip on the sponge to clean it.

C. Solder Wire
Tin content to buy 60% or more of high-quality tin wire (the other 40% of lead and other impurities), the general line of the melting point of tin of about 180 C or so.
In general use, you should buy diameter 0.5mm - 0.8mm tin line.
High-quality line made out of tin solder joints will be reflective shiny; poor dull light.

D. welding knowledge
1 Not all metals are welded tin can. General electronic components of the "feet" are made of iron or copper, the surface is coated with a layer of nickel, to prevent
Oxidation (some senior will silver, even gold-plated), the above can be tin metal are Welding Electrodes, only it takes a special processed aluminum
To use tin soldering.
2. The principle is to be welded weld metal need to be heated to over 180 degrees (the melting point of tin line), the point on the tin line, it immediately dissolves into the liquid tin
Completely attached to the welded metal surface.
3, such as welded metal temperature high enough, it becomes semi-liquid tin semi-solid form, it can not be completely attached to the welded material, the formation of "false welding" "Weld" situation.
4 Therefore, the main cause is poor welding: welded metal wire temperature below the melting point of tin (180 degrees).

E. actual welding
1 First check the bottom of the solder joints and parts "feet" have no oxidation or stains, clean look if please. Backplane available eraser (mastic) clean;
Small Knife feet away parts available stains.
2 Insert the parts, spare parts to flat floor, try not to have the extra legs exposed.
3 Reverse floor see parts feet. (Parts may fall out, it is usually short of the first welding part (such as resistance), because it could be pressed
Table, will not fall out.)
4. Right hand soldering iron, solder wire with his left hand on the welding point.
Iron floor nozzle must have contact with the foot joints and parts, which aims to both heated to over 180 degrees is estimated that no two seconds, two
Temperature reached 180 degrees, tin line would be immediately dissolved into a liquid, completely surrounded by solder joints.
5 tin much or as little rule of thumb. Too easy to form bead-like; too little solder is not strong. Was the most perfect is the "pyramid" shape,
The figure shows that melting tin solder is wrapped round and round and parts of the foot, and pyramid.
Finally, the extra foot cut, welded.
6. Weld time must be completed within 5 seconds, because all the electronic components are very sensitive to heat, particularly transistors, diodes, etc. at any time due to
Overheated and damaged, be sure to pay attention.
7, such as welding of larger metal objects, may be heated more than 5 seconds or more, then can replace the larger wattage soldering iron, such as 60W to
100W, as used in the soldering 5 seconds to complete the action.

F. welding wire in the end plate techniques
1 wire and solder joints were first on the tin. (Very important step, if not the first, respectively, on the tin, they are not easy to weld together the)
(2) that the two welded together, without the period plus tin.

Summary of test machine:
One. Finished welding after connecting the power before to spare the following:
a. Carefully check that no wrong connection parts.
1 resistance: in particular, are easy to mistake, for example, 100Ω (dark brown brown), easy and 10KΩ (dark brown orange) or 100KΩ (dark brown yellow)
Confusion, please check carefully the clear.
2 capacitors: relatively simple, in part because of the value printed on, but to pay attention to the positive and negative electrolyte capacitor, such as the wrong tone is negative, the circuit still
Can work, but very easy to damage the capacitor 3. Diode: pay attention to polarity, the result is the wrong tone circuit is not working, and even burning parts.
4 transistor: pay attention to polarity, the result is the wrong tone circuit is not working, and even burning parts.
5. Zener diodes: 1N4148 diode appearance with close careful to see the text printed on the tube, and pay attention to polarity. 6 LEDs: dysregulated polarity, LED does not light, but not damaged.
7 infrared receiver diode: if the wrong tone polarity, there may soon burn.
8 Power: Very important, never pick the wrong polarity, wrong tone consequences may burn parts 9. Choke: CK-101 within a choke, short legs to be inserted on the floor marked the position , the circuit does not work if the wrong tone.

b. Carefully check the solder joints: 1. Check all solder joints are not "false Copper Welding Electrode" phenomenon!
2 Check the joints and there is no short circuit between the solder joints.

c. spare power connection only after the above effort.
1. Pay attention to whether there is sufficient battery power, and sometimes buy back the new battery may also be low.

Two the circuit does not work, what should I do:
a. Unplug the power to re-check.
b. Check the battery voltage.
c. suspected spot problems, heated soldering iron, solder and then solder each one, you can not add during the tin.
d. production failure, usually pick the wrong parts and poor welding! damaged part itself is low.

First, the welding principles

Soldering electronic components currently used mainly welding technology. Welding technology, the use of solder alloy of tin, at a certain temperature, melt welding, metal and tin atoms attract each other, the combination between the diffusion layer, penetration. The appearance of platinum and copper versions are smooth parts, they actually have a lot of tiny surface melt flow, the gap soldering solder bump surface diffusion, capillary suction through the formation and soldering, composition and printing plate tightly together , and has good electrical conductivity.

Soldering conditions: Soldering surface should be clean, grease, affect the welding, the metal can be tin solder wetting weldability, brass surface oxide film material, and can help welding flux, soldering surface, followed after the invasion, there must be appropriate temperature, the Welding Electrode material has a certain degree of mobility, to achieve this goal, but the soldering temperature is too high, it is not easy to shape, the welding quality of the oxide film.

Second, hand tools, or welding

The main tools are hand-welding or. There are many types or hydrothermal, induction linear, energy storage and tempering of power, 2OW type of bridge, 15W ..., primarily to determine the 300W variety of welding according to size. In 2OW general welding or undesirable transmission components, integrated circuits and sophisticated welding or energy storage components can be used when welding welding large a ~ 300W power can be WaiReShi or. Low-power or iron between 300-400 degrees Celsius, the head temperature.

Iron copper head used. Welding temperatures for the oxidation protection is not rust, often by electroplating process, the iron head is also the head of iron alloy materials used in some anti-oxidant. In the formal new iron before soldering tin processing. Method with spinning iron gloss paper, and then immersed in clean water, people on board solder rosin (eg, iron grinding repetition of canned every face if using a very long time, iron head has occurred, with a small file to the surface oxide layer of light, light copper and iron in the display after the new method when using only, you can head into the core of iron or different shades of the method of temperature regulation of the iron from the iron core head length, head of iron temperature, the higher the temperature is relatively low. You can also change the conditions of use to adjust the shape and size of the temperature of the tip, the higher the temperature of iron, rough, relative to the lower tip temperature.

You can select the appropriate element type according to the welding head shape of the iron. At the top of the first type, slope iron oval cone, chisel-shaped and so on. Can use a small cone-shaped solder joints, welded joints can be large cylindrical or reduced.

And a can or inhalation, direct heating or increased absorption body. Components in a circuit, should be removed or the.

Third, the welding materials: and the flux

Main ingredient solder. Soldering of electronic components, in fact, a solder alloy, a different proportion of tin lead solder melting temperature is different, usually 180 ° ~ 230 dollars. Most suitable for hand-welded steel pipe welding line, the line is, sandwiching a good rosin and catalyst, convenient to use exceptions. Tubular solder wire is 0.5 to 1.5 0.8,1.0, ... a variety of specifications can be relaxed.

Flow and flow, is a welding process can be heated metal surface cleaning and protection materials. Prone to air on the metal surface oxide film, oxide film to prevent penetration welding, the weld metal. Proper use of flux to remove oxide film, Copper Welding Electrode quality and more reliable, more smooth, round solder surface.

Magnetic flocculants, inorganic organic series and three series is rosin series, inorganic materials, but the most active metals are corrosive, electronic components, shall not be used for welding. Organic acid flux (such as plastic), but also a moderate positive B resistance. The most widely used is the rosin flux. Will melt into the alcohol (1) the formation of the rosin "water", when the solder joints with a dip in the resin can achieve good soldering results rosin help. Excessive dosage, or more membrane rosin soldering lost, to help clean up the weld after welding. Rosin flux in welding hard metal parts, can increase by about 4% hydrochloric acid alcohol two or three rubber adhesive (6%). As the market flux, must understand the composition and function of components, and corrosion before use. Do not blindly use, resulting in corrosion of components in its back.