Instructions for use of constant temperature electric soldering iron
First, the treatment of the new constant temperature electric soldering iron before use:
The new constant temperature electric soldering iron can be used normally after coating the soldering iron tip with a layer of solder before use. After the constant temperature electric soldering iron is used for a period of time, a layer of oxide layer will be formed on the blade surface of the soldering iron tip and around it, which will cause "tin eating" "Difficult phenomenon, at this time the oxide layer can be filed off and re-plated with solder.
Second, the grip method of the constant temperature electric soldering iron:
a. Reverse grip method: use five fingers to hold the handle of the constant temperature electric soldering iron in the palm. This method is suitable for high-power constant-temperature electric soldering iron, welding parts with large heat dissipation.
b. Forward grip method: Hold the handle of the constant temperature electric soldering iron with four fingers except the thumb, and press the thumb firmly along the direction of the electric soldering iron. The electric soldering iron used in this method is also relatively large, and most of them are curved soldering iron tips.
c. Pen holding method: holding a constant temperature electric soldering iron is like holding a pen, suitable for small power electric soldering iron, welding small welded parts
3. Welding steps:
During the soldering process, the tools should be placed neatly, and the constant temperature electric soldering iron should be held firmly and aligned. For general joint welding, it is best to use tubular solder wire with rosin. Hold the handle of the constant temperature electric soldering iron in one hand and the solder wire in the other.
a. One method is to quickly touch the heated and tinned soldering iron tip to the cored wire (cored wire), then contact the solder joint area, use the molten solder to help the initial heat conduction from the soldering iron to the workpiece, and then put the tin wire Move the soldering iron tip away from the soldering surface.
b. One method is to touch the soldering iron tip to the pin/pad, put the tin wire between the soldering iron tip and the pin to form a thermal bridge; then quickly move the tin wire to the opposite side of the soldering point area.
However, in the production process, there are usually damages to the PCB or components caused by the use of improper temperature, too much pressure, prolonged residence time, or the combination of the three.
4. Precautions for welding with constant temperature electric soldering iron:
a. The temperature of the soldering iron tip of the constant temperature electric soldering iron should be appropriate. Different temperature soldering iron tips will produce different phenomena when placed on the rosin block. Generally speaking, the temperature when the rosin melts quickly and does not emit smoke is more suitable.
b. The welding time of the constant temperature electric soldering iron should be appropriate. From heating the soldering point to melting the solder and filling the soldering point, it should generally be completed within a few seconds. If the welding time is too long, the flux on the soldering point will completely volatilize, and the fluxing effect will be lost. If the welding time is too short, the temperature of the welding point will not reach the welding temperature, and the solder will not be fully melted, which will easily cause false welding.
c. Solder and flux should be used in an appropriate amount. Generally, too much or too little solder and flux on the soldering point will have a great impact on the welding quality.
d. Prevent the solder on the soldering point from flowing freely. The ideal welding should be that the solder is only soldered where it needs to be soldered. In the welding operation, the solder should be less at the beginning. After the soldering point reaches the soldering temperature and the solder flows into the gap of the soldering point, the solder is added to complete the soldering quickly.
e. Do not touch the soldering point during the soldering process with the constant temperature electric soldering iron. When the solder on the soldering point has not completely solidified, the soldered device and wire on the soldering point should not be moved, otherwise the soldering point will be deformed and a virtual soldering phenomenon will occur.
f. When soldering with a constant temperature electric soldering iron, the surrounding components and wires should not be scalded. When soldering, be careful not to let the electric soldering iron burn the plastic insulation layer of the surrounding wires and the surface of the components, especially for products with relatively compact welding structures and complex shapes. .
g. After welding, do a good job of cleaning after welding in time. After welding, the cut off wire ends and tin slag dropped during welding should be removed in time to prevent hidden dangers from falling into the product.
