Preparation of the new thermostatic soldering iron before use:
Before using a new constant-temperature soldering iron, the soldering iron tip must be plated with a layer of solder before it can be used normally. When the constant-temperature soldering iron is used for a period of time, an oxide layer will be formed on and around the blade surface of the soldering iron tip, causing "tin eating". "If it is a difficult phenomenon, you can file off the oxide layer and re-plat it with solder.
How to hold a constant temperature soldering iron:
a. Reverse grip: hold the handle of the constant-temperature soldering iron in the palm of your hand with your five fingers. This method is suitable for high-power constant temperature electric soldering irons to weld parts that dissipate large amounts of heat.
b. Forward grip method: Hold the constant temperature soldering iron handle with four fingers except the thumb, and press the thumb along the direction of the soldering iron. The soldering iron used in this method is also relatively large, and most of them have curved soldering iron heads.
c. Pen holding method: Hold the constant-temperature soldering iron like a pen. It is suitable for low-power soldering irons and welding small parts to be welded.
Welding steps:
During the welding process, tools should be placed neatly and the constant-temperature soldering iron should be held steadily and aligned. For general contact welding, it is best to use rosin-laced tubular solder wire. Hold the handle of the constant-temperature soldering iron in one hand and the soldering wire in the other.
1. One method is to quickly contact the heated and tinned soldering iron tip with the cored wire, and then contact the solder joint area, using the molten solder to help the initial heat conduction from the soldering iron to the workpiece, and then remove the tin wire. Remove the soldering iron tip from the soldering surface.
2. One method is to touch the soldering iron tip to the pin/pad and place 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, what usually occurs is the use of inappropriate temperature, too much pressure, extended retention time, or a combination of the three, which causes damage to the PCB or components.
Precautions for soldering with constant temperature electric soldering iron:
1. The temperature of the soldering iron tip of the constant-temperature electric soldering iron must be appropriate. Putting the soldering iron tips of different temperatures on the rosin block will produce different phenomena. Generally speaking, the temperature when the rosin melts quickly and does not smoke is more suitable.
2. The welding time of the constant temperature electric soldering iron should be appropriate. From heating the soldering point to the time when the solder melts and flows over the soldering point, it should generally be completed within a few seconds. If the welding time is too long, the flux on the welding point will completely evaporate and the welding 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 can easily cause false welding.
3. Use an appropriate amount of solder and flux. Generally, using too much or too little solder and flux on welding points will have a great impact on the welding quality.
4. Prevent the solder on the welding point from flowing randomly. The ideal welding should be that the solder is only welded where it needs to be welded. In the welding operation, there should be less solder at the beginning. After the welding point reaches the welding temperature and the solder flows into the gap of the welding point, replenish the solder to complete the welding quickly.
5. Do not touch the soldering point during the welding process with the constant temperature electric soldering iron. When the solder on the soldering point has not completely solidified, the soldered components and wires on the soldering point should not be moved, otherwise the soldering point will deform and virtual soldering will occur.
6. When welding, the constant-temperature soldering iron should not burn the surrounding components and wires. When welding, be careful not to let the soldering iron burn the plastic insulation layer of the surrounding wires and the surface of the components, especially for products with compact welding structures and complex shapes. .
7. After welding is completed, clean up after welding in time. After welding is completed, the cut wire ends and tin slag dropped during welding should be removed in time to prevent them from falling into the product and causing hidden dangers.
