What is the five-step method of electric soldering iron welding
1. Prepare.
Prepare the workpiece to be welded, heat the soldering iron to the working temperature, keep the tip of the soldering iron clean and eat the tin, hold the soldering iron in one hand, and hold the solder wire in the other hand, and the soldering iron and solder wire are separated on both sides of the workpiece to be welded.
2. Heating.
When the tip of the soldering iron touches the workpiece to be welded, the entire weldment including the workpiece terminal and pad should be heated evenly. Do not apply pressure or drag the soldering iron at will. The time is about 1 to 2 seconds.
3. Add solder wire.
When the temperature of the workpiece to be welded reaches the welding temperature, the solder wire is sent to contact with the solder joint of the workpiece to melt and wet the solder joint. The solder should touch the weldment from the opposite side of the soldering iron.
The amount of tin to be sent should be appropriate. Generally, it is better to have a uniform and thin layer of solder that can fully wet the entire solder joint. Qualified solder joints should be conical in shape, without tailing, slightly concave on the surface, and have a metallic luster, and the outline of the lead can be vaguely distinguished from the solder joints.
If the solder is piled up too much, some kind of hidden defect may be hidden inside, and the strength of the solder joint is not necessarily high; but if the solder is filled too little, the entire solder joint cannot be completely wetted.
4. Remove the solder wire.
After melting an appropriate amount of solder (at this time, the weldment has fully absorbed the solder and formed a thin layer of solder), quickly remove the solder wire.
5. Remove the soldering iron.
After removing the solder wire, remove the soldering iron quickly before the flux (contained in the tin wire) has evaporated, otherwise bad solder joints will be left. The evacuation direction of the soldering iron is related to the amount of solder remaining, and is generally evacuated in a direction 45° from the axial direction.
When evacuating the soldering iron, it should be recovered, and the recovery action should be quick and skillful, so as not to form a sharp point; when the soldering iron is used, it should be rotated gently, so that the excess solder can be absorbed. From the discharge of the soldering iron to the weldment to the removal of the electric soldering iron, the whole process should take 2 to 3 seconds.
