Prepare welding wire and soldering iron. At this time, it is particularly emphasized that welding head should be kept clean, that is, it can be dipped in solder (commonly known as eating tin).

(2) heating the weldment

Touch the soldering iron to the soldering point. First, pay attention to keep the soldering iron heating all parts of the weldment, such as leads and pads on the printed board, and then pay attention to make the flat part (larger part) of the welding head contact the weldment with large heat capacity, and the side or edge part of the welding head contact the weldment with small heat capacity to keep the weldment heated evenly.

(3) melting the solder

When the weldment is heated to a temperature that can melt the solder, the welding wire is placed at the solder joint, and the solder begins to melt and wet the solder joint.

(4) removing the solder.

When a certain amount of solder melts, the welding wire is removed.

(5) Remove the soldering iron

When solder completely wets the solder joint, remove the soldering iron. Please note that the direction of removing the soldering iron should be about 45 degrees.

The above process takes about two or three seconds for general solder joints. For solder joints with small heat capacity, such as small pads on printed circuit boards, the operation method is sometimes summarized by three-step method, that is, the above steps 2 and 3 are combined into one step, and steps 4 and 5 are combined into one step. In fact, the subtle difference is still five steps, so the five-step method is universal and is the basic method to master manual soldering iron welding. In particular, the stop time between each step is very important to ensure the welding quality, which can only be mastered step by step through practice.

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