Manual welding process of electric soldering iron
1. Pre operation inspection
(1) Insert the electric soldering iron plug into the designated socket 3-5 minutes before work every day to check if the soldering iron is hot. If it is not hot, first check if the socket is plugged in properly. If it is plugged in properly, and if it still does not heat, immediately report to the administrator. Do not disassemble the soldering iron without permission, and do not directly touch the soldering iron head with your hands
(2) The soldering iron head that has been oxidized, uneven or hooked should be updated: 1. It can ensure good heat conduction effect; 2. Ensure the quality of the welded object. If a new soldering iron tip is installed, the maintenance paint should be wiped off after being heated and tin should be added immediately for maintenance. The cleaning of soldering iron should be carried out before soldering operation. If the soldering iron is not used for more than 5 minutes, the power should be turned off. Sponges that are not clean and contain metal particles or sulfur can damage the soldering iron head.
(3) Check if the tin sponge has water and is clean. If there is no water, add an appropriate amount of water (an appropriate amount refers to the amount of water that seeps out when the sponge is pressed to half the normal thickness. The specific operation is: humidity requires the sponge to be completely wet, hold it in the palm of the hand, and the five fingers should naturally close). The sponge should be cleaned thoroughly. Unclean sponges containing metal particles or sulfur-containing sponges can damage the soldering iron head.
(4) Whether the human body is reliably grounded with the soldering iron, and whether the human body is wearing an electrostatic ring.
2. Welding steps of electric soldering iron
The specific operation steps of soldering iron welding can be divided into five steps, called the five step engineering method. To achieve good welding quality, it is necessary to strictly follow the five steps shown in the figure below.
Welding according to the above steps is one of the keys to obtaining good solder joints. In actual production, the most common practice that violates the operating steps is that the soldering iron head does not first come into contact with the soldered part, but first comes into contact with the solder wire. The melted solder drops on the soldered part that has not yet been preheated, which can easily lead to solder joint failure. Therefore, the soldering iron head must come into contact with the soldered part, and preheating the soldered part is an important means to prevent solder failure.
