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Precautions for safe use of electric soldering iron

2018/5/22 7:36:17 Viewers:

Electric soldering iron is a necessary tool for electronic production and electrical maintenance. The main use is welding components and wires. According to the mechanical structure, it can be divided into internal heat soldering iron and external heat soldering iron. According to the function, it can be divided into welding electric soldering iron and tin absorbing electric soldering iron. According to different purpose, it can be divided into high power soldering iron and small power soldering iron. Next, let's learn about safety precautions of electric iron.

Precautions for safe use of electric soldering iron

1. before using the electric iron, the resistance value between the plugs should be checked with multimeter, and should be in the range of 2 to 3K ohm. Then use multimeter to check the resistance between the plug and the metal housing. The meter needle should not be moved, otherwise it should be thoroughly checked.

2. soldering iron head

It is usually made of copper material. In order to protect the soldering iron from oxidation and rust under high temperature conditions, galvanized iron heads are often treated by electroplating, and some iron heads are made of alloy materials which are not easy to oxidize.  New soldering iron head should be tinned before formal welding. The method is to grind out the iron head with fine sand paper, and then soak the perfume and soak the soldering tin on the hard objects (such as wood plate) repeatedly, so that all the sides of the iron head are tin plated. If the time is very long and the iron head has been oxidized, a small file should be used to file the oxide layer on the surface. After the light of the copper is exposed, it is treated with the same method of tin plating with the new iron head.

3. when the electric soldering iron is used, if the temperature is too low, the solder can not be melted, or the solder joints are not completely melted but not good or hard to weld, and the temperature is too high to "burn" the iron. In addition, it is necessary to control the time of welding. The time of electric soldering iron stays too short. The solder is not easy to melt and contact. It is easy to form "false welding", and the welding time is too long, and it is easy to damage the components or make the copper foil of printed circuit board up. Generally, a solder joint should be welded in 1 ~ 2S. If not completed, it should be welded again after a while. When soldering iron can not be moved, the position of the contact spot should be selected first, then the tin surface of the iron head should be used to contact the solder joint.

4. electric plug can preferably use three wire plug to make the enclosure properly grounded. Before use, carefully check whether the power plug and power cord are damaged, and whether the soldering head is loose.

5. electric soldering iron is strictly prohibited from percussion during the use process. When the soldering tin is too much, the cloth can be rubbed off.

6. during welding, the electric iron must not be placed everywhere, and should not be placed on the iron frame when welding.

7. the power cord must not be attached to the soldering iron head, so as to prevent the insulation from being damaged.

8. after use, the power supply should be cut off in time and the electric iron will be recovered after cooling.

9. after welding is finished, alcohol should be used to clean the residual flux on the PCB, so as to prevent carbonization of the flux from affecting the normal operation of the circuit.