The purpose, kind, composition, choice, and technique of using an electric soldering iron
1. Function:
Provide the heat source required for welding, heat the metal to be welded, melt the solder, and promote their mutual fusion to form close contact.
2. Type and structure:
(1) External heating soldering iron
① Structure: It consists of soldering iron head, soldering iron core, shell, wooden handle, power cord and lead plug.
②Specifications: 25W, 45W, 75W, 100W, 150W, etc. (the greater the power, the higher the temperature of the soldering iron tip)
(2) Internal heating soldering iron
① Structure: It consists of soldering iron head, soldering iron core, shell, wooden handle, power cord and lead plug.
②Specifications: 20W, 30W, 50W, etc.
③The internal heating soldering iron has high efficiency. A 20W internal heating soldering iron is equivalent to an external heating soldering iron of about 40W.
3.Select
(1) General printed circuit boards, electronic components, and installation wires: 20W internal heating type, 30W external heating type;
(2) Integrated circuit: 20W internal heating type;
(3) Welding pieces, potentiometers, 2~8W resistors, large electrolytic capacitors, high-power tubes: 30~50·W internal heating type, 50~75W external heating type;
(4) Resistor above 8W, wire above 2mm: 100W internal heating type, 150~200W external heating type;
4. Grip
(1) Reverse grip method: suitable for operating high-power electric soldering irons and welding parts to be welded that dissipate large amounts of heat;
(2) Forward grip method: suitable for operating high-power electric soldering irons and most of them are elbow-type electric soldering irons;
(3) Pen holding type: suitable for low-power (below 35W) electric soldering irons, mostly used in electronic production, such as general welding of printed circuit boards.
