电路板焊接知识（Knowledge of circuit board welding）.docVIP

电路板焊接知识（Knowledge of circuit board welding） Knowledge of circuit board welding First, the concept of welding The tin lead solder is called tin lead solder, referred to as soldering, its mechanism is: in the process of welding solder, solder and copper foil in the welding heat effect, welding and the copper foil does not melt solder melting and wetting welding, welding, copper foil asked both rely on atomic molecular movement thus, caused by the diffusion between the metal forming metal alloy layer between the copper foil and copper foil and welding, and welding pieces are connected together by welding point solid. Two. Welding tools 1. Electric iron Electric soldering iron is the most important welding tool. There are many kinds of electric irons, such as direct heating type, induction type, energy storage type and temperature controlled type. The electric power is 15W, 2OW and 35W...... 300W a variety of, mainly based on the size of the weldment to decide. Small power electric soldering iron head temperature is generally between 300~400 degrees centigrade. 2OW internal heating type electric soldering iron for welding general components. The new iron before use, application of spinning paper will tip a light, electricity hot dipped in rosin with tip edge contact solder wire, soldering iron head evenly coated with a layer of tin, which can facilitate welding and prevent surface oxidation of iron head. If used for a long time, the iron head has black oxide, to surface oxide layer with a small file file in the light, the light exposed copper after using the same method as tin iron head for processing, in order to use. Electric iron to use 220V AC power, use should pay special attention to safety. The following points should be made: The electric iron plug is best to use a three stage plug. If the casing is properly grounded. Before use, check the power plug and the power cord carefully for damage. And check if the iron head is loose. The electric iron is not to be stru