Introduction to the features of soldering irons in pen form and in point form
1. Pen-shaped soldering iron
This kind of electric soldering iron is generally pointed, and there are two types: adjustable temperature and non-adjustable temperature.
Its characteristics are: cheap price, suitable for soldering plug-in components, non-adjustable pen-shaped electric soldering iron, oxidized with long-term high temperature, and the tip of the tip is no longer tinned.
For the type of LQFP package and TSSOP package, the pointed soldering iron is generally not easy to use, and it cannot be replaced with a knife-edge soldering iron tip, which has great limitations.
It is only the welding of plug-in components. When performing some simple welding needs, you can use a harmful electric soldering iron.
2. Pointed soldering iron
Soldering stations are generally temperature-adjustable, and some are equipped with heat guns. The original one is pointed, but due to structural compatibility, it can be replaced with a knife-edged tip.
When using a pointed soldering iron, the temperature can be adjusted to about 350 for the soldering of general electronic components. When there is a fan heat design on the PCBA, the temperature can be increased appropriately to ensure that the temperature can melt the tin on the PCBA.
Because the knife edge of the soldering iron tip can be effectively bonded to the pins of the SOP/TSSOP/LQFP package, it will be easier to handle during desoldering.
How to choose a soldering iron?
(1) When soldering integrated circuits, transistors and components that are vulnerable to heat, consider using a 20W internal heating or 25W external heating electric soldering iron.
(2) When welding thicker wires or coaxial cables, consider using a 50W internal heating type or a 45-75W external heating type electric soldering iron.
(3) When soldering larger components, such as metal chassis grounding pads, an electric soldering iron above 100W should be used.
(4) The shape of the soldering iron tip should adapt to the surface requirements of the weldment and the assembly density of the product.
To put it simply, the power and type of the soldering iron should be reasonably selected according to the welding object. If the weldment is larger, the power of the soldering iron used should be higher. If the power is small, the soldering temperature will be too low and the solder will melt slowly. The flux is not easy to volatilize, and the solder joints are not smooth and firm, which will inevitably lead to unqualified appearance quality and welding strength, and even the solder cannot be melted, and the welding cannot be carried out. However, the power of the electric soldering iron should not be too large. If it is too large, too much heat will be transferred to the workpiece to be welded, and the solder joints of the components will be overheated, which may cause damage to the components, and the copper foil of the printed circuit board will fall off and the solder will be damaged. The flow on the welding surface is too fast and cannot be controlled, etc.
