What are the reasons that cause soldering irons to produce tin beads during use?
When PCBA is welded with a soldering iron, tin beads will sometimes occur. If there are too many tin beads or if you encounter a customer with strict requirements, it is easy to be judged as a defective product. In order to improve the quality of PCBA welding, it is necessary to understand the cause of solder beads and then make improvements.
The main reasons why soldering iron produces tin beads are as follows:
1. The temperature of the electric soldering iron is too high, and the tin wire heats up too quickly, causing the flux solvent in the tin wire component to boil, causing the tin to explode and produce tin beads.
2. If the quality of the tin wire is not good, the tin wire will cause tin beads to splash. Well-known brands and good quality tin wire will generally have less splashing. It is also very important to choose good tin wire.
3. If the tin wire or welding end gets damp, it is easy to produce tin beads. You need to pay attention to the temperature and humidity of the workshop and carry out reasonable storage.
The technical level of the electric soldering iron operator is low, and if the operator does not operate according to the requirements, the occurrence of tin beads will also occur. Only by improving the technical level of employees can the occurrence of tin beads in PCBA welding be reduced.
Introduction to the characteristics of pencil soldering iron and pointed soldering iron
1. Pen-shaped soldering iron
This type of soldering iron generally has a pointed tip and comes in two types: adjustable temperature and non-adjustable temperature.
Its characteristics are: cheap, suitable for welding plug-in components, non-temperature-adjustable pencil-shaped electric soldering iron, which will oxidize with long-term high temperature, and the pointed tip will no longer be tinned.
For LQFP and TSSOP packages, pointed soldering irons are generally difficult to use and cannot be replaced with knife-edge soldering iron tips, which has great limitations.
It is just for welding plug-in components. When performing some simple welding requirements, you can use a harmful electric soldering iron.
2. Pointed soldering iron
Welding stations are generally temperature-adjustable, and some are equipped with heat guns. The original one has a sharp tip, but due to structural compatibility, it can be replaced with a blade tip.
When using a pointed soldering iron, for general electronic component soldering, the temperature can be adjusted to about 350. When the PCBA is designed with fan heating, the temperature can be appropriately raised to ensure that the temperature can melt the tin on the PCBA.
Because the blade edge of the soldering iron tip can effectively fit the pins of the SOP/TSSOP/LQFP package, it will be easier to handle when removing tin.
