Selection and maintenance of iron head

1) shape and use of iron head

The role of the iron head is to store and transfer heat, which is much higher than the temperature of the welded workpiece. The temperature of the iron head is related to its power, its volume shape, length and so on. When welding, it is necessary to consider and use different shapes of soldering iron head in combination with all aspects.

When selecting the grid head, consideration should be given to making the contact area at the tip of the soldering head smaller than that of the welding pad. If the contact surface is too large, excessive heat will be transmitted to the welding site, damaging components and printed circuit boards. Generally speaking, the long and pointed soldering iron head requires a longer welding time; on the contrary, the short and thick soldering iron head needs a shorter welding time.

2) Tin plating on new soldering iron

Before the ordinary electric iron is used, it is necessary to put a layer of tin on the iron head, which is called tin plating. The process of tin plating is as follows: first, the electric soldering iron is electrified. When the soldering iron head can be melted and soldered, the paint on the iron head can be wiped off with wet towel, and then the solder wire is applied to the head of the iron head, so that the tip can be evenly coated with a layer of solder. The heated iron head can also be inserted into the rosin, with rosin to remove the paint on the tip, and then plating solder. The advantage of tin plating on the soldering iron head is to protect the iron head from oxidation and make the soldering iron head easier to weld the components.

3) maintenance of iron head after wear

The iron head is made of copper and is coated with a protective layer (such as zinc, which protects the iron head from being oxidized to rust). Although the galvanizing layer has played a protective role, but after a period of time of use, due to the high temperature and the role of flux, soldering iron will be oxidized "burned", making the surface uneven. That is, the iron head temperature is too high so that the solder on the iron head evaporated, the iron head is burned black oxidation. It is very difficult to weld at this time, so it is necessary to do some pruning.

The shape and thickness of the soldering head should be determined according to the shape of the soldering object and the size of the solder joint, and the oxide layer should be filed with a file. The finished soldering iron head needs to be tinned again before it can be used. So when the electric iron does not use for a long time, should unplug the power source to prevent the electric iron from "burning".

At present, the soldering iron on the market is coated with a copper head with a protective layer. This soldering iron has strong corrosion resistance:

The heating core adopts a new generation of semiconductor PTC ceramic materials, and its appearance and electric heating wire core can be used interchangeably with anti-corrosion bridge head and PTC heating core, and is called "long-life electric soldering iron".

Use zero or more in the static direction high station to assist in electrostatic induction. Not only can you directly change the CMOS chip, but this kind of "long-term need to be quickly used, but you can not use sandpaper or steel boring soldering iron tip, otherwise the surface coating of the iron head will no longer resist corrosion when worn."

This article is from ALLICDATA ELECTRONICS　LIMITED.