How to buy a soldering iron (component lead-free soldering station)

Now it's all lead-free soldering. The factory's purchase of soldering iron (soldering station) can't be purchased with traditional concepts. The common temperature-controlled soldering iron on the market, although the mark can be set to 400 degrees or higher, in fact, its heat capacity and temperature recovery ability, in the case of cold solder joints, is insufficient to deal with lead-free high-temperature soldering. In the welding, the lead-free tin wire with a melting point higher than 34 °C is relatively large, and if it is welded by ordinary temperature-controlled soldering station without increasing the temperature (especially when the solder joint is large), Because of the lack of heat energy, tin burrs, soldering and welding speed are too slow; therefore, in order to achieve a proper welding effect, it is necessary to increase the soldering temperature of the soldering iron, but increasing the soldering setting temperature will bring many negative effects. ,

A. Lead-free tin wire is more oxidized than leaded wire, and high temperature plays a catalytic role. The oxidation rate increases exponentially with the increase of temperature, so welding at very high temperature is easy to cause mechanical contact type soldering. (The solder does not form an intermetallic molten alloy layer between the workpieces to be welded) and the solder joints are grayish;

B. The ideal state of the soldering iron is not to idle higher temperature, eliminate the storage of energy, and directly add the energy obtained from the power supply to the welding place, so as to avoid the loss of energy and achieve good welding to the utmost, but Ordinary soldering irons cannot be realized because of the slow heating rate. Only by increasing the idle temperature, enough heat can be stored to reach the temperature required for the welding load, and the higher temperature will have a great thermal shock to the delicate components. To directly or indirectly affect the performance of the circuit and the performance of the whole machine.

C. General electronics factories, especially optoelectronic products factories, have strict control over the setting of welding temperature. The lower the temperature setting, the better the welding conditions can be met. Therefore, the higher welding temperature can not meet the welding process established by the factory. Claim.

To purchase a lead-free soldering station (ironing iron), you must first ensure two points:

1. Ensure welding temperature is around 350 °C

2. Guarantee welding speed 3-4 seconds a solder joint

The ability to guarantee the above two points is called a lead-free soldering station. It is not advisable to increase the soldering temperature in order to meet the soldering speed, which will affect the solder joint quality and shorten the life of the soldering iron.

Lead-free soldering stations (ironing irons) generally have several powers of 80W, 100W, 120W, and 150W. A lead-free soldering station (ironing iron) that solders most solder joints of 80W can be used. If the solder joint is too large, a lead-free soldering station (ironing iron) with a higher power can be selected.

In short, the purchase of lead-free soldering station (ironing iron) to ensure the above two points, in the case of not meeting the above two points of the lead-free soldering station (iron) can not be called a true lead-free soldering station (iron).