We all know that soldering stations are divided into lead-free soldering stations and lead 

soldering stations, but many people might not know why they are divided by this. What is the 

reason? The most obvious difference between lead-free soldering stations and leaded soldering 

stations is four aspects:

1. soldering temperature difference:

    The most difference is the soldering temperature. The soldering temperature  for lead-free 

tin wire required is higher, generally around 250 degrees, while the soldering temperature of 

ordinary tin wire is 180 degrees, so the soldering temperature of lead-free soldering station 

is higher.and lead-free soldering stations provide faster heating.

2. Differences in environmental protection levels:

    Leaded soldering is economical and has been widely used before. However, lead is a metal 

that is harmful to human health, which has led to the topic of lead-free soldering. Lead-free 

soldering stations can be made into lead-free environmentally friendly products without being 

contaminated, so that there is no need to worry about harm to the environment and the human 

body. Lead  solder is not environmentally friendly and be forbidden to exporting.

3.The difference in price:
the lead soldering is economical, the lead-free soldering is 

relatively expensive, and the use is not popular;

4. Differences in raw materials:
The biggest difference between lead and lead-free solder paste 

is whether it contains lead. The change in composition causes the melting point of physical 

properties to change and the wettability to change. The flux is added to the lead solder paste, 

which is called lead flux. When it is added to the lead-free solder paste, it is called lead-

free flux. It is not named by that the flux if contains lead.

5, the difference in use:

    The biggest difference between lead-free flux and leaded flux is that the composition is 

mostly the same, with a small amount of ingredients changed. In theory, lead-free solder joints 

can also be soldered with lead-free soldering stations because the temperature of lead-free 

soldering stations can reach the melting point of leaded solder. However, no one actually uses 

this, because once the lead solder is soldered on the lead-free soldering station, the lead-

free soldering station is contaminated and can no longer be lead-free environmentally friendly 

products.

    Lead-free soldering stations are used in a wide range of applications, from common 

electronic appliance repairs to electronic integrated circuits and chips. Lead-free soldering 

stations are used as soldering tools and are commonly used for soldering of PCB boards in 

electronics factories. Especially suitable for the soldering operation of lead-free precision 

electronics.

    With the gradual improvement of international environmental protection requirements, lead-

free technology has become an inevitable process for the development of the electronics 

industry. Although lead-free processes have been implemented for so many years, some companies 

still use lead-based processes, but the lead-free process completely to replaces lead, which is 

an inevitable result.

    But lead-free processes may not be as good as lead in some areas of use, so what we will 

study later is how to make lead-free processes a better alternative to lead-based processes. 

Let Rohs environmental protection spread more widely, and achieve a win-win goal of both profit 

and environmental protection. At present, many large domestic companies do not fully adopt 

lead-free processes but adopt lead-based process technologies to improve reliability.

    We say that lead-free is not absolutely lead-free. People often say that gold is not full 

gold. The current standard is that lead can be called lead-free as long as the lead content 

does not exceed 1000 ppm.

    Secondly, what you need to know is that no lead soldering station or lead-free soldering 

station is lead-free. Why is there lead and lead-free? The reason is that the solder used in 

the soldering station is lead-free. Before the soldering station came out, the traditional 

soldering station used lead-tin alloy as the solder. The lead-tin alloy has a long history as a 

solder. It has its own advantages as a solder. First, the lead-tin alloy has good strength 

after soldering. And anti-fatigue characteristics, then the melting point of lead-tin alloy is 

generally low, there is better fluidity after melting, and finally, lead reserves are abundant, 

and the price is cheap.

That being the case, lead-tin alloys have so many advantages, so why do you want to make lead-

free soldering stations? We all know that lead is toxic. The US Environmental Protection Agency 

(EPA) identifies lead and its compounds as one of the 17 serious hazards chemical substances in 

human life and the natural environment, lead enters the food chain of animals or humans by 

infiltrating into the groundwater system; in daily work, the human body can absorb lead or its 

compounds through skin absorption, respiration, feeding, etc., when these substances are in 

When a certain amount is reached in the human body, it will affect the normal synthesis of 

proteins in the body, destroy the central nervous system, cause nervous and reproductive system 

disorders, sluggishness, anemia, mental decline, hypertension and even infertility; lead 

poisoning is a heavy metal poisoning, in the human body It also has problems that cannot be 

excreted and will gradually accumulate. Because of this, lead-free is more and more valued by 

humans, and lead-free solder is born, and lead-free soldering stations is one of the lead-free 

soldering tools. 

    So various lead-free solders have been developed, but they all have a characteristic that 

the melting point is relatively high, the common lead-tin composition is 63/37, the melting 

point is 180°-185°, and the lead-free tin is 225°-235. °, the increase of the melting point 

puts higher requirements on the soldering station. First, soldering the same size of solder 

joints requires more heat. Secondly, in order to ensure the soldering quality and productivity, 

soldering the same size solder joints, soldering time Can not be extended. Third, the soldering 

temperature cannot be increased too much, because the electronic components and the PCB are 

sensitive to high temperatures, and the increased temperature may burn out the product. 

Therefore, compared with the conventional soldering station, the power of the lead-free 

soldering station is greater, and the handle is thermally conductive. Part of the thermal 

conductivity is more efficient, so that more heat is supplied at the same temperature. Then, 

the temperature sensor of the lead-free soldering station is more precise and close to the 

working part of the soldering iron to detect and control the temperature change.

Lead-free soldering stations are used in a wide range of applications, from common electronic 

appliance repairs to electronic integrated circuits and chips. Lead-free soldering stations are 

used as soldering tools and are commonly used for soldering of PCB boards in electronics 

factories. Especially suitable for the soldering operation of lead-free precision electronics.

There are many functions of the soldering station, which is also to meet the production 

requirements of the precision electronic processing industry. Generally, the following aspects are required:

1: The temperature lock function of the soldering station cannot be greatly deviated.

2: The password lock function prevents workers from accidentally changing the soldering 

temperature at will.

3: Anti-static function, precision chip soldering process requires strict anti-static 

requirements.

4: Automatic sleep function, in order to extend the life of the tip.

5: Temperature compensation function, heating and temperature recovery speed should be fast.

6: Digital display temperature, easy to adjust.

    In fact,the main reason is the difference in soldering temperature. The soldering 

temperature required for lead-free tin wire is higher, generally around 250 degrees, while the 

soldering temperature of ordinary tin wire is 180 degrees, so the soldering temperature of 

lead-free soldering station is higher. And the lead-free soldering station heats up faster. 

There are of course exceptions. In lead-free solders, there are also low-temperature solders 

that have a lower melting point than lead-based solders. But the price of this low temperature 

solder is quite expensive.

    In fact, the current constant temperature soldering station has reached the requirements of 

lead-free soldering. The soldering temperature of the common soldering station can reach 450 

degrees. For example, the cxg942 ESD intelligent lead-free soldering station can reach a 

maximum temperature of 450 degrees. can completely match with Lead-free soldering requirements.