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The difference between lead or lead-free solder wire

1. What is solder wire?

The difference between lead or lead-free solder wire

The picture above shows the use of solder wire in welding work

Solder wire is a low melting point wire that can be melted with a soldering iron. There are different types of solder wire to choose from depending on the application and soldering temperature. There are generally two types of solder wire - lead alloy solder wire and lead-free solder.

2.Solder wire classification:

Solder wire is mainly divided into two categories: lead solder wire and lead-free solder wire

3. The difference between lead solder wire and lead-free solder wire


A. The difference between lead-containing and lead-free solder wire is only the difference in content.


B. The lead in solder wire is artificially added in the industrial manufacturing of solder wire. The optimal ratio is: tin content 63: lead content 37.


C. But lead-free solder wire also contains a small amount of lead, but it does not contain as much lead and tin wire. At present, there is no completely pure tin metal product, because of the composition of its synthesis, but less lead can be considered as lead-free.


D. Both lead and lead-free solder wires will oxidize and corrode the soldering iron tip, because the lead-free soldering temperature is higher than the lead soldering temperature. Because of its different composition, lead-free solder wire is more likely to corrode the soldering iron tip than lead solder wire.

The difference between lead or lead-free solder wire

4. Performance comparison of lead solder wire and lead-free solder wire:

A. The luster color of the solder wire is directly related to its quality grade and the amount of solder. Its glossy color is the main reason that affects the appearance and soldering quality. The brighter the glossy color, the higher the tin content and the better the soldering effect and vice versa.

B. The amount of tin is the standard for judging the quality of the solder wire. The brighter the solder wire, the better the quality, and the better the quality of the soldered product.


Besides, it is also an important factor related to the standards of soldering effect, firmness, conductivity and reliability. When using solder wire, we must use it according to the requirements of the soldering product, otherwise the welded product will have different problems. It is difficult for us to distinguish the content of the solder wire with our eyes, but it can be detected. There are many methods to detect the content of solder wire, such as gravimetric method, chemical method, spectrum detector, etc.

C. When using lead solder wire during soldering, the flux contained in it will leave impurities and a lot of smoke when it burns. The thicker the smoke, the more impurities contained in the solder wire. This impurity will affect the appearance of your soldering, and the fumes will affect the physical and mental health of the operator. Therefore, when choosing a solder wire, it is hoped that a solder wire with a smaller concentration of impurities and smoke can be selected.


D. When producing solder wire, reduce the content of flux as much as possible to reduce the moisture content, but the premise of this approach is to reduce the content of flux, and to ensure the effect, firmness and reliability of soldering. Because the quality of the solder wire is still reflected in the soldering results.


E. The appearance of the solder wire may be difficult to explain what the problem is, but the product packaging produced by a regular and powerful brand manufacturer has a description of the solder wire, otherwise how can customers distinguish and use it? In addition, the weight of each roll of solder wire is also marked to indicate that the weight is different. In fact, the price is also different.

5. Lead solder wire and lead-free solder wire, which one is better?

The melting point of lead tin wire is lower, which is more conducive to soldering; lead-free tin wire is more environmentally friendly; because everyone is responsible for protecting the environment, in order to protect the environment, lead-free soldering wire must be used.


Advantages of Lead-Free Soldering Wire

A. Good thermal conductivity, wettability and electrical conductivity

B. Soldering without splashing, moderate flux

C. Flux distribution is uniform

D. No knots, easy to operate and high efficiency. 

Therefore, when we choose solder wire, trying to choose the lead-free one. And a local suction device should be installed in the manual soldering station to reduce the harm to the human body caused by the "smoke" generated during the use of lead solder wire.

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