Is the solder wire leaded or lead-free?

Solder wire, Chinese name: solder wire, solder wire, tin wire, tin wire, English name: solderwire, solder wire is composed of tin alloy and additives. The alloy components are divided into tin-lead and lead-free additives. The middle part of tin alloy.

 

　　 Different types of solder wire additives are different. The additives are to improve the auxiliary heat transfer of the solder wire during the soldering process, remove oxidation, reduce the surface tension of the soldered material, remove the surface oil of the soldered material, and increase the welding area. The characteristic of solder wire is a tin alloy wire with a certain length and diameter, which can be used in conjunction with an electric soldering iron or laser in the welding of electronic original devices.

 

 

　　

 

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

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

 

　　2. Lead-containing solder wire needs to be artificially added with lead. The best known soldering ratio is tin-lead solder wire (national standard: tin content 63%, lead content 37%).

 

　　 3. Lead-free solder wire also contains very little lead, and there is currently no pure metal product. Usually lead-free solder wire is called lead-free solder wire. Lead-free does not mean that there is no lead at all. Lead-free means that the lead content is relatively low, which can be roughly regarded as lead-free. The EU defines lead-free standard as: lead content " 1000PPm. Considering the possibility of further contamination during welding and subsequent work, in order to ensure that the customer's finished product meets the EU standards, the lead content of the general solder wire will be much lower than this standard.

 

4. Both lead-containing and lead-free solder wires will corrode the tip of the soldering iron, because the lead-free soldering temperature is higher than that of leaded solder wire, and the alloy composition is different, lead-free solder wire is more likely to corrode the soldering iron, due to lead-free requirements It is recommended to use lead-free special electric soldering iron when soldering lead-free tin wire.

 

　　

 

　　 Performance comparison between lead solder wire and lead-free solder wire

　　The gloss color is also directly related to the quality level of the solder wire and the amount of tin. The gloss color not only affects the appearance but also the welding quality. The shiny and dazzling tin content must be high, and the welding effect will be good, otherwise the welding effect will be bad, and even a dull or whitish color will appear, which is not a normal shiny color.

 

　　The tin content is the most important part and the only criterion for judging the solder wire grade. It is also related to important factors such as welding effect, firmness, reliability, conductivity and other indicators. When we use leaded solder wire, we must use solder wire with tin content that meets the requirements of the product, otherwise the soldering quality will have varying degrees of problems. The amount of tin is indistinguishable from the eyes, and can only be known through testing. There are also many kinds of detection methods, such as: spectrometer, gravimetric method, chemical titration and so on. There is usually no such testing equipment in the electronics factory, leaving a large gap. Our company provides free testing services for electronic manufacturers.

 

　　The flux component in the leaded solder wire burns during soldering, leaving residues and fumes at the same time. When the smoke is thicker, there may be more residues. Residues will affect the appearance of the solder joints and often need to be cleaned to solve them. The smoke will affect the physical and mental health of the operators. Therefore, when choosing leaded solder wire, we hope to choose solder wire with low residue and smoke concentration.

 

When the solder wire is produced, the content of the flux is appropriately reduced, so that the moisture inside is reduced, but the premise of this approach is that after the flux is reduced, the solderability, firmness, etc. can still be good. The effect is the premise, because the quality of the solder wire is ultimately reflected in the welding effect. The lower the moisture content in the purchased rosin raw materials, the better, and it is best that each batch of rosin raw materials has no moisture content. The storage of rosin and the minimum intrusion of moisture in the flux production and synthesis process.

 

　　 Although the appearance of the solder wire can't explain exactly what the problem is, it should be mentioned. The products produced by a regular, powerful, and branded manufacturer must have relevant appearance packaging standards, and there are detailed labeling instructions for this solder wire. Otherwise, how can customers distinguish and use it? Another thing worth mentioning is the weight of each roll, and the price is different for different weights. Nowadays, solder wires have a variety of packaging weights.