How should lead-free solder wire and lead-containing solder wire be selected? JJY Solder Paste Manufacturer

Lead-free solder wireHow should lead-containing solder wire be selected? Nowadays, society is developing at an increasingly rapid pace, and the production of electronic products is becoming more and more widespread. The specifications and various requirements of the products needed are relatively high, and a wide variety of products have emerged. Many people ask, what are the differences between lead-free and lead-containing products? What are the distinctions between them? Many small companies do not know how to purchase one. Regarding these, Here, JJY solder Paste Manufacturer can offer some suggestions:

1

Lead-free solder wire and lead-containing solder wire, literally speaking, are one that does not contain metallic lead.Pb),One containing metallic leadPb" Therefore, the functions and applicable environments of the two types of solder are also different.

Lead-free solder wire also contains a very small amount of lead. At present, there are no completely pure metal products. Solder wire that generally does not contain lead is called lead-free solder wire. Lead-free does not mean completely free of lead; it simply means having a relatively low lead content, which can roughly be regarded as lead-free. The EU countries define lead-free as follows: lead content1000PPm. Considering that there is a high possibility of further environmental pollution after electric welding, to ensure that the finished products of customers meet the EU standards, the lead content of the solder wire is generally much lower than this specification.

Highlights:

1To reduce the evaporation of toxic substances during welding, which is detrimental to human health, and the solder joints welded with lead-containing solder wires are prone to rust and damage.

2To reduce the contact resistance at the soldering point, higher-grade solder also contains a small amount of silver.

3The solder joints are smooth, durable, beautiful, firm and reduce the resistance between components.

The more common proportion is tin.Sn)63%LeadPb)37%This type of solder is also called carbide solder. Adding lead to solder can reduce its melting point. The melting point of pure tin is232℃And the melting point of this type of solder wire is183℃Reducing the melting point not only prevents the board from being damaged by high temperatures but also alleviates the situation where the soldering iron tip is "burned out" under continuous high temperatures (the "burned out" soldering iron tip is black and will no longer be tinned, thus it cannot be used again). In addition, lead can enhance the working capacity of tin, reduce the situation of empty soldering, expand the contact area of the tin solution, and is beneficial to improving the quality of the product's electric soldering.

Comparison of the characteristics of lead-containing solder wire and heavy metal-free solder wire:
　　The glossiness color is also directly related to the quality grade and tin content of the solder wire. The glossiness and color not only directly affect the appearance but also directly influence the welding quality. The luster color is bright and eye-catching. The tin content must be high, and the actual welding effect will not be good. Otherwise, the actual welding effect will not be good, and even a dull or white color will occur, which is not the conventional shiny color.
　　The tin content is the most important part and the only criterion for distinguishing the grade of solder wire. It also affects the main elements of standards such as the actual welding effect, firmness, stability and electrical conductivity. When applying leaded solder wire, we must use solder wire with a tin content that matches the equipment requirements; otherwise, there may be problems of varying levels in the soldering quality. The amount of tin content cannot be identified by the naked eye; it can only be known through examination. There are also many kinds of inspection methods, such as: spectrometer inspection instrument, net weight ratio method, organic chemical titration method, etc. There are generally no such testing instruments in hardware factories, and there are very large engravings left. Our company provides testing services completely free of charge to various electronic component manufacturers.
　　When the flux component in leaded solder wire catches fire during soldering, it will leave residues and at the same time produce thick smoke. The thicker the thick smoke is, the more residues there will be. Residues will affect the appearance of spot welding, which is often necessary Clean up and deal with it. And the thick smoke will endanger the physical health of the actual operation staff. Therefore, in the selection Leaded solder wire is expected to be selected Solder wire with low residual matter and thick smoke concentration values.
　　When manufacturing solder wire, moderately reducing the amount of flux can help decrease the moisture content inside. However, the prerequisite for this is that after reducing the amount of flux, there can still be effective weldability, firmness and other welding effects. This is because the quality of the solder wire is ultimately reflected in the welding effect. The lower the moisture content in the rosin raw materials purchased home, the better. It is best that each batch of rosin raw materials has no moisture content. The storage of rosin and the prevention of moisture intrusion during the production process of flux should be avoided as much as possible,I believe everyone has already made a judgment on how to choose between lead-free solder and lead-containing solder wire. In summary, if the sheet cannot withstand high temperatures, then we can choose lead-containing solder wire. If our products need to meet EU standards or require higher performance, then we can choose lead-free solder wire.

Shenzhen JJY Industrial Technology Co., Ltd. mainly operates:LEDType solder paste, lead-containing solder paste, lead-containing silver solder paste, stainless steel plate type solder pasteSMTSolder paste, lead-free flux paste, no-clean solder wireLead-free solder wireManufacturers of solder paste and solder wire, including leaded solder wire, lead-free and leaded solder rods, wave solder rods, and automatic solder wires.