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The understanding and purchase of tin wire

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Update time : 2022-09-20 10:56:55
Tin wire is the most common welding material used in the welding of electronic and electrical products. Tin wire is mainly an industrial soldering solder used for connecting electronic devices to circuit boards.
Improper operation will cause the wire to be discarded, and the discarded tin wire can be reused by recycling to improve the utilization rate of the tin wire.
Tin wire is divided into lead tin wire and lead-free tin wire. The components of lead tin wire are lead and tin. In order to meet the requirements of environmental protection, many factories now use lead-free tin wire, but the difficulty of pure tin welding increases, the fluidity is not strong, the diffusion performance is poor, the melting point of lead-free tin wire is high, the working temperature of welding is high, and the effect of welding is relatively higher than that of lead solder. The line is a little worse, and you have to buy it according to your own factory product needs.
A 63/37 alloy ratio of lead-tin wire is the best. When 63% tin and 37% lead are fused, the hardness, viscosity and welding effect of the tin wire are good, but for price competition, many varieties are divided, such as 63 tin/37 lead, 60 tin/ 40 lead, 55 tin/45 lead, 50 tin/50 lead, 45 tin/55 lead, 40 tin/60 lead, 35 tin/65 lead, etc., because the price of tin is about 6 times that of lead, and the solder wire is welded The solder joints are bee-shaped under the microscope. As the degree of tin content decreases, the holes will become larger and larger, and the firmness of the solder joints will gradually decrease. Increase, the brightness saturation of solder joints also decreases.
The melting point of lead-tin wire and lead-tin wire is different
At present, the most used environmentally friendly tin wires are tin copper alloy tin wires, respectively Sn99.3%Cu0.7 melting point temperature of 227 degrees
Tin-silver tin wire: Tin-silver tin wire is divided into different alloy ratios and the added silver content is different, so the melting point is slightly different
The most commonly used are the following:
Sn-Cu alloy melting point temperature 227 degrees Sn63/Pb37 alloy melting point temperature 183
Sn-Ag alloy melting point temperature 221 degrees Sn60/Pb40 alloy melting point temperature 190 degrees
Sn-Ag-Cu alloy melting point temperature 217 degrees -219 degrees Sn55/Pb45 alloy melting point temperature 203
Sn-3.0Ag-0.7Cu alloy melting point temperature 217 degrees -219 degrees Sn50/Pb45 alloy melting point temperature 216
Sn-3.0Ag-0.5Cu alloy melting point temperature 217 degrees -219 degrees Sn45/Pb55 alloy melting point temperature 227
Next, how do we reasonably choose the tin wire?
Solder wire plays a very and significant role in industrial production, especially in the field of electronic production. Therefore, the application in production and the requirements for environmental protection in various countries have different levels of regulations, so what details should be paid attention to in the purchase process ?
1. Manufacturer
First of all, it is the most basic and critical step to see the manufacturer of the solder wire. If you want to go to the regular large-scale supply market to buy these products, and then choose after-sales, you need to pay attention to the manufacturers of these tin wires. Otherwise, you don't need to know some information about the manufacturers, including addresses, contact information, etc.
2. Qualification certificate
In addition, it is necessary to pay attention to check some relevant qualification certification materials or certificates of the product, and fully understand the quality of the factory. Don't be afraid of trouble, doing a good job in this series of work is an important part of ensuring the purchase of high-quality tin wire, and it is also a safety guarantee for quality.
3. Packaging appearance
In addition, for good tin materials, you can carefully observe the outer packaging of tin wire products. Although the outer packaging is not directly related to the quality of the product, we can see some relevant information about the product from the outer packaging.
Generally, regular manufacturers will choose standardized product packaging, and specific information signs will be printed on the product packaging. If not, it is not recommended to buy!
4. Selection of tin content in products
Finally, I would like to remind everyone that you should not blindly pursue cheapness. It is best to use an electronic scale to measure the weight. If possible, you can use a testing instrument to detect its tin content, so as to avoid the shortage caused by insufficient tin content. 
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