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Lead-free tin wire selection considerations
Lead-free tin wire is an indispensable raw material for the electronics industry, so how to buy inexpensive lead-free tin wire is a problem for the electronics industry. The following small series will explain how to choose lead-free disposable solder wire. Because lead-free tin wire is expensive, you must pay attention to the selection and resolution when purchasing. Otherwise, the quality and price of lead-free disposable solder wire purchased back. Inconsistent, and the performance can not play the original design indicators, and ultimately affect the quality of electronic products. So what should you pay attention to when buying lead-free tin wire? How should we tell?
First choose a regular manufacturer to buy. This is very important and has been repeated many times in previous articles. No more detailed answers here. Lead-free tin wire is also composed of many alloy components, and different components have different price points and are also used for different purposes. First select the right and most cost-effective lead-free tin wire based on your electronic product's costing, customer requirements and process design levels. For example: lead-free disposable solder wire Sn99Ag0.3Cu0.7 containing 0.3 silver, Sn96.5Ag3.0Cu0.5 containing 3.0 silver or Sn96.5Ag3.5 containing 3.5 silver, and the like. These alloys are common alloys for lead-free tin wire, and their price, performance and use are different. The more the amount of silver, the more expensive the price, and the better the properties such as firmness and conductivity. As the saying goes: "Good steel is used on the blade."
For lead-free tin wire, samples, especially finished products, should be tested periodically and in batches. The testing items are mainly: silver content and lead content. This silver content relates to the performance and cost price of the solder wire. This lead content is related to the EU ROHS standard, and if the lead content is too high, it will lead to the risk of exceeding the standard of the final electronic product. The authoritative testing agency is to send samples to third parties for testing. Or use a spectrometer to detect. For the purchased tin wire, the welding performance is tested after the welding operation.