Quality appraisal of solder wire:回收锡丝，solder wire is an indispensable material in daily life. For example, welding precision instruments, meters, etc., all require it. Nowadays, many solder suppliers pass off inferior products as good ones, selling solder wire with only 35 degrees melting point as if it were over 40 degrees. How to identify good quality solder wire has become the most troubling issue for people outside the industry. Below, based on our company's experience, we will introduce how you can identify high-quality solder wire.
1. Pay attention to the manufacturer and don't buy randomly. There must be proper labeling and production permits. Don't go for cheap deals. In short, gather more experience.
2. Observe: People who are not very professional at distinguishing the quality and color of solder can only judge by looking at the solder joints. It's hard to differentiate between 35-degree and 40-degree solder. For 40-degree solder, only a small part at the top of the joint turns white, while the bright area around it accounts for 70%-80% of the entire solder joint. For 35-degree solder, the white area at the top occupies 60%-65% of the entire joint, while the shiny area around it accounts for 35%-40%. For 30-degree solder, the white area at the top takes up 80% of the joint, with only the edges at the bottom being slightly shiny. For 45-degree solder, the joint is almost entirely bright, with only 5%-10% of the top being white.
3. It's best to try using it. Take the solder wire and test it on a circuit, checking whether the solder joint after welding is clean and shiny. Solder with a higher lead content will have a higher melting point, and the resulting solder joint will appear whiter. You can judge accordingly.
[Note: The website link provided in the original text (http://www.xihuishou.com) is omitted in the translation as it is not relevant to the content explanation.]
China Material Recycling Network