The quality of solder wire directly impacts the quality of welding! Next, let's share several methods for assessing solder wire quality.

Firstly, observe; a good solder wire should be smooth, shiny, with no oxidation or blackening!

The quality of solder wire is generally indicated by its finer, shiny appearance; thicker solder wire tends to have a higher lead content and is relatively harder to melt. These are basic judgments that can be made through direct observation alone.

Then comes the feel; good soldering wire is bright and white, and it's not easy to transfer to the hand when wiped, whereas leaded solder wire is dark and will easily soil your hands! The solder wire is not very hard, but has good ductility, meaning the softer it is, the higher the purity! More experienced craftsmen can tell just by touching it. Generally, there isn't a huge difference in quality between solder wires, and it may not be immediately apparent to the naked eye. Therefore, it still requires the accumulation of experience for a definitive judgment.

Next comes welding; before welding, the iron's temperature should be properly adjusted, as either too high or too low cannot achieve proper soldering. The melting point varies depending on its quantity and composition, so it's essential to set the appropriate temperature for accurate detection!