How to distinguish between silver solder wire and tin-copper lead-free solder wire

Lead-free tin wires are generally divided into tin-copper-tin wires, so how to distinguish these two types of tin wires?

Due to the action of silver metal, silver-containing solder wire is stronger and stronger than tin-copper lead-free solder wire, and the solder joints are stronger. Secondly, conductivity is also an important indicator in solder joints. Silver is a very conductive metal, so silver-containing solder wire has better conductivity and thermal conductivity than tin-copper lead-free solder wire. These properties are unsurpassed by tin-copper lead-free tin wire.

The cost is different:

Due to the high price of silver metal, the cost of silver-containing solder wire is more expensive than tin-copper lead-free tin wire. This is the advantage of tin-copper lead-free tin wire. The higher the silver content in the silver-containing tin wire, the more expensive the cost.

Different gloss color of solder joints:

The gloss color of the solder joint affects the brightness and color of the appearance of the solder joint. Since silver metal is a matte metal, it is not a bright metal, so the luster of the solder joints of silver-containing solder wire is not bright, but is matte. The luster of tin-copper-lead-free tin wire shows a certain degree of brightness, and the appearance is better. This is also one of the advantages of tin-copper lead-free solder wire, but the gloss color of the solder joint does not represent the soldering performance of the solder joint itself.

Different melting points:

Because of the difference in metal alloys, their melting points are also different. The melting point of silver-containing solder wire is: 217 degrees, while the melting point of tin-copper lead-free solder wire is: 227 degrees. The difference is 10 degrees.