The melting point of solder wire is 183 degrees. When the tin content is higher than 63%, the melting temperature increases and the strength decreases. When the tin content is less than 10%, the welding strength is poor, the joint becomes brittle, and the lubricating ability of the solder becomes poor. The most ideal is eutectic solder. At the eutectic temperature, the solder changes directly from a solid to a liquid without going through a semi-liquid state.

The melting temperature of eutectic solder is lower than that of non-eutectic solder, which reduces the chance of damage to the components being soldered. At the same time, since the eutectic solder changes directly from liquid to solid, the phenomenon of virtual soldering is also reduced. Generally, the melting point of lead-free solder wire is relatively high, around 227C, and the melting point of solder wire with different solder materials will not vary greatly, so before using solder wire, first understand how high the temperature your solder can bear. Then choose lead-free solder wire with suitable solder melting point. Several specifications of lead-free solder wires commonly used in the market and their solder melting points.

Melting point of lead solder wire:

(1) The melting point of 63/37 solder wire is 183°C

(2) The melting point of 60/40 solder wire is 185°C-190°C

(3) The melting point of 55/45 solder wire is 187°C-202°C

(4) The melting point of 50/50 solder wire is 190°C-216°C

(5) The melting point of 45/55 solder wire is 192°C-227°C

(6) The melting point of 40/60 solder wire is 194°C-238°C

(7) The melting point of 35/65 solder wire is 198°C-247°C

(8) The melting point of 30/70 solder wire is 202°C-256°C