Soldering

Soldering is a process of joining two metals by applying low melting point metal or alloy in the gap between the joining parts. The metal or alloy used for filling or joining is known as solder. The melting point of solder is less than 450°C. Solders are divided into two categories.

1. Soft solder is alloy of tin and lead.
2. Hard solder is alloy of copper and zinc.

Flux Used: Chlorides fluxes (zinc chloride, ammonium chloride, zinc ammonium chloride).

This joining process forms a weak joint.