Hard Soldering an Alternative to Brazing

Hard soldering (silver soldering) is an alternative to brazing. It specially implies the use of the filler materials containing silver, which have lower melting point than brazing spelter and therefore associated with greater ductility and often greater strength. Hard soldering is general term used to cover brazing and silver soldering. However, hard soldering can be defined as an intermediate stage between low temperature soft soldering and high temperature brazing. The operation of brazing and hard soldering are almost identical and the two terms are used synonymously. Hard soldering normally means…

Read More

Brazing and Its Applications

Brazing is defined as a process of joining similar or dissimilar metals in which molten filler metal is drawn by capillary action into the space between closely adjacent surfaces of the parts to be joined. In general, the melting point of the filler metal lies above 5000C but below the melting point of the parent metals being joined. The brazing alloy is often called spelter and can be plain brass (50% copper and 50% zinc). Increasing of the zinc content decreases the melting point of the spelter. Borax is used as a…

Read More