Why can’t you solder copper parts with steel solder?

When brazing, it is important that the melting point of the solder is lower than the melting point of the parts. The melting point of steel is higher than the melting point of copper, so if you try to solder copper parts to each other with steel solder, the parts to be joined in contact with such solder will melt themselves at the soldering points.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.