What method should be used to join copper to steel?

Joining copper to steel effectively requires a method that can create a strong bond while accommodating the differences in thermal expansion and material properties. Silver brazing is considered the most appropriate choice for this application due to a few key reasons.

First, silver brazing typically involves higher temperatures than soft soldering, which allows for a much stronger joint. The filler metal used in silver brazing usually has a melting point above that of soft solder, which ensures that the joint can withstand higher temperatures and pressures once completed.

Second, silver brazing produces a joint that is more resistant to corrosion and other environmental factors compared to other methods. When copper and steel are connected, they are subjected to differing oxidation rates and can cause galvanic corrosion if not treated correctly. Silver brazing utilizes a filler material that includes silver, offering enhanced durability and resistance.

Lastly, silver brazing fills gaps more effectively than soft solder, which is especially important when working with metals that have different thermal expansion properties, like copper and steel. This method helps avoid mechanical stress at the joint and is critical for maintaining the integrity of the connection over time.

While methods like welding, soft solder, and silicon bronze brazing may be effective in certain situations, they lack the specific advantages that silver brazing provides when