CD welding, joining non-ferrous metals
The steel/brass connection shown has proven its worth for decades and is exemplary for many other connections of this type. It is employed in valve construction, e.g. with the connection of radiators. Due to the differences in the melting temperature and the electrical and thermal conductivity, these welds can only be produced with pressure welding processes, in particular CD welding processes. This example stands for many applications in the welding of non-ferrous metals.
The resistance welding of sintered materials is initially uncritical. The material has good electrical or thermal conductivity and the characteristics of powder metals can be adapted in subsequent processing steps. Difficulties arise if application-specific additives are admixed. The classic connection process used here is hard soldering. However, this is associated with significant disadvantages. Production is complex, it requires the addition of costly solder and in individual cases high heat and poor cooling can unsolder the segment and it may drop out again. CD welding delivers durability and temperature resistance here at the level of the basic material.