A well known situation: The first joint when using plate heat exchangers is to braze a copper fitting into the stainless steel socket. While brazing copper on copper with an oxy-acetylene or oxy-propane flame is easily learned, this is much more tricky, as soon as there is stainless steel on one side of the joint.

A real bad heat transfer coefficient and a sensitive surface are what makes brazing a challenge. Penetration Depth Induction using a ring or hook-shaped inductor enable to reach brazing temperature fast and with nearly no overtemperature at the surface. By the way, purely time-controlled, no need for actual temperature regulation. As brazing material, wired metal rings with high silver contents are used. T ...