A process for preparing a compound of pipes and pipe connection created by the process

The invention relates to a process for the preparation of a compound (1) of pipes (2) and (3) in particular for a pipeline (4) of a heat pump unit of a household appliance such as a clothes dryer, dishwasher or a laundry dryer, wherein the end of a first tube (2) wherein the sealing compound (1) of the pipes (2) and (3) is carried out soldering of the joint is widened and the end of the second tube (3) is inserted into the widened section (5). To provide a process-safe pipe joint, the widening (5) at the free end of the first tube (2) is divided into two sections (6) and (7).