When the pipe elbows are brazed in the vertical pipes of heat exchangers (shown here using a copper heat exchanger as an example), the individual pipe elbows, which were previously coated with self-flowing filler-metal rings and inserted into the swaged vertical pipes, are brazed in within around 6 sec. using an oval inductor. The coaxial transformer with inductor is fastened on a robotic arm and traces every pipe elbow of the heat exchanger.
The pipe elbows of heat exchangers can be brazed rationally using HF generators such as the eldec HFG 10 igbt. Pyrometric control of the generator power is used here in order to prevent the pipe elbows from melting through (this is easily possible due to different degrees of contact with the vertical pipe, advancing heat, varying melting behavior of the filler-metal rings, etc). The generator thus approaches the setpoint temperature at high power and stays there for a stipulated remaining time until the filler metal flows and binds completely.
Thanks to the generator’s compact size, it can be fastened directly to the robot and requires no additional space.