Brazing a heat exchanger with a moving brazing tool

A method of manufacturing at least one brazed heat exchanger, comprising the steps of:

• a. providing components for a heat exchanger and providing a core builder machine comprising a table and a brazing tool arrangement;
• b. assembling the heat exchanger components to form at least one unbrazed heat exchanger core on the table of the core builder machine;
• c. moving the brazing tool arrangement relative to the table such that the brazing tool arrangement forms a chamber on the table that at least partially encloses the at least one heat exchanger core on the table of the core builder machine, the brazing tool arrangement comprising means to heat the interior of the chamber, wherein moving the brazing tool arrangement comprises advancing opposing headers or opposing side plates towards the at least one heat exchanger core on the table and lowering a top plate towards the table such that the headers or side plates and the top plate together form the chamber on the table;
• d. optionally, at least partially evacuating the chamber and/or at least partially filling the chamber with an inert and/or a reactive gas;
• e. brazing the at least one heat exchanger core in the chamber to form the at least one brazed heat exchanger on the table of the core builder machine.