Method for manufacturing a bundle of plates for a heat exchanger

A method for making a compact bundle of plates for a heat exchanger formed with a stack of plates delimiting between them at least two circuits for circulating two independent fluids, and including a central heat exchange portion provided with corrugations, the method comprising:

• machining each plate to reduce an initial thickness of each plate while making at at least one of a periphery of each plate and through-tubings at least one connecting shoe with a height greater than a thickness of each plate after machining;
• forming corrugations in a central portion of each plate;
• superposing the plates pairwise by positioning the shoes of the plates over each other;
• connecting the shoes in contact with the plates of each pair together through a weld bead;
• superposing the pairs of plates by positioning the shoes of the pairs of plates over each other;
• and
• connecting the shoes in contact with the pairs of plates through a sealed weld bead by arranging an alternating superposition of open or closed ends for inflow or outflow of said fluids.