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 to form 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 machined plate;
• superposing the corrugated plates pairwise by positioning the shoes of the corrugated plates over and in contact with each other;
• connecting the contacting superposed shoes of the corrugated plates of each pair together through a weld bead;
• superposing the welded pairs of corrugated plates by positioning the shoes of the welded pairs of corrugated plates over and in contact with each other;
• and
• connecting the contacting superposed shoes of the welded pairs of corrugated plates through a sealed weld bead by arranging an alternating superposition of open or closed ends for inflow or outflow of said fluids.