Heat exchanger and method of assembly thereof

Details Heat exchanger and method of assembly thereof Heat exchanger and method of assembly thereof

B - Operations, Transporting

23

K

B23K 9/028 (2006.01) B23P 15/26 (2006.01) F28D 1/02 (2006.01) F28F 1/02 (2006.01) F28F 9/02 (2006.01) F28F 9/18 (2006.01)

Patent

CA 2060247

A method of affixing a plurality of tubes having oval ends into a plurality of corresponding oval openings in the header wall of a heat exchanger in which the wall has an inner, liquid-facing side and an outer, air-facing side. The oval ends of the tubes are sized such that the minor diameter of the tube ends is greater than the minor diameter of the header openings and the major diameter of the tube ends is less than the major diameter of the header openings, the circumference of the tube ends and the header openings being substantially equal. The tube ends are inserted into corresponding openings in the header wall whereupon the minor diameter of the tube ends is reduced and the major diameter of the tube ends is increased to create a substantially fully contacting fit around the circumference with said header openings. Ends of the tubes are welded to corresponding collar openings in the header wall, such that the tubes extend toward the air-facing side of the wall, to form a plurality of welded tube-to-header joints. Flux is applied by spraying or the like to the air-facing side of the tube-to-header joints. Thereafter, a lead/tin or other molten solder is applied to the liquid-facing side of the tube-to-header joint by dipping or wave solder techniques and flowed into any voids in the welded joints to substantially seal the joints against leakage of liquid. Only those joints having potential liquid leaking voids receive the solder - sound, liquid-tight welded joints axe not solder sealed.

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