METHOD FOR MANUFACTURING CORROSION RESISTANT HEAT EXCHANGER

PROBLEM TO BE SOLVED: To provide a method for manufacturing an inexpensive, highly corrosion resistant heat exchanger formed of stainless steel. SOLUTION: A chromium brazing filler metal layer 21 is formed after applying the Cr electroplating of a plating thickness of 15 μm on both end faces of firs...

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Bibliographische Detailangaben
Hauptverfasser:	MAEDA AKIHIRO, OBAYASHI SHINKICHI, KAJIKAWA SHUNJI, SAKAMOTO ZENJI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLADDING OR PLATING BY SOLDERING OR WELDING COMBUSTION ENGINES CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION HEAT EXCHANGE IN GENERAL HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINE TOOLS MECHANICAL ENGINEERING METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS SOLDERING OR UNSOLDERING SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF TRANSPORTING WEAPONS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing an inexpensive, highly corrosion resistant heat exchanger formed of stainless steel. SOLUTION: A chromium brazing filler metal layer 21 is formed after applying the Cr electroplating of a plating thickness of 15 μm on both end faces of first and second forming stainless steel plates 1 and 2 alternately stacked on each other in the thickness direction, and then a nickel brazing filler metal layer 22 is formed after applying the Ni-P plating of a plating thickness of 35 μm on the chromium brazing filler metal layer 21. The highly corrosion resistant heat exchanger is manufactured by applying the integral brazing with the chromium brazing filler metal layer 21 and the nickel brazing filler metal layer 22 interposed between the first and second forming plates 1 and 2. A highly corrosion resistant brazing filler metal 31 having an alloy composition consisting of Ni-Cr28-P8, etc., is obtained on both end faces of the first and second forming plates 1 and 2. A fine metal structure in the highly corrosion resistant brazing filler metal 31 can be realized, and generation of cracks in the interface of the metal structure can be reduced.