| 摘要 |
A manufacturing process of a heat-exchange assembly of a water heater bottom cover is disclosed. The process comprises the following steps: after blanking, the bottom cover (1) and a bottom cap (2) are stretched respectively, each of which is composed of a spherical surface and a cylindrical section; vitreous enamel is painted on the surfaces of said bottom cover other than the inner surface of its cylindrical section and the convex surface of the bottom cap other than the outer surface of its cylindrical section, and the vitreous enamel is sintered and cured; the bottom cover is put onto the bottom cap, until the inner surface of the cylindrical section of the bottom cover completely and closely contacts with the outer surface of the cylindrical section of the bottom cap; and fillet welding is performed along the edge of the bottom cap's cylindrical section which is pressed on the bottom cover's cylindrical section, to make the bottom cover and the bottom cap form the heat-exchange assembly of the bottom cover with a heat exchange cavity. A special tooling used for the process is further disclosed. The process may make the heat-exchange assembly of the bottom cover have high strength and rigidity and have excellent air-tightness and corrosion resistance.
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