Electric heating – Metal heating – Of cylinders
Patent
1981-03-05
1983-08-30
Goldberg, Elliot A.
Electric heating
Metal heating
Of cylinders
219 84, 219118, B23K 1132
Patent
active
044018746
ABSTRACT:
Disclosed is a process for the preparation of welded cans, which comprises forming a blank into a cylinder and passing a lap portion of the formed cylinder between a pair of electrode rollers through an electrode wire to effect electric resistance welding, wherein said blank is a tin-free steel blank comprising a steel plate substrate, a layer of metallic chromium formed on the surface of the steel plate substrate and a layer of chromium oxide formed on the metallic chromium layer, and electric resistance welding is carried out in an inert atmosphere in the state where an electrode wire having a plated layer of a soft metal selected from the group consisting of tin and alloys thereof, the thickness of said plated layer being 0.1 to 20 .mu.m, is kept in close contact with the chromium oxide layer of the tin-free steel blank.
The inner and outer surfaces of the side seam of a welded can according to this process are covered with a continuous or discontinuous protecting covered layer including a metallic chromium layer and a chromium oxide layer formed thereon, and the thickness of steel oxide exposed through this discontinuous portion is controlled below 400 A. Since exposure of steel in the inner and outer surfaces of the seam is thus controlled, the corrosion resistance, lacquer adhesion and appearance charcteristics of the seam are highly improved in this welded can.
REFERENCES:
patent: 3978803 (1976-02-01), Asano et al.
patent: 4282981 (1981-04-01), Kitamura et al.
patent: 4334138 (1982-06-01), Matsuno
Silamn et al., "Protective and Decorative Coarings for Metals," p. 556 (1978).
Lyman et al., "Metals Handbook," 8th Edition, vol. 2, p. 547; vol. 6, pp. 83-86.
Ito Makoto
Kitamura Yoichi
Yurita Chikara
Goldberg Elliot A.
Toyo Seikan Kaisha Ltd.
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