Welded can and process for preparation thereof

Details Welded can and process for preparation thereof Welded can and process for preparation thereof

1981-03-05

1983-10-11

Lewis, Michael L.

Electric heating

Metal heating

Of cylinders

219 83, B23K 116, B23K 1130

Patent

active

044094566

ABSTRACT:
Disclosed is a process for the preparation of welded cans, which comprises forming a blank comprised of a surface-treated steel plate 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 surface-treated steel plate comprises a layer of metallic tin or a tin-iron alloy formed on the steel plate substrate in an amount of 0.05 to 1.0 g/m.sup.2 as calculated as metallic tin and a hydrated chromium oxide layer formed on said tin layer in an amount of 0.005 to 0.05 g/m.sup.2 as calculated as metallic chromium and electric resistance welding is carried out in an inert atmosphere in the state where an electrode wire having a plating layer of tin or a tin alloy having a thickness of 0.1 to 20 .mu.m is kept in close contact with the surface of said surface-treated steel plate.
In the inner and outer surface portions of the side seam of a welded can prepared according to this process, the thickness of the oxide layer is controlled below 400 A and the amount of tin in these inner and outer surface portions is at least 60% of the amount of tin in the starting surface-treated steel plate, and this welded can is excellent in the corrosion resistance, lacquer adhesion and appearance characteristics of the seam.

REFERENCES:
patent: 3978803 (1976-09-01), Asano et al.
patent: 4282981 (1981-08-01), Kitamura et al.
patent: 4334138 (1982-06-01), Matsuno et al.
Silman, H., et al., Protective and Decorative Coatings for Metals, p. 556, (1978).
Lyman, T., et al., Metals Handbook, 8th edition, vol. 2, p. 547, vol. 6, pp. 83 to 86.

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