Welded can and process for preparation thereof
US4409456A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1981 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Mar 5, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12847
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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-tre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.