Butt-welded cans and process for manufacturing the same

Details Butt-welded cans and process for manufacturing the same Butt-welded cans and process for manufacturing the same

1988-09-02

1989-06-20

Godici, Nicholas P.

Metal fusion bonding

Process

With protecting of work or filler or applying flux

228151, 228196, 228118, 219 64, 21912164, 220454, 220DIG29, B23K 2600, B23K 2616

Patent

active

048403040

ABSTRACT:
A process for manufacturing the butt-welded cans comprises the steps of applying a 0.5 to 3.5 .mu.m thick organic resin film for preventing the adhesion of melted metal particles to at least a 1-mm-wide region from the butt-weld portion edge of at least the inner surface of a steel plate can blank, and butt-welding the edges of the can blank by the use of a laser, or alternatively applying a 0.5 to 7.0.mu.m thick organic resin film, butting the edges of the can blank, and laser-welding the butted edges while a cooling device is brought into contact with the butted edges from the inner side of each can. In this case, it is preferred that the coating material having high thermal decomposition resistance is applied to the whole outer surface of each can, and the weld portion is then butt-welded by means of a CO.sub.2 laser. The aforesaid coating material have the high resistance to thermal decomposition and is the material in which the temperature at which a thermogravimetric weight reduction ratio of the coating material reaches 50% is 470.degree. C. or more, i.e., the coating material comprising a phenolic resin or fluoride resin, or a coating material containing a polyorganosiloxane, metallic oxide or metallic powder.

REFERENCES:
patent: 4023005 (1977-05-01), Bolin
patent: 4574176 (1986-03-01), Sharp
patent: 4719329 (1988-01-01), Matsuno et al.

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