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Elpatronic Ag

Jurg Opprecht

Paul Opprecht

Werner Urech

A method of fabricating a projection for resistance welding contemplates fabricating the projection at the workpiece by plastic deformation of the basic material and dimensionally exactly shaping the projection by compression molding of the flowable metal between a punch and die of a tool.

Method of fabricating a projection for resistance welding

A can body is rolled from a sheet-metal blank (28) and has outer and inner longitudinal edges (12 and 14 respectively) which are welded to one another in an overlapping manner. Extending round the can body transversely to the longitudinal edges (12, 14) are two circumferential scorings (16) which define a tearing strip (18) laterally. The tearing strip (18) is extended by a tongue (20) which is welded onto the outer longitudinal edge (12) and which can be gripped by a key and rolled up. In a welding zone (42) which is adjacent to a starting scoring (30), the tearing strip (18) is stiffened by the welded-on tongue (20) in such a manner that it tears away from the can body reliably along the circumferential scorings (16) during the rolling up of the tongue (20).

Openable can body

A projection for use in electrical resistance welding of sheet metals and thin-wall parts, a method of fabricating such projection and the use of the same are disclosed. The flanks of the projection possess internally thereof an angle of about 40.degree. to 75.degree. and externally an angle of about 40.degree. to 100.degree., and the strength of the material at the region of the flanks is about 50% greater than the strength of the neighboring basic material. The method of forming the projection contemplates fabricating the same through plastic deformation of the basic material and the dimensionally exact shaping is accomplished by compression molding of the flowable metal between a punch and die of a tool.

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Widen, Switzerland

Jurg Opprecht