Methods for manufacturing tubes filled with powdery and granular

Details Methods for manufacturing tubes filled with powdery and granular Methods for manufacturing tubes filled with powdery and granular

1993-09-23

1995-12-12

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making articles of indefinite length

419 8, 419 67, 228158, B22F 500

Patent

active

054747368

ABSTRACT:
A method for manufacturing tubes filled with powdery and/or granular substances comprising the steps of forming a metal strip into a tube, feeding powdery and/or granular substances into the tube being formed as a core, joining together the edges of the tube filled with the core of the powdery and/or granular substances by high-frequency welding, and reducing the diameter of the welded tube filled with the core of the powdery and/or granular substances. At least the top layer of the core in the tube is composed of powdery and/or granular substances having low enough magnetic susceptibility to remain unattracted to the magnetized tube edges that is determined based on the welding heat input.

REFERENCES:
patent: 4629110 (1986-12-01), Holmgren
patent: 4632882 (1986-12-01), Werner et al.
patent: 5192016 (1993-03-01), Araki et al.
Patent Abstracts of Japan, vol. 10, No. 100 (M-470) Apr. 16, 1986.
Patent Abstracts of Japan, vol. 11, No. 39 (M-559) Feb. 5, 1987.

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