Method for producing a steel pipe using a high density energy be

Details Method for producing a steel pipe using a high density energy be Method for producing a steel pipe using a high density energy be

1996-04-25

1999-05-04

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Producing or treating layered, bonded, welded, or...

148520, 148524, 148525, 21912164, B23K 2600

Patent

active

059000791

ABSTRACT:
A method of producing a welded steel pipe which comprises: (a) forming a steel strip having two edges in a cylindrical form so that the two edges face each other; (b) preheating the two edges of the steel strip to a temperature of a melting point or less by applying a high frequency electric current to the two edges; (c) pressing the two edges of the steel strip towards each other by contact with squeeze rolls to form a joint portion including a joint line; (d) radiating a high density energy beam sufficient to fuse a full thickness of the steel strip to a portion adjacent to a squeeze point to weld the joint portion; and (e) controlling an upset by applying the squeeze rolls sufficiently to reduce weld defects.

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Y. Inaba et al, "The Present Status and Applications of Laser Processing: A Hybrid Manufacturing Process for Laser Welding of Stainless Steel Pipes", vol. 7, No. 6, Jan. 1, 1993, pp. 487-492.
Patent Abstracts of Japan, vol. 016, No. 129 (M-1228), Apr. 2, 1992 of JP-A-03-291176 (Sumitomo Metal Ind. Ltd.), Dec. 20, 1991.
Patent Abstracts of Japan, vol. 00.8, No. 216 (M-329), Oct. 3, 1984 of JP-A-59-101293 (Sumitomo Kinzoku Kogyo KK), Jun. 11, 1984.
Patent Abstracts of Japan, vol. 007, No. 092 (M-208), Apr. 12, 1983 of JP-A-58-016781 (Sumitomo Kinzoku Kogyo KK), Jan. 31, 1983.

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