Title:
【発明の名称】チタンまたはチタン合金溶接管の製法
Document Type and Number:
Japanese Patent JP3352960
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To perform a high-speed pipe manufacturing while keeping a sound welding condition by melting a pipe to the pipe inner face with plasma arc at an electrode at the tip to form an inner face bead, and forming a molten pool which does not reach the pipe inner face with low energy arc at the following electrode to perform the shape correction of a surface bead. SOLUTION: When a plasma electrode with a high welding performance is used for a preceding electrode, a problem that an undercut A formed on a preceding bead surface becomes significant can not be avoided. Therefore, a molten pool P with a crown-like cross sectional shape is formed, and a degree of the undercut A becomes significant as the thickness of the pipe gets bigger. Then, a plasma arc is used as a following electrode for melting a bend outer face only, without penetrating to the inner face side, so as to smoothen the outer face bead by correcting the undercut A formed to the preceding bead. Thereby, the following correction welding or grinding become unnecessary. And even in case of a titanium or titanium alloy welding pipe, a pipe can be manufactured at high speed without generating micro cracks.
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Inventors:
Atsushi Miyamoto
Eiichi Suzuki
Eiichi Suzuki
Application Number:
JP33152698A
Publication Date:
December 03, 2002
Filing Date:
November 20, 1998
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
Shinko Special Steel Pipe Co., Ltd.
Shinko Special Steel Pipe Co., Ltd.
International Classes:
B23K9/167; B21C37/08; B23K9/095; B23K10/00; B23K10/02; B23K28/02; B23K103/14; (IPC1-7): B23K10/00; B21C37/08; B23K9/095; B23K9/167; B23K10/02; B23K28/02
Domestic Patent References:
| JP4305375A | ||||
| JP61286074A | ||||
| JP6320277A |
Attorney, Agent or Firm:
Etsushi Kotani (1 person outside)