Title:
NARROW GAP BUTT WELDING METHOD OF FIXED TUBE
Document Type and Number:
Japanese Patent JP3166510
Kind Code:
B2
Abstract:
PURPOSE: To prevent generation of incomplete fusion by executing high speed rotating arc welding in first layer welding and build-up layer welding by specifying the rotating speed and rotating diameter of arc and executing welding in final layer welding by weaving a welding torch.
CONSTITUTION: Fixed tubes 1, 2 are subjected to narrow gap butt welding by gas metal arc welding. In first layer welding, a ceramic backing CB is abutted to the rear face of narrow gap 3. The high speed rotating arc welding of 20-100Hz arc rotating speed and 1-4mm arc rotating diameter is used. While the welding condition, for each welding position and each root gap, is selected from the optimum welding condition set in the range of 150-500A welding current and 50-300cm/min welding speed, peripheral downward welding is executed. In build-up layer welding, the arc welding diameter D is changed to 2-6mm, welding is executed in the range of 150-400A welding current and 20-120mm/min welding speed. In final layer welding, welding is executed in the range of 60-180A welding current and 7.5-30cm/min welding speed.
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Inventors:
Yuji Sugitani
Masatomo Murayama
Yukio Kobayashi
Masatomo Murayama
Yukio Kobayashi
Application Number:
JP24424894A
Publication Date:
May 14, 2001
Filing Date:
October 07, 1994
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
B23K9/173; B23K9/022; B23K9/028; B23K9/035; B23K9/095; B23K9/12; B23K9/127; (IPC1-7): B23K9/028
Domestic Patent References:
| JP4200975A | ||||
| JP5970474A | ||||
| JP59232671A | ||||
| JP63252671A | ||||
| JP270384A | ||||
| JP56141971A |
Attorney, Agent or Firm:
Shigeru Takano