Title:
PRODUCTION OF SPIRAL STEEL TUBE
Document Type and Number:
Japanese Patent JP3233049
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a product having accurate welding beads on its internal and external faces in high speed welding for producing a tube with only submerged arc welding by making the length of projection more than a specific dimension and welding while inserting a non-arc spot arc wire in a molten pool on the rear side of the welding wire.
SOLUTION: A torch 2 is fixed and arranged, and a material 1 to be welded is moved in the direction of arrow mark. When the projection length L of a welding wire is set more than 50mm and welding is executed, the temperature of a molten metal pool is reduced and the length of the molten pool is shortened. As a result, because the flow of molten metal to the central part of the length direction of the molten pool is restricted in the time of welding on the internal face, a small depth of welding bead is formed. Further, at the time of welding on the external face, the molten metal flow to both ends of the length direction of the molten pool is restricted, a small height welding bead is formed. The heat of the molten metal in the molten pool 7 is consumed to melt an inserted non-arc spot arc wire 8, the temperature is reduced and the length of the molten pool is shortened.
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Inventors:
Yoji Inaba
Takayuki Kubo
Takayuki Kubo
Application Number:
JP31024396A
Publication Date:
November 26, 2001
Filing Date:
November 21, 1996
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B23K9/18; B21C37/12; B23K9/032; B23K9/12; (IPC1-7): B23K9/032; B21C37/12; B23K9/12; B23K9/18
Domestic Patent References:
| JP4284975A | ||||
| JP4143075A | ||||
| JP9295138A | ||||
| JP54155166A | ||||
| JP60118386A |
Attorney, Agent or Firm:
Morio Mori (1 outside)