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Title:
WELDING METHOD
Document Type and Number:
Japanese Patent JPS59232690
Kind Code:
A
Abstract:

PURPOSE: To perform welding with high quality without reinforcement of weld and lack of penetration in the stage of welding circular shaped members such as pipes by welding simultaneously the joint part of both members with a heat source of high energy density such as laser from the outside circumferential side of said part and with an arc heat source from the inside circumferential side.

CONSTITUTION: A high energy density beam such as a laser beam or electron beam is irradiated via a beam bender 4 and a condenser lens 5 to the butt joint part of pipes 1a, 1b from the outside circumferential side of said part to form a weld zone 7 except about 2mm unwelded part on the inside circumferential side in the stage of butting and welding the pipes at the end faces. A weld zone 8 is formed at the same time with a TIG welding torch 6 from the inside circumferential side of the joint part so as to overlap on the unwelded part and about 1mm welded part 7. Welding is performed in this case by rotating the pipes 1a, 1b around the central axis while holding the laser and the torch 6 immobile. The weld zone which is free from reinforcement of weld and lack of penetration on the inside circumferential side and does not require finish working is formed.


Inventors:
SUGIYAMA SADAO
NAKAYAMA KAZUO
SANO NAOTO
Application Number:
JP10906083A
Publication Date:
December 27, 1984
Filing Date:
June 17, 1983
Export Citation:
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Assignee:
TOSHIBA KK
International Classes:
B23K9/028; B23K9/00; B23K26/21; B23K26/346; B23K28/02; (IPC1-7): B23K31/06; B23K9/02
Attorney, Agent or Firm:
Kiyoshi Inomata



 
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