B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/40
B23K 9/02 (2006.01) B23K 9/025 (2006.01) H01F 13/00 (2006.01)
Patent
CA 1083228
ABSTRACT OF THE DISCLOSURE An improvement is provided in longitudinally seam-welding a pipe- blank for welded steel pipe from the inside along a groove by the arc welding process. Such process includes attaching a tab plate to at least a terminal end of the pipe-blank, supplying a direct electric current for welding to a consumable electrode through a cable, and moving the consumable electrode from a first end of the pipe-blank to the terminal end of the pipe-blank while effecting seam-welding. A method is provided for eliminating a residual magnetism in the pipe-blank produced by the direct electric current for welding flowing through the cable introduced into the pipe-blank, such method com- prising: reversing the polarity of the consumable electrode to a polarity opposite to that used for the longitudinal seam-welding, when the consumable electrode is adjacent the tab plate at the terminal end of the pipe-blank sub- jected to the longitudinal seam-welding for causing a direct electric current for eliminating magnetism to flow through the cable in the opposite direction to that of the direct electric current for welding, thereby eliminating the residual magnetism in the pipe-blank produced by the direct electric current for welding flowing through the cable introduced into the pipe-blank during the longitudinal seam-welding. The weld thus provided is sound and sub- stantially free from welding defects.
274581
Hirano Osamu
Kojima Toshifumi
Koshiga Fusao
Matsubara Hiroyoshi
Nagamine Takashi
Marcus & Associates
Nippon Kokan Kabushiki Kaisha
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