B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 26/02 (2006.01) B23K 26/26 (2006.01) G02B 6/44 (2006.01)
Patent
CA 2046623
- 43 - A B S T R A C T An apparatus for manufacturing a metal tube covered optical fiber cable, comprises an assembly (2) consisting of a plurality of roller pairs for forming a metal strip (1) subjected to traction and causing both side edges of the metal strip to abut against each other to form a metal tube, a laser welding means (7) for radiating a laser beam on abutment portions of the metal tube to bond the abutment portions, thereby obtaining a sealed metal tube (1c), and an optical fiber guide means (6) for guiding an optical fiber (5) into the formed metal tube (1a), wherein the laser welding means (7) determines a focal point shift amount so that a rear bead width determined by an outer diameter and a wall thickness of the metal tube falls within a predetermined range, and laser welding is performed at a welding rate corresponding to the determined focal point shift amount.
Takashi Tsukui
Yasunori Yoshie
Nkk Corporation
Ridout & Maybee Llp
Takashi Tsukui
Yasunori Yoshie
LandOfFree
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