| 摘要 |
A tube seat, which is made of titanium alloy, for fabricating a frame of a bicycle include a main tube and at least a branch tube extending outward from said main tube. The branch tube is arc-welded with a metal tube made of titanium alloy firmly. The tube seat is fabricated as an upper tube seat, a five-way tube seat, a head tube seat, a hook tube seat, a crank arm seat, and a fork seat. The metal tube is fabricated as seat tube, a top tube, a seat stay, a down tube, a chain stay, a crank arm, and a fork for forming the frame.
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