Patent ID: 7748427

Claim:
A fusion welding device, comprising: a first holder, having a first face, and adapted to hold at least an outer peripheral face of an end portion of a first work in a state where the first work is movable in a longitudinal direction thereof; a second holder, having a second face opposed to the first face, and adapted to hold at least an outer peripheral face of an end portion of a second work in a state where the second work is movable in a longitudinal direction thereof; a heater, operable to heat the first work and the second work; a first mover and a second mover, adapted to move the first holder and the second holder in such directions that the first face and the second face come close to or apart from each other; a third mover, adapted to move the first holder and the second holder in synchronization with each other in a direction along the first face and the second face; and fourth mover, wherein: the first holder and the second holder are moved by the third mover in a state where the first face and the second face are in contact with each other, whereby end faces of the end portions of the first and second works are pressed to each other in the longitudinal directions thereof in the first and second holders, the heater has a third face and a fourth face, when the heater is disposed in a first position, the third face can be contacted with the first face of the first holder and the fourth face can be contacted with the second face of the second holder, when the heater is disposed in a second position, the third face cannot be contacted with the first face and the fourth face cannot be contacted with the second face, the fourth mover moves the heater between the first position and the second position, and when the first and second holders are moved by the third mover, the heater is moved together with the first and second holders, the first holder, the second holder, the heater, the first mover, the second mover, and the fourth mover are provided on a moving body, and the third mover includes a base member and the moving body mounted on the base member so as to move in the direction along the first face and the second face, the first holder has a first holding space in which the first work is movable, the second holder has a second holding space in which the second work is movable, and when the first holder and the second holder are moved by the third mover, the first holder and the second holder hold the first work and the second work such that the first and second faces of the first and second holders and the end faces of the end portions of the first and second works are continued to be flush with each other respectively.