JPS5781973A - Welding device for pipe - Google Patents

Abstract

PURPOSE: To make oscillating motion of a welding torch and arc length control simple and reduce weight by employing a welding and holding mechanism which runs a welding torch by utilizing the flange face of a pipe to be welded and utilizes parallel link mechanisms.

CONSTITUTION: A traveling carriage 27 having a welding torch 16 and a connecting base 12 are placed on the end face of a flange 100a of a pipe 100 by means of guide rollers 25 and the like, and the carriage 27 is moved in an X direction. Next, in this state, a driving roller 3 is brought in press-contact with the outside circumferential surface of the flange 100a by means of tension springs 8, 108. The inside and outside circumferential surfaces of the pipe 100 are grasped under pressure by guide rollers 24, 124 in press-contact with the inside circumferential surface of the pipe 100 and in accordance with the revolution of the roller 3, the carriage 27 is turned in a prescribed direction. Next, a motor 2 is driven to move a support plate 23 upward or downward until the leading end of the torch 16 is aligned to a weld line 150. Thereafter, with fulcrum shafts 32, 33 as fulcrums, the link 17 holding the torch 16 is oscillated by a link 18 at a prescribed angle; at the same time, the leading end part of the torch 16 is oscillated in the range of prescribed angles, whereby the oscillation motion of the torch 16 is accomplished.

COPYRIGHT: (C)1982,JPO&Japio