| 摘要 |
PURPOSE:To provide a copying device which is simple in constitution and hardly receives thermal influence by detecting the surface to be welded in a saddle-shaped part by means of a sensor which moves on the surface of the pipe on the vertical side and a sensor which is disposed in the pipe on the horizontal side and moves in the direction perpendicular to the diametral direction of the pipe on the horizontal side. CONSTITUTION:The 1st sensor 3 of a non-contact type which copies the circumferential surface of a pipe 1 on a vertical side determines the extent Z of the forward and backward movement of a torch 5 with respect to the surface of the pipe 1 and the 2nd sensor 4 disposed within a pipe 2 on a horizontal side moves in the diametral direction of the pipe 1 orthogonally with the straight pipe axis of the pipe 2. The extent X of the horizontal movement in the diametral direction of the pipe 1 is determined by the rotating angle theta of the torch 5 from X=rsin theta (r: the radius of the pipe 1). The extent Y of the vertical movement of the torch 5 with respect to the surface to be welded is determined by the extent Y of the vertical movement in the stage of copying the inside surface of the pipe 2 when the 2nd sensor 2 of a contact or non-contact type moves in the above-mentioned diametral direction. The copying device which is hardly affected by heat is thus obtd. with the simple constitution. |
