Method for automatic multi-layer welding.

摘要

In automatic multi-run welding of a butt joint (37), for example a V-type joint, U-type joint, a sensor (44) oscillating transverse to the weld joint scans at several joint portions (F1, F2) a number of points (41, 41a, 41b etc.) on the contour of the joint. The coordinates of the points are determined for two directions, preferably in the vertical direction and lateral direction of the joint. The points are corner points of a polygon whose area is nearly identical to the cross-sectional area of the joint. Welding parameters, for example the welding speed, which control the amount of welding material per unit of length in a bead to be deposited in the joint are determined for the different joint portions (F1, F2) as a function of the corresponding polygon area. By virtue of the adaptation of the parameters to the varying joint cross-section, the joint is filled uniformly despite deviations in the shape of the joint from the ideal shape. Moreover, these polygon areas are used to determine the required number of beads per layer and the condition for deposition of a top layer with which the welding is finished.